Tag: Education

Educational Learning Center

Modern HVAC control solutions supporting a centralized administrative and educational hub for one of British Columbia’s largest school districts.

Location Coquitlam, British Columbia

Date of Completion 2021

Representative Riada Sales Inc

Griswold Controls Products Used CPP-2 PIC-V, CPP-2 IRIS w/ Automatic Flow Limiting Valves, CPP-2 IRIS w/ 3-Way Unimizer Actuated Valves

Photo from School District No. 43

Facility Description

Coquitlam is the 6th largest city in the province of British Columbia. Located just outside Vancouver while maintaining an abundance of parks and natural green spaces, it is easy to understand why the area continues to grow in popularity.

Serving more than 35,000 students and staff, the local school district required an updated administrative hub that could improve collaboration and operational efficiency. The solution was the construction of the new Educational Learning Center, designed to consolidate administrative and educational functions into a single location.

Previously, these responsibilities were spread across five different buildings throughout the district. Many of those facilities were not suited to their roles, with limitations such as inaccessible areas, inefficient workspace layouts, and inadequate parking. The new facility provides a modern environment designed to support staff collaboration and district-wide operations.

Project Description

The Educational Learning Center was designed with both functionality and user experience in mind. Architects and engineers prioritized intuitive building design alongside reliable HVAC performance to ensure comfortable working conditions throughout the facility.

To support this goal, the project incorporated Griswold Controls Coil Piping Packages. These systems arrive pre-assembled and ready to ship within 48 hours, helping reduce installation time and overall project costs.

Products Used

Coil Piping Packages

This project utilized several Griswold Controls solutions including Pressure Independent Valves, Automatic Flow Limiting Valves, and Unimizer Actuated Valves. These components work together to provide accurate flow control and dependable HVAC system performance.

The CPP-2 PIC-V configuration ensures pressure independent flow regulation, maintaining consistent performance even when system pressure conditions fluctuate.

CPP-2 IRIS packages with Automatic Flow Limiting Valves provide precise flow balancing and reliable system stability, while configurations with 3-Way Unimizer Actuated Valves allow efficient control of heating and cooling loads throughout the building.

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About Riada Sales Inc.

Since 1995, Riada Sales Inc. has helped engineers, contractors, architects, and building owners select and specify the right products for commercial, institutional, and multi-family residential projects.

Riada specializes in product selection, engineering support, and technical expertise while standing firmly behind the manufacturers they represent. Their team is dedicated to delivering reliable solutions and exceptional service on every project.

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Wester Middle School

Comfort and reliability supporting the next generation of learners in Frisco, Texas.

Location Frisco, Texas

Date of Completion 2021

Representative Texas AirSystems

Griswold Controls Products Used CPP-2IRIS Coil Piping Package

Facility Description

Wester Middle School serves not only as a school, but a place to nurture the growth and development of the young minds in Frisco, Texas. As you may know, Texas has a warm climate most of the year. Because of this, they do not mess around when it comes to HVAC. They chose the best.

Like most middle schools, Wester hosts regular plays, concerts, and sporting events. Unlike most middle schools, they offer many different clubs that students can participate in, the teachers are very involved in the students’ lives, and they believe that our kids deserve the best because they are the next generation; making their safety and comfort their utmost concern.

Project Description

The administration at Wester Middle School has made sure they uphold those two values when it comes to HVAC by choosing Griswold Controls to outfit the entire building with CPP-2IRIS Coil Piping Packages all around.

For this particular project, the customer supplied the control valves and we installed them. This is something that we are more than happy to do. The package includes 3 control valves, Griswold Controls combination automatic flow limiting Isolator R valves with Combination strainer Isolator S valves. All of the valves, housings, and seals are made of forged brass to ensure reliability and optimal performance. The valves can be easily serviced, inspected, or modified without disturbing any piping connections whatsoever. With all parts being rated to withstand 250°F and some able to withstand 1000 PSI, the CPP-2IRIS Coil Piping Package proves a worthy choice for schools, even on a sweltering Texas summer day.

