To find the pressure at the inlet of the evaporator, you subtract the pressure drop from the low side pressure. Given a low side pressure of 15 psig and a pressure drop of 10 psig, the inlet pressure would be 15 psig - 10 psig = 5 psig. Therefore, the pressure at the inlet of the evaporator is 5 psig.
In a venturimeter, the pressure is lower at the throat than at the inlet due to the principle of conservation of energy and Bernoulli's equation. As fluid flows through the venturi tube, it accelerates in the throat, leading to an increase in velocity and a corresponding decrease in pressure. This phenomenon occurs because the cross-sectional area is smaller at the throat, causing the fluid to speed up, which results in a drop in static pressure according to Bernoulli's principle. Thus, the pressure at the throat is lower than at the inlet.
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To convert the differential pressure of 43 psi to absolute pressure, you would add the atmospheric pressure to the differential pressure. On average, atmospheric pressure at sea level is about 14.7 psi. So, adding 43 psi to 14.7 psi gives an absolute pressure of approximately 57.7 psi.
Let me differentiate first between design pressure and mechanical design pressure. Design (or discharge) pressure is the pressure at the outlet of the pump, the pressure you've designed the pump to deliver. The mechanical design pressure is a value that the pump casing and downstream piping have to be able to withstand as a minimum*. I presume you mean design pressure as discharge pressure. In this case, differential pressure is the difference between the discharge pressure and the suction pressure (the pressure at the inlet of the pump**). * this is calculated taking into account that a pump would be working against a 'blocked discharge' or a closed valve in the outlet piping ** imagine a reservoir filled with liquid
The regulator has an inlet and outlet. There is a valve at the inlet typically called a seat valve or similar. This seat is linked to a diaphragm. This diaphragm separates the upper and lower halves of the regulator body and also serves as the gasket for the two halves. On top of the diaphragm is a spring, below is the inlet seat. When no appliances are in use the lower section fills with gas, pushes the diaphragm up which seats the inlet valve and stops gas flow into the regulator. When an appliance is turned on, the gas flows out of the regulator and down the pipe to the appliance. When this happens the diaphragm lowers, opens the seat valve and gas once again flows. The seat valve has an orifice to reduce the speed at which the upstream gas enters the regulator, and the diaphragm spring determines how much pressure it takes to close the seat.
For most AC systems, the outlet of the expansion valve or orifice tube is where the low pressure side begins, which includes the evaporator and the inlet of the compressor. In between the metering device outlet and the compressor inlet, you'll have the evaporator. In a Fixed Orifice Tube system, the accumulator will also be on the low pressure side.
I am not exactly sure of what you are asking but there is not an evaporator valve. There is an evaporator core that resembles a radiator and there are not any parts that can stick. The only problem they have is leaking. There is an orfice that goes in the inlet to the evaporator and it has no moving parts.It can get stopped up and cause the high side pressure to get higher than normal.
The orfice tube is located in the evaporator inlet tube. There is also an expansion valve in the rear evaporator case.
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Between the receiver-drier outlet and the evaporator inlet.
It starts at the outlet valve of the metering device and ends at the inlet valve of the compressor. The evaporator is on the low pressure side of the system, as is the accumulator, if your vehicle has a Fixed Orifice Tube system.
It is located in the inlet side of the evaporator.
It is located in the inlet tube of the evaporator between the outlet of the condenser and the inlet of the evaporator. This point can be found in a properly functioning system by locating the area between the outlet of the condenser and the inlet of the evaporator that suddenly makes the change from hot to cold. You can see small dimples placed in the line that keep the orifice tube from moving inside the tube. It is located just a few inches outside of the condenser in the tube.
Inlet pressure/discharge pressure
Some are in the inlet to the evaporator and some could be in the condenser line.
In the inlet line on the evaporator core. It is the smaller one.
In an air conditioning system which uses a Fixed Orifice Tube, the accumulator is located on the low pressure (vacuum) side, between the evaporator outlet and the compressor inlet. The accumulator ensures that all the refrigerant which goes into the compressor inlet is in a vapor state, and prevents any refrigerant which is still in a liquid state from getting through.