Chapter 8, Problem 8.87P

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Steam engine with incomplete expansion receives saturated steam at 1.04 Mpa,expands it to 0.105 Mpa where release occurs. Exhaust is to a condenser at 40C.The actual engine uses 6070 kg/h of steam; it has a brake engine efficiency of 60%and a mechanical efficiency of 85%. The electric generator which it drives has anefficiency of 925. (a) For the ideal engine, find the thermal efficiency and the mep.For the actual engine, determine (b) the brake work in kW and the brake thermalefficiency, (c) the indicated work in kW, indicated thermal efficiency and indicatedsteam rate, (d) the combined thermal efficiency and the combined steam rate

A small power plant produces 25 kg/s steam at 3 MPa, 600 degrees Celsius in the boiler. It cools the condenser with the ocean water coming in at 12 degrees Celsius and returning at 15 degrees Celsius so the condenser exit is at 45 degrees Celsius. Find the net power output and the required mass flow rate of ocean water.

In a certain steam plant the turbine develops 703.72 kJ/kg. The heat supplied to the steam in the boiler is 2800 kJ/kg, the heat rejected by the steam to the cooling water in he condenser is 2100 kJ/kg and the network of the cycle is -995 kW. Calculate the pump work in kJ/kg and steam flow rate.

In the open-circuit steam plant, boiler feed water at atmospheric pressure 1 bar and 35oC is pumped into an oil-fired boiler which produces dry-saturated steam at 10 bar. This steam enters a steam turbine and is expanded isentropic ally to atmospheric pressure and freely discharged into the atmosphere. Find The thermal efficiency of the plant. The work ratio The specific steam consumption

A refrigerator cycle uses refrigerant R-134a and operates between a low-side pressure of 1.5 Bar and high side of 10 Bar. The power input to the compressor 1.88 Kw. find the refrigerant mass flow rate, condensing heat load, and COP of this machine

R-134a as a refrigerant, in a cooling machine used; refrigerant to evaporator (evaporator) 0.15 drynessIt enters with a temperature of -12oC and a flow rate of 0.028 kg/s and leaves the evaporator as saturated steam. cooling machineSince it works according to the reverse Carnot cycle and the compressor consumes 1.45 kW of power a) Find the efficiency coefficient of the cooling machine. b) Calculate the heat given to the outside environment c) Calculate the condenser temperature

Q 2: - A one cylinders Freon (134a) compressor has a Bore and Stroke 5.4 and 4.8 cm respectively. It is speed 1450 rpm volumetric efficiency c.v 100% working fluid reaches expansion valve at 42°C and the temperature %3D of its suction -8°C:- a- Find the mass flow rate of the refrigerant, heat capacity and COPact& COPtho? b- Find the mass flow rate of the refrigerant, heat capacity and COP & COPtho if the clearance factor will be 5%?

R-134a as a refrigerant, in a cooling machine used; refrigerant to evaporator (evaporator) 0.15 drynessIt enters with a temperature of -12 oC and a flow rate of 0.028 kg/s and leaves the evaporator as saturated steam. cooling machineSince it works according to the reverse Carnot cycle and the compressor consumes 1.45 kW of power a) Find the efficiency coefficient of the cooling machine. b) Calculate the heat given to the outside environment c) Calculate the condenser temperature