Products Used

CPP-2IRIS Coil Piping Package

The CPP-2IRIS Coil Piping Package integrates multiple control components into a single compact assembly, simplifying installation and improving system reliability. Designed for HVAC coil applications, the package ensures precise flow control while allowing easy maintenance and servicing without disturbing piping connections.

Ideal for terminal units and coil applications
Integrated automatic flow limiting and strainer isolation valves
Serviceable components without removing piping connections

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About Texas AirSystems

Texas AirSystems is the largest independent HVAC representative in Texas. Founded over 40 years ago, they are experts in the commercial HVAC market and consistently search for creative and collaborative ways to solve problems. They will stop at nothing to make sure you and your business are taken care of. This quote says it all. “We exist for one reason: the unwavering pursuit of BUILDING PARTNERSHIPS®.

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Arizona State University- Interdisciplinary Science and Technology Building VII

Arizona State University – Interdisciplinary Science and Technology Building VII

Sustainable innovation powering the next generation of interdisciplinary research.

Location Tempe, Arizona

Date of Completion 2022

Representative Varitec Solutions

Griswold Controls Products Used 2000 CPP’s IR’s IS’s and IB’s – ½” and ¾” sizes and hoses.

Facility Description

Construction of the new Interdisciplinary Science and Technology Building 7 at Arizona State University, Tempe Campus, is underway. Sustainability is the focus of the facility design. Within the facility, several buildings will reside, such as the University’s Global Institute of Sustainability, the Institute of Human Origins, a conference center with an expansive 450 seat auditorium, classrooms, public outreach, and exhibit spaces. The project boasts labs for biological sciences, engineering, and life sciences, including a dry lab space for computing, cybersecurity, engineering design, fabrication, and robotics. This facility aims to be LEED Leadership in Energy and Environmental Design certified.

Project Description

With a design focus on maintaining an ecological balance, the Arizona State University ISTB-7 project estimates cost around $192M. The new addition is approximately 281,000 GSF and anticipates a completion date in 2021. This project offers new sustainable design solutions, climate-responsiveness, and regenerative technologies. This new building is estimated to produce enough carbon, energy, water, and waste to achieve triple net-zero performance.

Among the technologies are materials that include ASU’s scientific research and integrated-carbon. The goal is to convert it to nutrients for durable materials and enriched soil. The atrium biome filters waste air, and a wetlands landscape recycles water using natural, bio-based methods. Rainwater is collected, and sunshades help cool the interior of the building. The Sewage is treated and then recycled via low-energy, bio-based processes and then turned into greywater. To save and produce energy, air currents, evapotranspiration, and photovoltaics are used. Ultimately this new facility produces and collects more energy and water than it uses.

Products Used

Griswold Coil Piping Packages (CPP)

Griswold Coil Piping Packages integrate multiple hydronic components into a single assembly to simplify installation and improve long-term HVAC system reliability. These pre-engineered solutions reduce installation time while ensuring accurate system balancing and efficient operation across a wide range of terminal units.

Fan coil units and terminal HVAC equipment
Commercial and institutional building HVAC systems
Applications requiring reliable hydronic balancing and flow control

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About Varitec Solutions

Varitec is a leader in the engineering, development, and installation of large-scale, energy-efficient HVAC systems for commercial buildings. Whether the objective of a customer is to start from scratch, upgrade an existing system, or set up an ongoing service and maintenance plan, we pride ourselves on being a single source for mechanical contractors, engineers, building owners, and general contractors alike. We attribute the sustained success of Varitec to our exemplary employees and dedication to providing world-class products and services.

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320 York Street- Yale’s Hall of Graduate Studies

320 York Street – Yale's Hall of Graduate Studies

Historic restoration meets modern performance at Yale’s iconic graduate campus landmark.

Location 320 York St, New Haven Connecticut

Date of Completion Fall 2020

Representative Mechanical Solutions

Griswold Controls Products Used CPP-2IRIS Packages with QuickPress and customer supplied ATCs

Facility Description

The landmark building at 320 York Street is a collegiate, gothic style building that opened in 1932 as the Hall of Graduate Studies. For well over 80 years, Yale graduate students lived in HGS's humble rooms at the start of their academic careers. Of course, many of Yale's successful humanities faculty had their offices in the building as well. Within the former Hall of Graduate Studies, the common room is being beautifully restored. Today, Yale Graduate School of Arts & Sciences is undergoing a $162 million renovation. Nestled in the heart of the campus, it is transforming into a humanities quadrangle.

