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Air Source Heat Pumps (ASHPs)
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
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23/08/2024 9:53 am  

Posted by: @jamespa
↑

…

However I do agree that, by the time you take into account drains, airbricks and other openings, they can be quite restrictive, particularly since we currently pipe into our houses an unlimited supply of methane.

Do bear in mind, though, that methane is lighter than air and so dissipates easily and won’t naturally pool in drains and underground voids.

That’s not to say regulations are or are not overly restrictive; just that there’s not a lot to be gained by comparing R290 with mains gas in terms of safety procedures.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; suus solum profundum variat"


   
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 JamesPa
(@jamespa)
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23/08/2024 10:27 am  

Posted by: @majordennisbloodnok
↑

Posted by: @jamespa
↑

…

However I do agree that, by the time you take into account drains, airbricks and other openings, they can be quite restrictive, particularly since we currently pipe into our houses an unlimited supply of methane.

Do bear in mind, though, that methane is lighter than air and so dissipates easily and won’t naturally pool in drains and underground voids.

That’s not to say regulations are or are not overly restrictive; just that there’s not a lot to be gained by comparing R290 with mains gas in terms of safety procedures.

Fair enough, but gas explosions are not unknown and the quantity is not limited.

You can also have a 13kg propane cannister in a boat or caravan.  The location where its stored has to be ventilated (in a boat, not sure about a caravan), but its piped into the interior where it could pool, eg in the bilges.

 

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Noble Member Moderator
7259 kWhs
Joined: 3 years ago
Posts: 745
23/08/2024 10:43 am  

Agreed, @jamespa, and I remember seeing a video whereby the RNLI teamed up with some Royal Navy ordnance experts to demonstrate the effect of (and likelihood of) pooled bottled gas igniting in a boat. The results were certainly dramatic.

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; suus solum profundum variat"


   
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Toodles
 Toodles
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23/08/2024 10:52 am  

@majordennisbloodnok But it took them several attempts! Toodles

This post was modified 7 months ago by Toodles

Toodles, he heats his home with cold draughts and cooks his food with magnets.


   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Noble Member Moderator
7259 kWhs
Joined: 3 years ago
Posts: 745
23/08/2024 12:19 pm  

Posted by: @toodles
↑

@majordennisbloodnok But it took them several attempts! Toodles

Absolutely. An explosion requires a very specific set of conditions and they took three or four attempts to understand those conditions in detail. Once they found them, of course, the boat was utterly obliterated, and we all hace a better understanding of what not to do.

 

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; suus solum profundum variat"


   
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