Patent ID: 8418484
Filing Date: 2013-04-16
Classification: F25B,F25D,F28D,F28F

Abstract:
1. A refrigeration system having a heat exchanger for exchanging heat between a gas and coolant, the heat exchanger comprising: a tubing having at least one coolant passage wound into a helical coil having a space between turns of the coil; a blower for passing the gas through the space between turns of the coil; apparatus for altering the coil from a first state wherein the space between turns of the coil is narrow into an altered state, the altered state having an increased space between turns of the coil; and apparatus for detecting obstruction of gas flow through the space between turns of the coil, and for activating the apparatus for altering the coil from the first state to the altered state when gas flow is obstructed; apparatus for determining when the coil is in a maximally altered state, and for activating a defrost cycle of the refrigeration system when the coil is in a maximally stretched state; wherein the space between turns of the coil is less than two millimeters wide when the coil is in the relaxed state.