Re: [EnergyPlus_Support] Condenser Cooling Energy

Sajal,

It is almost impossible to say that everything is identical between the simulations because you are using different technology for your condensers.Â Each of those three options has very different part load performance!Â

In the case of the water and evaporatively-cooled condensers, the climate (specifically the humidity pattern) file will also have a big effect.

Part load performance is a complex topic which requires some extra study. If you want to compare specific equipment (i.e., specific manufacturer and model), then you need to obtain the part load performance values for the exact equipment. If you are conducting a generalized comparison and you have used default curves values for part-load performance, then you probably see big influence on efficiency / power as outdoor humidity varies.Â The "winner" may vary in a dry climate compared to a humid climate. I'm guessing that you have used a fairly dry climate because the water-cooled system is the current "winner".

One more factor to consider is the water consumption and maintenance. I live in a place that has plentiful fresh water with fairly low cost, but that's not true everywhere. In addition, water-cooled systems generally require more maintenance and thus have higher life cycle costs than air-cooled systems.

On Thu, Jul 7, 2016 at 12:17 AM, Sajal Chowdhury sajal_c@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Â

Dear All,
I have simulated HVAC: PTHP+Fan-Coil with chilled water loop and plant : chiller. I used 3 types of condenser i. water cooled, ii. evaporatively cooled and iii. air cooled. I found in all situations water cooled condenser type gave low cooling energy/electricity in all case than others condenser type. Can anybody help me to discuss why this happen and whats the logic? It may be noted here that the others conditions and parameters are same for the both simulations. Thank you and waiting for the discussion.Â
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Sajal Chowdhury
B.Arch.(BUET), M.Arch.(BUET), M.Eng.(HU,Japan)C.

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