A two chamber heat transfer unit configured such that hazardous air can circulate through one of the chambers and potential ignition source components are contained in another chamber through which the gas to be heated or cooled will circulate.
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1. A heat transfer unit for use in a location where heat will be transferred by the unit from a heat source in an enclosure to ambient hazardous air, the heat transfer unit comprising: a housing comprising a first compartment, configured for coupling to and removing heat from the enclosure, the firs
1. A heat transfer unit for use in a location where heat will be transferred by the unit from a heat source in an enclosure to ambient hazardous air, the heat transfer unit comprising: a housing comprising a first compartment, configured for coupling to and removing heat from the enclosure, the first compartment having therein an evaporator,a motor, andany other potential ignition source within the heat transfer unit;a second compartment comprising an ambient hazardous air inlet, an ambient hazardous air outlet, a condenser and an ambient air movement element located between the ambient hazardous air inlet and ambient hazardous air outlet, the ambient air movement element being located such that, during operation of the heat transfer unit, the ambient air movement element will move and cause ambient hazardous air to pass into the ambient hazardous air inlet, past coils of the condenser, and out the ambient hazardous air outlet;wherein the evaporator and condenser are coupled to each other via piping so as to collectively comprise a cooling circuit for passage of a cooling medium therebetween;wherein the motor is coupled to the ambient air movement element so as to cause the air movement element to move during operation of the heat transfer unit;wherein the first compartment is sealed off from the second compartment such that, during operation of the heat transfer unit, the first compartment will be sealed off from the ambient hazardous air; andwherein, the heat transfer unit is configured such that, during operation, an interior of the first compartment is maintained at an internal pressure that is higher than an interior pressure in the second compartment. 2. The heat transfer unit of claim 1, further comprising: a volume of ambient hazardous air in the second compartment. 3. The heat transfer unit of claim 1, further comprising: a pressurization system coupled to the first compartment and configured to maintain the interior atmosphere of the first compartment at the internal pressure that is higher than the interior pressure in the second compartment. 4. The heat transfer unit of claim 3, further including an inlet positioned to direct one of nitrogen, an inert gas, or air, towards the motor coupled to the ambient air movement element. 5. The heat transfer unit of claim 3, further comprising a seal between first compartment and the second compartment, the seal being configured to operate in conjunction with the pressurization system to minimize infiltration of some of the hazardous ambient air from the second compartment into the first compartment. 6. The heat transfer unit of claim 1, further comprising: an inert gas within the first compartment. 7. The heat transfer unit of claim 1, wherein the ambient air movement element comprises: blades of at least one of a centrifugal fan, an axial fan or a propeller fan. 8. The heat transfer unit of claim 7, wherein the ambient air movement element is made of a material comprising at least one of: aluminum or a polymer. 9. The heat transfer unit of claim 1, wherein the motor is coupled to the air movement element by a shaft passing through a shaft seal between the first compartment and the second compartment. 10. The heat transfer unit of claim 1, wherein the motor and the ambient air movement element are both part of a blower unit. 11. A heat transfer unit for use in a location where heat will be transferred by the unit from a heat source to ambient hazardous air, the heat transfer unit comprising: a cooling circuit comprising an evaporator, a condenser, a coolant and passages to contain the coolant and allow the coolant to circulate between the evaporator and condenser;an evaporator compartment including therein the evaporator and ignition source elements of the heat transfer unit; anda condenser compartment including the condenser therein and configured to, during operation of the heat transfer unit, transfer heat removed from a heat source by the evaporator to the ambient hazardous air by passing the ambient hazardous air through the condenser compartment,the evaporator compartment being sealed off from the condenser compartment such that, during operation of the heat transfer unit, an internal pressure in the evaporator compartment will be higher than an internal pressure in the condenser compartment so as to minimize infiltration of the ambient hazardous air into the evaporator compartment and to the ignition source elements of the heat transfer unit. 12. The heat transfer unit of claim 11, wherein the ignition source elements comprise one or more of: a motor, a relay, a switch, a compressor, or an electrical control element. 13. The heat transfer unit of claim 11, further comprising: a purge and pressurization system coupled to the evaporator compartment. 14. The heat transfer unit of claim 11, wherein the evaporator compartment and the condenser compartment are arranged in a side-by-side configuration. 15. The heat transfer unit of claim 11, wherein at least one of the ignition source elements is not any of: an explosion proof component, an encapsulated component, a non-incendive component, or an intrinsically safe component.
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이 특허에 인용된 특허 (19)
Chae Yong B. (Seoul KRX) Park Jong E. (Suweon-City KRX), Air conditioner.
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