2 A building cooling temperatures for summer and winter to be 95 and 0°F, respec

Question

2 A building cooling temperatures for summer and winter to be 95 and 0°F, respectively. Determine (a) the relative supply air, if the air is supplied at 60°F. (b) th degree days, HDD 6493 and cooling degree days, CDD 985 with -0.78 for summer an and n 0.6 for winter and 2.5 for the summer, determine if the gas costs $ 0.75/therm and electricity costs $0.12/kWh. 1 therm -100,000 Btu located in Chicago is maintained at 750F and rh-50% throu ghout the year has a total peak humidity of load of 15 tons with SHR value of 0.8 and a peak heating load of 10 tons. Assume the design heating load o e tonnage capacity of the A/C equipment (c) Assuming the heating d 0.67 for winter the yearly cost of heating and cooling of the building, 300 cfm Return Fan A/C Space at Supply Fan

Explanation / Answer

The CLTD/CLF/SCL (cooling load temperature difference/cooling load factor/solar cooling load factor) cooling load calculation method was first introduced in the 1979 ASHRAE Cooling and Heating Load Manual (GRP-158) [1] The CLTD/CLF/SCL Method is regarded as a reasonably accurate approximation of the total heat gains through a building envelope for the purposes of sizing HVAC equipment. This method was developed as a simpler calculation alternative to difficult and unwieldy calculation methods such as the transfer function method and the Sol-air temperature method.[2] Error when using the CLTD/CLF/SCL method tends to be less than twenty percent over and less than ten percent under.[1]

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