What is Chiller: Definition and 13 Discussions

A chiller is a machine that removes heat from a liquid coolant via a vapor-compression, adsorption refrigeration, or absorption refrigeration cycles. This liquid can then be circulated through a heat exchanger to cool equipment, or another process stream (such as air or process water). As a necessary by-product, refrigeration creates waste heat that must be exhausted to ambience, or for greater efficiency, recovered for heating purposes. Vapor compression chillers may use any of a number of different types of compressors. Most common today are the hermetic scroll, semi-hermetic screw, or centrifugal compressors. The condensing side of the chiller can be either air or water cooled. Even when liquid cooled, the chiller is often cooled by an induced or forced draft cooling tower. Absorption and adsorption chillers require a heat source to function.Chilled water is used to cool and dehumidify air in mid- to large-size commercial, industrial, and institutional facilities. Water or liquid chillers can be liquid-cooled, air-cooled, or evaporatively cooled. Water or liquid-cooled systems can provide efficiency and environmental impact advantages over air-cooled systems.

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  1. KingMan

    Mastering Chiller COP: MCQ Answers and Tips

    Summary:: MCQ about COP of chiller The COP of a vapor compression chiller is characterized by its cooling capacity. At low cooling rates, the chiller COP is reduced by the effects of heat leaks to the environment. On the other hand, at high cooling rates, the chiller suffers from a) the high...
  2. B

    Chiller power consumption calculation

    Hello, If I am trying to calculate the heat removed from a chiller system through this formula on engineering toolbox.com: Does COP or efficiency of the equipment come into play with this calculation? For example if a chiller is fully loaded isn't it running more efficient for a watt/ton...
  3. K

    Noisy Chiller: Solutions to Reduce Vibrations

    Dear forum members, We have a water cooled chiller device (see its model in attached link) and we use it to cool a hot mirror element. Unfortunately the chiller is vibrating and the vibrations couple all the way to the mirror through a pair of rubber tubes (1cm in diameter, 2m in length) and a...
  4. I

    Chiller overvoltage problem

    Hello, I have a problem with chiller. The chiller is connected on 400V AC (+-10%) substation. But, at the end of transmission line, on my chiller terminals, I have 410V, my chiller has Un=390V, so the chiller has often breakdown, probably the electronics are so sensitive...do you have any idea...
  5. K

    Help with reducing AC Mains voltage sag at large chiller motor startup

    A 4160v chiller motor is drawing too much power at start-up. Utility company only let's them run it once or twice a year because of it. It dims all the lights etc.. It was originally a primary reactor starter (2 contactors). The PR was replaced with an auto-xfmr and wired the same. So now it’s a...
  6. Assim

    Cooling Hot Water: Find a Solution in 10-15 mins

    I have a project which i need to cool down certain quantity of hot water. I need to cool down water of around 25 litres at 50 Degree celcius to 30 Degree celcius, Static water, not flowing. (or incoming 50 Degrees - Outgoing 30 Degrees with approx 1.5 gallons per minute flow rate) time...
  7. David Gin

    Automated Chiller Temperature Control System

    Hi All, I'm working on an automated chiller control system for final year project. It is a logic control that automatically set the chill water supply temperature based on current demand load and the chillers performance curve to achieve the best efficiency COP for the system. For a variable...
  8. David Gin

    Compressor Water Cooled Chiller Thermal Calculations

    Hi All, Is there a list of thermodynamics equations regarding the chiller process from condenser, evaporator, compressor to the regulator. Say I have chiller load at 90%, what set of equations could I use to determine the supply temperature of chill water and condenser supply temperature to...
  9. Q

    How to increase COP and SCP of the absorption chiller

    Dear all, I would to like to ask do anyone have any idea on how to increase the COP and SCP(Specific Cooling Power) of a silica gel absorption chiller? COP= Heat removed by evaporator/ Heat supplied to system( normally is the hot water supplied to the absorption bed) SCP= heat removed at...
  10. C

    Efficiencies of compressor in industrial chiller system.

    Homework Statement Data: http://postimage.org/image/4bb6y6jrd/ Variables: http://postimage.org/image/sk8xnrru5/ Question asks to find mechanical, volumetric and isentropic efficiencies. The test facility is based around a chiller of nominal cooling capacity of 25 kW. The chiller is...
  11. P

    Chiller Water Loop Contamination

    Hi Its an existing industrial problem. There is a chiller system and two separate Water Circulation loops are there for water flow. First: Piping of the Chiller ( Made of Copper), then Mild Steel Piping upto the storage vessel and the to plate heat exchanger (PHE). Second: Water...
  12. R

    Power factor correction of chiller plant

    I am new at this energy management stuff: My question is, we have a new Central chiller plant where I work that feeds 5 buildings for there A/C. The Power factor at this building is 99% when the chillers are running (outside temp above 50 degrees) but when the chillers are not running the...
  13. J

    Hack an Old Chiller: Is It Possible?

    I'm considering using an old chiller for a research project. It's a simple application, maintaining a bath of water at various constant or slowly varying temperatures. Unfortunately, since it's an http://www.thermo.com/com/cda/product/detail/1,,1000001155238,00.html", it doesn't have any...
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