Fundamentals Of Engineering Thermodynamics, 9e
9th Edition
ISBN: 9781119391432
Author: MORAN
Publisher: WILEY
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Chapter 2, Problem 2.66P
To determine
The heat input into the system and the work input into the system.
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3. A reversible refrigeration cycle operates between cold and hot reservoirs at temperatures TC and TH, respectively.
(a) If the coefficient of performance is 3.5 and TC = -40 deg F,
determine TH, in deg F.
(b) If TC = -30 deg C and TH = 30 deg C, determine the coefficient
of performance.
(C) If QC = 500 Btu, QH = 800 Btu, and TC = 20 deg F, determine
TH, in deg F.
(d) If TC = 30 deg Fand TH = 100 deg F, determine the coefficient
of performance.
(e) If the coefficient of performance is 8.9 and TC = -5 deg C,
find TH, in deg C.
pls answer the given thanks
1.1 Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 1.5(105 ) W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg. Calculate the exergy destroyed in the process described by problem 1.4. The exergy of the fuel entering this process is 51.82 MJ/Kg. The dead state temperature is 293.2 K and pressure is 1 bar. The products of combustion leave this process at the dead state.
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Chapter 2 Solutions
Fundamentals Of Engineering Thermodynamics, 9e
Ch. 2 - Prob. 2.1ECh. 2 - Prob. 2.2ECh. 2 - Prob. 2.3ECh. 2 - Prob. 2.4ECh. 2 - Prob. 2.5ECh. 2 - Prob. 2.6ECh. 2 - Prob. 2.7ECh. 2 - Prob. 2.8ECh. 2 - Prob. 2.9ECh. 2 - Prob. 2.10E
Ch. 2 - Prob. 2.11ECh. 2 - Prob. 2.12ECh. 2 - Prob. 2.13ECh. 2 - Prob. 2.14ECh. 2 - Prob. 2.15ECh. 2 - Prob. 2.16ECh. 2 - Prob. 2.17ECh. 2 - Prob. 2.1CUCh. 2 - Prob. 2.2CUCh. 2 - Prob. 2.3CUCh. 2 - Prob. 2.4CUCh. 2 - Prob. 2.5CUCh. 2 - Prob. 2.6CUCh. 2 - Prob. 2.7CUCh. 2 - Prob. 2.8CUCh. 2 - Prob. 2.9CUCh. 2 - Prob. 2.10CUCh. 2 - Prob. 2.11CUCh. 2 - Prob. 2.12CUCh. 2 - Prob. 2.13CUCh. 2 - Prob. 2.14CUCh. 2 - Prob. 2.15CUCh. 2 - Prob. 2.16CUCh. 2 - Prob. 2.17CUCh. 2 - Prob. 2.18CUCh. 2 - Prob. 2.19CUCh. 2 - Prob. 2.20CUCh. 2 - Prob. 2.21CUCh. 2 - Prob. 2.22CUCh. 2 - Prob. 2.23CUCh. 2 - Prob. 2.24CUCh. 2 - Prob. 2.25CUCh. 2 - Prob. 2.26CUCh. 2 - Prob. 2.27CUCh. 2 - Prob. 2.28CUCh. 2 - Prob. 2.29CUCh. 2 - Prob. 2.30CUCh. 2 - Prob. 2.31CUCh. 2 - Prob. 2.32CUCh. 2 - Prob. 2.33CUCh. 2 - Prob. 2.34CUCh. 2 - Prob. 2.35CUCh. 2 - Prob. 2.36CUCh. 2 - Prob. 2.37CUCh. 2 - Prob. 2.38CUCh. 2 - Prob. 2.39CUCh. 2 - Prob. 2.40CUCh. 2 - Prob. 2.41CUCh. 2 - Prob. 2.42CUCh. 2 - Prob. 2.43CUCh. 2 - Prob. 2.44CUCh. 2 - Prob. 2.45CUCh. 2 - Prob. 2.46CUCh. 2 - Prob. 2.47CUCh. 2 - Prob. 2.48CUCh. 2 - Prob. 2.49CUCh. 2 - Prob. 2.50CUCh. 2 - Prob. 2.51CUCh. 2 - Prob. 2.52CUCh. 2 - Prob. 2.53CUCh. 2 - Prob. 2.54CUCh. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10PCh. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - Prob. 2.16PCh. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - Prob. 2.28PCh. 2 - Prob. 2.29PCh. 2 - Prob. 2.30PCh. 2 - Prob. 2.31PCh. 2 - Prob. 2.32PCh. 2 - Prob. 2.33PCh. 2 - Prob. 2.34PCh. 2 - Prob. 2.35PCh. 2 - Prob. 2.36PCh. 2 - Prob. 2.37PCh. 2 - Prob. 2.38PCh. 2 - Prob. 2.39PCh. 2 - Prob. 2.40PCh. 2 - Prob. 2.41PCh. 2 - Prob. 2.42PCh. 2 - Prob. 2.43PCh. 2 - Prob. 2.44PCh. 2 - Prob. 2.45PCh. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Prob. 2.48PCh. 2 - Prob. 2.49PCh. 2 - Prob. 2.50PCh. 2 - Prob. 2.51PCh. 2 - Prob. 2.52PCh. 2 - Prob. 2.53PCh. 2 - Prob. 2.54PCh. 2 - Prob. 2.55PCh. 2 - Prob. 2.56PCh. 2 - Prob. 2.57PCh. 2 - Prob. 2.58PCh. 2 - Prob. 2.59PCh. 2 - Prob. 2.60PCh. 2 - Prob. 2.62PCh. 2 - Prob. 2.63PCh. 2 - Prob. 2.64PCh. 2 - Prob. 2.65PCh. 2 - Prob. 2.66PCh. 2 - Prob. 2.67PCh. 2 - Prob. 2.68PCh. 2 - Prob. 2.69PCh. 2 - Prob. 2.70PCh. 2 - Prob. 2.71P
