JPH04203769A - Absorption type cold water of hot water device - Google Patents

Abstract

PURPOSE:To prevent a heat transfer of solution and cooling water at an absorption device, prevent an excessive dilution of solution and keep an amount of refrigerant liquid in a refrigerator by a method wherein a part of or an entire amount of rich solution circulating from a regenerator is not dispersed to a heat transfer pipe of the absorption device, but sent again to the regenerator. CONSTITUTION:Condensed solution is fed to an absorption device 5 through a solution heat exchanger 7. A part of or an entire volume of solution is fed to the absorption device 5 through a three-way valve 11 in the midway without being dispersed to a heat transfer pipe 4 of the absorption device or as indicated by a broken line it is fed to a pipe for connecting the absorption device 5 with a condensed liquid pump 6 and again the solution is guided to the regenerator by a solution pump 6. The three- way valve 11 is actively controlled by a controller device 12 and operated such that a refrigerant surface meter 13 is reduced, a refrigerant thermometer 14, a cold water thermometer 15 and a cooling water thermometer 16 are reduced or a dispersed solution volume is reduced in reference to a result of combination calculation. With such an arrangement, since the condensed solution and the cooling water are prohibited for their heat exchanging operation, an excessive dilution of the solution is prevented and further an elimination of the refrigerant liquid in the refrigerator is prevented, so that a stable operation can be continued.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an absorption type cold/hot water unit, and more particularly, to an absorption type cold/hot water unit that is equipped with a control mechanism that can continue stable cooling operation.

[Conventional technology]

The temperature of the cooling water passed through the absorption type chilled/hot water unit is as follows:
There is a lower limit depending on the amount of refrigerant held in the cold/hot water unit. Therefore, by bypass control, the cooling water temperature can be adjusted by controlling the cooling water such that part of the cooling water that has passed through the normal cold/hot water unit goes to the cooling tower, and the other part returns to the cold/hot water unit without passing through the cooling tower. This prevents the temperature from dropping too low.

(Gas absorption chiller/heater handbunk, Japan Refrigeration and Air Conditioning Industry Association, revised 2nd edition, June 1989) [Problem to be solved by the invention] According to the conventional technology, it is possible to control the cooling water temperature during normal operation; When the cooling water temperature is properly cooled by the outside air, such as during startup in winter, temperature control becomes impossible and the water temperature drops below the minimum allowable temperature for the chilled/hot water unit, leading to operational problems such as a lack of refrigerant in the chilled/hot water unit. Something happened.

The object of the present invention is to solve this problem by means of a device within a hot and cold water unit.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an absorber or a pipe connecting an absorber and a solution pump without distributing part or all of the concentrated solution recirculating from a high-temperature and low-temperature regenerator through a heat transfer tube of the absorber. The system is equipped with a mechanism for sending the liquid to the regenerator again using a solution pump.

[Effect]

By sending part or all of the concentrated solution flowing back from the regenerator to the regenerator without distributing it to the absorber heat transfer tubes, heat transfer between the solution and the cooling water in the absorber is inhibited. This prevents excessive dilution of the solution, allowing the amount of refrigerant in the machine to be maintained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a system diagram showing an operating system of an absorption type cold/hot water unit according to an embodiment of the present invention, and FIG. 2 is a system diagram of a dual effect absorption type cold/hot water unit.

First, the refrigeration cycle of a dual-effect absorption refrigerator will be explained with reference to FIG.

The inside of the evaporator 1 is maintained at about 1/100th of an atmospheric pressure.

Water, which is a refrigerant, is sent to the evaporator 1 by a refrigerant pump 2, and is spread over heat transfer tubes 3 through which the cold water flows, absorbing heat from the cold water and evaporating. This produces a cooling effect. The evaporated refrigerant vapor flows into the absorber 5 kept at low pressure by cooling with cooling water passing through the heat transfer tube 4, where it is absorbed by the lithium bromide aqueous solution sprayed by the solution pump 6, and the lithium bromide aqueous solution is Become thin. This diluted solution is sent by a solution pump 6 through a solution heat exchanger 7, a portion of which is sent to a high temperature regenerator 8, and the remainder to a low temperature regenerator 9. This dilute solution is directly supplied to the heat source (
In the low-temperature regenerator 9, it is heated by the steam generated in the high-temperature regenerator 8 and is separated into steam and a concentrated solution.

The solution thus concentrated is again led to the absorber 5 via the solution heat exchanger 7. Drainage obtained by heating and condensing the solution in the low-temperature regenerator 9 is led to the condenser 10. Also,
The steam generated in the low temperature regenerator 9 is condensed in the condenser 1o.

The condensed refrigerant thus produced is led to the evaporator 1,
Complete the cycle.

Next, the structure and operation of the absorption type cold/hot water unit of this embodiment will be explained with reference to FIG.

The melted solution is guided to the absorber 5 via the solution heat exchanger 7, but on the way, a three-way valve 11 prevents part or all of the amount from being spread to the absorber heat exchanger tube 4, and the solution is transferred to the absorber 5 or As shown by the broken line, the solution is guided to a pipe connecting the absorber 5 and the concentrated solution pump 6, and is again guided to the regenerator by the solution pump 6. ``The three-way valve 11 is actively controlled by the control device 12, and its operation is controlled by the decrease of the refrigerant level gauge 13, the decrease of the refrigerant temperature gauge 14. Cold water thermometer 15. It operates so that the amount of solution to be sprayed decreases depending on whether the cooling water thermometer 16 decreases or the result of a combination of calculations.

This inhibits heat exchange between the concentrated solution and the cooling water, thereby preventing excessive dilution of the solution, thereby preventing the in-machine refrigerant liquid from running out, allowing stable operation to continue.

〔Effect of the invention〕

According to the present invention, even when the cooling water temperature is low and uncontrollable, by controlling absorber heat transfer, a shortage of refrigerant in the machine due to excessive dilution can be prevented, so stable operation can be continued.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a conventional system diagram. 1... Evaporator, 2... Refrigerant pump, 5... Absorber. 'lJ1 figure

Claims (1)

[Claims] 1. Evaporator, absorber, high and low temperature regenerator, heat exchanger,
In an absorption type cold/hot water unit consisting of a solution pump, a refrigerant pump, and a piping system that operatively connects these, part or all of the solution flowing back from the high temperature and low temperature regenerators to the absorber is The absorption characterized by having a mechanism in which the absorber does not spread to the heat transfer tube of the absorber, but flows into the absorber or a tube connecting the absorber and the solution pump, and is sent to the regenerator again by the solution pump. Type cold/hot water unit.