a refrigerator maintains a temperature of 0°c in the cold compartment with a room temperature of 25.0°c. it removes energy from the cold compartment at the rate 8 000 kj/h. (a) what minimum power is required to operate the refrigerator? (b) at what rate does the refrigerator exhaust energy into the room?

A heat pump is used for warming a house during winter and cooling it over summer. The temperature inside the house is set to 19o C during winter and 24o C during summer. The heat is transferred through the house walls and is estimated to be 2200 kJ/hro C. During winter, the outside temperature is 2o C. What is the maximal power required to operate the pump engine? Using the maximal power obtained for (a) to cool down the house during summer. If the house temperature should be maintained on 24o C, what will be the maximum temperature outside?

A refrigerator is removing .25 heat from a cold medium at 3°C at a rate of 7200 kJ/h and rejecting the waste heat to a medium at 30°C. If the coefficient of performance of the refrigerator is 2, the power consumed by the refrigerator is

A "cold room" used for low-temperature research is maintained at a constant temperature of 7.00°C. The refrigeration unit vents to outdoor air which is at 27.0°C. The rate at which energy is exhausted to the outdoors is 18.0 kW. The coefficient of performance (COP) of the refrigeration unit is equal to 40.0% of the COP of an ideal Carnot refrigerator. (a) At what rate (in kW) does the refrigeration unit remove energy from the room? (Round your answer to at least two decimal places.) kW (b) What is the power input (in kW) required by the refrigeration unit? kW (c) What is the entropy change of the Universe (in J/K) produced by the refrigeration unit after it operates for 3.00 h? J/K (d) If the outside temperature increases to 33.0°C, what is the percent change in the COP of the refrigeration unit? (Include the sign of the value in your answer.) % Need Help? Read It