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An internally reversible refrigerator has a modified coefficient of performance accounting for realistic heat transfer processes of
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Chapter 1 Solutions
Introduction to Heat Transfer
- The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically A. 0F B. -20F C. 20F D. 40Farrow_forwardChoose correct answer: Refrigerators and heat pumps operate on the same cycle but differ in their objectives. Select one: True Falsearrow_forwardHeat transferred from the higher and lower temperature reservoirs are and , respectively. Select the coefficient of performance for a refrigerator___________ A. 0.67 B. 1.5 C. 2.0 D. 0.5arrow_forward
- Help me fast with detail explanation . Definitely I will give Upvote.arrow_forwardA heat engine with efficiency = 60 %, driving both a heat pump and refrigerator at the same time, the work generated by the heat engine (WH.E=W₁ + W₂). W₁ gose to heat pump which (COPH.P.= 2), and W₂ gose to Ref. From the Figure and missing 850 K Tmax=? Tmax =? values, Find: Pada =? Rada= 60 KJ a) The Qadd, Qrej, and Tmin of the Heat Pump, b) The Qadd, Qrej, and Tmax of the Heat Engine c) The Qrej, COPRef., and Tmax of the Refrigerator Qroj=? H.P. Tmin=? Qadd = ? W₁=150 KJ/ H.E. Qrej=? 75 K W₂=50 K/ Ref. Qrej=? 50 Karrow_forwardReferring to the reversible heat pump cycle shown in the figure, p₁ = 14.7 lby/in². Pa = 34.7 lb/in², v₁ = 12.6 ft3/lb, v4 = 7.0 ft³/lb, and the gas is air obeying the ideal gas model. Step 1 Determine TH. in °R, and the coefficient of performance. Determine TH. in °R. TH= i Save for Later P4 °R PI V4 VI Ty Attempts: 0 of 4 used Submit Answer Activa Go to Searrow_forward
- 7. Find the refrigerating effect in a refrigerator if the COP is 3 and heat rejected is 40 kW.arrow_forwardA refrigeration unit with COP = 3.8 is being used to remove heat from a particular machine by 0.42 kg/s of water (C, = 4.18 kJ/kg.K) at 20 °C that is chilled from 40 °C as shown in the Figure. What is the power input (in kW) to the refrigeration unit? Select one: O 11.15 1 2 10.97 9.24 REF TH O 13.26 QH O 14.63 O 12.32arrow_forwardA Carnot refrigerator operates in a room in which the temperature is (T„ = H 26°C). The refrigerator consumes 361W of power when operating. What is the temperature of the refrigerated space "T," (in 99 °C) when Q, = 7763W? %3D 7,arrow_forward
- True or false Heat is transferred to a system by either a cheap commercially available air-sourced heat pump with coefficient of performance of just 1.5, or an expensive 100% efficient electrical resistance heater. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is minimum when heat is added by the cheap commercial heat pump. Heat is transferred to a system by either a cheap commercially available air-sourced heat pump with coefficient of performance of just 1.5, or an expensive 100% efficient isothermal heat source. The loss of Carnot Work Potential (Exergy destruction, or T0Sloss term) is minimum when heat is added by the isothermal heat source.arrow_forwardProvide complete solution and detailed diagram. A refrigerator is to remove heat from the cooled space at a rate of 300 KJ/min to maintain itstemperature at - 8oC. If the air surrounding the refrigerator is 25oC, determine the minimum powerrequired for this refrigerator? A. 0.263 kw B. 0.473 kw C. 0.623 kw D. 0.984 kwarrow_forwardThe objective of a refrigerator is to remove QL from the cooled space.arrow_forward
- Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
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