R-134a first flows through an adiabatic throttle valve and then into an adiabatic separator. Before the throttle valve, the refrigerant is at 1.2 MPa and 38\deg C and the mass flow is 1.75 kg/s. The throttle valve reduces the pressure to 100 kPa. This is also the pressure in the mass flows of steam and liquid out of the separator. a) Draw a sketch of the device (remember to look at numbers for conditions and relate to these i your symbol usage) and calculate the total volume flow of R134a ( through the throttle valve) i m3 /p. b) What is the temperature (\deg C) and the volume flow (m 3/s or liter/s) of the refrigerant immediately after throttle valve (before inlet to separator)? c) What are the mass flows of the liquid phase and the gas phase out of the separator in kg/s?

R-134a first flows through an adiabatic throttle valve and then into an adiabatic separator. Before the throttle valve, the refrigerant is at 1.2 MPa and 38\deg C and the mass flow is 1.75 kg/s. The throttle valve reduces the pressure to 100 kPa. This is also the pressure in the mass flows of steam and liquid out of the separator. a) Draw a sketch of the device (remember to look at numbers for conditions and relate to these i your symbol usage) and calculate the total volume flow of R134a ( through the throttle valve) i m3 /p. b) What is the temperature (\deg C) and the volume flow (m 3/s or liter/s) of the refrigerant immediately after throttle valve (before inlet to separator)? c) What are the mass flows of the liquid phase and the gas phase out of the separator in kg/s?

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

Chapter40: Typical Operating Conditions

Section: Chapter Questions

Problem 10RQ: The seasonal energy efficiency ratio (SEER) includes the energy used in the _____and _____cycles.

See similar textbooks

Similar questions

b) A steam turbine that uses refrigerant 134-a as the working fluid is passed through a diffuser. The state of refrigerant before entering the diffuser is saturated vapor and the inlet conditions are 600 kPa and 200 m/s. The refrigerant leaves the diffuser at 800 kPa and 40 °C. If the exit area is 70% larger than the inlet area of the diffuser, 1) Compute the velocity of refrigerant at the exit 11) If the diffuser is found to be losing heat at a rate of 10 kJ/s throughout the process, compute the mass flow rate of the refrigerant
iii) the exit area of the nozzle. Take Cp = 1.005 kJ/kg-K and R=287 J/kg-K Q.B3. A heat engine operates between two reservoirs at 400°C and 30°C. Half the power produced by the heat engine is used to drive a Carnot heat pump that removes heat from the cold surroundings at 2°C and transfers it to a house maintained at 27°C. The heat engine is absorbing heat at a rate of 5 kJ/s. i) Draw the complete schematic of the device ii) Determine the thermal efficiency of the heat engine iii) Determine the coefficient of performance of the heat pump iv) Determine the rate of heat loss from the house. v) Determine the minimum rate of heat extraction by the heat pump, and vi) the total rate of heat rejection.
Air with a pressure of 0.1 MPa and a temperature of 25oC with a flow rate of 5.29 kg/minute enters a three-stage reciprocating piston compressor with intercooler. The air is compressed polytropically (n = 1.3) to reach the pressure of 4 MPa. Calculate: a) The amount of heat transferred to each intercooler? b) How much air is needed for cooling in the intercooler if the allowable maximum temperature changes between the inlet and outlet of the intercooler is 8oC?
1. Air enters a reversible compressor steadily and it is compressed from an inlet temperature and pressure of 20 deg C and 100 kPa respectively. Air leaves the compressor at 900 kPa.Compute the compressor power assuming a mass flow rate of air of 1.25 kg/sec. w
Pls answer thank you! Steam enters the turbine at the rate of 2.5 kg/s with enthalpy of 3200 kj/kg and exhaust enthalpy of 1100 kj/kg . Steam is extracted from the turbine at the rate of 1 kg/s for heating purposes with enthalpy of 2750 kj/kg. What is the turbine work in KW.
i . A gas well is flowing at a flow rate of 1.2x105scf/d with the surface pressure of 500psi and compressor inlet pressure of 100psi. Calculate the horse power requirement.
b- An evacuated tank ,shown if fig of 1 ft3 is coupled to air supply line through valve .When the valve is opened, the air flow from supply line at 70°F,120 psi until the pressure reaches 90psi . calculate the final temperature and mass inside tank ,assuming the process is adiabatic. R= 53.34 Ibf-ft/lbm °R use the table below in case. Alr supply line Tank Idcat-Gas Propertiles of Air (English Units)0, Standard Entropy at 1 atm = 161.325 kPa = 14.696 1bf/in.² (R) (Btulbm) (Btu/lbm) (Btu/lbm R) (R) (Btu/lbm) (Btu/lbm) (Btu/Ibm R) 400 68.212 95.634 1.56788 1950 357.243 490.928 1.96404 440 75.047 105.212 1.59071 2000 367.642 504.755 1.97104 480 81.887 114.794 1.61155 2050 378.096 S18.636 1.97790 520 88.733 124.383 1.63074 2100 388.602 532.570 1.98461 536.67 91.589 128.381 1.63831 2150 399.158 546.554 1.99119 540 92.160 129.180 1.63979 2200 409.764 560.588 1.99765 560 95.589 133.980 1.61852 2300 431.114 588.793 2.01018 600 102.457 143.590 1.66510 2400 452.640 617.175 2.02226 1000 172.564…
An air cooled refrigerant condenser (similar to the ones used for home air conditioners) is shown, The system condenses 0.1 kg/sec of 60 C R134A refrigerant. Air temperature rises by 5 C passing over the coils. Calculate the mass flow rate of air pushed through the condenser.
8. A turbine passes 67.5 kg/h of steam at 200 km/h at 8 MPa and leaves at 0.5 MPa as wet steam with a speed of 90 km/h and a specific volume of 0.189 m3/kg. d. What must be the steam input conditions (T,H) to turn on a device that consumes 30 kW? and. What is the mass and volumetric flow rate of the water at the outlet? F. What is the input and output area?
Q3: A distillation column is separating acetone(more volatile component) from ethanol. As pictured, there are two feeds with flow rates F₁=100 mol/hr and F₂-200 mol/hr. Feed 1 has z₁-0.7 and is saturated liquid. Feed 2 has z2 0.4 and is a superheated vapor (q=-0.1) where approximately 1 mol of liquid will vaporize on feed stage for each 10 mol of feed. We desired xd-0.95 and xw-0.05. How many stages are needed to achieve this separation? Ln/Vn=0.64.
8. . Equation for Law of conservation of mass and energy for a nozzle is
5) An auditorium is designed to seat 4500 people. The ventilation rate is 1.62 x 107 ft3/hr of outside air. The outside temperature is 0oF dry bulb, and outside pressure is 14.6 psia. Air leaves the auditorium at 70oF dry bulb. There is no recirculation. The furnace has a capacity of 1,250,000 Btu/hr. The temperature at which the air should enter the auditorium is most nearly