US Patent No. 9,883,617

AIR-CONDITIONING CONTROL APPARATUS FOR DATA CENTER


Patent No. 9,883,617
Issue Date January 30, 2018
Title Air-conditioning Control Apparatus For Data Center
Inventorship Hayato Shimizu, Tokyo (JP)
Assignee HITACHI, LTD., Tokyo (JP)

Claim of US Patent No. 9,883,617

1. An air-conditioning control apparatus having a memory, a processor, and a storage device coupled thereto, the air-conditioning
control apparatus being configured to:
calculate a variation ?Tin(i), where i=1 to N, in air temperature at an inlet port of an ith information-processing unit, where N is a total number
of information processing units, based on position of the ith unit and an air flow rate through the ith unit, wherein the
air flow rate through the ith unit is measured by a fan speed sensor operatively connected with the processor, and wherein
the air flow rate through the ith unit is measured by a fan speed sensor operatively connected with the processor, and wherein
the air temperature at the inlet port of the ith information-processing unit is measured by a first sensor operatively connected
with the processor, wherein the first sensor is at least one of a first temperature sensor or a first infrared camera;

calculate a first temperature sensitivity a(l, j) by dividing the variation by a variation Tout(j), where j=1 to N, in air temperature at an outlet port of a jth unit, wherein the air temperature at the outlet port of
the jth unit is measured by at least one of a second temperature sensor operatively connected with the processor or a second
infrared camera operatively connected with the processor;

calculate a first temperature sensitivity a(i, j) by dividing the variation ?Tin(i) by a variation Tout(j), where j=1 to N, in air temperature at an outlet port of a jth unit, based on the position of the jth unit and an air
flow rate through the jth unit, wherein the air flow rate through the jth unit is measured by a second fan speed sensor operatively
connected with the processor, wherein the air temperature at the outlet port of the jth unit is measured by a second sensor
operatively connected with the processor, wherein the second sensor is at least one of a second temperature sensor or a second
infrared camera;

calculate an air temperature ?Tin(i) at the inlet port of the ith unit based on an air temperature Tout (j) at an outlet port of the jth unit and the calculated first temperature sensitivity a(i, j);

determine a maximum value M of the temperature ?Tin(i); and

control a temperature setting of at least one air conditioner to prevent the maximum value M from exceeding a predetermined
threshold value.