Are you referring to the tables in the eplusout.html for site/source energy? In which case that is the *electricity* consumption used by a heat rejection device such as a cooling tower or fluid (dry) cooler. In the case of a cooling tower that's mostly to run the fan (and potentially the basin heater for water operation), most of the work is done by water evaporation so logically it will appear small on a kWh (or BTU) basis.
If you think about a one room model cooled by water cooler chiller and cooling tower: the cooling load is the amount of energy that needs to be removed From the room to get the required temperature setpoint. The chiller will work to do so and consume electricity (much less, since the COP of the chiller is typically between 4-10. Then the cooling tower has to disperse this heat load + the chiller's compressor heat (and some pump heat load too) and will consume both electricity and water.
Hope that overly simplified explanation is helpful
Julien
Envoyé de mon iPhone
Le 2 oct. 2016 à 12:49, "keivan bamdad keivan.bamdad@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> a écrit :
Hi folks,Does anyone know what heat rejection is? It is said that it is for Cooling Tower, but the amount of heat that cooling tower rejects to the atmosphere is a lot, so why its value is very small in the output of EnergyPlus? what is the difference between heat rejection and cooling loads?I highly appreciate your response.Best regards,Kev
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Posted by: Julien MARREC <julien.marrec@xxxxxxxxx>
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