Chapter 7, Problem 7.29P

Please give a detailed solution and each clearly

The vapour compression cycle below (Figure Q4) utilises the refrigerant R134a flowing at 0.05 kg s¹. Assuming that the compression is adiabatic and reversible. If the actual input power to the compressor is 2 kW, determine the following: a. The theoretical input power to the compressor and the heat transfer (4) to the evaporator. Take the enthalpies h₁, h₂, and h3 to be 238.41, 263.68 and 81.5 kJ kg-¹, respectively. b. The coefficient of performance (COP) based on your answer to (a). c. The compressors mechanical efficiency. d. The COP based on the actual power input. P @ 5.673 bar 3 T @ 15 °C 4 P @ 0.8071 bar T@ -35 °C Warm condenser Cold evaporator Dout Din 2 P@ 5.673 bar T @ 50 °C Compressor 1 P@ 0.8071 bar T@ -20 °C

A one-stage compressor takes air at 100kpa and 25C with volume flow of 0.123m3/s and discharges to 800kpa. What is the heat rejected(kw) by the intercooler?

A flow of 3 kg/s of superheated steam at 300 kPa and 300°C is mixed with liquid water at 300 kPa and 90°C so that the output is a flow of saturated steam at 300 kPa. Assume the mixing chamber is insulated, find the flow rate of liquid water needed for the process.

where do thet get the enthropy valvue for S2?

When steam expands through a nozzle from a pressure of 300 psia to 5 psia, with initial enthalpy 923486 lbf-ft/lb then final enthalpy 809898 lbf-ft/lb. Find the velocity at the exit in ft/s if there is no change in PE, velocity of 0 ft/s at the inlet, and no heat is lost through the casing.

do not approximate the numbers you get from the tables write it as it

A two-stage air compressor has an intercooler between the twostages, as shown in Figure. The inlet state is 100 kPa, 290 K, andthe final exit pressure is 1.6 MPa. Assume that the constantpressure intercooler cools the air to the inlet temperature, T3 = T1.It can be shown that the optimal pressure is P2 = (P1P4)1/2 forminimum total compressor work. Find the specific compressorworks and the intercooler heat transfer for the optimal P2.

4. During the execution of a reversible non-flow process the work is -156.2 KJ if VI=0.845 and the pressure varies as P=-730 V +690 KPa, where volume V is in m?