Project Description

A substantial hole was carved out where the HGS courtyard used to stand, making way for a new lecture hall and screening room that will hide beneath the courtyard. Inside the courtyard of the soon-to-be humanities quadrangle at 320 York Street, the construction team built new concrete pillars under the original foundations to "underpin" the renovated facility. The construction team worked to ensure the additional layers of the foundation under the tower were perfected. Additionally, the HGS dining hall is being configured into three classrooms.

The steam pipes that ran through the basement of the former Hall of Graduate Studies were removed so that the space can be converted into classrooms, faculty offices, student study spaces, and offices where teaching fellows can meet with students. Additionally, the intricate "wood" paneled ceiling is painted plaster.

This grand project utilized the CPP-2IRIS Packages with QuickPress and customer supplied ATCs. Anticipated Summer of 2020 is the reveal of the new humanities quadrant.

Products Used

CPP-2IRIS Coil Piping Packages

The CPP-2IRIS Coil Piping Package integrates multiple HVAC control components into a single assembly to simplify installation and improve hydronic system efficiency. Designed for coil applications, these packages combine automatic flow limiting valves and strainer isolation valves to ensure reliable performance and easier servicing.

Ideal for fan coil units and terminal HVAC equipment
Integrated automatic flow limiting and strainer isolation valves
Serviceable components without disturbing piping connections

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About Mechanical Solutions

Mechanical Solutions was established in Connecticut, by Gary MacDonald and Ken Reynolds in 1994 to serve the fluid handling needs of the New England Market. They moved their facility to Manchester CT in 2019 to expand and grow their operation, increasing both warehouse and service capabilities.

Their focus is on New Construction, Facility Renovations, System Upgrades, After Market Replacements, and Service. Their marketing territory includes Connecticut, Massachusetts, Rhode Island, Maine, Vermont, and New Hampshire. They provide engineered products and services to the Municipal Waste / Clean Water and Commercial HVAC / Plumbing markets while focusing on long-term relationships with their customers and manufacturers.

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North City Campus Modernization

Modern learning spaces and efficient HVAC systems supporting the future of education in Shoreline.

Location Shoreline, WA

Date of Completion Fall 2019

Representative Proctor Sales

Griswold Controls Products Used CPP-2IRISU, CPP-3IRISU with customer supplied Actuators

Project Images

Facility Description

North City Campus Modernization includes the modifications of Shoreline School District No. 412 Elementary School. Parkwood Elementary is currently in the construction phase with completion expected in the Fall of 2019. The new school will be 64,800 square feet with a capacity for 500 students The project's architect is DLR Architects and a contractor is Allied Construction. The total estimated project cost is $46,909,000.

Parkwood Elementary features a bright and open two-story design. The new Elementary is home to classrooms and flexible learning spaces designed to support diverse learning experiences, styles and needs. With a capacity for 500 students.

The new building meets and exceeds industry standards for geographic, environmental, and physical health and safety as well as easily accessible spaces for public use. It incorporates natural light, has an area for the arts, ADA accessible, well-prepared for technological advancements.

Exceeding the industry standards this project used Griswold Controls Products Used: CPP-2IRISU, CPP-3IRISU with customer supplied Actuators.

Products Used

CPP-2IRISU and CPP-3IRISU Coil Piping Packages

Griswold Controls CPP-2IRISU and CPP-3IRISU coil piping packages integrate multiple HVAC system components into a compact, pre-engineered assembly. These packages simplify installation, improve system balancing, and provide reliable performance for hydronic terminal units in commercial and institutional buildings.

Fan coil units and terminal HVAC equipment
Commercial and educational facilities requiring precise flow control
Systems requiring integrated isolation, balancing, and strainers

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About Proctor Sales

Since 1957, Proctor Sales has been the premier sales and technical resource for boiler, steam and hydronic products in the Pacific Northwest. They pride their selves in representing the "best in class" market leaders in steam and hydronic solutions. Proctor Sales provides manufacturers' solutions through persistent support and expertise from their technical sales staff. Their diversity across markets, geography, products, and people make them stand out.

