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The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is - 20^@ C, the temperature of the surroundings to which it rejects heat is _____ |
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Answer» `21^@C` `=T_L/(T_H-T_L)` where `T_L` = lower temperature in K `T_H`=HIGHER temperature in K `therefore 5=T_L/(T_H-T_L)` `therefore 5T_H-5T_L=T_L` `therefore 5T_H=6T_L` `=6/5xx(273-20)` `=6/5xx253` =303.6 K `therefore T_H`=303.6-273=`30.6^@C approx 31^@C` |
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