Air Conditioning

[nastran2002]

Hello,

I may have to put together a air cooling system. One option is to blow air on a finned tube like an evaporator. My question is what if I do not have enough heat in the air to evaporate all the refrigerent? How is this done in standard a/c applications? Are there heaters or expansion tanks used to make sure that only gaseous refrigerent goes into the compressor?

Thanks

 

[dcasto]

they are called superheaters. You restrict the flow through things like: recycles, lower suction pressures.

 

[MintJulep]

In "standard" a/c the refrigerant flow is metered - typically with a thermal expansion valve - to maintain some level of super-heat leaving the evaporator.

The suction pressure is often monitored, and the compressor will either unload, or shut-off when it drops to low.

Some systems will incorporate a suction accumulator to prevent liquid from reaching the compressor under unusual operating conditions.

Some systems will incorporate a suction/discharge heat exchanger.

 

[imok2]

If the load is say less then 5 tons you may want to install a variable speed scroll compressor. this will adapt to a variable load better then a compressor with unloading. estimate the prejected load as close as possible