Forums

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

Air source heat pump with ground air pre heat

 
Air Source Heat Pumps (ASHPs)
Last Post by robl 2 years ago
5 Posts
4 Users
1 Reactions
1,474 Views
RSS
 Oxo2oxo
(@oxo2oxo)
New Member Member
Joined: 2 years ago
Posts: 2
Topic starter 23/02/2023 4:42 pm  

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: 4 years ago
Posts: 4429
23/02/2023 5:03 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: 2 years ago
Posts: 2
Topic starter 24/02/2023 10:54 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: 4 years ago
Posts: 3198
24/02/2023 5:37 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.

Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb

Subscribe and follow our Homeowners’ Q&A heat pump podcast


   
ReplyQuote
 robl
(@robl)
Honorable Member Member
Joined: 3 years ago
Posts: 203
24/02/2023 5:52 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) ,

Currently viewing this topic 1 guest.



Share:

Join Us!

Trusted Installers

Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.

✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available

👉 Find your installer now!

Latest Posts

Members Online

x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
Shield Security →