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Heating/defrost constructions of a very low temperature refrigeration system having a defrost supply circuit and a defrost return bypass circuit optimizing the heating/defrost cycle, preventing overload (excessive pressure) of its refrigeration process and protecting components from damaging tempera

Heating/defrost constructions of a very low temperature refrigeration system having a defrost supply circuit and a defrost return bypass circuit optimizing the heating/defrost cycle, preventing overload (excessive pressure) of its refrigeration process and protecting components from damaging temperatures. The defrost cycle operates continuously, when required, and provides a shorter recovery period between heating/defrost and cooling operating modes. The rate of the temperature change during cool down or warm up is controlled in an open loop fashion by controlled refrigerant flow in bypass circuits.

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Heating/defrost constructions of a very low temperature refrigeration system having a defrost supply circuit and a defrost return bypass circuit optimizing the heating/defrost cycle, preventing overload (excessive pressure) of its refrigeration process and protecting components from damaging tempera

Heating/defrost constructions of a very low temperature refrigeration system having a defrost supply circuit and a defrost return bypass circuit optimizing the heating/defrost cycle, preventing overload (excessive pressure) of its refrigeration process and protecting components from damaging temperatures. The defrost cycle operates continuously, when required, and provides a shorter recovery period between heating/defrost and cooling operating modes. The rate of the temperature change during cool down or warm up is controlled in an open loop fashion by controlled refrigerant flow in bypass circuits. tion data information about the dual evaporative pre-cooling system. 7. An evaporative condenser air pre-cooling device for a rooftop unit having a condenser, comprising: a housing; an evaporative media disposed in the housing with an air entry side through which an incoming air flows; a water distribution device supported by the housing and disposed above the evaporative media through which a water source is distributed; means for controlling distribution of the water source; a controller, and a screen located on the air entry side of the evaporative media, wherein removal of the screen and removal of the evaporative media is permitted from the air entry side without moving the water distribution device or the housing. 8. The evaporative condenser air pre-cooling device according to claim 7, wherein the controller receives signals from at least one sensor to monitor system operations and to report an operating performance. 9. The evaporative condenser air pre-cooling device according to claim 8, wherein the at least one sensor comprises: a first temperature sensor that detects an outdoor air; and a second temperature sensor located between the evaporative media and the condenser that determines a temperature decrease in the evaporative condenser air pre-cooling device. 10. The evaporative condenser air pre-cooling device according to claim 7, wherein the water distribution device includes a tube with perforations directed upward. 11. The evaporative condenser air pre-cooling device according to claim 7, wherein the evaporative media is supported on a lower portion of the housing by a horizontal flange bent inward from the housing, and wherein the horizontal flange is connected to the housing by an edge sloping downward from the housing to the horizontal flange such that the edge catches water droplets from a downstream side of the evaporative media. 12. A method for reducing the energy consumption of a rooftop air conditioning unit having a blower that supplies conditioned air, comprising: adding an evaporative condenser pre-cooling device that increases the cooling capacity of the unit; and reducing the speed of the blower and thereby reducing the energy quantity used to drive the blower during operating hours. 13. The method according to claim 12, wherein the evaporative pre-cooling device reduces the temperature of the air discharged from the rooftop air conditioning unit. 14. The method according to claim 13, wherein the rooftop air conditioning unit further includes: evaporatively cooling the air when a compressor is not being operated by controlling a pump and at least one condenser fan in the rooftop air conditioning unit. 15. A method for reducing the energy consumption in a rooftop air conditioning unit including a condenser, an evaporator, a compressor and a blower, the method comprising: providing an evaporative condenser air pre-cooling device; providing a ventilation air pre-cooling coil; connecting the evaporative condenser air pre-cooling device to the ventilation air pre-cooling coil; circulating a cooling fluid through the evaporative condenser air pre-cooling device and the ventilation air pre-cooling coil. 16. The method according to claim 15, wherein the cooling fluid is circulated in response to an instruction by a controller to operate a pump based on at least one operating parameter detected by at least one sensor. 17. The method according to claim 15, wherein the rooftop air conditioning unit further includes the step of: evaporatively cooling the air when the compressor is not being operated by controlling a pump and at least one condenser fan in the rooftop air conditioning unit. combinations thereof.