FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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The objective of a refrigerator is to remove QL from the cooled space.
The figure shown represents a refrigeration system works with R-134a as a refrigerant to produce 20
T.R. The evaporator, flash sub-cooler and condenser temperatures are respectively -23 °C, 0 °C and 42
°C. The liquid refrigerant leaves the condenser saturated and it is sub-cooled 7 °C in the liquid flash
sub-cooler. Vapor leaves the evaporator coil with 5 °C superheated. Adiabatic compression efficiency
is 90 % for each stage.
Find the power required to derive the compressor and C.O.P of the system.
Cond
Evap
8
C₁
C₂
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- Three evaporators operating at the same temperature 24 F having 10, 30 and 20 Tons of refrigeration respectively. The system has one compressor with R22 as refrigerant. Determine the coefficient of performancearrow_forwardThe coefficient of performance (COP) for a vapor compression cycle chiller is 8.7. If the chiller can produce 58 tons of cooling. If the chiller operates for a total of 3568 hours annually, and the cost of electricity is $0.15 per kWh, how much does it cost to operate the chiller? Fill in the operating cost of the chiller in one year in $.arrow_forwardFor refrigeration, answer the following questionsarrow_forward
- 4. An ammonia refrigerating plant operates between pressure limits of 10.34 bar and 2.265 bars. The refrigerant leaves the evaporator as a vapor 0.95 dry and leaves the condenser as a saturated liquid. If the refrigerant mass flow rate is 4 kg/min, find the cooling load. 65.3 kW O 70.5 kw O 75.52 kw O 52.5 kWarrow_forwardIn an ideal refrigeration system, that using R-717, coefficient of performance (COP) is equal to 3.5. If the cooling load of the cold storage is 20 tons of refrigeration, what is the ideal power of compressor (kW) approximately?arrow_forwardWhat is the coefficient of performance of the refrigeration plant mentioned in # 3?* a. 3.1 b. 3.4 c. 3.7 d. 3.9arrow_forward
- There are removed 3.06 m3/s of vapor from the water evaporator of a vacuum refrigeration system: the warm water enters the evaporator at 18oC and chilled water leaves at 10oC, make-up water enters at 29o Determine the refrigerating capacityarrow_forwardIn an Ideal Refrigeration Cycle (R-134a) operating at condenser temperature 50 °C. When refrigerant enters to evaporator it has 50% dryness quality. What is the pressure (bar) and temperature (°C) of evaporator respectively?arrow_forwardQuick solution,no gpt.arrow_forward
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