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For Commercial Air Conditioning, Sanhua will introduce the SHF350/420 series of large single body 4-way heat pump reversing valves and the VPF series of commercial electronic expansion valves (EEV).
Electronic expansion valves, instead of conventional pressure-actuated valves, compensate automatically for load variations and ambient conditions.
While the use of the electronic expansion valve allows for energy saving control strategies, the complexity of this subassembly requires a larger bill of materials and extra effort in fabrication when compared to a simple piston expansion device integrated into a check valve.
According to Master-Bilt, the master controller on the walk-in refrigeration system offers up to 15% energy savings due to the electronic expansion valve and demand defrost feature.
A new electronic controller from Danfoss, used in conjunction with the company's electronic expansion valve, and a plate heat exchanger, can deliver liquid at a temperature or delta-t selected by the user.
In addition, there's demand for component technologies that improve the operational cost or performance of existing HVAC equipment, including variable speed compressors, electronic expansion valves, advanced humidity removal, heat recycling, variable frequency drives, and thermal energy storage.
The unit was tested in heating mode in psychrometric chambers with two indoor units and steady state data were used to train the compressor and electronic expansion valve (EEV) model, to estimate the control algorithm of the opening of the expansion valve and to tune the refrigerant charge for the system model.
Also, electronic expansion valves, rare at this low capacity end of the market, ensure precise capacity control.