Carbon Trust, Industrial Refrigeration Equipment Eligible for Enhanced Capital Allowences

Liquid pressure amplification (LPA) involves the use of a pump between the condenser and the expansion valve in a refrigeration system. This pump raises the liquid pressure at the expansion valve allowing the head pressure to be lowered. This reduces the power required by the compressor (increasing the COP) to achieve a given amount of cooling. Many refrigeration systems operate with higher head pressures than necessary. Without controls, head pressures would be lower in mild and colder weather compared with hotter days. However, because of constraints on the pressure, systems generally have controls that maintain the head pressure at high levels by, for example, cycling condenser fans on and off. LPA provides a means of operating at lower head pressures while still satisfying the constraints on liquid pressure. On a typical installation, test data shows that savings of 20% of power use (average over a whole year) are typical. It is estimated that head pressure control is present on some 80% of all installed refrigeration systems.

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