Table of Contents
- 1 How do you determine the quality of refrigerant?
- 2 What is the specific volume of R134a at?
- 3 What is the density of r134a?
- 4 How do you find the phase of R134a?
- 5 What is the evaporation temperature of R 134a at 0 psig?
- 6 How does the refrigerant R-134a enter and exit the system?
- 7 What is the air pressure on a 134r134a?
How do you determine the quality of refrigerant?
In thermodynamics, Vapor Quality is the mass fraction between vapor and liquid/vapor in a saturated wet mixture; i.e. saturated vapor has a quality of 1.0, and pure liquid has a quality of 0. Quality “X” can be calculated by dividing the mass of the vapor by the mass of the total mixture.
What should pressures be on a 134a cooler?
22 pounds per square inch
For normal running pressures in the R134a system, at the lowest temperature, the coil should run at 22 pounds per square inch that is 45-20, 25 degrees Fahrenheit. While at the highest temperature it should be 57 pounds per square inches that is 60-20,40 degrees Fahrenheit.
What is the specific volume of R134a at?
R-134a Properties – Imperial Units
| Temperature (oF) | Pressure (psia) | Specific Volume Vapor (cu.ft./lb.) |
|---|---|---|
| 50 | 60.032 | 0.781 |
| 75 | 93.080 | 0.507 |
| 86 | 111.321 | 0.424 |
| 100 | 138.28 | 0.340 |
What is the condensing temperature of R134a?
That fact explains why compressor manufacturers limit the condensing temperature for R407C to around 145–150°F (60°C–65°C) whereas for R134a compressors, the top limit for condensing temperature is 158–175°F (70–80°C) for air condi- tioning applications.
What is the density of r134a?
4.25 kg/m³
1,1,1,2-Tetrafluoroethane/Density
What should my gauges read on R134a?
It can be used for recharging refrigerant, or to diagnose an a/c system based on pressure readings from your gauges….R134a Pressure Gauge Chart.
| Ambient Temperature (°F) | Low Side | High Side |
|---|---|---|
| 80° | 45-50 psi | 175-220 psi |
| 75° | 40-45 psi | 150-175 psi |
| 70° | 35-40 psi | 140-165 psi |
| 65° | 25-35 psi | 135-155 psi |
How do you find the phase of R134a?
In this case, we can check the phase by comparing the temperature with the saturation temperature at the given pressure using the R-134a-Pressure Table within SLVM_Table. Since the given temperature for state 4 is lower than the saturation temperature, then the R134a is a compressed liquid.
Is refrigerant 134a compressible?
Fluid Phase Equilibria, 78: 323-329. The compressibility factors of HFC-134a (1,1,1,2-tetrafluoroethane) have been measured by using a Burnett apparatus at temperatures of 320, 330 and 340 K, and pressures from 0.13 to 1.93 MPa. The uncertainty of the compressibility factors is estimated as being less than ±0.2\%.
What is the evaporation temperature of R 134a at 0 psig?
-15°Fahrenheit.
The evaporation temperature of R134a at 0 psig is -15°Fahrenheit.
What temperature does refrigerant evaporate?
40F
A refrigeration evaporator is operating with R-22 refrigerant at 69 PSIG suction pressure; its saturation temperature is 40F. This is the temperature at which the refrigerant evaporates from liquid into vapor.
How does the refrigerant R-134a enter and exit the system?
Refrigerant R-134a enters the compressor of an ideal vapor-compression refrigeration system as saturated vapor at -10oC and leaves the condenser as saturated liquid at 35oC. For a cooling capacity of 20 kW, determine (a) the mass flow rate, (b) the compressor power in kW and (c) the coefficient of performance.
Why is it important to know the R-134a level?
Understanding the pressure that your system is at as well as knowing what the saturation point is of R-134a will allow you to properly diagnose what is wrong with your system. Remember, that air conditioning is basically changing the pressure on the refrigerant until a state change is reached.
What is the air pressure on a 134r134a?
R134a Pressure Gauge Chart Ambient Temperature (°F) High Side 110° 335-345 psi 105° 325-335 psi 100° 300-325 psi 95° 275-300 psi
What is the chemical stability of Freon 134a?
Both species are typically measured in the low parts per million (ppm) range. As the CFC-12/mineral oil combinations have been proven in actual service, these tests indicate that Freon™ 134a/ PAG and Freon™ 134a/POE solutions have acceptable chemical stability.