Forums

Forums
Renewable Heating
Air Source Heat Pum...
Heat Pumps in Canad...
 
Notifications
Clear all

Heat Pumps in Canada

 
Air Source Heat Pumps (ASHPs)
Last Post by bontwoody 2 years ago
4 Posts
2 Users
0 Reactions
1,173 Views
RSS
 Mike Patrick
(@mike-patrick)
Honorable Member Member
Joined: 4 years ago
Posts: 172
Topic starter 08/09/2023 3:57 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


   
Quote
bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 844
08/09/2023 4:05 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


   
ReplyQuote
 Mike Patrick
(@mike-patrick)
Honorable Member Member
Joined: 4 years ago
Posts: 172
Topic starter 12/09/2023 7:19 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


   
ReplyQuote
bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 844
12/09/2023 7:22 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


   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Podcast Picks

Latest Posts

Members Online

Click to access the login or register cheese
x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
ShieldPRO →