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Electronic expansion valves
Electronic valves work the same with thermostatic valves, except that the temperature felt in electronic form, and this signal is used to open and close the holes by heating the liquid (similar to the thermostatic expansion valve), or take a small electric drive. This form of control is much more precise and valve can, therefore, work with a wide range of condensation and evaporation pressure. Another advantage is that they can be easily integrated with the electronic and microprocessor control system.
Electronic lamps are more expensive than the other types and payback can be attractive only on large systems. Good Practice Case Study 302 Increase the productivity of the refrigeration using electronic expansion valves explains the benefits, and showed that, using this type of valve evaporators with direct expansion in the medium cold gave a payback period of 1.4 years...
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