A building requires a 2-ton heat pump for maintaining the interior space at 27°C when the outside temperature is 5°C. The heat pump operates on the normal vapor compression refrigeration cycle and uses refrigerant-134a as the working fluid. The heat pump operating conditions require an evaporator pressure of 240, kPa and a condenser pressure of 1600 kPa while the compressor has an isentropic efficiency of 85 percent. Selected data for refrigerant-134a are provided in the table below.
P, kPa | Tsat, °C | hf, kJ/kg | hg, kJ/kg | Sg, kJ/kg•K |
240 | ‒5.37 | 43 | 244 | 0.9222 |
1600 | 57.92 | 134 | 275 | 0.8982 |
For R-134a at P = 1600 kPa and s = 0.9222 kJ/kg•K, h = 285 kJ/kg. Also, 1 ton = 211 kJ/min.
(a) Sketch the hardware and the T-s diagram for this heat pump system.
(b) Determine the power required to drive the heat pump, in kW and the COP.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.