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University of California, Irvine

UC Irvine Case Study - Griswold Controls

A Higher Tech Education for UC Irvine

Ease of installation and continued product support make the difference at UC Irvine

Project Overview

Solution Automizer® Coil Piping Packages

Contractor A.O. Reed

Mechanical Engineer GEM Engineering & UCI Engineering

Representative J.D. Sales Company

Completion September 2005

The Challenge

UC Irvine Natural Science Unit II Building

In early 2003, GEM Engineering and UC Irvine sought complete coil hookup solutions for the Natural Science Unit II building. Despite competitive pricing from J.D. Sales Company, a competitor initially won the bid with a significantly lower price point.

However, upon technical review, UC Irvine's engineering team rejected the competitor's product, recognizing the importance of performance and reliability over initial cost savings.

The Solution

J.D. Sales Company partnered with Griswold Controls to present an innovative alternative to the traditional approach of using separate components (actuated globe valves, strainers, unions, and isolation ball valves).

The engineering team was introduced to Griswold's Automizer™ Combination Control Valves and CPP-2A coil piping packages, a streamlined solution that consolidates multiple components into just two valves.

Key Advantages

Superior Flow Performance The Optimizer™ Parabolic Flow Insert delivers globe valve performance at ball valve economics
Simplified Installation Complete coil hookup in two valves versus multiple separate components
Integrated Design Combines actuation, isolation, and flow control in a single package
Long-term Value Reduced installation time and maintenance requirements

Field Experience

Site Foreman for A.O. Reed and Company, Kevin Campbell, was worried about installation because he wanted to use his skilled labor most efficiently. Griswold CPP-2A came to the rescue.

Normally, one man can install 3.5 or maybe 4 coil hookups in one day. "With the Automizer packages," said Kevin, "Our guy was able to install 9 packages per day."

Automizer™ Combination Control Valve packages not only gave the contractor the entire coil hookup in just two valves, they cut labor at installation. That's because they require only four connections instead of over ten with individual products.

Remember, low-cost competitors can make sales difficult, but when you take the time to give your customer a higher technology education about Griswold products, they'll pay back your efforts with orders.

The Results

UC Irvine's engineering team recognized the technical superiority and operational advantages of the Griswold solution.

The project ultimately specified over 200 CPP-2A coil piping packages, demonstrating the value of investing in proven, high-performance technology.

This success showcases how taking the time to educate customers about superior technology solutions—rather than competing solely on price—results in better outcomes for all stakeholders.

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Southern Indiana Career and Technical Center

Griswold Controls works with Indiana high school to operate the HVAC system as efficiently as possible using MVP™ Valves.

Project Overview

Application Air Handling Units

Products Used 42 MVP™ Valves, 125 CPP–IRIS Packages

Architect Veazey, Parrott, Durkin & Shoulders

Valve Selection Kevin Smith, Hydronic Sales

Case Study Griswold Controls Southern Indiana Career and Technical Center

A State‑of‑the‑Art Center Built on a Budget

Opening on September 13, 2006, the $32.5 million, 262,000 square foot center is progressive in design, and equipped with state–of–the–art equipment. A major responsibility for the architects and engineers was to integrate concerns about cost–effectiveness and tight school budgets into their design. This applied to all aspects of the center, including the criteria to operate the HVAC system as efficiently as possible given the budget constraints.

Veazey, Parrott, Durkin, & Shoulders were the architects, with mechanical engineer Tom Durkin, P.E. having responsibility for the mechanical systems. Kevin Smith of Hydronic Sales did the valve selection and coordination, ultimately specifying (42) Griswold Controls MVP™ valves and (125) CPP–IRIS packages on the project. There are (21) Trane air handlers regulating the center, and the pumps are controlled by a VFD system.

“We all had a responsibility to the taxpayers to design something functional but frugal at the same time. The planning task force clearly stated that they did not want to build the Taj Mahal with taxpayers’ money.”

