Patent ID: 8387687

Claim:
An enclosure containing heat-producing equipment, comprising: an air inlet for admitting ambient air from an environment containing the enclosure, the air from the environment being at an ambient temperature, the equipment being situated relative to the air inlet such that the air absorbs heat from the equipment, thereby increasing the temperature of the air to a second temperature; an air outlet for expelling the air heated to the second temperature from the enclosure; an air-to-liquid heat exchanger mounted on an outside surface of the enclosure adjacent to the air outlet, the heat exchanger connected to an external cooling source and configured such that heat added by the equipment to the air exiting the enclosure is absorbed by the heat exchanger and is expelled outside the environment containing the enclosure and lowers the temperature of the air to the ambient temperature; a modulating valve for regulating cooling liquid flow through the heat exchanger; and a temperature sensor for sensing temperature of the air and a temperature controller for modulating the valve in response to the temperature of the air.