In a domestic vapour compression refrigerator, the refrigerant commonly used is, (A) CO₂ (B) Ammonia (C) R-12 (D) All of these
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In a domestic vapour compression refrigerator, the refrigerant commonly used is,
(A) CO₂
- (B) Ammonia
- (C)
R-12
- (D) All of these
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- Condensers in these refrigerators are all_______cooled.The objective of a refrigerator is to remove QL from the cooled space.A refrigeration system operated on an ideal vapor-compression using R-12 with a vaporizing temperature of -10 degrees Celsius and a condensing temperature of 30 degrees Celsius, it requires 15 hp to drive the motor of the compressor. Find the ff: Enthalpies at each point of the cycle in kJ/kg Refrigerating Capacity in TOR • Mass of the Refrigerant in kg/s Percent Quality in the mixture Heat Rejected in kW Coefficient of Performance • Schematic and P-h Diagram
- Find the mass of water, in kg, that can be cooled from 24 0C to -80C from a 10 tons refrigeration system for 15 hrs. ANSWER: 4197.930 kg A refrigeration system is used to cool water in the evaporator at 3 kg/s of water from 22 oC to ice. Find the tons of refrigeration required. ANSWER: 364.48805 TR A two stage cascade refrigeration system uses R-11 as the working substance. The evaporator is at -30 0C and the high pressure condenser is at 300C. The cascade condenser is a direct contact type. The refrigeration load is 24 tons. Given that, h2 = 393 kJ/kg; h6 = 408 kJ/kg. Find the mass flow rate in the low pressure loop. ANSWER: 0.4771 kg/sA compressor serves two evaporators, one providing 5 tons of cooling at -20 degree F and the other, 10 tons of cooling at 10F. The system is a vapor-compression refrigeration system using R-12 with the condenser pressure at 200 psia. Assume saturated conditions leaving the condenser and evaporators and isentropic compression. Determine (a) the refrigerant flow through each evaporator, (b) the R-12 state entering the compressor, and (c) the compressor power.A vapor compression refrigeration systemhas an enthalpy of saturated liquid at the hightemperature side is 341.769 kJ/kg while at lowtemperature side is 131.27 kJ/kg and a latentheat of vaporization of 1312.63 kJ/kg. If themass flow rate of refrigerant is 0.50 kg/s.compute the tons of refrigeration.
- In an 18-tons absorption refrigeration system, the heating in the generator is carried out by using steam at 3 Bar and 85% dry. The refrigeration temperature is -10OC. The condensation of the refrigerant is carried out at 30 OC using cooling water. Determine: a) The maximum possible COP of the system and b) The quantity of steam required per hour to run the plant if the steam leaves the generator as saturated water at the same pressure. Assume actual COP to be 40% of the maximum COP.A 10-kW cooling load (i.e., ?̇ L) is to be served by operating an ideal vapor-compression refrigeration cycle with its evaporator at 400 kPa and its condenser at 800 kPa. If the compressor’s isentropic efficiency is set at 68%, determine (a) the mass flow rate of the refrigerant, in kg/min (b) the rate of heat rejection to the environment, in kW (c) the COP of the refrigerator Disregard any heat loss in the expansion valve and compressor as well as the change in potential and kinetic energy of the refrigerant in any part of the cycle. Use g = 9.81 m/s2 or 32.2 ft/s2 , T(K)=T(°C)+273 and T(R)=T(°F)+460, where applicable.Can you explain the process of this refrigeration and cryogenic plant for liquid oxygen production?
- Refriegerant ammonia enters the compressor of a refriegerant as a superheated vapor at 0.14 MPa, -20 °C at a rate of 0.04 kg/s, and leaves at 0.8 MPa, 50 °C. The refriegerant is cooled in the condenser to 0.75 MPa and is throttled to 0.14 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between components, determine:a) the rate of heat removal from the refriegerated space in kWb) the power input to the compressor in KWc) the COP pf the cycleA vapor compression refrigeration cycle undergoes wet compression and maintains the temperatureof the refrigerated space to -25C. The system uses R-12 refrigerant and undergoes isentropicexpansion to the inlet of the evaporator. The compressor discharges the refrigerant at saturatedvapor state at a condensing pressure of 1367 kPa. Determine:a) Determine the enthalpy of all statesb) Determine the quality of refrigerant entering the evaporatorc) Determine the quality of refrigerant leaving the evaporatord) Refrigerant effecte) Work of compressionf) COP If a liquid to suction heat exchanger was installed to prevent wet compression such that it allows 6Csub cooling of refrigerant and superheating to 8C. The expansion of refrigerant is no moreisentropic but isenthalpic. Therefore, determine:g) Enthalpy at different section of the cycleh) COP of the system compared to COP of standard vapor compression cycle.Properties of Carbon Dioxide: h @ 220 KPa and -5°C = 350 KJ/kg hi @ 25°C = 223.65 KJ/kg h: @ 22°C = 220.75 KJ/kg ha @ 220 KPa = 347.13 KJ/kg %3D Saturated Vapor Carbon Dioxide refrigerant at 220 KPa leaves the evaporator and enters the compressor at -5 °C. The refrigerant leaves the condenser as saturate liquid at 25 °C and enters the expansion valve at 22 °C. Heat rejected from the condenser amount 90 KW. The work to the compressor is 60 KJ/kg while the heat lost from the compressor is 5 KJ/kg. If 2.5 KJ/kg of heat are lost in the piping between the compressor and condenser. Solve for QA in KW.