Thursday, April 15, 2010

Reducing system losses

15 April 2010: I also did a lot of pipe insulating, both in the house, and in and around the GSHP. If it is now working correctly in the electronics - response to sensors etc - it pays now to find other ways to make it more efficient. I have some rolls of super-thin insulation blanket that deserves to be used.

    In Sweden where the IVTs come from, winter temperatures are much lower, and many GSHPs are stored in basements, garage or or outhouses, so they are designed to protect themselves from frost by having permissible heat losses in the cabinet - there are uninsulated hot pipes in the cabinet, and the main water tank has a completely exposed copper bottom!
   As ours is not moving to an outhouse or garage in a hurry, and lives in a utility room with underfloor heating, it is not in danger of frosting up. I used some insulation inside the cabinet for the water tank bottom and some of the hotter pipes inside the cabinet, before closing up the side and front panels.
   The pipes that send and receive to the underfloor heating are usually in the range of 25-33ÂșC, I thought it was worth insulating them too, to reduce even the very small system losses from these pipes moving through the air in the house, which averages 10 degs lower.

August 2010 comment: The insulation inside the heat pump - around the tank and pipes - has worked very well. You can leave the machine all day and if nobody runs the hot water, the temperature remains very very stable!

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