Refrigeration Cycle 4

[EAJ82]

Hey All

My question is about the setting of condensing and evaporating temps in the cycle. Suppose u want to design an 18000 BTU/Hr cycle. to choose the compressor u choose it according to the BTU/Hr rating and it usually has different performances at different temps. then u go to choose the Thermal Expansion Valve, also this valve is rated according to BTU/Hr in terms of evap and cond. temperatures. Then u design the Evaporator and Condenser which are also in terms of the EVP and Cond temperatures. My question is how do u set those temperatures? what will make sure that i end up with a High temperature cycle for example? and not with a low temp cycle?

 

[EAJ82]

yep that should do ...i ran a few tests today, appears the program doesn't consider the heat from the compressor.

feels wierd to design a 60,000 BTU/hr evaporator and have an evaporator working at close to 80,000 Btu/hr (compressor power is adds a 1/3)...takes my condensing temperature a little higher than i expected. ..

so now i got condensing temperature of 130F for 95F ambient air...i wonder what happens on a 115F day reaches 160 i guess...

 

[AbbyNormal]

install it in Canada.

You need some head pressure to push it through the valve but consider a bigger condenser coil

Take the "V" out of HVAC and you are left with a HAC(k) job.

 

[EAJ82]

AbbyNormal (Mechanical) 5 Jul 07 20:11
install it in Canada.

Lool...why u need a new air condition?

 

[EAJ82]

btw..this your posts were by far the most interesting posts i've ever seen on a website..thnx guys really !