An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 30°C by rejecting the waste heat to the outdoor air at 50°C. The room gains heat through the walls and the windows at a rate of 350 kJ/min while the heat generated by the computer, TV, and lights amounts to 1000 W. The refrigerant enters the compressor at 400 kPa as a saturated vapor at a rate of 120 L/min and leaves at 1400 kPa and 70°C. Determine: (a)        the actual COP,   (b)       the maximum COP, and                                                                         (c)        the minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions.

An electric water heater is fed with an input stream of 15.0 kg/min of water at 17.5°C. Hot water is then provided as two different output streams, one at 43.0°C and the other at 60.0°C. The volume of the water in the tank remains constant and the mass flowrate of the outlet stream at 43.0°C is 10.5 kg/min. Perform the following activities, i. Draw a detailed flowchart for this process with all given information. ii. Calculate the power, Q (in kW) that the electric heater must provide in order to keep the temperatures of the outlet streams at 43.0°C and at 60.0°C, respectively. You must write the mass and energy balances and show your calculation. Given: AH + AĖK + AĖ, = Q – W, where AH stands for the difference in enthalpy; ΔΗ- ΣΗoal -ΣΗit ial s As AH = H; – H,ref = mC,(T; – Tref), if the reference temperature Tref is selected as 0°C, the absolute enthalpy is given by AH¡ = H¡ = mC,T- %3D - %3D k] The specific heat of water is constant and is 4.182 within the range of kgºC temperature…

Compressor as the core part of a domestic air conditioner is using Refrigerant-134a as ns working fluid. The refrigerant enters the compressor at 140 kPa and –13°C with the required power input of 120 kW, and it is compressed to the condenser pressure and temperature of 1000 kPa and 60°C respectively. Evaluate if the adiabatic compressor is able to deliver compressed air at a minimum rate of 5 kg/s. Justify your answer with relevant calculations.

Refrigerant-134a at a rate of 0.08 kg/s enters the compressor of a refrigerator as superheated vapor at 0.18 MPa and 0 ℃ and leaves at 0.9 MPa and 80 ℃. The refrigerant is cooled in the condenser to 31.3 ℃ and 0.8 MPa and it is throttled to 0.18 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, a) Show the cycle on a T-S diagram b) Determine the rate of heat removal from the refrigerated space and the power input to the compressor c) Determine the adiabatic efficiency of the compressor d) Determine the coefficient of performance of the refrigerator.

When a man returns to his well-sealed house on a summer day, he finds that the house is at 35°C. He turns on the air conditioner, which cools the entire house to 20°C in 36 min. If the COP of the air-conditioning system is 2.8, determine the power drawn by the air conditioner. Assume the entire mass within the house is equivalent to 800 kg of air for which cy= 0.72 kJ/kg °C and cp = 1.0 kJ/kg-°C. 35°C 20°C W A/C The power drawn by the air conditioner is kW.