JPS61268966A - Method of controlling refrigeration capacity of absorption refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for controlling the refrigeration capacity of an absorption refrigerator.

[Conventional technology]

In an absorption refrigerator that has a generator equipped with a group of heat transfer tubes that conduct the heat source fluid, foreign matter contained in the heat source fluid can cause dirt to adhere to the inner walls of the heat transfer tubes, reducing the heat transfer performance. many.

In particular, when hot spring wastewater, waste hot water discharged from iron and other factories, hotels, baths, kitchens, etc. is used as a heat source fluid, it is possible to prevent heat transfer performance from deteriorating due to dirt on the inner walls of heat transfer tubes. Therefore, both ends of the heat transfer tube are located inside the water chamber, and water can pass through the brush.
A storage section is provided to hold a cleaning body such as a sponge ball, and the flow of the conducting heat source fluid is switched between the forward and reverse directions periodically or at any time to move the cleaning body back and forth within the heat transfer tube, or the sponge ball is constantly moved. A device equipped with an automatic tube cleaning device that circulates the flow and scrubs the inner wall of the heat transfer tube is used.

In such devices, when it is necessary to control the refrigeration capacity of the absorption chiller, the flow rate of the heat source fluid conducted through the heat transfer tubes in the generator is usually adjusted, and the refrigerant generated in the generator is adjusted. This is done by adjusting the amount of steam.

[Problem that the invention seeks to solve]

However, in the conventional method of adjusting the flow rate of the heat source fluid to control the refrigeration capacity of an absorption chiller, when the load is small, the heat source fluid has a small flow rate that is so small that it cannot move the cleaning body. When the flow rate is adjusted, it becomes impossible to clean the inner walls of the heat transfer tubes, and especially when waste hot water is used, dirt on the inner walls of the heat transfer tubes increases rapidly, resulting in a decrease in heat transfer performance. , which led to the problem of lowering the heat recovery rate.

The present invention solves these problems and provides a method that can control the refrigeration capacity of an absorption refrigerator without interfering with cleaning the inner wall of the heat transfer tube of the generator or reducing heat transfer performance. That is.

[Means for solving problems]

What is the present invention? )! , an absorption refrigerator having a generator equipped with a group of heat transfer tubes that conduct a tA fluid, and an automatic tube cleaning device that scrubs the inner wall by moving a cleaning body inside these heat transfer tubes by the flow of the heat source fluid, A tube opening/closing mechanism is provided that selectively opens and closes a flow path leading to the heat transfer tube to adjust the effective total cross-sectional area of the heat transfer tube, and controls the refrigeration capacity by adjusting the flow rate of the heat source fluid according to the load. At the same time, in accordance with the adjusted flow rate, adjust the tube opening/closing mechanism so that the total effective cross-sectional area of the heat transfer chain is such that the flow velocity within the heat transfer tube is maintained at a minimum flow velocity that can drive the cleaning body. This is a method for controlling the refrigeration capacity of an absorption refrigerator, which is characterized by the following.

〔Example〕

One embodiment of the present invention will be described with reference to the drawings.
is a generator in which a group of heat transfer tubes 2 are arranged to conduct a heat source fluid and an absorbing solution 3 is contained. This generator
The refrigerant vapor 4 generated is led to a condenser (not shown), etc., and the absorption solution 3 is led to an absorber (not shown) to absorb the refrigerant, and then is circulated and transferred to the generator 1 again. ing.

Furthermore, storage portions 6 are formed at both ends of each heat transfer tube 2 to allow water to pass therethrough and store the cleaning body 5, and each storage portion 6 is located in water chambers 7 and 8 provided on both sides. The inside of the water chamber 7 on the left side of the illustrated example is divided into two by a partition plate 9. The heat transfer tubes 2 in each partition section partitioned by a partition plate 9 are further divided by a partition plate 10 so that the heat source fluid is divided into certain unit groups.
．． to', and each unit group section has a conduit 12.12' with an on-off valve 11.11'.
are connected, and each conduit 12 of one partition is connected to a conduit 13,
Each conduit 12' of the other partition is connected to a conduit 14. The conduits 13 and 14 are connected to a four-way valve 15, and the four-way valve 15 is connected to a heat source fluid inlet pipe 16 and a discharge pipe 1.
7 are connected, and the heat source fluid flows in the forward and reverse directions within the heat transfer tube 2 by switching the four-way valve.

1B is a heat source fluid source, 19 is a pump, and 20 is a flow control valve.

