| US 7,581,515 B2 | ||
| Control scheme for an evaporator operating at conditions approaching thermodynamic limits | ||
| Edward W. O'Connor, East Hampton, Conn. (US) | ||
| Assigned to Hamilton Sundstrand Corporation, Windsor Locks, Conn. (US) | ||
| Filed on Jun. 29, 2007, as Appl. No. 11/770,785. | ||
| Prior Publication US 2009/0000772 A1, Jan. 01, 2009 | ||
| Int. Cl. F28D 15/02 (2006.01); F28D 15/06 (2006.01) | ||
| U.S. Cl. 122—31.1 [165/104.19; 165/104.11] | 17 Claims |
| 11. An evaporative heat exchanger assembly comprising:
a plurality of evaporative heat exchanger cores each including an evaporant inlet, an evaporant exhaust, and an inlet for
receiving a heat transfer medium, wherein subsequent ones of the evaporative heat exchangers receive heat transfer medium
from a preceding one of the plurality of evaporative heat exchangers such that the heat transfer medium flows through each
of the plurality of heat exchangers in series;
an evaporant control valve associated with each of the plurality of heat exchangers for controlling evaporant flow;
a variable control valve for controlling evaporant flow to each of the evaporant control valves;
an inlet temperature sensor disposed at the inlet for receiving the heat transfer medium; and
a controller for actuating the evaporant control valves and the variable control valve responsive to a temperature of the
heat transfer medium measured by the inlet temperature sensor to maintain a desired pressure at the evaporant exhaust of each
of the plurality of evaporative heat exchanger to prevent freezing of the evaporant flow within each of the plurality of evaporative
heat exchangers.
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