Calculating Glasshouse Heat: A Question from CJ

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SUMMARY

Calculating the temperature inside a glasshouse requires understanding the energy balance between incoming sunlight and outgoing heat. Key factors include the properties of the glass, which affect heat retention and loss. Warren suggests using specific software to calculate heat flux, which can be adapted to determine the temperature at which heat flux equals zero. This method involves trial and error to find the equilibrium temperature.

PREREQUISITES
  • Understanding of greenhouse energy dynamics
  • Knowledge of glass properties affecting thermal performance
  • Familiarity with heat flux calculations
  • Basic principles of thermodynamics
NEXT STEPS
  • Research software options for heat flux calculations in greenhouses
  • Explore the thermal properties of different types of glass
  • Study methods for measuring energy input from sunlight
  • Learn about thermal equilibrium and its applications in greenhouse design
USEFUL FOR

Greenhouse designers, agricultural engineers, and anyone involved in optimizing climate control in glasshouses will benefit from this discussion.

CyberJay
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Hi
Can anybody tell me if there is a way to work out how hot it gets in a glasshouse?
I realize it would depend on the properties of the glass but I don't know that either. Which properties do what?
thanks guys
CJ
 
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Find the energy going into the greenhouse -- i.e., from sunlight through the glass roof.

Find the amount of energy that leaves the greenhouse as a function of temperature -- i.e. from heat rerediated through the glass, and absorbed by the earth, and lost through the walls.

Solve for the temperature that makes them equal.

- Warren
 
I use THIS software. It does the opposite of what you are asking: it calculates the heat flux for a given set of conditions. It wouldn't be too tough to use trial and error to find the temperature at which the heat flux is zero.
 

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