FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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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.
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.
A refrigeration system with a capacity of 10 tons of refrigeration, operates at 210 kPa in the evaporator, while in the condenser it is 850 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor power = ... W.
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- A refrigeration unit utilises ammonia as the refrigerant. The diagram for the circuit isshown in Figure Q3 below, with the following conditions: point (1) is a saturated liquidat –30 oC, points (3), (4) and (7) is a saturated liquid at 10 oC and point (5) is a saturatedvapour at –30 oC. The isentropic efficiency of the compressor and pump is 80% and itis assumed there are negligible heat losses to the surroundings. The liquid ammoniahas a specific volume of 0.0015 m3 kg-1. (a) Discuss which factors must be considered when selecting an appropriate refrigerant?(b) Calculate the coefficient of performance (COP) of the cycle.(c) If the effect of refrigeration is 10 kW, determine the required mass flow rate.arrow_forwardA refrigeration system with a capacity of 10 tons of refrigeration, operates at 210 kPa in the evaporator, while in the condenser it is 800 kPa. If R-134a refrigerant is in a saturated state, calculate the theoretical power required to operate the compressor. Compressor power = .... kWarrow_forwardAn ideal refrigeration system using R-134a, working at -10 °C and 40 °C for evaporator and condenser temperature respectively. What is the Pressure of condenser and Evaporator respectively in "bar" unit.arrow_forward
- A refrigerator in a meat warehouse must keep a low temperature of -20°C and the outside temperature is 25°C. Ammonia is used as the refrigerant which must remove 10 kW from the cold space. Compute for the flow rate of the ammonia needed assuming a standard vapor compression refrigeration cycle with a condenser at 25°C. Find the enthalpy of the stream exiting the evaporator, condenser, and throttling (expansion) valve.arrow_forwardusing the values given in the two evaporator refrigeration systema) Draw the T-s diagram. (evaporator output saturated steam, condenser output saturated liquid, compressor isentropic efficiency is 0.8)b) Find the coefficient of performance (COP).arrow_forwardQ2: Two stage vapour compression refrigeration system with water intercooler uses R-22 as shown in figure 2 below. The evaporating temperature is -40 °C and condensing temperature 40 °C. The refrigeration capacity is 10 TR and the compression is adiabatic reversible process. The refrigerant leaves the water intercooler at 10 °C. Draw the cycle on p-h diagram and determine:- 1- The refrigerant mass flow rate. 2- Work done of each compressor. 3- Condenser heat load. >4- Coefficient of performance. 60 1arrow_forward
- In a 14 TR ammonia refrigeration plant, the condensing temperature is 250C and evaporating temperature -100C. The refrigerant ammonia is sub-cooled by 5 OC before passing through the throttle valve. The vapor leaving the evaporator is 0.97 dry. Find: 1. Coefficient of performance: and 2. Power required.arrow_forwardQ.2: A refrigeration system using refrigerant 22 is to have a refrigerating capacity of 80 kW. The cycle is a standard vapor-compression cycle in which the evaporating temperature 42°C. -8°C and the condensing temperature (a) Determine the volume flow of refrigerant measured in cubic is meters inlet at the to the compressor. second per (b) Calculate the power required by the compressor. (c) At the entrance to the evaporator what is the fraction of vapor in the mixture.arrow_forward2. A refrigeration system with a capacity of 10 tons of refrigeration, operates at 210 kPa in the evaporator, while in the condenser it is 1170 kPa. If refrigerant R-717 is saturated, calculate the theoretical power required to operate the compressor. Compressor Power = AnswerkWarrow_forward
- Sea water for cooling enters a condenser at 32℃ and leaves 42℃. The Condenser temperature 65℃, Calculate LMTD. ANSWER: 28℃arrow_forwardVCRC with Flash Intercooling Use the given-required-solution format and show the unit analysis. Subject: Refrigeration Systems.arrow_forwardAn 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.arrow_forward
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