How do air conditioning systems typically control?

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21-12-2011, 06:35 PM
ijohn

How do air conditioning systems typically control?

Hi all!
Have been searching around for the information on the following but with little found!
Two things,
How does a split air conditioning system typically control refrigerant flow?
And how does a vrf/vrv actually work and control?
Thanks!
21-12-2011, 11:26 PM
Brian_UK

Re: How do air conditioning systems typically control?

Split, via a capillary tube or a TXV.

VRF/VRV a little more complicated but the same principles.

What is your level of knowledge/expertise? This will help to form answers.

You can often gather information from manufacturers websites.
22-12-2011, 12:09 AM
ijohn

Re: How do air conditioning systems typically control?

Thank you for the reply, I am in my first year of my apprenticeship in industrial fridge but did spend a couple of years split bashing with no knowlege of how the systems controlled especially vrf,, hense the curiosity. I am struggling to find any detailed informaion on vrf that's not a sales booklet though,
22-12-2011, 09:14 PM
icemanpaj

Re: How do air conditioning systems typically control?

VRV/F's are either set up with 2 pipes or 3 pipes from outdoor to indoor.
The 2 pipe systems are much the same as a multi head split system where all the units have to be set to either heating or cooling. The 2 pipes are liquid line and suction line (cooling) and discharge and liquid (heating). Each indoor unit will have its own electronic expansion valve controlling the refrigerant flow to that particular indoor. They use sensors to constantly monitor the superheat and open close accordingly. Once the indoor reaches its setpoint the valve closes stopping refrigerant flow.
A 3 pipe system has 3 refrigerant lines running to a BS or BC box. (a box with solenoid valves to select heating or cooling) The 3 lines are Liquid line, Discharge line and Suction line. from the BS box there will be 2 lines running to each individual indoor unit. The 3 pipe system allows heating and cooling to be selected individually.
22-12-2011, 10:47 PM
Brian_UK

Re: How do air conditioning systems typically control?

Hi John

If you download some of the Engineering Manuals you can gain some info by looking at the various layouts shown; have a look some Daikin stuff here....
http://www.daikinac.com/commercial/d...w.asp?sec=docs
12-06-2012, 09:09 AM
anusha

Re: How do air conditioning systems typically control?

Hi

Air conditioning is removal of heat from indoor.It reduces the humidity of the air,consumed by the equipment.The cold water evaporator coil condenses water vapor from the processed air....
http://www.omicsonline.org/engineering-journals.php
12-06-2012, 05:28 PM
jdunc2301

Re: How do air conditioning systems typically control?

Hey, if you have a look at some pipe diagrams you can see the whole system and how/where it works, LG equipment is poor but the pipe diagrams found here: http://www.mylg.co.uk/productdatabooks.html are good.

All the best

J
12-06-2012, 08:35 PM
stufus

Re: How do air conditioning systems typically control?

2 pipe simultaneous Heating and cooling has been around for a while now!!!!!!!
Mitsubishi Electric City Multi......

Quote:

Originally Posted by icemanpaj

VRV/F's are either set up with 2 pipes or 3 pipes from outdoor to indoor.
The 2 pipe systems are much the same as a multi head split system where all the units have to be set to either heating or cooling. The 2 pipes are liquid line and suction line (cooling) and discharge and liquid (heating). Each indoor unit will have its own electronic expansion valve controlling the refrigerant flow to that particular indoor. They use sensors to constantly monitor the superheat and open close accordingly. Once the indoor reaches its setpoint the valve closes stopping refrigerant flow.