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Multidiscipline engineering System Development:

¡Nakayama Engineering K.K.

Main Officee/
7-5 1-chome,Tozuka,Kawaguchi City,Saitama Prefecture Japan

Tel F 81-48-295-2010

 Conventional freezing systems Limited by technology

Picture expansion

 

Managing Low condensing Pressure and Small TD are the keys to better freezing

Normally, condensing pressure is designed to maintain a certain minimum level that avoids system problems. When operated at a condensation pressure of 0.9MPa to 1.1MPa or less the refrigerant conditions within the evaporator become so degraded that the refrigerant starts to backflow, damaging the refrigerator unit. Cooling capacity is also drastically reduced. As a result systems are designed and operated at higher pressures requiring more power input. Also, when the temperature difference (TD) between the refrigerant and the ambient air is less than 10Cthe system cannot produce sufficient freezing due to poor refrigerant controls and results in reduced efficiency.Both these conditions require the system to be operated in away that cannot take advantage of low ambient air temperature. So this energy saving synergy is lost. .

œHigh condensation pressure: No energy savings from low outdoor temperatures
œLow condensation pressures aggravate distribution within the evaporator, causing failure
œReduced capacity due to frost on the evaporator, and energy loss due to frequent defrosting
œIncreased sublimation within the product by exposure to high temperature differentials causes quality deterioration due to drying

tk = condensation temperature
TD = temperature differential between the refrigerant evaporation and the ambient air

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