when the load increases the amount of vapor increases , so the pressure inside the evaporator increases and as we r in the wet region inside the evaporator the pressure and the temp. are proportional so the temp. too will increase
but we use some valves to fix this problem , for example thermostatic expansion valve
it helps add more m dot of the refrigerant so the amount of heat from the load will be distributed over a larger mass so the pressure inside the evaporator will remain the same
oppisite side of txv sensing bulb on outlet of evaporator (suction line)
The EPR valve should work reguardless of if the TXV is in the air stream. The TXV in the airflow shouldn't make it act any different since it is sensing the temperature at the bulb instead of at the valve it's self.
None, a TXV operates by it's sensing bulb sensing superheat of the suction line as it exits the evaporator coil.
A: Nothing will happen if the load increases or even removed the voltage will go to the open voltage condition no harm.
A: That will happen anytime the voltage source is not able to provide the power needed for the load. If the load exceed the power available from the source the voltage will be reduced as IR drop from the source
end of the evaporator on the suction line
oppisite side of txv sensing bulb on outlet of evaporator (suction line)
when the load increases the amount of vapor increases , so the pressure inside the evaporator increases and as we r in the wet region inside the evaporator the pressure and the temp. are proportional so the temp. too will increase but we use some valves to fix this problem , for example thermostatic expansion valve it helps add more m dot of the refrigerant so the amount of heat from the load will be distributed over a larger mass so the pressure inside the evaporator will remain the same
when the load increases the amount of vapor increases , so the pressure inside the evaporator increases and as we r in the wet region inside the evaporator the pressure and the temp. are proportional so the temp. too will increase but we use some valves to fix this problem , for example thermostatic expansion valve it helps add more m dot of the refrigerant so the amount of heat from the load will be distributed over a larger mass so the pressure inside the evaporator will remain the same
Temperature is not a pressure or force acting on a TXV diaphragm. The pressure and forces that typically act on a TXV diaphragm are the evaporator pressure, spring force, and spring adjustment. Temperature indirectly influences the operation of the TXV by affecting the refrigerant pressure.
Metering device The metering device controls the flow of liquid refrigerant through the system. The liquid enters at a high-pressure, high-temperature, sub-cooled state and leaves as a low-pressure, low temperature, expanded liquid state. Accurator Piston and Thermostatic Expansion Valves are the most widely used metering devices. Accurator Pistons are widely used because of their low cost and flexibility. The piston can easily be changed to match the capacity of the condensing unit. The Thermostatic Expansion Valve (TXV) is the most efficient type of metering device. The TXV automatically adjusts the flow of the liquid refrigerant based on the superheat of the refrigerant leaving the evaporator coil. As the load on the evaporator increases, the TXV increases the flow of refrigerant. This maintains the proper superheat. The TXV is efficient throughout a variety of system operating conditions, while the accurator is efficient only under designed conditions.
Dual port TXV used when system need a large TXV for short periods of time. Dual-port valves have two independent capacities larger port for periods of high load smaller port for periods of normal load TXV capacity is doubled when larger port is open all the way.
Temperature is not a pressure or force acting on a TXV (Thermostatic Expansion Valve) diaphragm. The TXV diaphragm is primarily influenced by refrigerant pressure and spring force to regulate the flow of refrigerant into the evaporator coil. Temperature affects the superheat setting of a TXV but is not a direct force acting on the diaphragm.
The EPR valve should work reguardless of if the TXV is in the air stream. The TXV in the airflow shouldn't make it act any different since it is sensing the temperature at the bulb instead of at the valve it's self.
It is 2.5 ton with standard non-TXV evaporator coil.
If it's a TXV system, it'll be located between the receiver-drier and the evaporator.
It could be restriction or low charge. Meaning you could have a bad txv valve or not enough refrigerant in the system.