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Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 8 months ago
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 Mike Patrick
(@mike-patrick)
Reputable Member Member
1603 kWhs
Joined: 3 years ago
Posts: 152
Topic starter 08/09/2023 2:57 pm  

I found this story from Atlantic Canada (Halifax, Nova Scotia) interesting.

https://www.nationalobserver.com/2023/09/08/news/heat-pumps-challenge-chill

The efficiency achieved at low (eg -20C) temperatures was something I can only envy.

The Grant technician who did my annual service yesterday agreed with me that it would be cheaper to run the DHW off the immersion heater, than off the ASHP, when the outside temperature was below Zero (here it touched as low as -8C in last winter's cold snap and the kWh consumption of my ASHP went off the scale). I'm going to try this the coming cold season. He also said that the cold damp weather we had, when the ASHP was almost permanently frosted up, was a problem.

Also from that Canada article note that the grid electricity is only 16 cents /kWh - that's about 9p/kWh. In my dreams.

 

Mike

Grant Aerona HPID10 10kWh ASHP


   
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 bontwoody
(@bontwoody)
Noble Member Contributor
2888 kWhs
Joined: 2 years ago
Posts: 412
08/09/2023 3:05 pm  

Interesting article Mike, Im surprised the technician said that about your DHW, as to be true your heat pump would have to have a COP of less than 1 at-8C. If thats true its not a good advert for Grant?

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 Mike Patrick
(@mike-patrick)
Reputable Member Member
1603 kWhs
Joined: 3 years ago
Posts: 152
Topic starter 12/09/2023 6:19 pm  

Here's a link to another recent study of the efficiency of heat pumps at mildly low temeratures, from a number of countries.

https://www.cell.com/joule/fulltext/S2542-4351(23)00351-3?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2542435123003513%3Fshowall%3Dtrue

 

All very encouraging. I wish it reflected my own experience at mildly low temperatures.

Depending on the design and fitting of an individual installation I think there can be a significant difference between the efficiency of the pump itself and that of the overall installation.

 

Mike

Grant Aerona HPID10 10kWh ASHP


   
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 bontwoody
(@bontwoody)
Noble Member Contributor
2888 kWhs
Joined: 2 years ago
Posts: 412
12/09/2023 6:22 pm  

@mike-patrick That is certainly true Mike, have a look at this video from heatgeek

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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