How To Keep A Polytunnel Warm
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- čas přidán 28. 02. 2015
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Our video on how to keep a polytunnel warm shows our three attempts at retaining day time heat during the night. Eventually we managed to warm our polytunnel by around 4 degrees celcius.
We compared our polytunnel temperature to the temperature of an outside thermometer in our garden. This enabled us to benchmark improvements to our polytunnel temperature by comparing the difference with our garden thermometer.
Music: CZcams audio library 'Accidents Will Happen' by Silent Partner. - Jak na to + styl
A tunnel that size could be easilly heated with something called biomeiler.
Basicly you make an compost heap, containing nitrogen(manure,green parts of plants, green grass) and carbon(straw/hay, brown parts of plants, wood chips)
The compost heap will start to heat in 4 days.
Put an coil of pvc or hose in the pipe, pump water through it from an container in the polytunnel.
You can heat the water up to 60C° this way.
The (large) container with water will act like an radiator in your greenhouse.
You could also pump the hot water underneat your soil, returning it to the container.
Just an hot compost heap in the greenhouse also works, but it takes space and might be to hot to plant nearby.
This fall, i will construct an polytunnel, 10*5 meters. In the middel i'll make an raised bed, 60cm above soil and 30cm underground.
This will be my compost heap and act as an table to put trays with plants and seedlings in.
I will add an 2000liter container with water, wich will be heated by the compost going around it, water going through the compost and back in and maybe an large outdoor compost heap to heat water.
If the water reaches an confortable temp i really want to make some aquaponics above the tank and raised compost heap. To make up for taken space and to grow lettuce in winter.
-direct heat from compost in the soil.
-radiant heat from water heated by the compost.
(-aquaponics with heated water, if its an comfortabele temp for some type of fish)
Remember, compost will heat your greenhouse day and nigth. In victorian times the English royal family even ate pineapple from an growbed called the pineapple pit. Heated with manure with straw in winter.
I'm sorry for the data overload. I really want to inform people about heating your greenhouse with compost. Might save you some money on investments and electricity.
Thank you friend from the cozy polly tunnel........
Put large plastic bottles full of water in there with lid closed , they heat up in the day and produce heat at nighttime 👍🏻💚
Put a couple 55gal drums painted black and filled with water at each end for a passive heat source
Thank you! I went the electric route and am using a 1500 watt oil-filled radiator heater and a few fans to circulate the air. As long as the outside temperature is above -3 F, I can keep my 5' x 5' x 6' PE greenhouse above freezing. I have 10 gallons of water hiding around the space where it can get sunshine during the day, and the north side is insulated with a double layer canvas drop cloth. I found your video because I'm looking for ways to keep the greenhouse warm without running the space heater for 9 hours to 20 hours per day depending upon the amount of sunshine there is in the daytime.
I live in the deep south where it is not bitter at night. when temps are forecast to be below freezing I connect a small oscillating ceramic heater to a timer. this works really well.
Food for thought, thank you
made a two layer with frame outside and kinda hoop inside making " air gap and an air lock style door also black water barrels worked well was thinking rammed earth wall as a thermal mass or rocket furnace for cold nights maybe
Is it still getting sunshine? With all those covers looks like sun is somewhat blocked...
interesting video, thanks for sharing your endeavor. I was thinking number 3 at the end 2:54 would have been best solution.
Thank you for taking the time to comment! Much appreciated.
1 more easy step would be to put a clear storage box over the plants for another layer of protection
I use the bricks from old storage heaters. The soak up heat through the day and slowly release it through the night.
am trying this for 1st time this week with our 1st frost crazy late @ 8th December. Few weeks back moving neighbour kindly gave me her stash of 100+ iron oxide sintered bricks designed to store heat & release slowly. Have only placed 10 so far. Fingers crossed. -5c at night but no frost damage yet to tender plants in poly tunnel.
Composting bins with insulated walls that have duct work to draft cold air through the bins and push heated air out into the green house.
Check out how BioGreen greenhouse heaters can keep the cold out in winter
A double layer system to keep an insulating layer of air between the inside and outside that works off drafting using heat from cimposting bins. 😊
...the double layer of Polly will insulate and resist wind gusts much better as a side perk...I added sheet foam to end caps and betweetperlins just remove in morning for the sun...
Taman Inspirasi sayang tanamanmu
What is a water butt?
Geothermal.... Tubes network in the earth or in massive compost pile...if calculated right never fails. Lemons in Nebraska.
The citrus in Nebraska greenhouse did something very similar, but you wouldn't want to do that with a hoop greenhouse because that doesn't have sufficient insulation on the top end.
I`ve never had any trouble keeping my greenhouse warm in winter or cool in the summer. I dont like bubblewrap, it looks really naff :)
How do you do it?
Add a reptile heat lamp!
Very inefficient compared to using a similar wattage heater.
Have a container full of some salt which is cheap and have a parabolic mirror which is really cheap on it during the day. At night just take it in the green house and put something on top like a clay pot to cover and help radiate the heat from the molten salt.
Sounds interesting, please post a video about it!
Less "How To Keep" and more "use lots of bubble wrap to try to" Maybe try moving the rain barrels inside to act as thermal storage and drill down below the frost line to install air-heat-exchange to heat the inside?
I have 15 of 10 gallon water-filled buckets stacked inside against the N wall. All painted black on the south side. Books say that water gallons of inside storage should be 3 times the square footage of the solar sheeting on the south side--northern hemisphere.. Smaller buckets will 'flywheel' faster than bigger buckets. Thanks for all the ideas you show