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The evaporating pressure is 76 psig for r 22 and evaporator outlet temperature is 58 degree f. what is evaporator superheat for this system?
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How do you measure fre-on?
On smaller residential air conditioners the manufacturer publishes a charging chart that has the outside air temperature and the corresponding suction and liquid pressure measured by a refrigeration manifold set, gauges. If the chart is not available, you can estimate by measuring the suction pressure and then using a pressure temperature chart for your refrigerant and trying to maintain a 35 degree to 40 degree temperature at the condensing unit or compressor. The other measurement on larger units is the subcooling measurement, measure the actual liquid line temperature and compare the liquid pressure using a pressure temperature chart and also checking for bubbles in the liquid line sight glass. On larger systems after the subcooling has been checked then the superheat has to be checked and the thermostatic expansion valve adjusted if necessary. To check the superheat, measure the suction pressure, convert to a temperature and then measure the actual suction line temperature. The difference is the superheat, should be 6 to 20 degrees depending on the system.
Is suction pressure another word for evaporator saturation pressure?
Yes
Where does the pressure in a refrigeration system change?
at the metering device before the evaporator
What is the purpose of an externally equalized thermal expansion valve?
compensates for excessive evaporator pressure drop
Explain the capillary tube type refrigerant control?
capillary tube are classified under fixed oriffes metering device it is thin and long inorder to control the refrigerant pressure and temperature not to evaporate ontheir way unitl it reach the evaporator.
If the evaporator outlet temperature on a r-410a system is 50p and the evaporator superheat is 10p, what is the evaporating pressure of the refrigerant in this system?
8.2
What is the evaporator superheat for the evaporating pressure 76 psig for R-22 and the outlet temp of 58 F?
it should be 17
If the total evaporating pressure was 76 psig for r-22 and the compressor inlet temperature was 65 F what would be the total superheat entering the compressor?
I'm not an HVAC expert or anything I'm just starting to get into it but if my math is correct I believe that your total superheat would be 20 degrees. Double check though
What is the purpose of the external equalizer on a TXV?
The purpose of the External equalizer on the TXV is to compensate for the pressure drop in the evaporator coil , This is done since the superheat calculation is based on the difference in the Saturation temperature corresponding to the Suction pressure (Measured after the coil) and the actual suction line temperature. Now, in a TXV measurement of actual line temperature is accomplished by using the Sensing Bulb and the Measurement of the Suction pressure by the External Equalizer of the TXV. The opening/Closing of the Expansion valve is controlled by the setting of the superheat which is governed by the setting of the Spring.
What is the superheat if the suction pressure is 60 psig and the suction line temperature is 40 degrees?
-5 something is wrong
When throttle a steam valve what happens to volume pressure and superheat?
theoritically degree of supermheat increase but practically no change in temperature.
At what location in a refrigeration system does the Saturation pressure correspond with the saturation temperature?
Compressor and evaporator
How are evaporating and boiling the same?
Evaporation and boiling is similar as they both deal with temperature and pressure. They are both dependent upon the atmospheric pressure.
How do you measure fre-on?
On smaller residential air conditioners the manufacturer publishes a charging chart that has the outside air temperature and the corresponding suction and liquid pressure measured by a refrigeration manifold set, gauges. If the chart is not available, you can estimate by measuring the suction pressure and then using a pressure temperature chart for your refrigerant and trying to maintain a 35 degree to 40 degree temperature at the condensing unit or compressor. The other measurement on larger units is the subcooling measurement, measure the actual liquid line temperature and compare the liquid pressure using a pressure temperature chart and also checking for bubbles in the liquid line sight glass. On larger systems after the subcooling has been checked then the superheat has to be checked and the thermostatic expansion valve adjusted if necessary. To check the superheat, measure the suction pressure, convert to a temperature and then measure the actual suction line temperature. The difference is the superheat, should be 6 to 20 degrees depending on the system.
How do you use the temperature pressure table when measuring suction pressure on your split system air conditioner?
i think you subtract the evaporator temp from the outside temp?
What is liquid boil?
The temperature at which the pressure of the evaporating liquid equals the atmospheric pressure of the surroundings. For pure water at sea level on earth, this is 100 degrees celsius.
What role does a compessor play in a refrigeration system?
In vapour compressor refrigeration system the low pressure and temperature vapour refrigerant from evaporator is compressed. where it is compressed to a high pressure and temperature. From compressor refrigerant goes to condenser where where it changes the phase. from condenser refrigerant goes to evaporator through expansion device.