— Kevin Smith, Hydronic Sales

Why MVP™ Valves Were the Right Choice

The MVP™ valve was selected because of its ability to work seamlessly within the VFD-controlled pump system while delivering measurable energy and cost benefits across the facility.

Key advantages of the MVP™ on this project:

Tracks with the VFD system Only a change in demand load will cause a flow rate change — not the pressure drop across the valve.
Reduces air side fan energy Flow, coil output, and controlled temperature remain stable, directly reducing fan energy consumption.
Independent circuits Circuits with MVP™ valves are independent, allowing the use of CPP–IRIS on small demand loads and keeping initial costs down.
Factory-set maximum flow rates Maximum flow rate for cooling and heating coils can be set at the factory using dip switches, saving time and manpower in the field.

Through a collaborative effort among the architects, mechanical engineers, and Griswold Controls, Southern Indiana now has a state–of–the–art technical center that accommodates a wide variety of uses — all while respecting the taxpayers’ investment.

Questions about this application? Contact info@GriswoldControls.com or 949.559.6000

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University of California Merced

UC Merced – Irrigation Project

Griswold Controls helps UC Merced meet its "green" campus mission through the use of the 2000 series valves to operate the irrigation systems.

Project Overview

Application Irrigation Project

Griswold Controls Solution 2000 Series Irrigation Valves

Consultants I.S.C. of Livermore, California

Completion Date September 5, 2005

UC Merced, the 10th campus in the prestigious University of California system and the first major American research university to be built in the 21st century, opened September 5, 2005. Only 2 major buildings are finished at this time, with an estimated completion project timeline of five to seven years. The long-range plans call for a 2,000-acre campus surrounded by an 8,300-acre community. Building design and construction emphasized the use of the most cutting-edge "green" building practices, reflecting the university's commitment to environmental conservation and stewardship.

UC Merced is the first new UC campus in 40 years. It was authorized by the California Legislature in 1988 to address the higher-education needs of the state's fastest-growing region, the San Joaquin Valley (population 3.5 million), and provide added capacity for the UC system at about half the rate of students from other parts of the state. UC Merced increases educational access and opportunities for valley students and contributes to the economic growth of Central California.

The San Joaquin Valley, where UC Merced is located, is extremely hot and dry during the summer and cool and damp in the winter. Summer temperatures are consistently in the mid to upper 90's in the area, with some locations topping out at 115°.

The university's irrigation plan had to incorporate the extreme summer temperatures along with principles for green landscaping. The consultants on the project, I.S.C. of Livermore, California, chose Griswold Controls 2000 series valves to operate the irrigation systems, noting that they were the most reliable valves for that environment and the scope of the project. Several hundred 2000 series valves have been installed so far, with several thousand to be used over the life of the project.

2000 series valves are self-cleaning, requiring no filters or screen to replace; self-closing, minimizing stress to the pipes, joints, and sprinkler heads; and constructed of brass and heavy-duty cast iron. No other valve is as versatile or has the potential to save thousands of dollars in potential pipe repairs and maintenance costs.

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David Braley Athletic Centre, McMaster University

McMaster University — Hamilton, Ontario

David Braley Athletic Centre

Replacing conventional control and balancing valves with Griswold Controls pressure independent control valves to reduce energy consumption and deliver exceptional system performance.

11 valves 10 PIC‑V® + 1 MVP™ installed

300 gpm Total peak chilled water flow rate

17°C Peak ΔT achieved (31° F) — vs. 10° C design

Project Overview

Application Air Handler Chilled Water Valves

Products Used 10 PIC‑V® + 1 MVP™ Pressure Independent Control Valves

Representative Kildonan Energy Products

Facility Operations Joe Emberson, Chief Operating Engineer, McMaster University

Location Hamilton, Ontario, Canada

The Challenge

Griswold Controls PIC-V and MVP valves installed at David Braley Athletic Centre, McMaster University

The David Braley Athletic Centre, located on the campus of McMaster University in Hamilton, Ontario, is one of the largest fitness centres at any Canadian university. The athletic complex includes a double gymnasium, indoor 200-meter track, four squash courts, multipurpose studios for karate, yoga, dance and tai chi, and one of the only in-ground hydrotherapy pools in the country.