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- 1.1 Determine the electrical power supplied to a boiler when the temperature of the entering water is 20 C and the exiting temperature is 89 C. The flow of.the pressured water is 2 Kg/s. There is a negligible pressure drop through this boiler and it operates at a constant pressure of 3 bars. The specific heat is c = 4,370 J/(Kg K). There is a 1.5(105 ) W rate of heat loss from the boiler during this process to a surrounding at 293.2 k. Consider steady state conditions. Calculate the mass flowrate of fuel (natural gas, CH4) required to heat the water flow to the conditions of problem 1.1 if the electrical heating device is replaced with a gas fired boiler. The high heating value (HHV) of the fuel is 50.02 MJ/kg. Calculate the exergy destroyed in the process described by problem 1.4. The exergy of the fuel entering this process is 51.82 MJ/Kg. The dead state temperature is 293.2 K and pressure is 1 bar. The products of combustion leave this process at the dead state. Asnwer: The…arrow_forward8. A perfect gas is contained in a cylinder and undergoes an isothermal expansion according to the law p = A +Bv. where p is the pressure in bar, v is the volume in m' and A and B are constants. The initial and final pressures are 8.4 bar and 2.8 bar and the corresponding volumes are 0.056 m' and 0.168 m². Find 1. workdone by the gas, 2. heat transferred during the process, and 3. change in entropy per kg of gas during expansion. Take R = 275 J/kg K. Ans. 62.72 kJ: 62 72 kJ:0.3018 kJ/kg Kl 9. Calculate the change of entropy when 0.14 kg of gas initially at 170° C expands with a volume ratio of 5.4 according to pul 24 = Constant. Take y=1.4 and R=287 kJ/kg K. [Ans. 0.027 kJ/K] 0. One kg of air at a pressure of 7 bar and a temperature of 363 K undergoes a reversible polytropic process which may be represented by pul Constant. The final pressure is 1.4 bar. Evaluate: 1. The final specific volume, temperature and increase in entropy; and 2. The workdone and heat transfer during the…arrow_forwardThermodynamics: Assume temperature t1, pressure p1 and p2 (i.e chose your own values).arrow_forward
- A cycle composed of three processes, 1-2: constant volume.2-3 expansion with PV = constant and 3-1: constant pressure, occurs in a piston cylinder assembly. V1=0.025 m^3. U2-U1= 26.4 kJ. P1= 1.8 bar. U2=DU3. Work of process 3-1 is equal to -12.3 kJ. Determine the relative increase in the value of Qcycle if the process 2-3 is replaced by a polytropic process with n=1.3. Select one: a. 68 % b. 70 % c. 38 % d. 51 % e. 46 %arrow_forwardSolvearrow_forwardThermal efficiency of a power cycle is 0.8. For the cycle, Qout = 250 kJ. Determine Qin in kJ.arrow_forward
- Assume 5.08 lb/sec of fluid enter a steady- state, steady-flow system with P1 = 97.71 psia, p1 = 0.309 lb/ft, v1 = 94.19 fps, u1 = 793.23 BTU/lb, and leave with P, = 15.54 %3D %3D %3! %3D %3D psia, p2 = 0.148 Ib/ft°, v2 = 470.44 fps, and u2 = 772.14 BTU/lb. During the passage %3D %3D through the open system, each pound rejects 12.4 BTU of heat. Determine the work in hp.arrow_forwardSolve for mas flow rate, and compressor power in horsepower. Step by step solution please thank youarrow_forward5.4 In the continuous stirring heating tank, the flow rate of the influent is 200lb/min, the specific heat and density of the liquid are 0.32Btu/lbF, 62.4lb/ft^3, respectively, and the volume of the tank is 1.6ft^3, and the heat input Q from the heater is 2400Btu /min, the inflow temperature is kept constant at 90F. The inlet temperature suddenly dropped to 80F. In this case, find the response T(t) of the outflow temperature.arrow_forward
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