Q1: A refrigerator operates on an ideal vapor compression refrigeration cycle ( with R-134 a) as a working fluid) between 0.1 and 1 MPa (Low and High pressure), if the mass flow rate of the refrigerant is 0.05 Kg/s. find: a- The rate of heat removed from the refrigerator space and the power input to the compressor. b- The rate of heat reject by the condenser. c- COP of the cycle.

Q1: A refrigerator operates on an ideal vapor compression refrigeration cycle ( with R-134 a) as a working fluid) between 0.1 and 1 MPa (Low and High pressure), if the mass flow rate of the refrigerant is 0.05 Kg/s. find: a- The rate of heat removed from the refrigerator space and the power input to the compressor. b- The rate of heat reject by the condenser. c- COP of the cycle.

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 2RQ: The operating condition for the single compressor in a household refrigerator is the lowest box...

See similar textbooks

Similar questions

Why is two-stage compression popular for extra-low-temperature refrigeration systems?
Refrigerators currently being manufactured in the United States are using______as their refrigerant.
The defrost cycle in a domestic refrigerator may be terminated by two methods: ___and___.
Condensers in these refrigerators are all_______cooled.
A refrigeration system operated on an ideal vapor-compression using R-12 with a vaporizing temperature of -10 degrees Celsius and a condensing temperature of 30 degrees Celsius, it requires 15 hp to drive the motor of the compressor. Find the ff: Enthalpies at each point of the cycle in kJ/kg Refrigerating Capacity in TOR • Mass of the Refrigerant in kg/s Percent Quality in the mixture Heat Rejected in kW Coefficient of Performance • Schematic and P-h Diagram
Step: Evaluate the performance of Refrigerator 2.Refrigerator 2 is a refrigerator that operates as an ideal vapor refrigeration cycle, and uses theSame refrigerant and evaporation and condensing temperatures as Refrigerator 1.In Cooler 2, the working fluid must be admitted by the compressor only in the form of vaporsaturated, and must leave the compressor in the form of superheated steam with enthalpy equal to 1640 kJ/kg.Differently from Refrigerator 1, the cycle operates with an expansion valve (isenthalpic process).For this 2nd step, you must determine the following design parameters:a) The rate of cooling and the rate of heat rejection in the condenser.b) The power of the compressor;c) The COP of the cycle.For the energy balance, make the following considerations:- Permanent regime;- Variation of kinetic and potential energy are negligible;- Compressor and expansion valve operate adiabatically;- Evaporation and condensation steps do not involve work. Please, make it typeable,…
A split air conditioning unit operating on vapor compression cycle uses Refrigerant (R-134a). The various state points of refrigerant (R-134a) are shown on the TS diagram. Determine the following a) The refrigerating effect 3 (b) Compressor work 3 (c) The heat rejected in the condenser 2 (d) The COP of heating 2 (e) The tonnage capacity of the unit for the refrigerant mass flow of 0.025 Kg/s.
Q2: An ideal refrigeration cycle developing 30 Kw of refrigeration (with R-22) as a working fluid) operates between 40 °C and -15 °C calculate: 1- The refrigeration effect in KJ/Kg. 2- The flow of the refrigeration in Kg/s. 3- The power required by the compressor in Kw. 4-COP of the cycle. 5- The volume flow rate at compressor suction 6- The compressor discharge temperature.
A refrigerator like the one shown in the figure uses refrigerant 134a as the working fluid and operates in a vapor compression refrigeration cycle with an evaporator temperature of -4ºF and a condenser pressure of 130 Psia, the adiabatic efficiency of the compressor being 90%. The mass flow of the refrigerant is 6.5 lb / min. Calculate: a) the real power supplied to the compressor, in hp b) Refrigeration capacity in Ton, c) the COP
A reversible refrigerator operates using a Carnot refrigeration cycle. It operates usingr-134a between 140 and 400 kPa. The refrigerant exits the compressor (and enters the condenser) assaturated vapor. It also leaves the condenser as saturated liquid.a. Sketch the P-v and T-s diagram of this cycle. Define the coordinate properties of each state oneach graph.b. Evaluate the specific heat and specific work properties of each (in kJ/kg). Indicate the sense.c. Evaluate the coefficient of performance using the specific heats and works from the previousitem. Did it match with the COPR obtained if you used the operating temperatures? Solve for states first. Then, show the solution to each of the above required in order.
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
An ideal refrigeration cycle is used as an air conditioning system. The interior of the room must be kept at 20°C during summer, rejecting heat to the surroundings at 36°C. The power draw of the compressor is 2.5 kW. Determine:a) The heat inputb) The heat output