The building was originally specified with conventional control and balancing valves. Kildonan Energy Products, the local Griswold Controls sales representative, working with University personnel and the construction/design team, identified an opportunity to significantly improve system performance and energy efficiency by switching the air handler chilled water valves to Griswold Controls pressure independent control valves.

With 11 valves serving a peak chilled water flow of approximately 300 gpm, and coils selected for a design ΔT of 10° C (18° F), the system needed to deliver reliable, efficient performance across a wide variety of occupancy and weather conditions.

The Solution

The design team replaced the originally specified conventional valves with (10) Griswold Controls PIC‑V® and (1) MVP™ pressure independent control valves. The building connects to the central plant’s chilled water supply and return lines, and contains variable speed chilled water booster pumps that only run if the mains’ differential cannot satisfy the building.

Why pressure independent valves were the right choice:

Self-balancing operation Valves respond only to load changes, not system pressure fluctuations — eliminating the need for separate balancing valves.
High ΔT performance Coils deliver their full design heat transfer potential, maximising chiller plant efficiency.
Booster pump savings With consistently low chilled water flow requirements, the booster pumps rarely, if ever, need to run.
Simplified design One valve replaces the conventional control valve and balancing valve pair at each coil.

The Results

Performance of the pressure independent control valves has been excellent. ΔT across the athletic centre has been as high as 17° C (31° F) — nearly double the design ΔT — with all systems meeting set point.

“One cool morning in September of ’07, the building was running with 24 gpm of chilled water — less than 10% of the design flow. With the exceptional control provided by the Griswold Controls valves, chilled water flow requirements are very low and the booster pumps rarely, if ever, need to run.”

— Facility Services, McMaster University

McMaster University’s facility services personnel, under the supervision of Chief Operating Engineer Joe Emberson, are diligently dedicated to achieving ideal comfort performance combined with reduced energy consumption from the campus chilled water system. Griswold Controls’ pressure independent valves are proving to be an invaluable resource toward achieving those objectives.

Questions about this application? Contact info@GriswoldControls.com or 949.559.6000

Pressure Independent Control Valves

Griswold Controls’ MVP™ and PIC‑V® are Pressure Independent Control Valves. Pressure independent valves dramatically reduce the energy costs, capital expenses, maintenance costs, performance issues, and capacity limitations associated with typical HVAC system pressure fluctuations. They are designed to replace the conventional 2-way control valve and balancing valve pair installed at heating and cooling coils in buildings.

To obtain the most efficient and optimal results in a system, only the necessary amount — no more and no less — of chilled or heated water must be delivered to the heating and cooling coils at all times. This saves energy, increases available plant capacity, minimizes capital expenses, and simplifies system design and control.

Pressure independent valves stabilize flow. With stable flows, the designed heat transfer is maintained. The result is energy savings because less flow is required to achieve the same heat transfer.

Every year billions of dollars are wasted due to the weaknesses in HVAC heating and cooling systems. If systems do not consistently operate at their designed temperature differential, energy waste occurs and money is needlessly thrown away. This unnecessary expense can be eliminated by using Griswold Controls’ pressure independent valves.

When conventional 2-way valves are used to control the flow of water through coils, various actions — such as adjusting a valve or changing the pump speed — affect pressure in the distribution system. These actions in turn affect the flow through a two-way valve even if the load does not change. The thermostat responds and the valve modulates to bring the flow back to what is required. Until the flow is corrected, the coil operates at an off-design point and will over – or under – condition the space.

With a pressure independent valve, set point deviation will not happen. The valve responds only to a signal from a thermostat indicating the load has changed. By responding only to the change in load, the pressure independent valve is self–balancing — it delivers the proper amount of flow regardless of the state of other components in the system. The entire HVAC system is always in a state of constant flow balance.

Griswold Controls’ MVP and PIC‑V pressure independent control valves ensure that all HVAC systems achieve steady flow and high ΔT at all loads, guaranteeing stable temperature control and better heat transfer — resulting in lower energy costs and lower flow requirements.

MVP™ — Features & Benefits

MVP pressure independent control valves maintain the required flow rate regardless of pressure fluctuations.

