**Understanding Heat Pump Performance****Section 6-102**The performance of a heat pump decreases (i.e., its Coefficient of Performance, COP, decreases) as the temperature of the heat source decreases. This makes using heat pumps at locations with severe weather conditions unattractive. Consider a house that is heated and maintained at 20°C by a heat pump during the winter. What is the maximum COP for this heat pump if heat is extracted from the outdoor air at:- (a) 10°C- (b) -5°C- (c) -30°C?

a) Given: House is maintained at a temperature T1=20°C=293 K Heat extracted from outdoor air at…

Answered: 6–102 The performance of a heat pump…

Similar questions

You are hired to build a geothermal power plant that absorbs heat from a hot water spring and discards heat into the surrounding air, which is at a temperature of 17°. The plant is designed for a maximum (Carnot) efficiency of 0.21. What is the temperature, in degrees Celsius, of the hot water gushing from the spring? If the rate of energy supplied to the plant by the hot-water source is 4.6 kW, what is the plant’s maximum rate of power output, in kilowatts?
On a warm Summer day, a student turns on the fan in his room in the morning and leaves it running. When he returns in the afternoon: Will the room be warmer or cooler than the adjacent rooms? Why? Assume that the windows and doors of the room remain closed and that the walls of the room are adiabatic.
A hollow drinking straw is placed in a glass of warm water. Suppose that some of the water started to climb to the top of the straw and cooled down so that the increase in potential energy was balanced by a loss of heat. Which law of thermodynamics forbids this from happening? (A) The 0th law (B) The 1st law (C) The 2nd law (D) The 3rd law
(a) For the atmosphere, write down an expression for the first law of thermodynamics for an adiabatic process. (b) Write down an expression for change of internal energy of a system in a constant-volume (isosteric) process. (c) Determine the specific internal energy change and the work done during an isosteric cooling from 0°C to -10°C. (d)Determine the pressure level attained when a system expands adiabatically in the atmosphere from 1000 mb and temperature falls from 0°C to -10°C.
(a) When the steam engine is running between 120°C and 30°C, how many Js of calories are there in the heat source to get 1000 Js of work? (b) When an ideal gas with Cp=5 cal/(mol·K) is compressed to 25°C, and 10°C through an adiabatic and reversible process, what is the final temperature of the gas? (c) In an ideal gas turbine power device, the pressure ratio is 6, the temperature entering the compressor is 27°C, and the maximum allowable temperature of the turbine is 816°C. What is the efficiency of this power device when it is carried out in reversible operation? However, the specific ratio is 1.4.
A heat engine is being designed to have a Carnot efficiency of 60% when operating between two heat reservoirs. (a) If the temperature of the cold reservoir is 20°C, what must be the temperature of the hot reservoir? °C (b) Can the actual efficiency of the engine be equal to 60%? O Yes O No Explain your answer.
You put heat energy into your car and it does not work . The difference between what you put in and the work it does is the change in internal energy of your car's "system." This is an example of which law of thermodynamics?