Ductless Heat Pump: Difference between revisions
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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. | =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= | |||
<html> <iframe src="https://docs.google.com/presentation/d/e/2PACX-1vRPSjCUM5s-lk-HrRuEeZSsXeW1g0Cf7ir1jz_4p_vTgotql5yg0Y8KtIRAHr6TGTK-RFmC52nu34SP/embed?start=false&loop=false&delayms=3000" frameborder="0" width="480" height="389" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe> </html> | |||
[https://docs.google.com/presentation/d/15mYKFucL57P8U_dvaXIhAW36M7y_NE7EAeoDSx3XvC0/edit#slide=id.g5c3be0ce2d_1_28 edit] | |||
=Efficiency Vs Temperature= | |||
*This one says that it's not worthwhile below 30F [https://asm-air.com/heat-pump/what-temperature-is-a-heat-pump-not-effective/]. How to reconcile with manufacturer claiming -13F? | |||
*It seems to be that it works very poorly at the low temps. | |||
**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. | |||
*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.]. just try it. | |||
=Internal Links= | |||
*[[Hydronic Cooling]] | |||
[[Category: HVAC]] | |||
Latest 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]. just try it.