Carrier Corporation

Sylvain Serge Douzet

Tobias H Sienel

Yu Chen

Julio I Concha

Joseph Ballet

Nicolas Pondicq-Cassou

Jean-Philippe Goux

Wahil Said

Refrigerant is circulated through a vapor compression system including a compressor, a gas cooler, an expansion device, and an evaporator. When a sensor detects that frozen water droplets form on the evaporator, a valve positioned between the discharge of the compression and inlet of expansion device is opened. Refrigerant from the discharge of the compressor bypasses the gas cooler and enters the inlet of the expansion device. The high temperature refrigerant melts the frost on the evaporator. As the frost melts, the passage of the evaporator is opened to allow air to flow through the evaporator.

Defrosting methodology for heat pump water heating system

A control algorithm controls a coil defrosting cycle on a reversible heat pump by storing values representing performance of a clean coil, i.e., one with no frost build-up, and monitoring those values as they evolve over time. The values are used to create a &ldquo;frost factor&rdquo; whose value varies between 0%, signifying a clean coil, and 100%, signifying a heavily frosted coil. When the frost factor reaches a predetermined value close to 100%, the refrigerant cycle of the heat pump is inverted (reversed) to achieve coil defrosting.

Method and system for defrost control on reversible heat pumps

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Saint Maurice de Beynost, France

Sylvain Serge Douzet