simple – vapor compression cycle develops 13 tons of refrigeration. Using ammonia as the refrigerant and operating at a condensing temperature of 24deg-C and evaporating temperature of -18deg-C find the following: refrigerating effect per unit of refrigerant, circulation rate in kg/min, power requirement in hp, and coefficient of performance. Use the spreadsheet to solve this probl

simple – vapor compression cycle develops 13 tons of refrigeration. Using ammonia as the refrigerant and operating at a condensing temperature of 24deg-C and evaporating temperature of -18deg-C find the following: refrigerating effect per unit of refrigerant, circulation rate in kg/min, power requirement in hp, and coefficient of performance. Use the spreadsheet to solve this probl

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...

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Similar questions

The operating condition for the single compressor in a household refrigerator is the lowest box temperature, which is typically A. 0F B. -20F C. 20F D. 40F
Why is two-stage compression popular for extra-low-temperature refrigeration systems?
Condensers in these refrigerators are all_______cooled.
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
Number 2 A refrigeration system with a capacity of 10 tons of refrigeration, operates at 210 kPa in the evaporator, while in the condenser it is 1100 kPa. If refrigerant R-717 is saturated, calculate the theoretical power required to operate the compressor. Compressor Power = Answer in kW.
Yeji just came back from dance practice and went straight to her bedroom. It was summer so the temperature in her bedroom was estimated to be around 40°C. She then turned her air conditioner on, closed her door and windows, and it cooled her bedroom to 18°C in 20 minutes. Calculate,a. How much heat was transferred to cool her bedroom to 18°C?b. What is the power consumption of the air conditioner, in kW?The air conditioner has a COP of 2.8. Assume the mass of her entire bedroom to be 750 kg of air, Cv = 0.72 kJ/kg.°C and Cp = 1.0 kJ/kg.°C.*Round off all answers to four decimal places*
Find the rate at which heat is extracted from the refrigerated space.
2. A refrigeration system with a capacity of 15 tons of refrigeration, operates at 150 kPa in the evaporator, while the condenser is 1450 kPa. If refrigerant R-717 is saturated, calculate the theoretical power required to operate the compressor. Compressor Power = Answer kW.
In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor as a saturated vapor and is cooled to the saturated liquid state in the condenser. It is then throttled to the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space. Figure Q3.1 depicts the description of this process. Warm environment Condenser Win Expansion valve Compressor Evaporator Cold refrigerated space Figure Q3.1: Ideal vapor-compression refrigeration cycle. (b) The same working fluid enters the condenser that operates between 0.14 to 0.8 MPa, and flow rate of refrigerant is 0.05 kg/s, Evaluate the rate of heat removal from the refrigerated space and the power input to the compressor. (i) (ii) Analyze the rate of heat rejection to the environment. (iii) Determine the COP of the refrigerator for this process. (iv) Predict the power input if the throttling valve is replaced by an isentropic turbine. Justify on the difference on the power input measured between…
Q2:- Multi-evaporator system with single compressor and individual expansion valves used refrigerant 143a at two different temperatures with a single compressor and a single condenser. The low-temperature evaporator operates at -40 °C with saturated vapor at its exit and has a refrigerating capacity of 5 tons. The higher- temperature evaporator produces saturated vapor at 4 bar at its exit and has a refrigerating capacity of 3 tons. The compression with isentropic efficiency 85% to the condenser pressure of 10 bar. The refrigerant leaves the condenser at 10 bar with subcooled to a temperature of 10°C. Draw the schematic diagram of the cycle and p-h diagram then calculate: a) The mass flow rate of refrigerant through each evaporator. b) The compressor power input, in kW. c) The C.O.P. d) The rate of heat transfer from the refrigerant passing through the condenser, in kW. e) The overall heat transfer coefficient of the condenser is 430 W/m2.°C and a heat transfer area of 16 m2. If…
In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor as a saturated vapor and is cooled to the saturated liquid state in the condenser. It is then throttled to the evaporator pressure and vaporizes as it absorbs heat from the refrigerated space. Figure Q3.1 depicts the description of this process. Warm environment QH Condenser Expansion valve Compressor Evaporator Cold refrigerated space Figure Q3.1: Ideal vapor-compression refrigeration cycle. Assuming a refrigerator operates on this principle and uses refrigerant-134a as the working fluid, answer the following questions. (a) The condenser operates at 1.6 MPa and the evaporator at -6°C. If an adiabatic, reversible expansion device was available and used to expand the liquid leaving the condenser, (i) Calculate the COP improve by using this device instead of the throttle device. (ii)Illustrate a T-s diagram that represents the ideal vapor-compression refrigeration cycle described in (a)
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