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NiHaoMike · 07-29-14, 06:57 PM

Then it would be a range extender rather than an APU, but same idea.

Assuming the generator is 30% efficient (diesels generally do better) and the thermal recovery system can recover 80% of the waste heat, the heat pump only needs to get a COP of 1.47 (EER of 5) to beat an ideal furnace. For comparison, a cheap window A/C easily does 9.7 EER or more.

07-29-14, 06:57 PM	#456
NiHaoMike Supreme EcoRenovator Join Date: Oct 2008 Location: Austin, TX Posts: 1,154 Thanks: 14 Thanked 257 Times in 241 Posts	Then it would be a range extender rather than an APU, but same idea. Assuming the generator is 30% efficient (diesels generally do better) and the thermal recovery system can recover 80% of the waste heat, the heat pump only needs to get a COP of 1.47 (EER of 5) to beat an ideal furnace. For comparison, a cheap window A/C easily does 9.7 EER or more. __________________ To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...