Forums

Forums
Renewable Heating
Air Source Heat Pum...
What’s your ASHP de...
 
Notifications
Clear all
Poll results: What’s your ASHP delta T?
Voter(s): 7
Poll is closed Jan 12, 2025
5  -  votes: 3 / 42.9%
3
42.9%
6  -  votes: 1 / 14.3%
1
14.3%
7  -  votes: 0 / 0%
0
0%
8  -  votes: 0 / 0%
0
0%
Something else  -  votes: 3 / 42.9%
3
42.9%

What’s your ASHP delta T?

 
Air Source Heat Pumps (ASHPs)
Last Post by Gary 10 months ago
4 Posts
4 Users
0 Reactions
923 Views
RSS
 TheBinMan
(@thebinman)
Trusted Member Member
Joined: 1 year ago
Posts: 16
Topic starter 13/12/2024 12:06 am  

Just wondering what delta T folk use with their ASHP?

 

Did increasing it or decreasing it solve any issues or is it all about efficiency?



   
Quote
 AllyFish
(@allyfish)
Noble Member Contributor
Joined: 3 years ago
Posts: 503
13/12/2024 8:58 am  

Around 5.5degK at design output. Narrows to about 2.4degK on WC low load. Constant flow system so variable deltaT.



   
ReplyQuote
cathodeRay
 cathodeRay
(@cathoderay)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 2274
13/12/2024 2:04 pm  

This is of particular interest to me at the moment, as I am trying to work out how my Midea heat pump controls (modulates) its output in response to changing OATs, not whether it uses weather compeensation (it does), but how it implements it in running parameters including the LWT/RWT delta t. The actual LWT/RWT delta t is complicated by the fact that my heat pump almost always (slow) cycles, making the delta t change all the time. However, as it happens, I calculated the mean delta t earlier today for two periods when the OAT was relatively stable over 24 hours, the first mean OAT at 11.40 degrees, the second mean OAT at 6.37 degrees, and the mean delta t values for the two periods were 2.24 and 3.52 degrees.

Neither I nor others who have looked have managed to find a setting in the Midea controller that allows the delta t to be set externally. It appears to come from the heat pumps internal control systems.  


Midea 14kW (for now...) ASHP heating both building and DHW


   
ReplyQuote
 Gary
(@gary)
Prominent Member Member
Joined: 3 years ago
Posts: 350
13/12/2024 5:02 pm  

between 3 and 8 depending on flow temp, Ecodan so fixed flow rate.



   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Podcast Picks

Latest Posts

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