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Liquid Overfeed Systems - ASHRAE HANDBOOK 2006

Overfeed systems force excess liquid, either mechanically or by gas pressure, through organized-flow evaporators, separate it from the vapor, and return it to the evaporators.

Low-pressure receiver. Sometimes referred to as an accumulator, this vessel acts as the separator for the mixture of vapor and liquid returning from the evaporators. A constant refrigerant level is usually maintained by conventional devices.

Pumping unit. One or more mechanical pumps, or gas-operated liquid circulators are arranged to pump overfeed liquid to the evaporators. The pumping unit is located below the low-pressure receiver.
Wet returns. These are connections between the evaporator outlets and low-pressure receiver through which the mixture of vapor and liquid overfeed is drawn.

Liquid feeds. These are connections between the pumping unit outlet and evaporator inlets.

Flow control regulators. These devises regulate overfeed flow into the evaporators. They may be needle valves, fixed orifices, calibrated manual regulating valves, or automatic valves designed to provide a fixed liquid rate.

Dehumidification and cooling system cuts energy consumption by 43% in meat processing plant - August 13, 2009
Cooling and dehumidification costs in a meat plant in Germany have been reduced by a system using hot and cold water from other processes. According to DuCool, TönniesFleisch plant in Rheda-Wiedenbrück is saving annually 165 000 € in electricity costs (1.5 year payback) while improving working conditions, reducing safety hazards and prolonging equipment lifespan, thanks to their DuHandling system. TönniesFleisch recently added a new wing to its plant in Rheda-Wiedenbrück, which contains a washing and cleaning system that creates a high level of humidity, causing hazardous and uncomfortable working conditions as well as corrosion to equipment. Engineers from the company determined that 30 000 m3 clean air per hour would be necessary to keep humidity at reasonable levels if a conventional air conditioning system were used. But the system applied uses 6 DuHandling units that uses waste heat to generate cooling and dehumidification with a small post-treatment air handling unit that is much smaller than would be needed in a conventional solution. The unit dehumidifies the space, prevents growth of mould and mildew and maintains the required conditions of 22°C and 50% relative humidity, while using approximately 40% less energy than a conventional air-conditioning system.


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