Helical-Rotary Water Chillers A Trane Air Conditioning party 1

Helical-Rotary Water Chillers
A Trane Air Conditioning 
party 1

Trane Air Conditioning


The Trane Company believes that it’s incumbent on manufacturers to serve the industry by regularly disseminating information gathered through laboratory research, testing programs and field experience.

The Trane Air Conditioning Clinic series is one means of knowledge sharing.It’s intended to acquaint a nontechnical audience with various fundamental aspects of heating, ventilating, and air conditioning. 
We’ve taken special care to make the clinic as uncommercial and straightforward as possible. Illustrations of Trane products only appear in cases where they help convey the message contained in the accompanying text. This particular clinic introduces the reader to the concept of helical-rotary water chillers.


Water chillers are used in a variety of air conditioning and process cooling applications. They are used to make cold water that can be transported throughout a facility using pumps and pipes. This cold water can be passed through the tubes of coils in order to cool the air in an air conditioning application or it can provide cooling for a manufacturing or industrial process
Systems that employ water chillers are commonly called chilled water systems.


There are several types of water chillers that are differentiated by the refrigeration cycle they use or the type of compressor. Absorption water chillers make use of the absorption refrigeration cycle and do not have a mechanical compressor involved in the refrigeration cycle.
Absorption water chillers are the subject of a separate clinic.


Water chillers using the vapor-compression refrigeration cycle vary by the type of compressor used. Reciprocating and scroll compressors are typically used in smaller chillers. Helical-rotary (or screw) compressors are typically used in medium-sized chillers. Centrifugal compressors are typically used in larger chillers.
As mentioned earlier, this particular clinic discusses helical-rotary water chillers

Helical-rotary water chillers can be either air-cooled or water-cooled, referring to the method of rejecting heat to the atmosphere. Both air-cooled and watercooled helical-rotary chillers are generally available from 70 to 450 tons [200 to 1500 kW].
The primary focus in Period 1 is on the water-cooled chiller, although it includes some discussion of air-cooled chiller components. A comparison of air-cooled versus water-cooled chiller applications is included in Period 5..

Helical-Rotary Water Chillers:
period one:

Many of the components of the helical-rotary water chiller are similar to those of other chiller types


This particular helical-rotary water chiller makes use of a shell-and-tube evaporator where refrigerant evaporates inside the shell and water flows inside tubes.
 The compressor is a twin-rotor, helical-rotary compressor. It uses asuction-gas-cooled motor to operate the compressor. Another shell-and-tube heat exchanger is used for the condenser, where refrigerant is condensed inside the shell and water flows inside tubes. Refrigerant is metered through the system using an electronic expansion valve. A liquid/vapor separator can be used to enhance the effectiveness of the refrigeration cycle. An oil supply
system provides near oil-free refrigerant to the shells to maximize heat transfer performance while providing lubrication and rotor sealing to the helical-rotary
compressor. A control panel is also provided on the chiller, and a starter connects the chiller motor to the electrical distribution system.

Helical Rotors


The helical-rotary chiller uses 2 screw-like rotors to perform the compression process.

The rotors are meshed and fit, with very close tolerances, within a housing.Only the male rotor is driven by the compressor motor. The lobes of the male rotor engage and drive the female rotor, causing the 2 parts to counter-rotate.

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  3. Absorption water chillers make use of the absorption refrigeration cycle and do not have a mechanical compressor involved in the refrigeration cycle.We are providing best quality air conditioning repair services in louisville ky area. At After Hours your comfort is our main concern, therefore we are available 24/7 to handle your needs. Air conditioning and heating Shepherdsville, KY

  4. If you've ruled out 'lack of good insulation,' clean filters and freon,
    and you think it's the A/C, mine quit cooling when it was humid out and cooled off outside at night, it didn't have to be so hot; the coils would ice over and block the airflow, and it would run all night but not dehumidify and cool enough.
    The problem was the coils were dirty, and it wasn't enough to just vacuum; plus I couldn't get to all parts of them.
    I called Aloha, and he came and cut out the coils by sawing copper pipes and unscrewing it, took it outside and put this foam cleaner in there and let it work, then he sprayed it clean
    with the garden hose. Put it back in and it worked for 5 or 6 more years.
    Another common problem is the drain pipe (mine is pvc and goes outside and water drips out) can get clogged and has to be cleaned out. I don't hink that's your problem unless the floor is wet around the inside unit.

    lennox ac service

  5. The increased level of humidity in the air often makes people sweat profusely & air cooled chillers serves as a breeding ground for bacteria and parasites.
    air handling units

  6. They are very simple to operate & air cooled chillers have two main varieties. One is air cooled and the other is water cooled chillers.
    air handling units