JPH0979036A - Cooling operation method and cooling equipment in marine vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a device itself by selectively operating a plurality of driven sea water pumps on the primary side cooling water system according to the temperature of fresh water in a secondary side cooling water system. SOLUTION: In central fresh water cooling equipment for air-conditioning a cabin in a marine vessel and cooling cooling equipment 21... for an engine cooling part and the like, a primary side cooling system 1 is so constituted that a sea water feed pipeline 12 leading to sea water is connected to a cooler 11 for cooling fresh water on the secondary side cooling water system 2 side and that sea water pumps 13... different in discharge displacement are interposed in parallel at the intermediate part of the sea water feed pipeline 12. At the time of cooling operation, the combination of the driven sea water pumps 13 is selected according to the temperature value of fresh water detected by a temperature detector 24. In the case of the detected temperature being high, for instance, a plurality of sea water pumps 13 are driven simultaneously, and in the case of the detected temperature becoming low, the combination with the low total discharge displacement of the driven sea water pumps 13 is selected according to the temperature value.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cooling operation method and cooling equipment for a ship.

[0002]

2. Description of the Related Art Usually, in a central fresh water cooling system for a ship, a primary cooling seawater pump and a cooler (cooler) have a maximum cooling heat load considered to be a load side and a maximum primary side seawater temperature (usually 32 The design is being carried out at.

At this time, the design temperature of the secondary side fresh water is also designed at a higher temperature (usually the primary side seawater temperature plus 4 to 5 ° C.) in accordance with the design temperature of the primary side seawater, and this temperature is always maintained. The automatic temperature control is performed by adjusting the flow rate of the secondary side fresh water introduced into the cooler so as to maintain the temperature.

[0004] In such a facility, the operation is usually in a partial load state, and in some cases, the operation is performed with an excessive margin. In such a state, the primary side is operated. The seawater pump is operating with energy loss.

In order to eliminate such waste, conventionally, a variable speed pump is used as the primary side seawater pump, and its speed is controlled so that the fresh water temperature in the secondary side fresh water supply pipe is kept constant. Was controlled. As another method, the primary fresh water based on the calculated value of the control circuit pre-programmed with the flow rate of the fresh fresh water introduced into the cooler as a parameter while the secondary fresh water is automatically adjusted to a constant design temperature. The group of cooling seawater pumps was controlled.

[0006]

By the way, since the variable speed pump or the numerical operation circuit is used for the seawater pump on the primary side as in the prior art, the variable speed device or the control circuit unit becomes very expensive. There was a drawback that

[0007] Therefore, an object of the present invention is to provide a cooling operation method and a cooling facility in a ship that can solve the above problems.

[0008]

In order to solve the above problems, a cooling operation method for a ship according to the present invention includes a plurality of seawater pumps for supplying seawater as primary side cooling water to a cooler arranged inside the ship. The operating method is selectively driven based on the temperature of fresh water in a fresh water supply pipe that is arranged between the cooler and each cooling device and supplies fresh water as secondary side cooling water.

Further, the cooling equipment in the ship of the present invention is
A plurality of seawater pumps are installed in parallel with each other in the middle of the seawater supply pipe for supplying seawater as the primary side cooling water to the cooler arranged in the ship, and between the cooler and each cooling device in the ship. Is equipped with a temperature detector that detects the temperature of the fresh water in the fresh water supply pipe that uses fresh water as the secondary side cooling water, and inputs the temperature value detected by this temperature detector. A control device for selectively driving the seawater pump to be used is provided.

Further, in the above cooling equipment, the temperature when the fresh water temperature rises when the sea water pump is selectively driven and the temperature when the fresh water temperature drops when the drive of the selectively driven sea water pump is lowered are predetermined. The temperature difference is set.

According to the above cooling operation method and cooling equipment, the seawater pump to be driven on the primary side cooling water system side is selected according to the temperature of the fresh water in the secondary side cooling water system. The configuration of the device is simplified as compared with the case of using the seawater pump of.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cooling facility according to an embodiment of the present invention will be described below with reference to FIG. This cooling facility is roughly divided into a primary side cooling water system 1 using seawater (primary cooling water) as a driving heat source and a secondary side cooling water system 2 using fresh water (secondary cooling water) as a heat medium. Has been done.

The primary side cooling water system 1 includes a cooler 11 for cooling fresh water on the secondary side cooling water system 2 side.
A seawater supply pipe 12 for guiding seawater as a driving heat source to the cooler 11, and a plurality of seawater pumps 13, for example, three seawater pumps, which are interposed in parallel in the middle of the seawater supply pipe 12 and have different discharge capacities, respectively. It consists of

The secondary side cooling water system 2 includes a plurality of cooling devices (for example, cooling of a cabin and a cooling unit of an engine) 21 arranged at predetermined positions in a ship, and each cooling device. A fresh water supply pipe 22 provided between a heat exchange part (not shown) in 21 and the heat exchange part 11a of the cooler 11, and a fresh water pump interposed in the fresh water supply pipe 22. 23 and a temperature detector 24 for detecting the temperature of the fresh water discharged from the cooler 11.

