Greenhouse Insulation & Design:
We typically recommend having as much insulation and energy efficiency in greenhouse design as possible, to increase the capability of PCM cycling. Hoop house / poly type greenhouses for instance, can sometimes be challenging to get enough heat in winter to melt PCM. They also suffer from significant heat loss compared to more passive solar greenhouse designs.
How Much PCM is Enough?
Many greenhouses suffer from significant heat loss in winter. PCM can be used to extend of improve the growing season, or can be used to help reduce how much energy is using to maintain growing conditions.
A typical Templok™ tile contains 100 btu’s of thermal storage potential per square foot. Or 2,500 joules per m2.
Therefore, a case of (x10) tiles is equal to:
- 4,000 btu’s
- 4,200 kJ
- 1,172 Watthours
Templok™-AIR Duct System:
Insolcorp offers a standard sized duct unit which can be co-ordinated with your project. This unit is 24″x24″x48″ in size, and can be linked to a 500 to 750cfm fan (by others). For more customized approaches, talk with our team and we’ll help you design the right solution.
A 24″x24″x48″ unit will typically provide the following energy outputs
- 6,000btu/h Output
- Average 10ºF drop or rise in temperature with 500cfm of air flow.
- Average 36,000 btu’s (3 tons, 10kWh) of total energy storage per day,
PCM vs Water Storage
Assuming a temperature difference (Delta-T) of 20ºC or 36ºF, a 55 gallon drum of water could store approximately 9,000 to 10,000 btu’s of thermal energy. However this energy would not be concentrated at any one temperature, and would instead be evenly distributed across all temperature ranges.
With just 24 Templok™ tiles, the same amount of energy could be stored. However the PCM in Templok ensures this energy is concentrated at a much narrower range. Helping keep greenhouse and grow-houses closer to target temperature.
Furthermore, the 1/4″ thick profile of Templok helps significantly improve thermal conductivity compared to the slow process of extracting energy from a large water barrel.
The result? A more efficient storage solution that takes up ZERO growing floor space.