Chapter 5, Problem 5.46P

A carnot heat pump is operating to keep a room at 20C. The unit is taking in air from a -30C location. If it is pulling 5kW from the -30C location, what is the power input required to do this and how much heat is delivered to the 20C room?

Find the required work to transfer 1200j of heat from the sink(cold body)-90°c source (hot body)at 35°c in the case of refrigerator

Find out the COP of a Carnot heat pump operating between temperatures 6o C and 37o C.

A tank of water has a shaft rotating at 60 rpm with a torque of 40 N-m that is stiring the water. A heater is also present that operates at 120V and draws 4A of current. Heat is then removed from the water such the the total energy content of hte water is constant. How much heat is removed?

An air conditioner using refrigerant 134a as work fluid It is used to keep the temperature of a room at 23 ° C by giving heat to the environment. The house from the walls and heat gain from windows is 250 kJ / min ; 900 W of heat from computer, TV and lamps to the room spreads. The refrigerant is 100 L / min in the form of saturated vapor at 400 kPa pressure to the compressor entering with flow and it left from the compressor 1200 kPa pressure and 70 ° C. a) real COP value b) max COP value c) Calculate the min volumetric flow rate for the refrigerant can have for the same compressor inlet and outlet conditions

A refrigeration system operates an ideal vapor compression using R-143a with an evaporator temperature of-30°C and the condenser exist temperature of 50°C and requires 75 KW motor to drive the compression. What is the cooling capacity of the refrigerator in KW? And find COP.

It has been suggested that a building could be heated by a refrigeration engine operating in a Carnot cycle. The engine takes heat from the outside at 280 K and delivers heat to the building a 295 K. How much work would have to be done for every kilo joule heat delivered to the   building?

I need the answer as soon as possible

A water cooler for drinking water should cool 25 L/h water from 18 C to 10 C while the water reservoirs also gains 60 W from heat transfer. Assume that a small refrigeration unit with a COP of 2.5 does the cooling. Find the power input to the unit.