A Higher Tech Education – Ease of installation and continued product support make the difference at UC Irvine
Griswold Controls Solution: Automizer® Coil Piping Packages
Contractor: A.O. Reed
Mechanical Engineer: GEM Engineering & UCI Engineering
Griswold Controls Rep Firm: J.D. Sales Company
Completion Date: September 5, 2005

J.D. Sales in Southern California took the time to educate their customer about the higher technology solution of Automizer™ Combination Control Valves, and were rewarded for their efforts with a big order of over 200 CPP-2A coil piping packages and a very happy customer.

Mechanical Engineering firm GEM Engineering (San Diego) in conjunction with UC Irvine contacted J.D. Sales Company in early 2003. They required complete coil hookups for their project at the Natural Science Unit II building at the University of California, Irvine. Mahendra Mistry, owner of J.D. Sales Company, gave pricing to the contractor, A.O. Reed & Company, that he thought would surely bring him the job. Unfortunately, a lowprice competitor came in with a bottomscraping price.

The reviewing Mechanical Engineer from UC Irvine contacted Mahendra Mistry on acceptability of the competitor’s product and after careful consideration the engineer decided to turn it down on technical reasons.

The engineering team at UC Irvine planned to use separate components in their design: actuated globe valves, strainers, unions and isolation ball valves. Regional Director (Western Region) Joe Schaefers and Vice President of Sales Jim Hoctor accompanied J.D. Sales Company staff on a meeting with the engineers at UC Irvine, to discuss the advantages of using Griswold’s Automizer™ Combination Control Valves over actuated globe valves.

Mahendra Mistry said the sample cutaway valve he brought along really grabbed the engineers’ attention. He showed the engineers how the design of Griswold’s Optimizer™ Parabolic Flow Insert delivers the performance of a globe valve at a ball valve price. They also reviewed the advantages of the CPP-2A coil piping package, emphasizing the multifunction aspect of Griswold’s valves, and giving contractors the entire coil hookup in just two valves.

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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.

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

Application: Air Handling Units
Griswold Controls Solution: MVP Valves
Contractor: Industrial Contractors
Engineer/Consultant: Tom Durkin
Completion Date: October 2006

The Evansville–Vanderburgh School Corporation, along with the Indiana Department of Workforce Development and local businesses, saw the critical need for a vocation–technical high school. Working together, they envisioned a school that would not only educate high school students, but also meet the changing demands of workforce training and technology. Resulting from a public 54–member planning and design task force, the new Southern Indiana Career and Technical Center (SICTC) will educate and prepare high school students for employment within local industries. In addition, the Technical Center will offer adult continuing education courses, workforce development programs, and general education classes for the entire Southern Indiana region.

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; mechanical engineer Tom Durkin, P.E., having responsibility for the mechanical. Kevin Smith of Hydronic Sales did the valve selection and coordination, ultimately using (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.

As Kevin Smith stated, “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 Majal with taxpayers’ money.”

The MVP™ will track with the VFD system, only a change in demand load will cause a flow rate change, not the pressure drop across the valve. In addition, the MVP™ reduces air side fan energy because flow, coil output, and controlled temperature remain stable. Also, circuits with the MVP™ valves are independent, thereby allowing the use of CPP–IRIS on small demand loads, keeping the initial cost down.

Another advantage to using the MVP was that the maximum flow rate for the cooling and heating coils is able to be set at the factory using dip switches, saving time and manpower in the field. Through a collaborative effort, Southern Indiana now has a state–of–the–art technical center that accommodates a wide variety of uses.

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

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Griswold Controls helps UC Merced meet it’s “green” campus mission through the use of the 2000 series valves to operate the irrigation systems.

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.

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

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Replacing the conventional control and balancing valves with Griswold Controls pressure independent control valves to reduce energy consumption.

Griswold Controls Has the Inside Track at McMaster University

The David Braley Athletic Centre, located on the campus of McMaster University, 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.

In August of 2006 David Braley, a Hamilton businessman, owner of the Canadian Football League’s B.C. Lions, and a former McMaster student-athlete, donated $5 million for the recreation centre. Commissioning was completed in the fall of 2006, and the centre’s first summer of operation was in 2007.

The building was originally specified with conventional control and balancing valves, but Kildonan Energy Products, the local Griswold Controls sales representative, working with University personnel and the construction/design team changed the air handler chilled water valves to Griswold Controls pressure independent control valves.

