An adiabatic capillary tube is used in some refrigeration systems to drop the pressure of the refrigerant from the condenser level to the evaporator level. R-134a enters he capillary tube as a saturated liquid at 70.4 oC, and leaves at -2 oC. Determine the rate of entropy generation in the capillary tube for a mass flow rate of 0.37 kg/s. sl (kJ/kgK) Format : 0.3839 x2 Format : 0.248 52 (kJ/kgK) Format : 0.7868 Sgen (kW/K) Format : 0.0284

An adiabatic capillary tube is used in some refrigeration systems to drop the pressure of the refrigerant from the condenser level to the evaporator level. R-134a enters he capillary tube as a saturated liquid at 70.4 oC, and leaves at -2 oC. Determine the rate of entropy generation in the capillary tube for a mass flow rate of 0.37 kg/s. sl (kJ/kgK) Format : 0.3839 x2 Format : 0.248 52 (kJ/kgK) Format : 0.7868 Sgen (kW/K) Format : 0.0284

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Refrigerant-134a enters a compressor as a saturated vapor at 160 kPa at a rate of 0.03 m3/s and leaves at 800 kPa. The power input to the compressor is 10 kW. If the surroundings at 20C experience an entropy increase of 0.008 kW/K, determine (a) the rate of heat loss from the compressor, (b) the exit temperature of the refrigerant, and (c) the rate of entropy generation.
Refrigerant-134a enters the coils of the evaporator of a refrigeration system as a saturated liquid–vapor mixture at a pressure of 140 kPa. The refrigerant absorbs 180 kJ of heat from the cooled space, which is maintained at –10°C, and leaves as saturated vapor at the same pressure. Determine the total entropy change for this process.
An adiabatic capillary tube is used in some refrigeration systems to drop the pressure of the refrigerant from the condenser level to the evaporator level. R-134a enters the capillary tube as a saturated liquid at 70 degrees Celsius and leaves at -20 degrees Celsius. Determine the rate of entropy generation in the capillary tube for a mass flow rate of 0.2 kg/s.
An adiabatic capillary tube is used in some refrigeration systems to drop the pressure of the refrigerant from the condenser level to the evaporator level. R-134a enters the capillary tube as a saturated liquid at 65.9 oC, and leaves at -12 oC. Determine the rate of entropy generation in the capillary tube for a mass flow rate of 0.83 kg/s. s1 (kJ/kgK) Format : 0.3382 x2 Format : 0.335 s2 (kJ/kgK) Format : 0.4832 Sgen (kW/K) Format : 0.0504
Refrigerant-134a is expanded adiabatically from 100 psia and 100°F to a pressure of 10 psia. Determine the entropy generation for this process, in Btu/lbm·R.
Determine the work input and entropy generation during the compression of steam from 100 kPa to 1 MPa in (a) an adiabatic pump and (b) an adiabatic compressor if the inlet state is saturated liquid in the pump and saturated vapor in the compressor and the isentropic efficiency is 85 percent for both devices.
Refrigerant-134a enters the coils of the evaporator of a refrigeration system as a saturated liquid–vapor mixture at a pressure of 140 kPa. The refrigerant absorbs 180 kJ of heat from the cooled space, which is maintained at –10°C, and leaves as saturated vapor at the same pressure. Determine the entropy change of the refrigerant.
Air enters the evaporator section of a window air conditioner at 100 kPa and 27°C with a volume flow rate of 6 m3 /min. The refrigerant-134a at 120 kPa with a quality of 0.3 enters the evaporator at a rate of 2 kg/min and leaves as saturated vapor at the same pressure. Determine the exit temperature of the air and the rate of entropy generation for this process, assuming heat is transferred to the evaporator of the air conditioner from the surrounding medium at 32°C at a rate of 30 kJ/min.
Determine the work input and entropy generation during the compression of steam from 100 kPa to 1 MPa in an adiabatic compressor if the inlet state is saturated liquid in the pump and saturated vapor in the compressor and the isentropic efficiency is 85 percent for both devices.
Air enters the evaporator section of a window air conditioner at 100 kPa and 27C with a volume flow rate of 6 m3/min. The refrigerant-134a at 120 kPa with a quality of 0.3 enters the evaporator at a rate of 2 kg/min and leaves as saturated vapor at the same pressure. Determine the exit temperature of the air and the rate of entropy generation for this process, assuming (a) the outer surfaces of the air conditioner are insulated and (b) heat is transferred to the evaporator of the air conditioner from the surrounding medium at 32C at a rate of 30 kJ/min.
Consider a device into which a gas flows steadily at a constant temperature of 30 °C. Determine the total rate of entropy change, in MW/K, of the total flux through the device, if there is a heat loss of 65 MW Is the process reversible, irreversible, or impossible?
In an ice-making plant, water at 0C is frozen at atmospheric pressure by evaporating saturated R-134a liquid at 216C. The refrigerant leaves this evaporator as a saturated vapor, and the plant is sized to produce ice at 0C at a rate of 2500 kg/h. Determine the rate of entropy generation in this plant.