Answered: 8 Calculate the COP value for the vapor…

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Mechanical Engineering

8 Calculate the COP value for the vapor compression refrigeration cycle where Th=10C and Tc=-20C.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 19RQ: Two methods used to power refrigeration compressors on a ship are _____and ____.

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a standard vapor compression refrigeration system uses ammonia as refrigerant the amount of the evaporator negative 20 degrees centigrade on the condenser pressure is 1200 kpa. the flow rate is 30 kg/min. Determine a. the tons of refrigeration b. the power required c. the COP
In a Refrigerant 11 system ,one evaporator is to provide 210 kw of refrigerant at 0 0C and another evaporator is to provide 224 kw at -200C . The system uses two stage compression with intercooling and removal of flash gas. The condenser temp is 400C . Given that, h2=389kJ/kg, h4=416kJ/kg Compute the following: a.) mass flow rate at low stage compressor (m1)ANSWER: 1.25377 kg/s b.) mass flow rate at high stage compressor (m3)ANSWER: 2.90255 kg/s c.) low stage compressor workANSWER: 12.96406 kw d.) high stage compressor workANSWER: 78.68819 kw e.) total compressor workANSWER: 91.65226 kw f.) COPANSWER: 4.73528 g.) heat rejected in the condenserANSWER: 525.65226 kw
Please answer with complete solution. Thanks A refrigeration system using refrigerant 12 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature is -15°C and the condensing temperature 30°C. Determine the discharge compressor pressure in kPaa.
An ideal vapor compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at - 12 C. 1. Complete the table below 2.Calculate the specific enthalpy at the compressor exit to 2 decimal places 3.Calculate the mass flow rate of refrigerant in kg/s 4.Find the power requirement in KW to 3 decimal place and also find the coefficient of performance to 1 decimal place.
Pevap=4 bar, Pcond=20 bar, Qevap=6 kW, p6= 8.9 bar Refrigerant ( ammonia (R717) ) leaves the condenser as saturated liquid and as saturated vapor from the evaporator. Compression process in the compressor is isentropic. A) Based on the simple vapor-compression refrigeration cycle below, determine the compressor power and COP. Condenser 3 Evaporator ### Plot the T-s and P-h diagrams for options A Licensed for single user. © 2009 ASHRAE, Inc. -200 40 200 400 600 800 1000 1200 1400 1600 R-717 1800 2000 2200 2400 40 (ammonia) 20 Reference state: h- 200.0 kg. 1.00 kJjko KI for saturated kquid at OC 350 300 150 P: 100 kgm 80 200 10 20 60 8 120 6 40 10 100 30 4 8 80 20 6. 15 2 4 10 8.0 1 6.0 0.8 0.6 T= 20°C 4.0 1 0.8 3.0 0.4 20 0.6 1.5 0.2 0.4 1.0 0.80 0.1 0.2 0.60 0.08 0.06 0.40 0.1 0.30 0.04 0.08 0.20 0.06 0.15 0.02 8.00 0.04 0.10 840 KJkg K) 0.080 0.02 0.01 -200 8.80 0.060 200 400 600 800 Properties computed with: NIST REFPROP 1000 1200 1400 1600 0.01 2400 1800 2000 version 7.0 2200…
Please draw the diagram of the components of the vapor compression refrigeration cycle and briefly discuss its process.
The values of a vapor compression refrigeration cycle were given below. Calculate the values ofrefrigerant flow rate, refrigeration capacity, and the COP of the system.T1= Evaporator water outlet = 10 °CT2= Evaporator water inlet = 16 °CT3= Condenser water inlet = 16 °CT4= Condenser water outlet = 22°CCooling water flow rate = 1.5 L/minHeating water flow rate = 1.5 L/minEnthalpy of R134a in evaporator outlet = 305 kj/kg,Enthalpy of R134a in evaporator inlet =115 kj/kgEnthalpy of R134a in condenser inlet =327 kj/kg
b. A refrigerating system using Freon-12 has an evaporator saturation temperature of - 25°C and a condenser saturation temperature of 35°C. The vapor is dry saturated at entry to the compressor and has a temperature of 65°C after compression to the condenser pressure. There is no undercooling of the liquid in the condenser. i. Calculate the input power required by the compressor per kW of refrigeration. ii. Calculate the COPRef of the refrigerating system. ii. Show the operating cycle of the refrigerating system on a T-s diagram.
Define C.O.P. of the simple vapor compression refrigeration cycle R-717. The evaporation temperature is -10 ° C and the condenser temperature is 40 ° C. COP = Answer
Q2/ A refrigerator with tetrafluoroethane (R-134a) as refrigerant operate with an evaporation temperature of -34 °C and a condensation temperature of 18 °C. Saturated liquid refrigerant from the condenser flows through an expansion valve into the evaporator, from which it emerges as saturated vapor. What is the coefficient of performance (COP) of the refrigerator? (Note: The cycle is vapor compression cycle).
REFRIGERATION In a freon-22 refrigeration system, the capacity is 20 tons at a temperature of -20°C. The vapor from the evaporator is pumped by one compressor to the condensing pressure of 40C. Later, the system was revised to a two-stage compression operating on the cycle with intercooling but no removal of flash . Answer the ff: a. Calculate the power required by the single compressor in the original system. b. Calculate the total power required by the two compressors in the revised system.
1. IN A REFRIGERATION SYSTEM USING R-22, ONE EVAPORATOR IS TO PROVIDE 220KW OF REFRIGERATION AT -25C AND ANOTHER EVAPORATOR TO PROVIDE 200KW AT 5C. THE SYSTEM USES TWO STAGE COMPRESSION WITH INTERCOOLING AND IS ARRANGED LIKE IN 4-3. THE CONDENSINGTEMPERATURE IS 35C. CALCULATE THE POWER REQUIRED BY THE COMPRESSORS. WHAT IS THE COP OF THE SYSTEM?