Chapter 7, Problem 7.17P

A condenser (heat exchanger) brings 1 kg/s water flow at 10 kPa quality 95% to saturated liquid at 10 kPa. The cooling is done by lake water at 20 degree Celsius that returns to the lake at 30 degree Celsius. For an insulated condenser, find the flow rate of cooling water.

where do thet get the enthropy valvue for S2?

A closed constant volume system receives 10.5 kJ of paddle work. The system contains oxygen at 344 kPa, 278 K and 0.06 m3. Find the heat loss if the final temperature is 400 K.

9. An air compressor takes in air at 105 Pa and 27°C having volume of 1.5 m3/kg and compresses it to 4.5×105 Pa. Find the work done, heat transfer and change in internal energy if the compression is isothermal.

I do not understand the chapter in general. May you please explain why you completed each step as you have. Thank you.

The power required for the compressor, to handle air adiabatically from 101.325kPaa and 300 °K to 305 kPaa, 2550 Hp. The inlet velocity is 21 m/s and the dischargevelocity of air is 85 m/s. a) If the process is isentropic, find the volume of air handles,in lps, measured at inlet conditions. b) If the compression is irreversible adiabatic totemperature 157.5 °C, with the capacity obtained in a), find the power input.

40°C 4. A mixing chamber receives 5 kg/min of ammonia as saturated liquid at -20°C from one line (1) and ammonia at 40°C, 250 kPa from another line (2). The chamber also receives 325 kJ/min of energy as heat transferred from a 40°C reservoir as shown in figure. At the outlet, ammonia leaves as saturated vapor at -20°C. Find the mass flow rate in second line and calculate the total entropy generation in the process. Is this process possible?

Two-stage compressor that has an intercooler takes in air at 300 K, 100 kPa, and compresses it at 2.2 MPa. The cooler then reduces the air temperature to 340 K, after which it enters the second stage, where it has an outlet pressure of 15.0 MPa. Both stages are adiabatic and reversible. Determine a) Find the heat q in the cooler b) The total specific work

A reciprocating air compressor taken in 2m3/min air at 0.11MPa, 293K which it delivers at 1.5 Mpa, 384 K to an after cooler where the air where the air is cooled at constant pressure to 298 K. the power absorbed by the compressor is 4.15 kW. Determine the heat transfer in (i) the compressor (ii) the cooler. State your assumptions.