FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Identify valid processes as those that satisfy both the first and second laws of thermodynamics.
The refrigerator shown in the figure below operates at steady state with a coefficient of performance (COP) of 5.0 within a kitchen at 23 °C. The refrigerator rejects 4.8 kW by heat transfer to its surroundings from metal coils located on its exterior. Determine:
(a) the power input, in kW.(b) the lowest theoretical temperature inside the refrigerator, in K.
Exercise 5.50
The refrigerator shown in Fig operates at
Refrigerator
B = 4.5
steady state with a coefficient of performance of 4.5
and a power input of 0.8 kW. Energy is rejected from
the refrigerator to the surroundings at 20°C by heat
transfer from metal coils whose average surface
temperature is 28°C.
Surroundings, 20°C
- Coils, 28°C
Determine
(a) the rate energy that is rejected, in kW.
(b) the lowest theoretical temperature inside the
refrigerator, in K.
(c) the maximum theoretical power, in kW, that could
be developed by a power cycle operating between the
coils and the surroundings. Would you recommend
making use of this opportunity for developing power?
0.8 kW
49
Chapler
Knowledge Booster
Similar questions
- * \Q1 The refrigerator shown in Fig. P5.35 operates at steady state with a coefficient of performance of 4.5 and a power in- put of 0.8 kW. Energy is rejected from the refrigerator to the surroundings at 20°C by heat transfer from metal coils whose average surface temperature is 28°C. Determine (a) the rate energy is rejected, in kW. (b) the lowest theoretical temperature inside the refrigerator, in К. (c) the maximum theoretical power, in kW, that could be de- veloped by a power cycle operating between the coils and the surroundings. Would you recommend making use of this opportunity for developing power? Refrigerator B = 4.5 Surroundings, 20°C Coils, 28°C S. 0.8 kW إضافة ملفarrow_forwardmachanical sciencearrow_forward5.45 WP As shown in Fig. P5.45, an air conditioner operating at steady state maintains a dwelling at 70°F on a day when the outside temperature is 90°F. If the rate of heat transfer into the dwelling through the walls and roof is 30,000 Btu/h, might a net power input to the air conditioner compressor of 3 hp be sufficient? If yes, determine the coefficient of performance. If no, determine the minimum theoretical power input, in hp.arrow_forward
- Explain and sketch, the SECOND LAW ?OF THERMODYNAMICarrow_forward2. A power cycle receives energy QH by heat transfer from a hot reservoir at TH = 1200 R and rejects energy QC by heat transfer to a cold reservoir at TC = 400 R. For each of the following cases, determine whether the cycle operates reversibly, operates irreversibly, or is impossible. (a) QH = 900 Btu, Wcycle = 450 Btu (b) QH = 900 Btu, QC = 300 Btu (c) Wcycle = 600 Btu, QC = 400 Btu (d) Eff. = 70%arrow_forwardA gas within a piston–cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series, beginning at state 1 where m = 0.5 kg, p1 = 1 bar, V1 = 1.5 m3, as follows: Process 1–2: Compression with pV = constant, W12 = -102 kJ, u1 = 424 kJ/kg, u2 = 780 kJ/kg. Process 2–3: W23 = 0, Q23 = -150 kJ. Process 3–1: W31 = 48 kJ. There are no changes in kinetic or potential energy. Determine Q12 and Q31, each in kJ.arrow_forward
- A gas within a piston–cylinder assembly undergoes a thermodynamic cycle consisting of three processes in series, beginning at state 1 where m = 0.5 kg, p1 = 1 bar, V1 = 1.5 m3, as follows: Process 1–2: Compression with pV = constant, W12 = -102 kJ, u1 = 424 kJ/kg, u2 = 780 kJ/kg. Process 2–3: W23 = 0, Q23 = -150 kJ. Process 3–1: W31 = 48 kJ. There are no changes in kinetic or potential energy. Draw all processes schemes and a p-V diagramsarrow_forwardI need some help in how to solve this problem. Any help will be appreciated. Thanksarrow_forwardAn air conditioner operating at steady state maintains a dwelling at 20 C on a day when the outside temperature is 35 C. Energy is removed by heat transfer from the dwelling at a rate of 2800 J/s while the air conditioner's power input is 0.8 kw. (a) Determine the coefficient of performance of the air conditioner. (b) Determine the power input required if it was a Carnot refrigerator. English (United States) 目 98%arrow_forward
- Apply the second law of thermodynamics to cycles and cyclic devices.arrow_forwardQ1. Considering the example of refrigerator as system, define and provide the example from the refrigerator system to each of the following: 1. Open system 2. Closed system 3. Independent and dependent property 4. Intensive and extensive property 5. Equilibrium Q2. Considering the example of automotive vehicle system (car), define and provide the example from the car system to each of the following: 1. Isobaric process 2. Isothermal process 3. Isochoric process 4. Adiabatic process 5. Steady state and unsteady state processarrow_forwardP.4 (Application on the First Law of Thermodynamics with heat transfer) A silicon chip measuring 5 mm on a side and 1 mm in thickness is embedded in a ceramic substrate. At steady state, the chip has an electrical power input of 0.225 w. The top surface of the chip is exposed to a coolant whose temperature is 20°C. The rate of energy transfer by heat between the chip and the coolant is given by 9= hA (T, - T), where T, and T, are the surface and coolant temperatures, respectively, A is the surface area, and If heat transfer between the chip and the substrate is negligible, determine the surface temperature of the chip, in °C.arrow_forward
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