Further, a temperature value detected by a temperature detector 24 provided in the middle of the fresh water supply pipe 22 is input to the cooling equipment, and the operation control of the seawater pumps 13 is performed according to the temperature value. A control device 31 for performing the above is provided.

In the control device 31, the temperature value of fresh water is divided into a plurality of stages, and the combination of the seawater pump 13 to be used is determined according to each of these temperature stages.

Incidentally, with respect to the maximum expected cooling load,
At the highest seawater temperature (for example, 32 ° C.), the rule always requires a backup pump. Therefore, when the seawater pump 13 is driven in a combination that leaves the backup pump and obtains the maximum flow rate, the temperature of the fresh water is It is considered that it can be cooled to a predetermined design temperature (for example, 36 ° C.).

In the above structure, when the cooling operation is performed, the combination of the seawater pumps 13 to be driven is selected according to the temperature value of the fresh water detected by the temperature detector 24. For example, when the detected temperature is high, a plurality of seawater pumps 13 are simultaneously driven, and when the detected temperature is low, the total of the seawater pumps 13 to be driven is calculated according to the temperature value. The controller 31 selects a combination having a low discharge capacity.

Of course, as described above, the combination data of the seawater pump 13 selected according to the temperature stage is
It is input to the control device 31 in advance. Then, a predetermined temperature difference is provided between the temperature when the fresh water temperature rises when selectively driving the seawater pump 13 and the temperature when the fresh water temperature falls when the selectively driven seawater pump is released. There is.

That is, at the time of switching the operation of the seawater pump 13 according to the temperature range of the freshwater (at the time of the operation transition), the seawater pump 13 changes depending on whether the freshwater temperature changes to the high temperature side or the low temperature side. A predetermined temperature difference is provided in the switching set temperature (step shift set temperature). By providing the temperature difference in this way, it is possible to prevent the hunting operation caused by the temperature rise and fall near the switching set temperature of the seawater pump 13. In addition, the above-mentioned switching set temperature is made variable, whereby the adaptability of the entire system to changes over time and the like is enhanced.

Further, during the above cooling operation, all the seawater pumps 13 or a predetermined number of seawater pumps 13 are driven at a proper interval for a predetermined time to clean the primary side cooling water system.

As described above, the seawater pump 13 to be driven on the primary side cooling water system side is selected according to the temperature of the fresh water in the secondary side cooling water system. The cost of the device itself can be reduced as compared with the case of using a seawater pump.

In the above embodiment, the temperature control valve is not provided in the fresh water supply pipe 22, but in order to prevent overcooling on the cooling device 21 side as shown in FIG. A secondary side bypass pipe 41 that bypasses the cooler 11 is provided, and a temperature control valve 42 for stopping the supply of fresh water is provided at the connection part of the cooler 11 side with the pipe 22a from the heat exchange part 11a. You may do it. The temperature control valve 42 does not have to be so precise.

As described above, the temperature control valve 42 is provided to prevent the engine of a ship from being overcooled.
For example, when the temperature becomes 25 ° C. or lower, the cooler 11 does not cool the fresh water.

Further, as shown by the broken line in FIG. 2, in order to prevent overcooling in a predetermined cooling device 21, the flow control valve 43 for temperature control is provided in the branch pipe 22b having the cooling device 21A. Should be installed.

[0026]

As described above, according to the cooling operation method and the cooling equipment of the present invention, the seawater pump to be driven on the primary side cooling water system side is selected according to the temperature of the fresh water in the secondary side cooling water system. Therefore, the cost of the apparatus itself can be reduced as compared with the case where a variable speed seawater pump is used or a complicated program control circuit is used as in the conventional case.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a cooling facility according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a modified example of the cooling facility.

[Explanation of symbols]

 1 Primary side cooling water system 2 Secondary side cooling water system 11 Cooler 12 Seawater supply pipe 13 Seawater pump 21 Cooling device 22 Fresh water supply pipe 23 Fresh water pump 24 Temperature detector 31 Controller 41 Bypass pipe 42, 43 Temperature control valve

Claims (3)

[Claims] 1. A plurality of seawater pumps for supplying seawater as primary-side cooling water to a cooler arranged in a ship are arranged between the cooler and each cooling device to be fresh water as secondary-side cooling water. A method of cooling operation in a ship, which is selectively driven based on a temperature of fresh water in a fresh water supply pipe for supplying the water. 2. A plurality of seawater pumps are installed in parallel with each other in the middle of the seawater supply pipe for supplying seawater as primary side cooling water to a cooler arranged in the ship, and each of the cooler and the inside of the ship. A temperature detector that detects the temperature of fresh water in the fresh water supply pipe that is placed between the cooling equipment and uses fresh water as the secondary side cooling water is provided, and the temperature value detected by this temperature detector is input. At the same time, a cooling device for a ship is provided with a control device for selectively driving a seawater pump to be used according to the temperature value. 3. A temperature when the fresh water temperature rises when the seawater pump is selectively driven and a temperature when the fresh water temperature drops when the drive of the selectively driven seawater pump is lowered.
The cooling facility for a ship according to claim 2, wherein a predetermined temperature difference is provided.