Why is the throttling valve not replaced by an isentropic turbine in the ideal vapor-compression refrigeration cycle?
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A: Note: As per policy, we can solve the first three subparts. Please resubmit the remaining part.
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A: To find: Reasonable pressures for the evaporator and condenser.
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Why is the throttling valve not replaced by an isentropic
turbine in the ideal vapor-compression refrigeration cycle?
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- A vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 240 and 1600 kPa. The isentropic efficiency of the compressor is 78%. Determine (a) the heat absorption in the evaporator, (b) the heat rejection in the condenser, (c) the work input, and (d) the COPConsider the ideal vapor compression cycle operating between 1.4 bar and 9bar using R-125 as the refrigerant, which removes heat from a cold space at a rate of 100kW. If the evaporator outlet was suddenly superheated by 2℃ above saturation, what will be the resulting effect on the cycle? a.Refrigerant flowrate will decrease, Condenser duty will decrease b.Refrigerant flowrate will increase, Condenser duty will decrease c.Refrigerant flowrate will increase, Condenser duty will increase d.Refrigerant flowrate will decrease, Condenser duty will increaseAn ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 200 and 1600 kPa. The refrigerant absorbs heat from a space at 3°C and rejects heat to ambient air at 27 °C. Determine (a) the heat absorbed in the evaporator and the work input, (b) the COP, (c) the exergy destruction in each component of the cycle and the total exergy destruction in the cycle, (d) the second-law efficiency of the cycle.
- Consider a refrigeration system that operates on an actual vapor-compression refrigeration cycle with refrigerant 134a as the working fluid with an isentropic efficiency of a compressor of 75.1%. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Determine the value of h2 in kj/hg, answer in 4 decimal places with unit analysis. Subject: Thermodynamics 2Why is the reversed Carnot cycle executed within the saturation dome not a realistic model for refrigeration cycles?Consider a refrigeration system that operates on an actual vapor-compression refrigeration cycle with refrigerant 134a as the working fluid with an isentropic efficiency of a compressor of 83.4%. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Determine the value of h2 in kj/hg, answer in 4 decimal places with unit analysis. SUBJECT: Refrigeration Systems
- Air enters the compressor of an ideal Brayton refrigeration cycle at 100 kPa, 270 K. The compressor pressure ratio is 3 and the temperature at the turbine inlet is 310 K. Determine:The above Brayton refrigeration cycle is modified by introducing a regenerative heat exchanger. In the modified cycle, the compressed air enters the regenerative heat exchanger at 310 K and is cooled to 280 K before entering the turbine. Determine for the modified cycle:f).the net work input per unit mass of air flow, in kJ / kg. g).the cooling capacity, per unit mass of air flow, in kJ / kg.h).the coefficient of performance.A vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 240 and 1600 kPa. The isentropic efficiency of the compressor is 78%. The refrigerant is superheated by 5.4 °C at the compressor inlet and subcooled by 5.9 °C at the exit of the condenser. Determine (a) the heat absorption in the evaporator, (b) the heat rejection in the condenser, (c) the work input, and (d) the COP. (e) Also determine all parameters if the cycle operated on the ideal vapor-compression refrigeration cycle between the same pressure limits.The COP 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.
- Consider a two-stage cascade refrigeration system operating between 0.1MPa and 1MPa. Each stage operates on the ideal cycle with R-134a as the working fluid. Heat rejection from the lower to the upper cycle occurs at 0.4MPa. If the mass flow rate in the upper cycle is 0.1 kg/s, Determine:(a) the mass flow rate through the lower cycle and (b)the COP.Given the T-s diagram of the vapor compression refrigeration cycle with 0.09 kg/s of refrigerant 134a as the working fluid, as shown, determine: a) The isentropic efficiency of the compressor, %. b) Cooler performance coefficientAir enters the compressor of an ideal Brayton refrigeration cycle at 100 kPa, 270 K. The compressor pressure ratio is 3 and the temperature at the turbine inlet is 310 K. Determine:d).the coefficient of performance of a Carnot refrigeration cycle operating between thermal reservoirs at TC 270 K and TH 310 K, respectively. The above Brayton refrigeration cycle is modified by introducing a regenerative heat exchanger. In the modified cycle, the compressed air enters the regenerative heat exchanger at 310 K and is cooled to 280 K before entering the turbine. Determine for the modified cycle:(e).the lowest temperature, in K.f).the net work input per unit mass of air flow, in kJ / kg.