Chilling unit for evaporative air conditioning units
A chilling system for reducing the temperature of water used in an evaporative air conditioning unit (EAC) to increase its efficiency and efficacy. The chilling system is integrated within a frame for convenient and secure retrofit to the EAC. Water is pumped into the chilling system via a water supply line from the EAC. When the temperature of the water in the water supply line is above a preset high temperature, the power supply turns on the thermoelectric chilling device to remove heat from coolant, which coolant passes through the heat exchanger to remove heat from the water passing through the heat exchanger. The water, now cooled, is discharged back into the reservoir of the EAC. This cycle continues until the temperature sensor indicates that the temperature of the water has fallen below a preset low temperature, at which point the power supply turns off the thermoelectric chilling device.
1. A method of retrofitting an evaporative air conditioning unit with a chilling unit, the method comprising:
providing a chilling unit comprising:
a frame, the frame comprising a bottom side and a top side opposite the bottom side; and
a power supply;
supplying water, via a water supply line, from the evaporative air conditioning unit;
fluidly connecting a water block with the water supply line;
placing a thermoelectric cooling device in heat exchange connection with the water block;
electrically connecting the thermoelectric cooling device with the power supply;
containing the power supply, water block and thermoelectric cooling device at least partially within the frame;
fluidly connecting a water pump in the evaporative air conditioning unit to the water supply line, through an interface on the bottom side of the frame;
cooling, with the thermoelectric cooling device, water in the water block;
directing a water output from the water block through an interface on the bottom side of the frame and toward the evaporative air conditioning unit;
connecting the power supply via a cable to a power source on the evaporative air conditioning unit, through an interface on the bottom side of the frame; and
disposing the frame on the evaporative air conditioning unit such that the bottom side of the frame faces or contacts a surface of the evaporative air conditioning unit.
2. The method of claim 1 , wherein the frame comprises:
the interface on its bottom side of a size to receive the water supply line and/or the cable;
an air vent on a side thereof; and
wherein the chiller is a thermoelectric cooling device employing the Peltier effect.
3. The method of claim 1 , further comprising:
detecting, with a first temperature sensor, the temperature of supply water within the water supply line; and
turning on power to the thermoelectric cooling device when the temperature of the supply water is above a first preset temperature, and turning off the power to the thermoelectric cooling device when the temperature of the supply water is below a second preset temperature.
4. The method of claim 3 , further comprising:
detecting, with a second temperature sensor, the temperature of water in a water output line for passing water from the chilling unit to the evaporative air conditioning unit; and
disposing externally of the frame an ambient air temperature and/or humidity sensor.
5. The method of claim 1 wherein:
placing a thermoelectric cooling device comprises placing a series of thermoelectric cooling devices; and
fluidly connecting a water block comprises fluidly connecting a series of water blocks.
6. The method of claim 1 , further comprising:
providing the thermoelectric cooling device with a heat sink;
directing a fan at the heat sink; and
disposing a vent within the frame where the fan is located.
7. The method of claim 6 , further comprising:
placing the thermoelectric cooling device in heat exchange connection with the heat sink; and
allowing water to flow back and forth through a plurality of internal channels in the water block.
8. A method of retrofitting an evaporative air conditioning unit with a chilling unit, the method comprising:
providing a chilling unit comprising a frame;
disposing the frame upon the evaporative air conditioning unit;
supplying water, via a water supply line, from the evaporative air conditioning unit to a water block within the frame;
placing within the frame a thermoelectric cooling device in heat exchange connection with the water block;
electrically powering the thermoelectric cooling device;
fluidly connecting the water supply line to a water pump in the evaporative air conditioning unit;
cooling, with the thermoelectric cooling device, water in the water block; and
discharging, via an output water line, a water output from the water block toward the evaporative air conditioning unit.
9. The method of claim 8 further comprising:
sensing a temperature of water in the water supply line;
sensing a temperature of water in the output water line; and
increasing or decreasing electrical power to the thermoelectric cooling device based on a difference in temperature between the temperature of the water in the water supply line and the temperature of the water in the output water line.
10. The method of claim 8 further comprising employing the Peltier effect in the thermoelectric cooling device.
11. The method of claim 8 , further comprising:
detecting, with a first temperature sensor, the temperature of supply water within the water supply line; and
turning on power to the thermoelectric cooling device when the temperature of the supply water is above a first preset temperature, and turning off the power to the thermoelectric cooling device when the temperature of the supply water is below a second preset temperature.
12. The method of claim 8 , further comprising:
providing the thermoelectric cooling device with a heat sink; and
directing a fan at the heat sink.
13. The method of claim 12 , further comprising:
detecting, with a second temperature sensor, the temperature of water in the water output line;
sensing, with an ambient sensor disposed externally of the frame, ambient air temperature; and
when the ambient air temperature reaches a preset air temperature, or when the temperature of supply water within the water supply line exceeds a third preset temperature:
turning on the water pump in the evaporative air conditioning unit; and
monitoring with a meter a water flow rate in the water supply line.
14. The method of claim 13 , further comprising, after turning on the water pump in the evaporative air conditioning unit and when the water flow rate in the water supply line exceeds a preset flow value, turning on the fan at the heat sink.
15. The method of claim 14 , further comprising running the fan until the ambient air temperature falls below the preset air temperature or the temperature of supply water within the water supply line falls below the third preset temperature.