In the illustrated example, all of the on-off valves 11 are opened, and the heat source fluid flows from the introduction pipe 16 through the four-way valve 15, through the conduit 13 as indicated by the solid arrow, passes through the heat transfer tube 2, and passes through the conduit 1.
4 and is discharged from a discharge pipe 17 via a four-way valve 15, and the cleaning body 5 is stored in a storage section 6 at the downstream end of each heat transfer tube 2. Now, when the four-way valve 15 is switched as shown by the dotted line, the heat source fluid flows in the opposite direction as shown by the dotted line arrow, and at this time, the cleaning body 5 pushed by the heat source fluid moves in the opposite direction while scrubbing the inner wall of the heat transfer tube 2. direction, and is stored in the storage section 6 at the opposite end.

Here, if the on-off valve 11 is left open and the on-off valve 11'' is closed, the effective total cross-sectional area of the heat transfer tube 2 through which the heat source fluid flows will be half of that when both the on-off valves 11 and 11' are open. That is, the opening/closing valves 11 and 11' act as a tube opening/closing mechanism that adjusts the effective total cross-sectional area of the heat transfer tube.

By appropriately selecting the number of on-off valves and appropriately selecting the number of heat transfer tubes belonging to each on-off valve, it is possible to obtain any effective total cross-sectional area of heat transfer tubes corresponding to the load or the flow rate of the heat source fluid described below. be able to.

By the way, when controlling the refrigeration capacity of the refrigerator, the flow rate of the heat source fluid is adjusted according to the load by adjusting the throttle of the flow control valve 20 (or the rotation speed of the pump 19). In response to this, the opening/closing valve 11 is set as appropriate to obtain a total effective cross-sectional area of the heat transfer tube that maintains the flow velocity in the heat transfer tube at a minimum flow velocity that can drive the cleaning body 5.
．． 11' is selectively opened and closed, for example, the flow rate and the effective total cross-sectional area are adjusted so as to vary proportionally.

At this time, since the flow rate of the heat source fluid used in the generator 1 is regulated, the amount of generated refrigerant vapor 4 is controlled and the refrigeration capacity is controlled, and at the same time, the heat source fluid in the heat transfer tube 2 is controlled. A predetermined flow rate that can drive the cleaning body 5 can be ensured.

That is, by adjusting the amount of heat source fluid flowing into the generator 1 to control the refrigeration capacity, and at the same time selectively opening and closing the flow path leading to the heat transfer tube 2 according to the load, the heat source fluid can be circulated. In the effective heat transfer tube, the flow rate of the heat source fluid is maintained at a sufficient amount for the cleaning body 5 to move.
Even during partial load, the inner wall of the heat transfer tube 2 is scrubbed, and the heat transfer performance of the heat transfer tube 2 is not degraded.

For the heat transfer tube that is closed at this time, open/close valves 11 and 11' are turned on at other appropriate times to pass the cleaning body through.
Make sure to scrub.

In the above embodiment, the on-off valve 11 and the conduit 12 are provided for each fixed unit group of heat transfer tubes 2, but these on-off valves and conduits may be provided for each heat transfer tube 2, respectively.

〔Effect of the invention〕

As described above, according to the present invention, in an absorption refrigerator, the inner wall of the heat transfer tube of the generator is not prevented from being scrubbed by the cleaning body using the flow of the heat source fluid, and the heat transfer performance is not deteriorated. The refrigeration capacity can be easily controlled, and is particularly effective when using various types of dirty waste water as the heat source fluid.

[Brief explanation of drawings]

The drawing is a system explanatory diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Generator, 2... Heat transfer tube, 3... Absorption solution, 4... Refrigerant vapor, 5... Cleaning body, 6... Storage part, 7.8... Ice chamber , 9... Partition plate, 10.10
'...Partition plate, 11°11'...Opening/closing valve, 12.12
', 13.14... Conduit, 15... Four-way valve, 16.
...Introduction pipe, 17...Discharge pipe, I8...Heat source fluid source, 19...Pump, 20...Flow 111 node valve.

Claims (1)

[Claims] 1. A generator equipped with a group of heat transfer tubes through which a heat source fluid is conducted, and an automatic tube cleaning device that scrubs the inner wall by moving a cleaning body within these heat transfer tubes by the flow of the heat source fluid. The absorption refrigerator has a tube opening/closing mechanism that selectively opens and closes the flow path leading to the heat transfer tube to adjust the effective total cross-sectional area of the heat transfer tube, and adjusts the flow rate of the heat source fluid according to the load. to control the refrigeration capacity, and in response to the adjusted flow rate, the effective total cross-sectional area of the heat transfer tubes is adjusted so that the flow velocity within the heat transfer tubes is maintained at a minimum flow velocity that can drive the cleaning body or higher. A method for controlling the refrigeration capacity of an absorption refrigerator, which comprises adjusting a tube opening/closing mechanism.