Renewable Heating Hub Heat Pump Forums

Search with Wattson
Forums
Renewable Heating
Air Source Heat Pum...
Air source heat pum...
 
Notifications
Clear all

Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!

Air source heat pump with ground air pre heat

 
Air Source Heat Pumps (ASHPs)
Last Post by robl 4 years ago
5 Posts
4 Users
1 Reactions
3,281 Views
RSS
 Oxo2oxo
(@oxo2oxo)
New Member Member
Joined: 4 years ago
Posts: 2
Topic starter 23/02/2023 3:42 pm   [#854]

We have a reasonable garden but not quite big enough for ground source. Anybody ever installed underground air pipes to pre-heat an air source heat  pump?



   
Quote
Topic Tags
Under ground air pipes
 Derek M
(@derek-m)
Illustrious Member Member
Joined: 6 years ago
Posts: 4425
23/02/2023 4:03 pm  

Posted by: @oxo2oxo
↑

We have a reasonable garden but not quite big enough for ground source. Anybody ever installed underground air pipes to pre heat  air sourced pump ?

Many, many years ago, I remember watching a TV program about a test house that was built, I think in Sweden, with not a heat pump, but MVHR.

The incoming fresh air was being supplied via pipework under the garden, which then went through a heat exchanger, and was being additionally  heated by the warm air coming out of the building.

I suppose the same idea could be used to pre-heat the air going into an ASHP, but if you are digging up the garden to lay pipework a GSHP would probably be more efficient.

On a post within the forum, I previously proposed the idea of using stored heat energy using water heated by solar thermal, to pre-heat the air supply to an ASHP during the colder nighttime period.

 



   
ReplyQuote
 Oxo2oxo
(@oxo2oxo)
New Member Member
Joined: 4 years ago
Posts: 2
Topic starter 24/02/2023 9:54 am  

@derek-m Hi garden not big enough for ground source but we could get a reasonable amount of pipe in to pre heat the air. We are doing an extension so will have digging going on. Just trying to see if any body has any experience

 



   
ReplyQuote
Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 6 years ago
Posts: 4958
24/02/2023 4:37 pm  

@oxo2oxo, have you considered drilling a borehole if you're wanting to invest in a ground source heat pump? You don't need much space at all for the boreholes and the rigs they use for drilling a the size of vans so they're quite compact. It's an option.


🔥 Britain’s Heat Pump Shitshow
How Installing a Heating System Became a National Nervous Breakdown
Free UK shipping.
📗 Heat Pumps Explained
A Jargon-Free Guide for Homeowners
Rewritten and updated for 2027
📘 From Zero to Heat Pump Hero
🛠️ Bodge Buster
New to heat pumps?
Take the Heat Pump Fundamentals course and use INTRO50 at checkout for 50% off.


   
ReplyQuote
 robl
(@robl)
Reputable Member Member
Joined: 5 years ago
Posts: 216
24/02/2023 4:52 pm  

Posted by: @derek-m
↑

Many, many years ago, I remember watching a TV program about a test house that was built, I think in Sweden, with not a heat pump, but MVHR.

The incoming fresh air was being supplied via pipework under the garden, which then went through a heat exchanger, and was being additionally  heated by the warm air coming out of the building.

I think that did use to be a thing, but it is fraught with difficulty.  Mice getting in, mould, stagnent water pools.  All of these can be tackled - grills, special silvered pipes, sloping and drained.  The reason to do it for MVHR is to improve the efficiency - but MVHR efficiencies are so high now there's little point.

I can sort of understand for ASHP, but you'd have to be careful that the pressure drop wasn't too great, it sounds difficult in practice.

 



   
👍
1
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  
Topic Tags:  Under ground air pipes (1) ,
Share:

SPONSORS

Join Us!

Installer Finder

Degrees of Separation

Latest Posts

SPONSORS

Members Online

 No online members at the moment

Click to access the login or register cheese
Protected By
Shield Security PRO