A household refrigerator operates with cold- andhot-temperature reservoirs et
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- Refrigerators currently being manufactured in the United States are using______as their refrigerant.arrow_forwardWelded ______sealed compressors are normally used in household refrigerators.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_forward
- Thermodynamics: 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 food storage chamber requires a refrigeration system of 10 ton capacity operating at an evaporator temperature of -9,2°C and a condenser temperature of 28,6°C. Refrigerant R-134a is used and the system operates under saturated conditions. Determine: a. C.O.P b. Refrigerant flow rate (kg/s) c. Rate of heat removed by condenser (kJ/s)arrow_forwardA manufacturer conducted an experiment for an evaporator capacity 507 kW cooling and designed for high COP of 1.8 when using lithium bromide plus water in an absorption refrigeration system. The evaporator operates 20 C, condenser 40 C & absorber 45 C supplying 1.4 kg/s of water plus lithium bromide solution to the generator. For a condenser size of 694 kW, determine: Heat provided by the generator & absorber capacity in kWarrow_forward
- A refrigerator is rated at a COP of 5.2. The refrigerated space that it cools requires a peak cooling rate of 42 000 kJ/ h. The size of electrical motor in horsepower that is required for the refrigerator is O 3.166297 O 2.980044 3.911308 O 4.097561arrow_forwardA food storage chamber requires a refrigeration system of 15- ton capacity operating at an evaporator temperature of -17.5°C and a condenser temperature of 42.5°C. Refrigerant R-134a is used and the system operates under saturated conditions. Determine: a. C.O.P. b. Refrigerant fl ow rate = .. Kg/s c. Rate of heat removed by condenser = .. Kj/sarrow_forwardIn a household refrigerator, the condenser is vertically mounted at the outer back of the unit, the freezer (evaporator) on the topmost compartment, and the vegetable compartment at the very bottom. Explain why?arrow_forward
- A 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_forwardRefrigerant vapor rejects 70 kW of heat as it passes through an air-cooled condenser. The condenser has an air-side area of 210 m2 and based on this area, has an overall heat transfer coefficient of 0.037 kW/m?.°C. Cooling air flows at a rate of 7.59 kg/s. If condensation of the refrigerant occurs at 55°C, what is the inlet temperature (in °C) of the air? Take the specific heat of air to be 1.02 kJ/kg.°C. Round your answer to 2 decimal places.arrow_forwardA surface condenser serving a 50,000-kW steam turbo-generator unit receives exhaust steam at the rate of 196,000 kg/hr. Vacuum in condenser is 702 mmHg. Sea water SG=1.03 and Cp=0.93 Btu/lb-F is used for cooling enters at 29.5C and leaves at 37.5C. From the steam condenser design, manufacturer consider 950 Btu/lb of steam condensed as heat given up cooling water. Calculate the required quantity of cooling water in m3/s.arrow_forward
- Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning