11 - 13 October 2016 // Nuremberg

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Electronic Expansion Valve

LOGO_Electronic Expansion Valve

Electronic Expansion Valve

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A new hi-tech feature from MasterTherm CZ
The use of an electronically controlled expansion valve shifts our product line to a whole new level. The electronic valve improves the efficiency (heat factor) of the heat pump and its operational reliability and it also extends the lifespan of the equipment. This hi-tech feature makes the production, installation and servicing of our products a much simpler process. In the world of heat pumps, the electronic expansion valve is the greatest technical advancement since the introduction of scroll-type compressors.

An EEV optimizes the efficiency of the heat pump.

  • The EEV optimizes the use of the evaporator, which vaporizes the coolant. As a result, less energy is required for the overheating process, which increases the heat output and the heat factor of the heat pump (provided the evaporator is properly sized to handle the requirements of the system).
  • With the use of the same evaporator, the evaporation pressure of the R407 coolant is higher by about 0.5 bar compared to the use of a thermostatic expansion valve (TEV). This has yet another benefit – less buildup of frost resulting from the moisture in the air, less energy required for the defrost cycle and less time required to complete the defrost cycle.
  • An optimally adaptable system – especially at lower temperatures. Whenever the temperature of the heating water drops below 35 °C (which is quite common in underfloor and wall heating systems), this results in a drop in the evaporation pressure in the TEV and a reduction in heat output and heat factor. This could never happen with an EEV (the heat pump has to be capable of operating within an outside temperature range of +30 to -20 °C and a heating water temperature range of 25 to 50 °C – a TEV-based system could not handle this and remain fully efficient at the same time).

An EEV = simpler design, production and installation.
The entire system is based on the replacement of mechanical and thermomechanical components with the latest electronic components. In terms of the actual cooling cycle, This significantly simplifies the entire system. This is because the TEV, the magnetic valve and the reverse valve are all replaced with a single component – the EEV. This means that there is less soldering and fewer components, which effectively translates into fewer errors and technical problems during manufacturing and installation.

An EEV improves the products overall operational reliability.
Fewer components = a reduced chance of technical failures. Even though the electronics in the valve can sometimes malfunction, should that ever happen, the valve can be quickly replaced without tampering with the cooling cycle.

An EEV extends the lifespan of the compressor.
The lifespan of the compressor is extended due to the fact that it is exposed to much less operating stress. The reduced suction overheating forces the lower temperature of the discharged vapors out of the compressor, which means that there is a reduced pressure difference. As a result the compressor is exposed to much less stress.

An EEV reduces the noise level of the exterior unit.
When the outside temperature drops to -15 °C and the temperature of the heating water is 50 °C, the activation of the reverse valve produces a loud noise. By releasing the coolant in a controlled fashion, the EEV is able to practically equalize this difference in pressure, which significantly reduces the result noise.

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