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Method of Improved defrost efficiency

IP.com Disclosure Number: IPCOM000031223D
Publication Date: 2004-Sep-17
Document File: 1 page(s) / 9K

Publishing Venue

The IP.com Prior Art Database

Abstract

The Problem being solved: Currently, the process of defrosting the evaporator in a no-frost refrigerator consumes a considerable amount of energy. Defrosting is typically performed by a defrost heater located in the vicinity of the evaporator coil. The evaporator coil typically accumulates ice during operation that must be melted in order to remove it. The energy is used to overcome several distinct categories.

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TECHNICAL DISCLOSURE

Subject: Method of Improved defrost efficiency

The Problem being solved:

Currently, the process of defrosting the evaporator in a no-frost refrigerator consumes a considerable amount of energy. Defrosting is typically performed by a defrost heater located in the vicinity of the evaporator coil. The evaporator coil typically accumulates ice during operation that must be melted in order to remove it. The energy is used to overcome several distinct categories.
* The first is the sensible heat for the evaporator and surrounding components as they warm from their operating temperature (less than -10F) to a temperature that thaws ice (32F).
* Second is the sensible heat of the ice as it warms from the same operating temperature (less than -10F) to a temperature that thaws ice (32).
* Third is the heat of fusion for the ice that has melted and fourth is the heat required to increase the coil temperature to the defrost termination temperature at the calibrated defrost termination switch.

The current sequence of defrost operation is as follows:

1) the defrost timer calls for defrost
2) optionally, the compressor continues to run for 2 hours to cool the food down
3) the compressor turns off
4) the heater turns on
5) the thermostat on the evaporator warms up to 32 and stays until the ice is melted
6) the thermostat increases further to the defrost termination temperature

This invention discloses a method of reducing the energy required in the first cate...