State the reasons that make the air-standard refrigeration cycle more suitable than vapor compression cycles for...
State the reasons that make the air-standard refrigeration cycle more suitable than vapor compression cycles for aircraft cooling applications.(at least 3 reasons plz)
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Both this procedure are used to lower the tempearture of defined area . Air Refrigeration cycles are used in aircraft regrigeration system whether its passenger plane or fighter plane or rockets . Some of the reasons why it is preferred over VCRS are mentioned below - 1. Availabilty of very high pressure air . 2. Heat carrying capacity of air is very small , since it does not frequently changes its phases due to it remains mostly in gaseous phase . 3. Mostly we need no seperate compressor , since work from compressor of jet engine can be used to run the cycle . 4. Air is non flammable , non toxic and very much reliable . 5. Cheap source |
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State the reasons that make the air-standard refrigeration cycle
more suitable than vapor compression cycles for...
a. c. Question 1: State three thermodynamic properties of a good refrigerant. b. State three reasons...
a. c. Question 1: State three thermodynamic properties of a good refrigerant. b. State three reasons that make the air-standard refrigeration cycle more suitable than vapor compression cycles for aircraft cooling applications. In a gas mixture, which component will have the higher partial pressure-the one with the higher mole number or the one with the larger molecular weight d. At standard conditions of 250C and 1 bar, are the enthalpies of formation of H2 and H (monoatomic hydrogen) different or...
Concept questions, (a) State three thermodynamic properties of a good refrigerant. (1 mark) (b) At standard...
Concept questions, (a) State three thermodynamic properties of a good refrigerant. (1 mark) (b) At standard conditions of 25°C and 1 bar, are the enthalpies of formation of H2 and H (monoatomic hydrogen) different or identical? (1mark) (c) State three reasons that make the air-standard refrigeration cycle more suitable than vapor compression cycles for aircraft cooling applications. (1 mark) (d) A stream of atmospheric air of specific humidity a passes through a water spray and comes out with ob. Under...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
An ideal vapor compression refrigeration cycle uses refrigerant 12 as a working fluid in an air...
An ideal vapor compression refrigeration cycle uses refrigerant 12 as a working fluid in an air conditioning system. The refrigerant enter the compressor as saturated vapor at 5oC and leaves the condenser as saturated liquid at 55oC. The mass flow rate of refrigerant is 0.7 kg/s. Heat is transferred from a reservoir at 15oC (the cool space) to the refrigerant in the evaporator and the heat rejected by the condenser is transferred to the environment which is at a temperature...
In a simple vapor compression refrigeration cycle: - Ammonia exits the evaporator as saturated· vapor at...
In a simple vapor compression refrigeration cycle: - Ammonia exits the evaporator as saturated· vapor at -22°C (State 1 ) .. - Ammonia enters the condenser at 16 Bar and 160°C (State 2; h2 = 1798.45 kJ/kg) - Ammonia exits the condenser as saturated l1quid at 16 Bar (State 3; h3 = 376.46 kJ/kg) - The refrigeration capacity is 150 kW. Draw the system schematic and the T-s diagram and determine: i) the mass flow rate· of refrigerant, ii) the...
The coefficient of performance-of vapor-compression refrigeration cycles
a) The coefficient of performance-of vapor-compression refrigeration cycles improves when the refrigerant is subcooled before it enters the throttling valve Can the refrigerant be subcooled indefinitely to maximize this effect, or is there a lower limit? Explain brieflyb) A two-stage compression refrigeration system with a flash chamber is used to produce chilled water for a commercial building The refrigeration system operates between a pressure limits of 1 2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves...
A 10-kJ/s cooling load is to be served by operating an ideal vapor-compression refrigeration cycle with...
A 10-kJ/s cooling load is to be served by operating an ideal vapor-compression refrigeration cycle with its'evaporator at 0.4 MPa and its condenser at 0.8 MPa. Calculate the refrigerant mass flow rate and the compressor power requirement when refrigerant-134a is used.
Consider a cascade system that uses vapor compression refrigeration for both high and low temperature cycles....
Consider a cascade system that uses vapor compression refrigeration for both high and low temperature cycles. Saturated vapor ammonia enters the compressor in the low temperature cycle at 20 psi and exits at 90 psi as it enters the heat exchanger. R134a enters the compressor in the high temperature cycle at 20oF and a quality of 0.84, and exits at 120 psi as it enters the high temperature condenser. Given a refrigeration capacity of 10 tons, determine: Ratio of the...
A freezer is designed, based on vapor-compression refrigeration cycle. The designed conditions are: R-134a as refrigerant,...
A freezer is designed, based on vapor-compression refrigeration cycle. The designed conditions are: R-134a as refrigerant, with a cooling capacity of 500 kW; compressor of 70% efficiency, with a superheat of 10°C before compressor inlet; operation temperature of -10°C inside the refrigerator, with the environment temperature of 25°C outside the refrigerator; Determine the pressure range of refrigeration cycle if a 10°C difference is required to ensure effective heat transfer of evaporator and condenser; Plot the refrigeration cycle on P-h diagram;...
1. Wet Compression Refrigerator A standard vapor-compression refrigeration system produces 20 tons of refrigeration using R-12...
1. Wet Compression Refrigerator A standard vapor-compression refrigeration system produces 20 tons of refrigeration using R-12 as a and an evaporator temperature of -33 °C. The system runs on the wet compression cycle. Determine (a) the refrigeration in [kJ/kg], (b) the circulating rate of R-12 in [kg/s], (c) the power required, (d) the COR, (e) the heat rejected in [kW], and (f) the volume flowrate of refrigerant at compressor inlet conditions. qin 87.5 kJ/kg COR 2.16 refrigerant while operating between...
a. c. Question 1: State three thermodynamic properties of a good refrigerant. b. State three reasons that make the air-standard refrigeration cycle more suitable than vapor compression cycles for aircraft cooling applications. In a gas mixture, which component will have the higher partial pressure-the one with the higher mole number or the one with the larger molecular weight d. At standard conditions of 250C and 1 bar, are the enthalpies of formation of H2 and H (monoatomic hydrogen) different or...
Concept questions, (a) State three thermodynamic properties of a good refrigerant. (1 mark) (b) At standard conditions of 25°C and 1 bar, are the enthalpies of formation of H2 and H (monoatomic hydrogen) different or identical? (1mark) (c) State three reasons that make the air-standard refrigeration cycle more suitable than vapor compression cycles for aircraft cooling applications. (1 mark) (d) A stream of atmospheric air of specific humidity a passes through a water spray and comes out with ob. Under...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
A 10-kJ/s cooling load is to be served by operating an ideal vapor-compression refrigeration cycle with its'evaporator at 0.4 MPa and its condenser at 0.8 MPa. Calculate the refrigerant mass flow rate and the compressor power requirement when refrigerant-134a is used.
1. Wet Compression Refrigerator A standard vapor-compression refrigeration system produces 20 tons of refrigeration using R-12 as a and an evaporator temperature of -33 °C. The system runs on the wet compression cycle. Determine (a) the refrigeration in [kJ/kg], (b) the circulating rate of R-12 in [kg/s], (c) the power required, (d) the COR, (e) the heat rejected in [kW], and (f) the volume flowrate of refrigerant at compressor inlet conditions. qin 87.5 kJ/kg COR 2.16 refrigerant while operating between...
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