There are 11 valves, (10) PIC-V® and (1) MVP™ pressure independent control valves for the building, with total peak chilled water flow rate at about 300gpm. The coils were selected to provide a chilled water ΔT of 10º C (18º F). 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.

Griswold Controls (10) PIC-V® & (1) MVP™ pressure independent control valves guarantee ideal cooling system comfort performance and reduce energy consumption at David Braley Athletic Centre

Performance of the pressure independent control valves has been excellent. ΔT across the athletic centre has been as high as 17º C (31º F) with all systems meeting set point. As an example of the system’s effectiveness, one cool morning in September of ’07 the building was running with 24gpm 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.

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.

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Every year billions of dollars are wasted due to the weaknesses in HVAC heating and cooling systems. If heating and cooling 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, and may in turn change the temperature in the space. The thermostat responds and the valve modulates to bring the flow back to what is required to meet the load. 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 design set point deviation will not happen. The valve responds only to a signal from a thermostat indicating the load has changed. A pressure independent valve will not feel the operation of other equipment on the system. By responding only to the change in load, the pressure independent valve is self–balancing, it delivers the proper amount of flow to meet the requirements of the load regardless of the state of other components in the system. By stabilizing heating and cooling coil flow in spite of pressure variations, more space can be heated and cooled with less equipment and less energy, and 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. This ultimately results in lower energy costs and lower flow requirements for proper heat transfer.

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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 valves.

Project: Salisbury University | Perdue School of Business
Location: Salisbury, Maryland
Architect of Record: RCG, Inc.
Associate Architect: Perkins + Will
Mechanical Engineer: Mueller Associates, Inc.
Griswold Controls Representative: Hydro Tec
Author: Brad Walker

This project included construction of the new Perdue School of Business and supporting infrastructure for Salisbury University. The facility includes approximately 112,800 square feet providing various classroom, assembly, labs, administrative and general use areas to support current and projected undergraduate, graduate and executive education programs. This project expects to be awarded a Leadership in Energy and Environmental Design (LEED®) Green Building Gold certification.

The chilled water system is variable primary flow consisting of two 150 ton McQuay magnetic bearing variable speed chillers 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. The AHUs chilled water is controlled by Griswold Controls Pressure Independent Valves, PIC-V and MVP valves.

The Air Distribution Systems consist of five Variable Volume AHUs with zone reheat coils and one Single Zone Variable Volume AHU. AHUs 1, 4, 5 and 6 are all similar and serve either classrooms, offices, or general areas. These air handling units all have variable volume static pressure controlled supply fans with volumetric return fan tracking, energy recovery wheels, preheat coils, chilled water coils, air side economizers, and demand controlled ventilation. AHU-2 serves the auditorium only. It has a variable volume temperature controlled supply fan with volumetric return fan tracking, a preheat coil, chilled water coil, reheat coil, air side economizer and demand controlled ventilation.

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PROJECT: ANALYSIS OF CHILLED WATER SYSTEM ∆T FROM 8/12 TO 9/13

Tim Jones, the resident operations engineer for the University, provided systems data collected through the Building Automation System (BAS). The load profiles were examined for over a year at conditions from 20% thru 100% chiller capacity. Mr. Jones manages 22 buildings and stated “this system meets our most demanding needs for efficiency and performance.”

These observations are supported by the chilled water system actual temperature difference being more than 20% higher than the design of 16ºF ∆T. The chilled water system operates at an average 20ºF ∆T; the design for 1.5gpm/ton (16ºF) was reduced to 1.20 gpm/ton (20ºF) gpm per ton. Every metric that was analyzed exceeded projections. The AHU fan speeds were stable with precise load tracking control. The stability of the chilled water system temperature difference through varied AHUs supply airflow and chiller capacity is what can be expected with Pressure Independent temperature control valves. The design engineer Todd Garing, PE at Mueller Associates said. “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.”

The onboard chiller screens shown in Appendix A were typical throughout the case study. These screens were actually recorded on a humid 90 degree day. See Appendix B for supporting information with graphs of the data collected during the study. The stability of the system under all load conditions were proven on every occasion from startup to full load.

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

Appendix B

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 FVD Avg % – Supply Air Fan VFD Average Percent
LAT WB-F – Latent Air Temperature Wet Bulb Fahrenheit

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