A chiller for supplying chilled fluid for cooling a room includes two distinct power inputs. A critical power input is configured to supply power to a controller and to a pump in a chilled-fluid loop that circulates a cool working fluid through an air handler 34 to cool the air in the air handler. A
A chiller for supplying chilled fluid for cooling a room includes two distinct power inputs. A critical power input is configured to supply power to a controller and to a pump in a chilled-fluid loop that circulates a cool working fluid through an air handler 34 to cool the air in the air handler. A non-critical power input is configured to supply power to a compressor and, possibly, other elements of a refrigeration loop that includes an evaporator, the compressor, and a condenser to provide refrigeration via an evaporation/condensation cycle. When power is lost to the non-critical power input, the critical power input can continue to independently power the circulation of the working fluid through the chilled-fluid loop to continue to provide a level of cooling in the air handler.
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What is claimed is: 1. A chiller for supplying chilled fluid for cooling a room, the chiller comprising: a chilled-fluid loop comprising a conduit and a pump mounted to circulate working fluid through the conduit; an evaporation/condensation refrigeration loop comprising a conduit, an evaporator, a
What is claimed is: 1. A chiller for supplying chilled fluid for cooling a room, the chiller comprising: a chilled-fluid loop comprising a conduit and a pump mounted to circulate working fluid through the conduit; an evaporation/condensation refrigeration loop comprising a conduit, an evaporator, a compressor, and a condenser, wherein the refrigeration loop is in thermal communication with the chilled-fluid loop at the evaporator; a controller configured to control at least the pump of the chilled-fluid loop; a critical power input configured to supply power to the controller and to the pump; and a non-critical power input distinct from the critical-power input and configured to supply power to the compressor. 2. The chiller of claim 1, wherein an exposed section of the chilled-fluid loop is in thermal communication with air from the room to be cooled. 3. The chiller of claim 2, wherein the exposed section of the chilled-fluid loop passes through an air passage extending from the room, and a fan is provided in the air passage for drawing air from the room, through the passage, and across the exposed section of the chilled-fluid loop. 4. The chiller of claim 1, wherein the condenser includes a fan positioned to pass air across a section of the refrigeration loop to extract heat from a refrigerant fluid in the refrigeration loop and thereby condense the refrigerant fluid in the refrigeration loop, and wherein the fan is configured to be powered solely by the non-critical-power input. 5. The chiller of claim 1, wherein the evaporator is configured to extract heat from the working fluid in the chilled-fluid loop to evaporate the refrigerant fluid in the refrigeration loop. 6. The chiller of claim 1, wherein an uninterruptible power source is coupled with the critical power input for supplying power to the pump and to the controller. 7. The chiller of claim 1, wherein the chilled-fluid loop contains water. 8. A method for operating a chiller, the method comprising: coupling a non-critical power source with a compressor in a refrigeration loop configured for circulating refrigerant fluid through an evaporation/condensation cooling cycle; and coupling a critical power source with a controller and with a pump in a chilled-fluid loop that is in thermal communication with the refrigeration loop and with air from a room, the chilled-fluid loop being configured for circulating working fluid therethrough. 9. The method of claim 8, further comprising: powering the compressor with the non-critical power source; powering the controller and pump with the critical power source; and upon disruption of the power supply from the non-critical power source, continuing to power the controller and the pump with the critical power source to continue to circulate working fluid in the chilled-fluid loop absent operation of the compressor in the refrigeration loop. 10. The method of claim 8, wherein the working fluid in the chilled-fluid loop comprises water. 11. The method of claim 8, further comprising circulating air from a room across an exposed section of the chilled-fluid loop to transfer heat from the air to the working fluid in the chilled-fluid loop. 12. The method of claim 8, further comprising coupling the non-critical power source with a fan configured to cool refrigerant fluid in a condenser in the refrigeration loop. 13. The method of claim 8, wherein the compression of the refrigerant fluid in the refrigeration loop is powered solely by the non-critical power source. 14. The method of claim 8, wherein the pumping of the working fluid in the chilled-fluid loop is powered solely by the critical power source. 15. The method of claim 8, wherein the critical power source is an uninterruptible power source. 16. The method of claim 15, wherein the uninterruptible power source stores chemical energy. 17. A method for operating a chiller through a disruption in a power supply, the method comprising: circulating working fluid in a chilled-fluid loop and passing air from a room across an exposed section of the chilled-fluid loop to cool the air; circulating refrigerant fluid in a refrigeration loop for cooling the working fluid in the chilled-fluid loop, the refrigerant fluid in the refrigeration loop being evaporated by an evaporator, compressed by a compressor and condensed by a condenser in a refrigeration cycle; and upon the disruption of the power supply, allowing the compression of the refrigerant fluid in the refrigeration loop to be halted, while continuing to pump working fluid through the chilled-fluid loop and while continuing to pass air from the room across the exposed section of the chilled-fluid loop, wherein the circulation of working fluid in the chilled-fluid loop is powered by a power source distinct from the power source that powers the compressor. 18. The method of claim 17, wherein the circulation of working fluid in the chilled-fluid loop is powered by an uninterruptible power source. 19. The method of claim 17, wherein water is circulated in the chilled-fluid loop.
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