We see in the lives of everyday physical phenomena that seem simple and without interest, and yet ...Everyone has already seen a pot of boiling water!Well this is what happens in the evaporator of your car, water absorbs heat from the burner to 100 ° (1 bar air pressure) and then vaporizes the refrigerant contained in the evaporator absorbs heat from the air then evaporates (vaporizes the 134a, for a car, at 0 ° and 3 bar abs), this air being churned it emerges from the cold air!
We all at one time or another out a bottle of fresh water from the fridge (not to drink pastis! It is a sin!) That we can point out?Water forms on the bottle, it's happened?Well, in the form of moisture vapor in the air in the room and located closer to the cold bottle had its temperature lowered to pass from the vapor state to liquid state.We speak of condensation!
It happens the same with the refrigerant flowing through the condenser, using fans that churn the air through the condenser, the refrigerant is removed from heat to reach the point where it passes the vapor state, in liquid!
That's all c ... no?
The refrigerant circuit is a closed and sealed so that the state changes, as I just described, occur.
You must use a refrigerant that has adequate physical characteristics among others,it must evaporates at low temperature by absorbing heat.
For circulating the refrigerant compressor is used, the compressor draws vapor (because the liquid is incompressible) from the evaporator and compresses it to send it into the condenser:
Now it gets complicated a bit!
Some of you have heard of "the characteristic equation of ideal gas":
PV / T = constant
where P = pressure, V = volume T = temperature
I'll try to keep it simple: a compressor when the piston rises, the volume decreases in the cylinder so the gas pressure and temperature also increases (shown with a bicycle pump).
The ratio PV / T = constant is met.
If we suddenly releasing the pressure through a throttling valve, the pressure drops, the temperature drops and the volume increases, the ratio is still respected.
DO IN OUT ANY FLAME AWAY
Take a bottle of butane or propane full and open very, very slightly the valve. Put a metal plate to 10 cm in front of the valve for 2 seconds, the plate has become very cold.
The output pressure is low, its temperature and volume also increased (the outer volume is greater than the volume inside the bottle)It happens the same thing with the regulator of your installation:
The refrigeration cycle
1 - Condenser2 - Regulator3 - Evaporator4 - Compressor
Operation:In a refrigeration system fluid is drawn at low pressure and low temperature to the compressor. It is in vapor phase.The compressor compresses the vapor at high pressure and high temperature. The vapors pass from the vapor state in the liquid state in the condenser by evacuating heat. We are still in high pressure (HP) with warm temperatures and 100% liquid.
The fluid passes through the expansion valve where its pressure and its temperature drops, the fluid is in liquid low pressure and low temperature, the fluid passes through the evaporator where it absorbs the ambient heat and spend the liquid state in the vapor state always at low pressure and low temperature and again be sucked by the compressor.
I stop there for now. Feel free to ask questions if you feel the need!
We all at one time or another out a bottle of fresh water from the fridge (not to drink pastis! It is a sin!) That we can point out?Water forms on the bottle, it's happened?Well, in the form of moisture vapor in the air in the room and located closer to the cold bottle had its temperature lowered to pass from the vapor state to liquid state.We speak of condensation!
It happens the same with the refrigerant flowing through the condenser, using fans that churn the air through the condenser, the refrigerant is removed from heat to reach the point where it passes the vapor state, in liquid!
That's all c ... no?
The refrigerant circuit is a closed and sealed so that the state changes, as I just described, occur.
You must use a refrigerant that has adequate physical characteristics among others,it must evaporates at low temperature by absorbing heat.
For circulating the refrigerant compressor is used, the compressor draws vapor (because the liquid is incompressible) from the evaporator and compresses it to send it into the condenser:
Now it gets complicated a bit!
Some of you have heard of "the characteristic equation of ideal gas":
PV / T = constant
where P = pressure, V = volume T = temperature
I'll try to keep it simple: a compressor when the piston rises, the volume decreases in the cylinder so the gas pressure and temperature also increases (shown with a bicycle pump).
The ratio PV / T = constant is met.
If we suddenly releasing the pressure through a throttling valve, the pressure drops, the temperature drops and the volume increases, the ratio is still respected.
DO IN OUT ANY FLAME AWAY
Take a bottle of butane or propane full and open very, very slightly the valve. Put a metal plate to 10 cm in front of the valve for 2 seconds, the plate has become very cold.
The output pressure is low, its temperature and volume also increased (the outer volume is greater than the volume inside the bottle)It happens the same thing with the regulator of your installation:
The refrigeration cycle
1 - Condenser2 - Regulator3 - Evaporator4 - Compressor
Operation:In a refrigeration system fluid is drawn at low pressure and low temperature to the compressor. It is in vapor phase.The compressor compresses the vapor at high pressure and high temperature. The vapors pass from the vapor state in the liquid state in the condenser by evacuating heat. We are still in high pressure (HP) with warm temperatures and 100% liquid.
The fluid passes through the expansion valve where its pressure and its temperature drops, the fluid is in liquid low pressure and low temperature, the fluid passes through the evaporator where it absorbs the ambient heat and spend the liquid state in the vapor state always at low pressure and low temperature and again be sucked by the compressor.
I stop there for now. Feel free to ask questions if you feel the need!
