Hello to all,

I am new to the forum and already found and read a lot of good information.

I want to build water to water heat pump about 10-12kW. I have knowledge in assembling, automation etc, but not in selecting components. I plan to use Copeland ZH compressor and Swep plate heat exchangers. I have downloaded Copeland's selection software and have some questions about selecting operating points. My water source has about 5-10 deg. C and I will use heat pump for underfloor heating. I will also use inverter to control heat pump power (control compressor's rpm).

My questions (for start ) are:

1. what should be evaporating temp. and superheat?
(My guess is 5 deg. C and 5 deg. C. superheat)


2. what should be condensing temp. and subcooling?
(My guess is 35 degC so I go with 30C to underfloor heating)


3. I want to use heat pump also for domestic water heating (55deg. C)

Does it mean I just divert heated water to the domestic water tank and leave it circulating until it reaches 55 deg. C?


Regards and thank you for your help!