Properties of Carbon Dioxide: h @ 220 KPa and -5°C = 350 KJ/kg h: @ 25°C = 223.65 KJ/kg h @ 22°C = 220.75 KJ/kg h. @ 220 KPa = 347.13 KJ/kg %3D Saturated Vapor Carbon Dioxide refrigerant at 220 KPa leaves the evaporator and enters the compressor at -5 °C. The refrigerant leaves the condenser as saturate liquid at 25 °C and enters the expansion valve at 22 °C. Heat rejected from the condenser amount 90 KW. The work to the compressor is 60 KJ/kg while the heat lost from the compressor is 5 KJ/kg. If 2.5 KJ/kg of heat are lost in the piping between the compressor and condenser. Solve for QA in KW.

Properties of Carbon Dioxide: h @ 220 KPa and -5°C = 350 KJ/kg h: @ 25°C = 223.65 KJ/kg h @ 22°C = 220.75 KJ/kg h. @ 220 KPa = 347.13 KJ/kg %3D Saturated Vapor Carbon Dioxide refrigerant at 220 KPa leaves the evaporator and enters the compressor at -5 °C. The refrigerant leaves the condenser as saturate liquid at 25 °C and enters the expansion valve at 22 °C. Heat rejected from the condenser amount 90 KW. The work to the compressor is 60 KJ/kg while the heat lost from the compressor is 5 KJ/kg. If 2.5 KJ/kg of heat are lost in the piping between the compressor and condenser. Solve for QA in KW.

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 20RQ: Welded ______sealed compressors are normally used in household refrigerators.

See similar textbooks

Similar questions

Condensers in these refrigerators are all_______cooled.
THERMODYNAMICS A 1.5-kW power output is produced by a small, high-speed turbine that runs on compressed air. The entrance state is 400 kPa and 52 degrees celcius, whereas the exit state is 150 kPa and -43 degrees celcius. Determine the needed mass flow rate of air through the turbine assuming low velocities and an adiabatic process.
A certain Geothermal Power Plant shows that 1,700,000 kg/hr of pressurized ground water is available at 17.5MPa and 330°C. The water will be throttled to a pressure of 1.7MPa to produce wet steam and this mixture will be passed through a water separator to remove the water droplets so that saturated steam at 1.7MPa is available at the entrance of the Turbine. Other data are as follows: Discharge Pressure of turbine = 85kPa-Vac; Turbine Efficiency = 73%. Mechanical Loss = 2% of shaft power. Generator Efficiency = 95%. Determine the following: 1.The mass flow rate, in kg/min, of steam entering the turbine. a. 153,720 b . 76,858 c. 38,430 d. 19,200 e. 9,350 2. The maximum amount of power, in kW, that the plant can generate. a. 38,430 b. 19,200 c. 76,858 d. 9,350 e. 153,720
A car wash service uses 150 litre of pressurized (3 bar) warm water (45oC) to wash each car. It takes 10 min to wash each car. The service has 10 washing lanes, and it is open from (14:00 to 21:00) every day and 360 day per year. Each day 400 cars are washed. Fresh water at 1 bar pressure and 15oC is pressurized in a pump and then heated to desired temperature. Assume pump operates adiabatically and its efficiency is 85%, which is defined as the ideal power input divided by the actual power input. The ideal power input is the product of the volumetric flow rate times the pressure drop across the pump. All the other equipment of the car wash uses 5 kW of power during operation. Current (first alternative) is to buy electricity from the utility and use a natural gas fired boiler to heat the water. Assume natural gas furnace used in heating has 90% overall efficiency defined as heating provided water to heating released from fuel. The heating value of the natural gas (CH4) is 55.5 MJ/kg,…
15m3/sofmoistairat45Cdb,31Cwbandpassesthroughairwasher. If the saturation efficiency is 90%. Determine the air state at the outlet of the air washer.
Pls. answer thank you! The following performance data were generated by a gas turbine having intercooling: LP compressor inlet conditions of 14.7 psia and 520’’R: LP compressor isentropic discharge temperature, 743.8 R. compressor isentropic efficiency. 78 percent; HP.compressor inlet temperature, S20 degree R: HP compressor isentropic discharge temperature, 743.8 R. HP compressor isentropic efficiency, 82%; turbine inlet temperature, 2000R; and turbine isentropic efficiency, 90%, Calculate the net cycle work Btu/lb.
Air enters the compressor of a regenerative gas-turbine engine at 310 K and 100 kPa, where it is compressed to 900 kPa and 650 K. The regenerator has an effectiveness of 80 percent, and the air enters the turbine at 1400 K. For a turbine efficiency of 90 percent, determine (a) the amount of heat transfer in the regenerator and (b) the thermal efficiency. Assume variable specific heats for air.
Define the Reversible Isothermal Compression
Steam with h = 2442.6 kJ/kg flows at the rate of 22.7 kg/s into a water-steam condenser at the constant temperature of 48.9oC. The condensed steam leaves with h = 181.4 kJ/kg. The cooling water (cp = 4.187 kJ/kg-K) enters at 24.4oC and leaves at 37.8oC. Consider the condenser as an adiabatic steady flow system with ∆P = 0 and ∆K = 0. Compute the entropy production for the system; To = 21.1oC
A three-stage compressor receives 500 lps of air at 101 kPaa and 27 oC, anddischarges at 750 kPaa. Determine a) the power required; b) the pressure at eachintercooler; c) the maximum temperature; and d) the heat transferred in each intercooler.e) What is the discharge temperature of a single-stage compressor operating at the same intake and discharge temperatures?(answers for Letter D and E Thank you)
Thermodynamics Answer the following problem with complete solutions. Write legibly Refrigerant HFC-134a is ideally throttled from an enthalpy of 480 kJ/kg at the evaporator pressure of 0.20 MPa to a pressure of 0.02 MPa. What is the final enthalpy?
Define the Reversible Adiabatic Compression