EcoRenovator - View Single Post - Evaporator sizing

jeff5may · 12-20-13, 06:51 PM

AC,

In the series-connected circuit, I agree that there is more friction present. With a cap-tube metered evaporator, the flow will actually decrease due to this added frction and pressure drop, and the cap tube will need to be modified to adequately feed the larger evaporator. If not modified, the increase in suction superheat and compression ratio could literally burn out the compressor.

A TXV or EXV metered system will attempt to do this automatically if the sensor is moved to the end of the second evaporator. But with the same size compressor, the added heat transfer area will bring the heat gained in the evaporator to the point where the added pressure drop will literally be "sucked out" by the compressor (by increased mass flow and resulting expansion at a higher leaving temperature).

12-20-13, 06:51 PM	#13
jeff5may Supreme EcoRenovator Join Date: Jan 2010 Location: elizabethtown, ky, USA Posts: 2,428 Thanks: 431 Thanked 619 Times in 517 Posts	AC, In the series-connected circuit, I agree that there is more friction present. With a cap-tube metered evaporator, the flow will actually decrease due to this added frction and pressure drop, and the cap tube will need to be modified to adequately feed the larger evaporator. If not modified, the increase in suction superheat and compression ratio could literally burn out the compressor. A TXV or EXV metered system will attempt to do this automatically if the sensor is moved to the end of the second evaporator. But with the same size compressor, the added heat transfer area will bring the heat gained in the evaporator to the point where the added pressure drop will literally be "sucked out" by the compressor (by increased mass flow and resulting expansion at a higher leaving temperature). Last edited by jeff5may; 12-20-13 at 06:55 PM..