Heat sink in greenhouse

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rmenmuir
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Heat sink in greenhouse

Post: #188975 rmenmuir
Wed Mar 03, 2010 11:22 am

I remember seeing one of the It Isn't Easy Being Green programmes where they dug a hole in a greenhouse and put in some pipes etc to make a passive heat source. I can't remember what they used or how they did it :scratch: . Does anyone know how to do this?

Richard

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Re: Heat sink in greenhouse

Post: #188985 Big Al
Wed Mar 03, 2010 12:45 pm

You will get the info on this site http://www.thegreenlivingforum.net/forum/ as this is the new forum for the formally "it's not easy being green" forum. Where it is I'm not sure as I have lost my membership details.
Also if you are thinking of digging a hole in the greenhouse why not look at sinking a water barrel into the hole as the water will act as a heat sink ( I think) and the water will be at a constant temperiture to water your plants.

HTH

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Re: Heat sink in greenhouse

Post: #188986 wulf
Wed Mar 03, 2010 12:47 pm

I seem to recall seeing that episode. I think they used a prodigious amount of crushed glass to hold the heat collected during the day, which makes it a potentially difficult one to duplicate.

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Re: Heat sink in greenhouse

Post: #188998 Odsox
Wed Mar 03, 2010 2:06 pm

I seem to remember from yonks ago that someone recommended glass bottles for the greenhouse path for retaining heat.
What he did was fill dozens of bottles with water, put the caps (or corks) in and bury upside down so that the bottoms of the bottles formed the path surface.
Probably not so good with wine bottles with dimpled bottoms :oops: :iconbiggrin:
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Re: Heat sink in greenhouse

Post: #189012 Green Aura
Wed Mar 03, 2010 2:40 pm

Maggie

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Re: Heat sink in greenhouse

Post: #189018 grahamhobbs
Wed Mar 03, 2010 4:04 pm

These are some great ideas, some simple and others perhaps a bit costly, but has anyone done any studies to discover the real value of them? Do they have a really significant effect or do they only lift the temperature a degree or so? I know in a polytunnel at CAT in Wales, they have a deep bore hole down into the slag (that's what CAT is built on, old slag heaps) that releases warm air up and I seem to remember them saying it makes a few degrees of difference, you can actually sense the warm air rising. It would be interesting if anyone knew of any other research.

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Re: Heat sink in greenhouse

Post: #189020 Green Aura
Wed Mar 03, 2010 4:37 pm

You can feel warmer air coming out of the piping. But I have to confess I've not been in the polytunnel during the night :lol: But last winter it didn't drop below 4C.

I think it went below zero this year by a degree or two. But as Altnaharra (20 miles due east of here) recorded -22.3C at one point, I'm guessing the sink was helping - I think we got down to about -10-15C but I'm not sure (just know it was bl**dy cold!) :lol:
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Re: Heat sink in greenhouse

Post: #189034 Minnesota
Wed Mar 03, 2010 7:31 pm


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Re: Heat sink in greenhouse

Post: #189037 Big Al
Wed Mar 03, 2010 7:59 pm

The simplest form of taking the chill off the greenhouse is a candle inside one of the concrete type building blocks. The candle heats up the air and the block pushes it upwards.

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rmenmuir
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Re: Heat sink in greenhouse

Post: #189040 rmenmuir
Wed Mar 03, 2010 8:42 pm

Wow! Thanks for all the suggestions and advice. I like the idea of the bottle path - means I've got a good excuse to drink lots of wine so I can recycle the bottles :icon_smile:

I'm not so sure about the powered fan system as it's a long way from an electricity source but if I ever get a small solar panel I'll definitely give it a go.

I'll follow some of these up and let you know how it works out.

I thought it was cold enough here in Wales but I think Durness beats our record! I'm surprised you can grow much up there. Mind you, I recall seeing a sign for a hydroponic nursery just beyond Ullapool last time I was there.

Richard

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Re: Heat sink in greenhouse

Post: #189041 Green Aura
Wed Mar 03, 2010 9:19 pm

rmenmuir wrote:I thought it was cold enough here in Wales but I think Durness beats our record! I'm surprised you can grow much up there.


It was only for one night:lol: :lol: And it's not a regular occurrence. Usually the weather's pretty good here.
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