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One way to overcome this limitation in the waterside economizer retrofits on built-up refrigeration systems like the ones found in dairies is to upgrade from TXV to electronic expansion valves (EEVs).
To compare system performance using different control strategies, MSEVs are installed in parallel with the factory -installed TXVs. Additionally, two control algorithms are applied with the MSEVs: 1) the proposed cascaded controller and 2) the default first-generation adaptive PID control (APID) released in early 2014 and provided by the valve manufacturer.
For all tests, the superheat setpoint was 8[degrees]C (14[degrees]F) above saturation, which is the factory default superheat level for the TXVs under these particular operating conditions.
Q: Can I leave the metering device (TXV or piston) and filter driers installed when flushing the system?
Both systems were equipped with a thermal expansion valve (TXV) and a liquid-line receiver.
Individual thermostatic expansion valves (TXV) feeding each coil
As shown in Figure 4, there are three kinds of valves used in TXVs and EXVs.
At each condition, the evaporator exit superheat was controlled by adjusting the TXV to 3-4K (6-7F).
Due to a small difference in mass flow rate of R-134a and XP10 it was necessary to open the TXV to allow a higher mass flow through the valve by about a 1/4 turn or 90[degrees].
There was a 50 psi (34 5 kPa) pressure differential between the condensing and evaporating pressures, which may be on the fringe of acceptable operating conditions for a TXV.
Although most SEER 10 models use a fixed-bore metering device or a capillary-tube device, many SEER 13 models use a Thermal Expansion Valve (TXV or TEV) that meters the flow of refrigerant.