Ambient air cooling system

Claim 2

Cooling apparatus for an enclosure comprising: a refrigeration system comprising a compressor, condenser and evaporator interconnected in refrigerant flow relationship, said evaporator being located within the area of said enclosure to be cooled; a first thermostat responsive to the temperature within said area to be cooled and operative to actuate said refrigeration system at a predetermined, upper temperature level and to deactivate said refrigeration system at a predetermined, intermediate temperature level below said upper temperature level; air flow passage means connecting the interior of said enclosure with the outdoors; fan means positioned to draw ambient air into said enclosure and said area to be cooled from the outdoors through said air flow passage means; a second thermostat responsive to the temperature within said area to be cooled and operative to actuate said fan means at said intermediate temperature level and to de-energize said fan means at a predetermined, low temperature level below said intermediate temperature level; and an outdoor temperature sensor responsive to ambient air temperature and operative to energize said second thermostat and render it operative to actuate said fan means at a predetermined ambient temperature less than said intermediate temperature level.

Claim 3

Cooling apparatus as defined in claim 1 wherein: motorized, damper means are positioned in said air flow passage means to control the flow of ambient air therethrough, said motorized damper means being connected in a control circuit with said second thermostat for actuation to an open position at said intermediate temperature level and for movement to a closed position at said low temperature level in response to the sensing of said intermediate and low temperature levels by said second thermostat.

Claim 4

Cooling apparatus as defined in claim 2 wherein: said enclosure further includes at least one exhaust aperture communicating the interior thereof with the outdoors at a location spaced from said air flow passage means; and motorized, exhaust damper means positioned adjacent said exhaust aperture, said exhaust damper means being connected in said control circuit with said second thermostat for actuation to an open position at said intermediate temperature level and for movement to a closed position at said low temperature level in response to the sensing of said intermediate and low temperature levels by said second thermostat.

Claim 5

Cooling apparatus as defined in claim 1 wherein: said enclosure has a plurality of zones to be cooled; separate, air flow passage means connecting the interior of said enclosure within each of said zones to be cooled from the outdoors; separate fan means positioned to draw ambient air into each of said zones to be cooled from the outdoors through said separate, air flow passage means; and a separate thermostat in each of said zones to be cooled responsive to the temperature therein and connected in a control circuit with said outdoor temperature sensor and its respective fan means, each of said separate thermostats being operative to actuate its respective fan means at said intermediate temperature level and to de-energize said fan means at said low temperature level, whereby the temperature in each of said zones to be cooled may be independently controlled between said intermediate and low temperature levels by said separate thermostats.

Claim 6

Cooling apparatus for an enclosure comprising: a first zone to be cooled within said enclosure; air flow passage means connecting the interior of said first zone with the outdoors; first fan means positioned to draw ambient air into said first zone of said enclosure through said air flow passage means; a first thermostat responsive to the temperature within said first zone and operative to actuate said first fan means to draw ambient air into said first zone at a predetermined temperature level and to de-energize said first fan means at a predetermined, lower temperature level; a second zone to be cooled within said enclosure; second air flow passage means connecting the interior of said second zone with the outdoors; second fan means positioned to draw ambient air into said second zone of said enclosure through said second air flow passage means; a second thermostat responsive to the temperature within said second zone and operative to draw ambient air into said second zone at said predetermined temperature level and to de-energize said second fan means at said predetermined, lower temperature level; and an outdoor temperature sensor responsive to ambient air temperature and connected in a control circuit with both said first and second thermostats, said outdoor temperature sensor being operative to energize both of said thermostats to render them operative to actuate either or both of said fan means to draw ambient air into either or both of said zones to be cooled at a predetermined ambient temperature less than said predetermined temperature at which said thermostats are set to actuate said first and second fan means.

Claim 7

Cooling apparatus for an enclosure comprising: a first zone to be cooled within said enclosure; air flow passage means connecting the interior of said first zone with the outdoors; first fan means positioned to draw ambient air into said first zone of said enclosure through said air flow passage means; a first thermostat responsive to the temperature within said first zone and operative to actuate said first fan means to draw ambient air into said first zone at a predetermined temperature level and to de-energize said first fan means at a predetermined, lower temperature level; a second zone to be cooled within said enclosure; second air flow passage means connecting the interior of said second zone with the outdoors; second fan means positioned to draw ambient air into said second zone of said enclosure through said second air flow passage means; a second thermostat responsive to the temperature within said second zone and operative to draw ambient air into said second zone at said predetermined temperature level and to de-energize said second fan means at said predetermined, lower temperature level; and an outdoor temperature sensor responsive to ambient air temperature and connected in a control circuit with both said first and second thermostats, said outdoor temperature sensor being operative to energize both of said thermostats to render them operative to actuate either or both of said fan means to draw ambient air into either or both of said zones to be cooled at a predetermined ambient temperature less than said predetermined temperature at which said thermostats are set to actuate said first and second fan means.

Claim 8

Cooling apparatus for an enclosure as defined in claim 5 wherein: said cooling apparatus further comprises a refrigeration system comprising a compressor, condenser and evaporator means interconnected in refrigerant flow relationship, said evaporator means being located within said first and second zones to be cooled; and a refrigeration system control thermostat responsive to the temperature within said zones to be cooled and operative to actuate said refrigeration system at a predetermined, upper temperature level and to deactivate said refrigeration system at a predetermined, intermediate temperature level the same as said predetermined temperature level at which said first and second thermostats are set to actuate said first and second fan means.