When compiling loads, the "full" conference center (bodies plus facility loads-lights, transmission, ventilation, etc.) plus about 125 BTU per person sensible and 175 BTU per person latent for dining loads added to general physical loads (transmission and lighting) will likely be the maximum total load.
Room loads will be less than this, even when fully occupied in evening.
Best design process is the compute the peak loads expected for overall area as noted above, then do an overall hourly load calculation and add up total daily ton-hours. Select a high efficiency cooling chiller based on the 60% of the average daily ton-hour load (using 48F supply temperature and 60F return temperature).
Then, install a second chiller (or chillers) that will be high efficiency with either 75F condenser water or air cooled (assuming average 70-75F minimum night temperatures) and 48F return water and 28F chilled water supply to use for Ice Making thermal storage at night (the utility's official "off-peak" hours). The stored ice will be used to cool the 48F chilled water down to 40F for distribution (giving an 20F overall circulation sizing to keep pumps and piping sizes down) and assuring good control of latent loads in high occupied areas.
The ice storage capacity will be equal to about the same 60% of the average peak daily cooling load. Ideally, the ice will be melted each day and the chillers will only run to support the non-ice loads. By running the chillers based on maintaining the 60F return water temperature, the total daily on-peak load will be as low as possible.
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HVAC Cooling Loads
Re: HVAC
