12Q.10 A cyclic heat engine operates between a source temperature of 723°C and sink temperature of23°C. What is the least rate of heat rejection per kW net output of the engine? Also show the blockdiagram.

As per given question Source temperature =723°c Sink temperature =23°c We have to determine net…

Answered: 12 Q.10 A cyclic heat engine operates…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Heat transferred from the higher and lower temperature reservoirs are and , respectively. Select the coefficient of performance for a heat pump___________ A. 0.67 B. 0.5 C. 1.5 D. 2.0
THA= 31 Celcius Degree TLA= 8 Celcius Degree QLA= 72 kW WA= 12 kW THB= 33 Celcius Degree TLB= 4 Celcius Degree QLB= 36 kW WB= 6 kW
Suppose a heat engine absorbs 10.0 kJ of heat from a hightemperature source at Th = 450 K and discards heat to a lowtemperature reservoir at Tl=350 K. Calculate the thermodynamic efficiency, e, of conversion of heat to work; the amount of work performed, -wnet; and the amount of heat discharged at Tl , qCD.
Thermodynamics
28
Q.5 A vapour compression heat pump is driven by a power cycle having a thermal efficiency of 25% for the heat pump, refrigerant 12 is compressed from saturated vapour at 2 bar to consenser pressure 12 bar. The isentropic efficiency of compressor is 80% saturated liquid entors the expansion value of 12 bar for power cycle 80% of the neat rejected by it is transferred to the heated space which has total heating requirement of 500 kJ/min. Determine the power input to heat pump compressor F 12 properties are
B- A steam generation unit in power plant operates at a constant pressure of (10 bar) and the water evaporates at the rate of (0.9 from the total mass flow rate of water). Inlet and leaving water enthalpy are (200 kJ/kg) and (2000 kJ/kg) respectively. The inlet and outlet velocity are (10 m/s) and (25 m/s) respectively. If 80% of the heat energy supplied to the steam generation unit is used in evaporating the fluid. Determine the heat evaporation and work done if the inlet and outlet diameter are the same level. The fuel produces 28000 kJ of heat energy for one kg and the mass flow rate of water is 1000 kg/h.
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1. An engine with a cylinder volume of 250 cc and a volume at top dead centre of 25 cc uses a thermal cycle where the initial stage is an isentropic adiabatic compression process with the equation pvY = C. It is known that the initial conditions are 1 bar and 30°C. After that, a combustion process takes place in which heat is supplied at a constant volume. The heat given is 80 KJ/kg and if the specific heat at constant volume is known to be 0.718 kJ/kg K, determine the maximum temperature and pressure that occur? 2. Air with a mass of 3 kg is heated at constant volume from 25°C to 120°C. The process then takes place at constant pressure so that the gas has a temperature of 550°C. Determine the heat required and the entropy change that occurs during the process? (Air: Cp = 1.005 kJ/kg.K and y = 1.4; and assume Cp does not change with temperature). Known that initial volume is 50 ml and the last volume is 300 ml.
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12 Q.10 A cyclic heat engine operates between a source temperature of 723°C and sink temperature of 23°C. What is the least rate of heat rejection per kW net output of the engine? Also show the block diagram.