How do you calculate cooling energy?

Answer 1

That's a big question. Do you mean how much cooling is required, or how much energy is required to cool something?

Required cooling involves calculating the heat leaks into the cooled space. This could involve solar loading, the heat leak through a wall or a window. Maybe it's the structural supports that hold up a detector at cryogenic temperatures. Typically you know something about how the amount of the heat leak varies with the temperature at its two sides. House insulation and windows have an R value that tells you how much heat leaks through as a function of the internal and external temperatures.

Once you know the load, you can calculate the amount of energy required to provide that much cooling. An air conditioner sold in the United States will have an "Energy Efficiency Rating" that tells how many BTUs/hr of cooling are produced per watt of electrical power input. So if you need 5000 BTU of cooling and your A.C. has an EER of 10, you will need 5000/10 = 500 W of electrical power to run it.

In a country that uses a sensible unit system the cooling requirement and the electrical power are both measured in Watts, so an A.C. will simply have a coefficient of performance (COP) which is the Watts of cooling per Watt of electrical power. COPs for typical air conditioners is about 3, so in the above example you would have calculated that you needed 1450 W of cooling, and with a COP of 3 you would need 480 W.

Answer 2

There are many factors to consider in calculating heat gain (cooling) and heat loss (heating) for a house. Such as: # and type of windows, which direction those windows face, available tree or other shade, tightness of the home, design winter,summer outdoor conditions, desired indoor winter/summer temps, house size,# of floors. Too many more to mention. There are several programs one can download (for a license fee) in order to do this calculation. It is a sizable undertaking for a novice and is best left to a pro but it can be done. Do a Google search on HVAC-Calc and try the free trial for a better idea of what I`m talking about.

Answer 3

Cooling tower efficiency is calculated by taking the temperature at various points of the environment that the tower is supposed to be cooling. If the temperature is high then the tower is not being very efficient.

Answer 4

(Useful energy that comes out) = (total energy that goes in) times (conversion efficiency)

or

(Useful energy that comes out) = (total energy that goes in) minus (energy lost in conversion)

Answer 5

Required temperature -10degree centigrade to +5 degree centigrade.

Total floor area 14000 square feet

Building type 7 story building