JPS6135895Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an absorption chiller that uses a water heat exchanger in the condenser and absorber, and in particular, even if the cooling water flow rate is changed according to the output of the absorption chiller, the condenser and absorber This invention relates to a water circulation system for an absorption refrigerator that prevents the flow rate of water from changing significantly inside the vessel, thereby reducing scale buildup inside the heat exchanger.

Absorption refrigerators that use water as a refrigerant and lithium bromide or lithium chloride as an absorbent are widely used as cold and hot water supply devices for air conditioning and heating using water heat exchangers in the condenser and absorber. In addition, such an absorption refrigerator adjusts the heating amount of the generator in response to an increase or decrease in the cooling/heating load, controls the number of pumps in operation, or controls the rotational speed of the pumps that supply cooling water to the condenser and absorber. It is.

However, in conventional absorption chillers, when the amount of cooling water supplied decreases, the flow velocity of water in the pipes of the water heat exchanger also decreases in accordance with the amount of decrease in the amount of water supplied, resulting in the formation of stale in the tubes and the rate of heat transmission. This caused the absorption chiller's capacity to drop more than necessary.

In view of these points, the present proposal eliminates the above-mentioned damage by constructing an absorption chiller with two or more water heat exchangers for each of the condenser and absorber to form multiple independent water circulation systems. The present invention will be explained below based on an embodiment in which the number of water pumps or the number of rotations of the water pumps is controlled.

In FIG. 1, 1 is a generator that raises the temperature of a dilute absorption liquid that has absorbed a refrigerant with a heater 2 and vaporizes and separates the refrigerant;
3 is a condenser composed of two water heat exchangers 5 and 6 housed in the same body 4 as the generator 1; 7 is a condenser that vaporizes the liquid refrigerant cooled by the condenser 5 under reduced pressure conditions; an evaporator that cools the cooling water circulating in the heat exchanger 8 and supplies it to the cooling load 9 outside the machine;
Reference numeral 10 denotes an absorber composed of two water heat exchangers 12 and 13 housed in the same vessel body 11 as the evaporator 7; The vessels 5, 6, 12, 13 are connected by two cooling water pipes 14, 15 to form two independent condensation absorption cooling water systems 16, 17.
Moreover, 18 is the above-mentioned condenser 3 and absorber 10
It is a cooling water reservoir that supplies cooling water to each condensed cooling water system 16, 17, and an independent water pump 19,
20 and cooling towers 21 and 22.

In the water circulation system A of the absorption refrigerator of the present invention having such a configuration, normally two water pumps 1 are used.
9 and 20 and supplying cold water for cooling to the cooling load 9, when the amount of load decreases,
Reduce the amount of heating in the generator 1 and one water pump and cooling tower e.g. 19,20
When the operation of the absorption chiller is stopped, the water circulation to the condensed absorption cooling water system 16 side in the absorption refrigerator is stopped, so the cooling function of the condenser 3 and the absorber 10 is also reduced. In the absorption cooling water system 17, the water pump 20 and cooling tower 22 are not affected by the suspension of operation, and there is no change in the flow rate or flow rate of water flowing through the water heat exchangers 6, 13, so there is no possibility of scale buildup inside the pipes or It is possible to reduce the load amount and reduce the condensing capacity and absorption capacity in accordance with the reduction in the amount of heating in the generator 1 without causing an unexpected decrease in heat transfer coefficient.

Note that FIG. 2 shows another embodiment of the present invention, and the water heat exchanger used in the condenser 3a and absorber 10a has three tube groups 23a, 23a', and
23a'', and three independent condensing and absorption cooling water systems 16a, 16a', 16 along with water pumps 21a, 21a', 21a''.
a'', so that the reduction in capacity of the condenser 3a and absorber 10a can be subdivided and adjusted in stages.

In addition, although the water pump is shown as an example in which each cooling water system is independent, as shown in FIG. the number of valves 26b,
It may be increased or decreased by 26b'.

Furthermore, the number of water heat exchangers constituting the condenser and absorber is not limited to the above embodiments, and can be appropriately set depending on the capacity of the water pump and the like.

In this way, the proposed absorption chiller water circulation system has multiple independent water systems for supplying cooling water to the condenser and absorber of the absorption chiller, and the water circulation system for the absorption chiller uses multiple independent water systems to supply cooling water to the absorption chiller according to the amount of water supplied to the absorption chiller. Since the number of water systems can be increased or decreased, there is no need to worry about scale build-up due to a decrease in the flow velocity in the pipes in the heat exchanger during water flow, or a decrease in the capacity of the absorption chiller due to a change in heat transmission coefficient, making it easy to operate the number of water pumps. It is possible to control the amount of water depending on the amount of water or the amount of load.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of an absorption refrigerator equipped with a water circulation device according to the present invention, Fig. 2 is a block diagram showing another embodiment, and Fig. 3 is an example of the structure of a water heat exchanger. A plan view and a side view of the main part broken,
FIG. 4 shows the main components of another embodiment of the present invention. 3... Condenser, 10... Absorber, 5, 6, 1
2, 13... Water heat exchanger, 16, 17... Condensation absorption cooling water system.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In an absorption refrigerator in which a refrigeration cycle is composed of a regenerator, a condenser, an evaporator, an absorber, etc., and each of the condenser and absorber has a plurality of water heat exchangers. , the water heat exchangers individually condense the refrigerant and cool the absorption liquid, so that each water heat exchanger of the condenser and the water heat exchanger of the absorber corresponding to these water heat exchangers cool each other. The cooling water systems are connected by water pipes to form a plurality of cooling water systems, and each of these cooling water systems has a water amount adjustment means that adjusts the amount of supplied cooling water according to the output of the absorption chiller, and a cooling water used according to the adjusted amount of cooling water. 1. A circulation device for an absorption refrigerating machine, comprising means for increasing or decreasing the number of cooling water systems used. 2. The device according to claim 1, wherein the water amount adjusting means and the cooling water system increase/decrease means are water pumps provided in each cooling water system. 3. The device according to claim 1, wherein the water amount adjusting means is one water pump capable of distributing and supplying cooling water to all the cooling water systems, and the cooling water system increasing/reducing means used is a valve installed in each cooling water system.