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A household refrigerator operates with cold- and hot-temperature reservoirs of
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Chapter 1 Solutions
Introduction to Heat Transfer
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- Refrigerators currently being manufactured in the United States are using______as their refrigerant.arrow_forwardGeothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop systems.arrow_forwardThe heat removal rate from a refrigerated space is 7.2 kW and the power input to the compressor is 1.8 kW. The coefficient of performance (COP) of the refrigerator isarrow_forward
- Why is it important to clean the condenser coils of a household refrigerator a few times a year? Also, why is it important not to block airflow through the condenser coils?arrow_forwardA A Single system has a cooling capacity of 6 tons. The discharge of the evaporator is at -20°C & 0.1 MPa and the discharge of the condenser is at 30°C & 1.0 MPa. Determine the following: (a) the COP of the system, (b) the Energy Efficiency Ratio in kJ/hr/W, (c) the HP/ton of the system, (d) the Refrigerating Efficiency of the system. Stage Vapor Compression (SSVC) refrigeration 20 우 6 4 + - 150 140- 170- T = 160°C OL 국100- 06- s= 2.30 kJ/(kg-k) 09 006 220 4- 30: 0001 00 08 1050 06 0g Saturated Vapor 60 09 8'0 1200 1.70 - 09'1 0.7 1250 90 1.50- 1.40 OL- 1350 8-1.30 - 07- 00L 0E 1.20 FOL -50 1450 09- 1.10 T=-40°C 00'L =08'0= Saturated Liquid 20 -06'0 4. 2. 0.80 0.70 1 PRESSURE, MPa 250 350 009 150 008 00L 007 R-134a 0.2 0.2 2.0 0.04 20'0 zo'o 0.01 009 00S 002 008 001 € Tiliner-Roth and Baehr (1994 ENTHALPY, kJ/kg o paseg SIN m paynduoo saguadodarrow_forwardIn a household refrigerator, the condenser is vertically mounted at the outer backof the unit, the freezer (evaporator) on the topmost compartment, and thevegetable compartment at the very bottom. Explain why?arrow_forward
- An inventor claims to have developed a refrigeration unit that maintains a cold space at - 100°C while operating in a room where the temperature is 25°C, and which has a coefficient of performance (COP) of 6.5. Evaluate whether constructing such a unit is possible.arrow_forwardThermodynamics: A refrigeration unit using Refrigerant-134a is used to maintain a certain space at –15°C. The condenser rejects heat (?H) to cooling water that enters the condenser at 15°C at a rate of 0.2 kg/s and leaves at 35°C (all as saturated liquid water). The superheated refrigerant enters the condenser at 0.8 MPa and 40°C and leaves as a saturated liquid at the same temperature. If the compressor consumes 4.5 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load (?̇L), (c) the COP.arrow_forwardA refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that Q₁ = 26 kW. The compressor efficiency could range from 60 to 80 percent. This is to be completed individually. It would be highly unlikely for multiple students to select all the same design parameters in part (a). Expansion valve or capillary tube он Condenser Evaporator www. Compressor Work As part of the design, you should: a) Specify and justify the constraints (isentropic efficiency, condenser, and evaporator temperature) you chose. b) Show the cycle in relation to the two-phase region on a temperature-entropy (T-S) diagram.arrow_forward
- A refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that QL = 26 kW. The compressor efficiency could range from 60 to 80 percent. Using R-22 as the working fluid: 1. Determine the temperatures and pressures at the different points in the cycle (points 1, 2, 3, and 4). 2. Determine the coefficient of performance value and the mass flow rate of the working fluid. Please upload pic of tables if any are usedarrow_forwardA refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that QL = 26 kW. The compressor efficiency could range from 60 to 80 percent. As part of the design, you should: 1. Specify and justify the constraints (isentropic efficiency, condenser, and evaporator temperature) you chose. 2. Show the cycle in relation to the two-phase region on a temperature-entropy (T-s) diagram. Please upload picture of tables if any are usedarrow_forwardA refrigeration system is to be designed to maintain the temperature in the range of -15°C to -5°C, while the outside temperature varies from 15°C to 25°C. The total thermal load on the storage unit is given as 20 kW. Obtain an initial design for the vapor compression refrigeration system shown below. For safe operation and other factors, such as additional energy transfer, design the system using a safety factor of 1.3 such that QL = 26 kW. The compressor efficiency could range from 60 to 80 percent. Using ammonia (NH3) as the working fluid: 1. Determine the temperatures and pressures at the different points in the cycle (points 1, 2, 3, and 4). 2. Determine the coefficient of performance value and the mass flow rate of the working fluid. Please provide picture of tables if usedarrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage LearningRefrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
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