Heat source system, and device and method for controlling cooling water supply device

Patent metadata

Field	Value
Publication number	US-10119717-B2
Application number	US-201314655645-A
Country	US
Kind code	B2
Filing date	Jul 12, 2013
Priority date	Jan 31, 2013
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

In order to achieve a reduction in energy consumption in a cooling water supply device without using a database, an equipment control device ( 70 a ) of a cooling water supply device: uses the load of a chiller, and a cooling water outlet temperature lower limit setpoint determined in accordance with the set temperature for the cooling water outlet of the chiller, to set a cooling water inlet temperature lower limit setpoint; sets, as the cooling water inlet temperature setpoint, the higher of the lower limit setpoint and the cooling water inlet temperature lower limit value as determined from the outside wet-bulb temperature; and generates a control command for a cooling tower fan and a control command for the cooling water flow volume, so as to match the cooling water inlet temperature and the cooling water outlet temperature respectively with the cooling water inlet temperature setpoint and the cooling water outlet temperature lower limit setpoint which have been set.

First claim

The invention claimed is:

1. A device for controlling a cooling water supply device which includes a cooling tower and supplies cooling water to a condenser of a chiller, comprising:
an equipment controller configured to:
acquire a cooling water outlet temperature lower limit setpoint which is determined in accordance with a set temperature for a chilled water outlet in the chiller, from the chiller;
determine a cooling water inlet temperature lower limit setpoint using the cooling water outlet temperature lower limit setpoint and the load of the chiller;
compare a cooling water inlet temperature lower limit value determined from an outside wet-bulb temperature and the cooling water inlet temperature lower limit setpoint, and for setting the higher one as a cooling water inlet temperature setpoint; and
generate a control command for a cooling tower fan and a control command for a cooling water flow rate, so as to match a cooling water inlet temperature and a cooling water outlet temperature respectively with the cooling water inlet temperature setpoint and the cooling water outlet temperature lower limit setpoint.

2. The device for controlling a cooling water supply device according to claim 1 ,
wherein the equipment controller is further configured to subtract a temperature difference between a cooling water inlet and outlet from the cooling water outlet temperature lower limit setpoint to calculate the cooling water inlet temperature lower limit setpoint, and
wherein the temperature difference between cooling water inlet and outlet is determined in accordance with the cooling water flow rate and the load of the chiller.

3. A heat source system, comprising:
a chiller which includes a compressor, a condenser, an expansion valve, and an evaporator;
a cooling water supply device which includes a cooling tower, and supplies cooling water to the condenser of the chiller; and
the device for controlling a cooling water supply device according to claim 1 .

4. A method for controlling a cooling water supply device which includes a cooling tower and supplies cooling water to a condenser of a chiller, comprising:
acquiring a cooling water outlet temperature lower limit setpoint which is determined in accordance with a set temperature for a chilled water outlet in the chiller, from the chiller;
determining a cooling water inlet temperature lower limit setpoint using the cooling water outlet temperature lower limit setpoint and the load of the chiller;
comparing a cooling water inlet temperature lower limit value determined from an outside wet-bulb temperature and the cooling water inlet temperature lower limit setpoint, and for setting the higher one as a cooling water inlet temperature setpoint; and
generating a control command for a cooling tower fan and a control command for a cooling water flow rate, so as to match a cooling water inlet temperature and a cooling water outlet temperature respectively with the cooling water inlet temperature setpoint and the cooling water outlet temperature lower limit setpoint.

5. A heat source system, comprising:
a chiller which includes a compressor, a condenser, an expansion valve, and an evaporator;
a cooling water supply device which includes a cooling tower, and supplies cooling water to the condenser of the chiller; and
the device for controlling a cooling water supply device according to claim 2 .

Assignees

• Mitsubishi Heavy Ind Thermal Systems Ltd

Inventors

• Matsuo Minoru
• Nikaido Satoshi
• Tateishi Koki
• Ouchi Toshiaki

Classifications

• F25B2600/111

  of condenser fans · CPC title

• F24F5/0003 Primary

  Exclusively-fluid systems · CPC title

• F28F27/00 Primary

  Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus (control arrangements in general G05) · CPC title

• F25B2700/21161

  of the fluid heated by the condenser · CPC title

• F25B2700/21171

  of the fluid cooled by the evaporator · CPC title