STUDY OF LOW-GRADE WASTE HEAT RECOVERY

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TUDY OF LOW-GRADE WASTE HEAT RECOVERY ( tudy-low-grade-waste-heat-recovery )

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building model can be built using one of several software suites to determine the building heating loads. A similar type of analysis can be done to determine the amount of energy required to maintain the temperature of the bead room at a maximum temperature of 75°F year round. This can also be estimated by using the same spreadsheet cooling load model and results in a design cooling load of the room to be around 7 tons while the installed capacity is 8 tons. The spreadsheet calculation used several assumptions and the 8 ton value is taken to be correct. However, as mentioned earlier, the smallest capacity absorption chiller commercially available is 10 tons which will be the capacity installed. To supply cold air to the room from the waste heat source, an absorption chiller must be used. Because of this, the coefficient of performance for the chiller must also be considered. To develop a first round estimate, a value for the COP is estimated based on the average values discussed earlier and product literature to be 0.7. QWH =CCxK1 /COPxK2 = 10 tons cooling x 12,000 Btu/hr/ton / 0.7 x 1 MMBtu/ 106 Btu = 0.17 MMBtu/hr where QWH = required waste heat input to the chiller CC = design system cooling capacity K1 = conversion from tons of cooling to Btu/hr COP = coefficient of performance, assumed based on average data K2 = conversion from Btu to MMBtu 91

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