Pressure independent control Provides balancing at any point below and including the maximum flow rate, eliminating hot and cold spots in a building.
Reduces energy required Increases chiller efficiency by 15–20% and increases ΔT across coils, heating and cooling more space with less equipment and energy.
Flow stability regardless of pressure No change in flow regardless of pressure fluctuations up or downstream — requires less work for the actuator and increases actuator life.
Multifunction modulating 2-way control Combines differential pressure control with modulating control into one compact valve housing.
Reduces valve and actuator hunting Compensates for pressure changes in the system, increases occupant comfort, and extends both actuator and seat life.
Low torque Reduces actuator size needed, allowing for use of a less expensive actuator.

PIC‑V® — Features & Benefits

PIC‑V & SpaceSaver PIC‑V combine a balancing valve & control valve into one, maintaining flow control regardless of pressure fluctuations.

PIC-V® Pressure Independent Control Valve

Pressure independent control Provides balancing at any point below and including the maximum flow rate, eliminating hot and cold spots in a building.
Flow stability & efficiency No change in flow regardless of pressure fluctuations — heat and cool more space with less equipment & energy, increasing actuator life.
Controls flow exactly Eliminates all overflow or underflow at coils.
Low torque Reduces actuator size needed, allowing for a less expensive actuator.
Universal mounting plate Offers compatibility with most manufacturers’ actuators.
Next generation triple seals & field-repairable stems Provide resistance to chemical treatments and temperature fluctuations, and allow field servicing without removing the valve.

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Perdue School of Business Chilled Water

Salisbury University — Salisbury, Maryland

Perdue School of Business

Improved efficiency of the chilled water system at the new Perdue School of Business at Salisbury University through the use of PIC‑V® and MVP™ pressure independent control valves.

112,800 ft² Total facility square footage

20°F Average chilled water ΔT achieved (vs. 16°F design)

+20% Higher ΔT than designed — exceeded every projection

LEED® Gold certification targeted

Project Overview

Project Salisbury University — Perdue School of Business

Application Chilled Water AHU & Fan Coil Cooling Coils

Products Used PIC‑V® & MVP™ Pressure Independent Control Valves

Design Engineer Todd Garing, PE — Mueller Associates

Griswold Representative Hydro Tec / Green Shoots Controls — Brad Walker

The Facility

This project included construction of the new Perdue School of Business and supporting infrastructure for Salisbury University. The facility provides approximately 112,800 square feet of classroom, assembly, lab, administrative, and general use areas to support current and projected undergraduate, graduate, and executive education programs. The project was designed to achieve LEED® Green Building Gold certification.

Chilled Water Plant

The chilled water system is variable primary flow, consisting of two 150-ton McQuay magnetic bearing variable speed chillers operating at a 50/50 load split, two cooling towers with variable speed fans, two redundant variable speed chilled water distribution pumps, and three condenser water pumps (one as a common backup). The system serves various air handling unit (AHU) and fan coil unit cooling coils, with AHU chilled water flow controlled by Griswold Controls PIC‑V® and MVP™ pressure independent control valves.

Air Distribution Systems

The air distribution system consists of five Variable Volume AHUs with zone reheat coils and one Single Zone Variable Volume AHU. AHUs 1, 4, 5, and 6 serve classrooms, offices, and general areas — each equipped with variable volume static pressure controlled supply fans, volumetric return fan tracking, energy recovery wheels, preheat coils, chilled water coils, air side economizers, and demand controlled ventilation. AHU-2 serves the auditorium exclusively, with a variable volume temperature controlled supply fan, preheat coil, chilled water coil, reheat coil, air side economizer, and demand controlled ventilation.

System Performance Analysis

Tim Jones, the resident operations engineer for the University, provided systems data collected through the Building Automation System (BAS). Load profiles were examined for over a year at conditions from 20% through 100% chiller capacity.

“This system meets our most demanding needs for efficiency and performance.”

— Tim Jones, Resident Operations Engineer, Salisbury University (manages 22 buildings)

These observations are supported by the chilled water system’s actual temperature difference being more than 20% higher than the design of 16°F ΔT. The chilled water system operates at an average 20°F ΔT — reducing the design flow rate from 1.5 gpm/ton (16°F) to 1.20 gpm/ton (20°F). Every metric that was analyzed exceeded projections.

