Image Credit: Emerson Network Power | Pfannenberg, Inc. | Schneider Electric Heating, ventilation and air conditioning (HVAC) chillers are refrigeration systems that provide cooling for industrial and commercial applications. They use water, oils or other fluids as refrigerants.   HVAC chillers include a compressor, condenser, thermal expansion valve, evaporator, reservoir, and stabilization assembly. Compressing the refrigerant creates a high pressure, superheated gas that the...
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Q & A on HVAC Chillers

We asked our users for their input on HVAC Chillers. Here are the results of 229 users familiar with HVAC Chillers.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing HVAC chiller design?
35 answers
Answers:
There are new technologies to save energy like the variable-primary flow, with the use of this kind of system, the chiller must be able to respond to the different variations in the water flow through the coil, so that it must be able to change the chill capacity every time it is needed and in a short time.
~Daniel Vargas, Engineer, San Jose, Costa Rica
Oil Free technology in 2 stage centrifugal compressors (Danfoss Turbo Cor) as well as alternative refrigerants and variable speed technology.
~Gary D, Key Accounts and Contracts manager Smardt chiller group, Melbourne, Australia
Modulating capacity controls and throttling devices. Vfd drives for fans and pumps, pressure transducers and temperature sensors.
~Savyan.m.kunjappu K, H.v.a.c.supervisor., Trichur., India.
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Q:
From your perspective, which companies are creating the most innovative HVAC chillers?
39 answers
Answers:
The Smardt Chiller Group in Montreal Canada with oil-free magnetic bearing compressors, Carrier Corporation (23XRV variable speed screw compressor). Bitzer Germany with variable speed screw technology and alternative refrigerants.
~Gary D, Key Accounts and Contracts manager Smardt chiller group, Melbourne, Australia
Companies realize that here in Brazil: Trane, Carrier and Hitachi.
~Marcelo Frade, Maintenance technician., Belo Horizonte, Brasil
I prefer to work with York (Johnson controls) and Trane SA.
~Venugopal R, Other, Dubai, United Arab Emirates
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Applications and UseTop

Q:
What are some of the applications you have used HVAC chillers for?
55 answers
Answers:
Processes in the automobile industry Fiat Betim / MG-BRAZIL (cooling electro machining lathe in diverse cooling emulsion machining gearbox, oil cooling in high-pressure pump, air conditioning in laboratories, environmental chambers in laboratories, cataphoresis and painting processes, cooling, electrical panels, air conditioning for computers, etc.).
~Marcelo Frade, Maintenance technician., Belo Horizonte, Brasil
I have used Chillers to provide a means of cooling, with the use of other equipment as well. Some things include: - Medical Equipment - Control Rooms - Data/Electrical Rooms
~Engineering, Design, St. John's, Canada
Comfort air conditioning for schools, office buildings, hospitals and various other facilities. Data Center cooling applications. Process cooling for industrial applications.
~Dick E., Marketing/Sales, Detroit, MI
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Q:
Please share with us any “non-standard” applications that HVAC chillers have been used for.
16 answers
Answers:
Chiller to cool the water stored in a particular tank and water from the same tank to be used for process.
~Deepak S, Marketing/Sales, Delhi, UAE
Data centres, fish farms, plastic extrusion, wineries, welding machines, laser machines.
~Gary D, Key Accounts and Contracts manager Smardt chiller group, Melbourne, Australia
Can be used to cool down the chemicals and polymer machines during process.
~Muhammad Asif Warraich, Facility Engineer, Dubai, UAE
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Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of HVAC chillers?
14 answers
Answers:
A shopping center in Australia with 2 x 2800kW single centrifugal compressor chillers and no low load chiller. When the Bakery started work at 5 am there was a load requirement of 100kW these very large chillers can not turn down that low. A light load chiller was eventually installed at the expense of the design engineers indemnity insurance.
~Gary D, Key Accounts and Contracts manager Smardt chiller group, Melbourne, Australia
Particular attention must be paid to the application of two or more chillers with evaporators in parallel or series when the brine temperature is below 32°F (0°C). The brine MUST NOT flow through the evaporator of the idle chiller, because it can cause the condenser water to freeze.
~Micu A, Engineering Consultant, Bucharest, Romania
Automation of chillers with flooded evaporator without waiting time due to shut down the pumps cold water after stopping the equipment, causing disruption of the heat exchanger, and refrigerant leakage of water into the system.
~Marcelo Frade, Maintenance technician., Belo Horizonte, Brasil
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
25 answers
Answers:
1- Chiller incorporated with screw or scroll compressors. 2- Environmentally Friendly Refrigerant. 3- Low noise level.
~Nabil D, Engineering Consultant, Dubai, UAE
-lowest sound level -good EER (energy efficiency rating ) -easy maintenance -easy integration in BMS
~Micu A, Engineering Consultant, Bucharest, Romania
Heat extracted from the ash which is directly coming out from the boiler/ furnaces.
~Pran A, Project Manager, Kolkata, India
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Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using HVAC chillers?
26 answers
Answers:
People buying HVAC chillers need to look at life cycle costing. i.e. running costs over the full operational season, part load efficiency can often save a lot of money. Therefore a machine with higher capitol cost can have a payback period of as little as 12 months. Maintenance costs are also important as are pressure vessel coding and compliance with local regulations. Any chiller company that cannot provide the afore mentioned details and qualifications is to be avoided.
~Gary D, Key Accounts and Contracts manager Smardt chiller group, Melbourne, Australia
In my experience I recommend York chillers due to the ease of maintenance and easy availability of spares, as well as the price. Trane chillers are excellent but there is a problem with availability of spares and they don't want any other professional maintaining their brand other than themselves.
~Venugopal R, Other, Dubai, United Arab Emirates
Cheapest is not always the best approach when operation cost and life cycle are considered. Set the system parameters up carefully - temp, variable flow or not, etc. Carefully consider minimum system loads against the individual chiller ability to meet that (for multiple chiller installations).
~Les R, Design Manager, Dublin, Ireland
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Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of HVAC chillers?
19 answers
Answers:
Chillers should be selected to closely match the load profile of the building or process to be cooled. Minimum capacity is as important as full load capacity. Never oversize your chiller, bigger is not better in this case. If a machine cannot match both ends of the load profile then one larger and one smaller chiller can be selected to maximize efficiency and provide stable operation.
~Gary D, Key Accounts and Contracts manager Smardt chiller group, Melbourne, Australia
In my more than 3 decades of responsibility for selection of chillers and directing design concepts, I have found design engineering firms fudging input load parameters to oversize chiller plant capacities by 20-30%.
~LEIF S, Engineering Consultant, LEXINGTON, TN
Selection of capacity ratings depends on: - Performance Data Correction Factors (altitude) - Ethylene Glycol Correction Factors - Outside ambient air temperature
~Micu A, Engineering Consultant, Bucharest, Romania
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