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The table below contains mass flow rate, cooling capacity, and power consumption as a function of evap- orator and condenser temperatures for a hermetic rotary
The table below contains mass flow rate, cooling capacity, and power consumption as a function of evap- orator and condenser temperatures for a hermetic rotary compressor using the refrigerant R-22. This compressor has a displacement of 19.1 cm and it operates at 3600 rpm. The compressor superheat is 20 F and condenser subcooling is 10 F. Table 1: R-22 Rotary Compressor Performance Data Tcond FI Tevap El Mdot [ibm/hr) 1.56 Qdot [Btu/hr) 13040 100 35 110 35 154 12325 1 1 W clot [W] 860 1 985 I 1105 1 1225 1 1340 860 120 35 151 11610 10900 130 3.5 148 140 35 145 10200 100 45 192 15880 110 45 189 1.5030 995 120 130 185 182 14175 13315 1125 1255 1 178 1 1385 140 100 45 45 55 55 234 850 1 1 | 1 110 231 995 1 120 1 12415 19175 1 18195 . 17195 1 16170 1 15120 l 1 1 1 227 1110 55 223 130 110 1285 1425 | 55 1 219 3. The values in the table below were generated at a superheat of 20F. Considering that the actual superheat is at 10F, correct the map-based mass flow rate and power consumption for a condensing temperature of 120 F and an evaporation temperature of 35 F. 4. Determine the compressor discharge temperature for conditions of part 3 assuming that the ratio of heat loss to power requirement, fo, is 0.2. 5. Based upon the performance characteristics of this compressor, estimate the required compressor displacement that would be necessary to achieve a cooling capacity of 2 tons (24,000 Btu/hr) at an evaporating temperature of 40F and a condensing temperature of 115 F with a superheat of 10 F and subcooling of 10 F. The table below contains mass flow rate, cooling capacity, and power consumption as a function of evap- orator and condenser temperatures for a hermetic rotary compressor using the refrigerant R-22. This compressor has a displacement of 19.1 cm and it operates at 3600 rpm. The compressor superheat is 20 F and condenser subcooling is 10 F. Table 1: R-22 Rotary Compressor Performance Data Tcond FI Tevap El Mdot [ibm/hr) 1.56 Qdot [Btu/hr) 13040 100 35 110 35 154 12325 1 1 W clot [W] 860 1 985 I 1105 1 1225 1 1340 860 120 35 151 11610 10900 130 3.5 148 140 35 145 10200 100 45 192 15880 110 45 189 1.5030 995 120 130 185 182 14175 13315 1125 1255 1 178 1 1385 140 100 45 45 55 55 234 850 1 1 | 1 110 231 995 1 120 1 12415 19175 1 18195 . 17195 1 16170 1 15120 l 1 1 1 227 1110 55 223 130 110 1285 1425 | 55 1 219 3. The values in the table below were generated at a superheat of 20F. Considering that the actual superheat is at 10F, correct the map-based mass flow rate and power consumption for a condensing temperature of 120 F and an evaporation temperature of 35 F. 4. Determine the compressor discharge temperature for conditions of part 3 assuming that the ratio of heat loss to power requirement, fo, is 0.2. 5. Based upon the performance characteristics of this compressor, estimate the required compressor displacement that would be necessary to achieve a cooling capacity of 2 tons (24,000 Btu/hr) at an evaporating temperature of 40F and a condensing temperature of 115 F with a superheat of 10 F and subcooling of 10 F
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