2. When the evaporator is almost full, liquid drops of refrigerant will be present at the outlet of the evaporator and will present an unstable superheat signal. This will result in control hunting problems, which lead to degraded performance.
3. If the evaporator is "over-filled" with refrigerant, liquid will flow back into the suction line, which will lead to degraded system performance and risk of damaging the compressor.
4. This is the minimum stable superheat point. It ensures the evaporator surface is used to the greatest extent possible throughout the cooling process. This maintains the maximum filling of the evaporator surface with liquid refrigerant and maximizes performance, while providing compressor protection to ensure the refrigerant returning to the compressor will be vapor, not liquid.
The second benefit is the ability of the Colibri EEV to have a stable turndown ratio of 90% from maximum capacity, allowing for a much greater range of capacity from a single EEV.
In practice, this means that the evaporator will maintain a minimum stable superheat across the entire cooling process, whether that is blast cooling, blast freezing, or refrigerated storage. This results in optimal evaporator performance and energy savings.
The third benefit is the ability of the EEV to operate independently of head pressure fluctuations. By installing or retrofitting EEVs, the restrictions on lowering condensing pressures are removed. The turndown rate of the Danfoss EEV means that, providing it has been sized for the lowest likely pressure drop, the valve will operate at any pressure drop over and above that. It is precisely this point that differentiates the EEV from its mechanical counterpart, which only operates effectively over a narrow pressure drop range.
The combined benefits make combining an EKE and an EEV an ideal solution to cool or freeze products effectively. Using the latest technology results in faster process times, repeatability, and increased reliability of the refrigeration equipment – at the most energy-efficient levels possible.
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