Key performance outcomes:

Average ΔT of 20°F Exceeded the design ΔT of 16°F by more than 20% — at every load condition from startup to full load.
Reduced flow rate Design flow reduced from 1.5 gpm/ton to 1.20 gpm/ton — directly reducing pumping energy.
Stable AHU fan speeds Precise load tracking control kept supply air fan VFD speeds consistent and efficient across all AHUs.
Consistent ΔT stability Temperature difference remained stable through varied AHU supply airflow and chiller capacity conditions.
Proven under peak load System performance confirmed even on a humid 90°F day — as shown in the onboard chiller screens (Appendix A).

“We specified pressure independent control valves and designed for a high chilled water temperature difference to improve energy efficiency and reduce pumping energy specifically. The gathered data supports the performance of the system to deliver consistently high temperature differential at varied load conditions.”

— Todd Garing, PE, Mueller Associates (Design Engineer)

Questions about this application? Contact info@GriswoldControls.com or 949.559.6000

This case study was coordinated by the Griswold Controls representative in Maryland in conjunction with Oscar Walker of Green Shoots Controls.

Griswold Controls Representative — Hydro Tec

Brad Walker — (410) 404-6647

bwalker@hydrotecinc.com

greenshootscontrols.net

Appendix A — Chiller Screen Data

Onboard chiller screens recorded during the case study, including readings captured on a humid 90°F day. Screens are typical of system performance throughout the study period.

Perdue School of Business Chilled Water – Appendix A1

Perdue School of Business Chilled Water – Appendix A2

Perdue School of Business Chilled Water – Appendix A3

Perdue School of Business Chilled Water – Appendix A4

Appendix B — BAS Performance Graphs

Graph Terms CWGPM% – Chilled Water GPM Percentage | CWSY ΔT – Chilled Water System Delta T | Chiller Capacity % – Chiller Capacity Percentage | OATF – Outside Air Temperature Fahrenheit | OATH% – Outside Air Temperature Humidity Percent | SAF VFD Avg % – Supply Air Fan VFD Average Percent | LAT WB-F – Latent Air Temperature Wet Bulb Fahrenheit

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Douthit Hills Dormitory

Location: Clemson University Project Name: Douthit Dormitory
Date of Completion: Unknown
Representative: Heat Transfer Sales
Griswold Controls Products Used: Isolator R CPPs

Description: Located at the entrance to Clemson University along SC Highway 93, the Douthit Hills Development project will provide approximately 1,650 new student beds and a mixed Retail and Student Amenities facility at its center. The project consists of 4 buildings and used over 1,000 coil pipe packages total on the job.

About Heat Transfer Sales LLC:

Heat Transfer Sales is in the comfort business. They are proponents of sustainable and efficient hydronic heating and cooling building solutions, which are at the heart of commercial green building. Partnering with more than 36 premiere hydronic manufacturers around the world dedicated to bringing the best technology to every commercial HVAC and plumbing project, they all work hard to deliver comprehensive hydronic HVAC and engineered plumbing solutions to hospitals, K-12 schools, universities, government facilities, commercial buildings, and more. Their hardworking and talented team includes engineers, technicians, welders, customer service professionals, technical specialists, human resources professionals, accounting professionals, general business specialists, and more.

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Boston University Center for Integrated Science & Engineering

Location: Boston, MA Project Name: Boston University Center for Integrated Science & Engineering
Date of Completion: Spring 2016
Representative: Conservation Solutions Corp
Griswold Controls Products Used: FlowCon SM PICV and Green PICV

Description: A Boston University $140 million, state-of-the-art, nine-story research facility that will bring together life scientists, engineers, and physicians from the Medical and Charles River Campuses. It will contain lab space for approximately 160 researchers, postdoctoral students, and staff, 270 graduate students, and additional space for future faculty. The project installed FlowCon SM Pressure Independent Control Valves on all the AHU’s and other larger HVAC equipment and FlowCon Green Pressure Independent Control Valves on all the smaller HVAC equipment throughout the building.

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