FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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b- A vapour compression refrigerator uses refrigerant (R – 410a) and operates between
temperature limits of -10°C and 45 C. At entry to the compressor, the refrigerant is
dry saturated and after compression it acquires a temperature of 60°C. Find the C.O.P.
of the refrigerator.
/Heat is transferred from a tank of water in a refrigerator at(OC)
degrees to a tank of boiling water at (100 C) degrees. With a reversible
machine (heat pump). Calculate the Heat drawn from the refrigerator. if it
was The heat transferred to the tank of boiling water is 2254kJ.
Find the required work to transfer 1200j of heat from the sink(cold body)-90°c source (hot body)at 35°c in the case of refrigerator
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- Kentaja is volunteering with Doctors Without Borders, and is distributing the Maderna vaccine in Libya. She is in a region wheré the average Summer temperature is 104°F, but the Moderna vaccine must bé kept in a 50°F refrigerator for distribution. Kentaja remenmbers her Physics training and designs a refrigerator that uUseš retrigerant 12 and has a mass flow rate 0.004 kg/s that 'does the job. For Kentaja's refrigerator calculate : A.) Power input required by the compressor B.) Coefficient of performancearrow_forwardFind the refrigeration capacity (in TR ) required to cool 29 m³/min from 29°C to 18°C if air from the outside has 90% RH?arrow_forwardA 90 TR system has a compressor input of 0.97 kW per ton of refrigeration and COP of 5. What is the efficiency of the compressor?arrow_forward
- The evaporator of a refrigeration system is to be maintained at-12°C.If degree superheat is 7℃, find the temperature of refrigerant entering the compressor.arrow_forwardPineapple fruits with a mass of 500 kg are supplied to a cold storage at 20 C. The cold storage is maintained at 5 C and the fruits get cooled to a storage temperature in 10 hours. The latent heat of freezing is 105 kJ/kg and the specific heat of fruit is 1.256 kJ/kg.K. Find the refrigeration capacity of the plant.arrow_forwardIn a cascade refrigeration system,the compressor power in the low and high pressure loop are 12 kw and 13 kw,respectively.Find the tons of refrigeration if COP is 5.arrow_forward
- Do fastarrow_forwardA refrigeration system is used to cool water in the evaporator at 5 kg/s of water from 30 °C to ice. Find the tons of refrigeration required.arrow_forwardQ3/ A refrigeration unit of 20 T.R uses R-12 as a refrigerant and works between evaporating and condensing (10 degree) temperature of -20 °C and 37 °C. The vapor leaves the evaporator saturated and the liquid leaves the condenser saturated also. Find out the change of; (a) Mass flow rate of refrigerant, (b) Power consumed, (c) Volumetric efficiency, and (d) Piston displacement in the following to cases (i) The evaporation temperature is decreased to -27 °C due to a change of product while the condensing temperature is still constant, (ii) The condensing temperature is increased to 45 °C due to a change of outside conditions while the evaporating temperature is still constant at -20 °C.arrow_forward
- A heat pump operates between 36 degrees fahrenheit and 120 degrees fahrenheit . If heat added from the low temp. region is 500 BTU/min. Find the horsepower needed for the compressor power.arrow_forwardI need the answer as soon as possiblearrow_forwardThe following data refers to an air conditioning system to be designed for an industrial process for hot and wet climate. Outside conditions = 38o C DBT and 74 % RH. Required conditions are 23o C DBT and 65 % RH. This is achieved by cooling and dehumidifying and then by heating. If 42 m 3 of air is absorbed by the plant every minute, find the capacity of cooling coil in TR, capacity of heating coil in kW and amount of water removed per hourarrow_forward
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