Ductless Heat Pump: Difference between revisions
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**32F, COP is 3 [https://www.nordicghp.com/2017/01/heat-pump-effective-temperature-range/] but at 10F it appears to be COP=2. | **32F, COP is 3 [https://www.nordicghp.com/2017/01/heat-pump-effective-temperature-range/] but at 10F it appears to be COP=2. | ||
**At -5F, COP=1.3 and it shuts down, for backup heat to take over. | **At -5F, COP=1.3 and it shuts down, for backup heat to take over. | ||
*Pioneer mini-split page says it works to 90% capacity at -13F! [https://www.pioneerminisplit.com/blogs/news/the-benefits-of-a-mini-split-system#:~:text=Low%20temperature%20heating%20has%20been,down%20to%20%2D22%C2%B0F.&text=Full%20DC%20Inverter%20technology%20allows,are%20qualified%20as%20Energy%20Star.] | |||
=Internal Links= | =Internal Links= | ||
Revision as of 21:01, 20 November 2020
Basics
- A heat pump - using air heat exchange - extracts heat or cold from the ambient air. There is an outside compressor, and indoor heat exchanger. A split unit. Install requires placing the heat pump outdoors, and placing one or more heat exchangers indoors.
Working Doc
Efficiency Vs Temperature
- This one says that it's not worthwhile below 30F [1]. How to reconcile with manufacturer claiming -13F?
- It seems to be that it works very poorly at the low temps.
- 32F, COP is 3 [2] but at 10F it appears to be COP=2.
- At -5F, COP=1.3 and it shuts down, for backup heat to take over.
- Pioneer mini-split page says it works to 90% capacity at -13F! [3]