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1. (WO2018044902) SYSTEMS AND METHODS FOR EVAPORATIVE HEAT REJECTION EQUIPMENT FAN SPEED CONTROL

Pub. No.:    WO/2018/044902    International Application No.:    PCT/US2017/049136
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed Aug 30 01:59:59 CEST 2017
IPC: F25B 49/02
Applicants: JOHNSON CONTROLS TECHNOLOGY COMPANY
Inventors: CARTER, Thomas P.
LIU, Zan
Title: SYSTEMS AND METHODS FOR EVAPORATIVE HEAT REJECTION EQUIPMENT FAN SPEED CONTROL
Abstract:
A thermal management system includes a heat rejection device configured to fluidly couple to a refrigeration system, a fan configured to provide an entering airflow across the heat rejection device to cool a flow of water within the heat rejection device, and a controller configured to control a speed of the fan based on at least two of (i) a relative humidity of the entering airflow, (ii) a percentage of capacity one or more components of the refrigeration system are operating at, (iii) a ratio of water to energy costs, and (iv) a ratio of a design power of a compressor of the refrigeration system to a design power of the fan to minimize a total utility operation cost of the thermal management system including (i) energy costs to operate the fan and the refrigeration system and (ii) water costs of the flow of water.