JPS6269072A - Absorption type water heater and chiller - 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 Application of the Invention] The present invention relates to an absorption type water chiller/heater, and particularly to a control system suitable for taking out cold water and hot water at the same time.

[Background of the invention °]

Conventionally, a method for controlling refrigeration capacity when controlling heat input to a high-temperature regenerator and extracting a portion of the air conditioner based on the heating load is disclosed in JP-A No. 58-2.
As shown in Publication No. 14761, a refrigerant pump,
It controlled the start/stop of the solution pump and the supply of solution to the low temperature regenerator.

Therefore, during combined heating and main supply operation where hot water for heating is mainly taken out and cold water is also taken out at the same time, when the heating load is low, the internal pressure of the high temperature regenerator decreases, and the cooling capacity that can be taken out at the same time also decreases. There was a problem.

[Purpose of the invention]

The purpose of the present invention is when an absorption type water chiller/heater is operated in combination with heating and main supply (operation in which the heat input to the high-temperature regenerator is controlled by the heating load, and the steam generated in the high-temperature regenerator is used to extract cold water in a single-effect cycle). To provide an absorption type water chiller/heater that can secure necessary cooling capacity even when heating load is reduced.

[@ of the invention] The present invention is characterized in that the saturation temperature of steam is changed by changing the water flow rate to the water heater, and the cooling capacity is changed by controlling the heat input to the refrigeration cycle.

[Advantages of invention]

First, the cooling cycle of an absorption type water chiller/heater will be explained with reference to FIG.

The inside of the evaporator 1 is maintained at approximately 1/100 atmospheric pressure, and water, which is a refrigerant, is sprayed by a refrigerant pump 2 onto a heat transfer tube through which cold water 3 passes, absorbs heat from the cold water, and evaporates. This creates a freezing effect. The evaporated refrigerant vapor flows into the absorber 5 maintained at a low pressure by the cooling water 4, where it is absorbed by the lithium bromide aqueous solution sprayed by the solution pump 6, and the lithium bromide aqueous solution becomes diluted. This dilute solution is sent to a high temperature regenerator 8 through a heat exchanger 7 by a solution pump 6, and the rest to a low temperature regenerator 9. In the high temperature regenerator 8, it is directly heated by thermal freezing and separated into steam and a concentrated solution. In addition, in the low-temperature regenerator, it is heated by the steam generated in the high-temperature regenerator, and the steam and concentrated solution are separated.

The solution thus concentrated is again led into the absorber via the heat exchanger 7. On the other hand, a part of the steam generated in the high-temperature regenerator is consumed by heating hot water in the water heater 10, and the remainder heats the solution in the low-temperature regenerator field 9 as described above, and the condensed condensate is led to the condenser 11. It will be destroyed. In addition, the steam generated in the low-temperature regenerator is condensed in the condenser. The condensed refrigerant thus produced is led to the evaporator 1 and goes through the cycle.

Figure 2 shows the cycle during combined heating and main supply operation. The differences from the cooling cycle will be explained below.

The dilute solution in the absorber is sent by the solution pump 6 to the low-temperature regenerator 9 via the heat exchanger 7, where it is heated and concentrated by the steam in the tube, and then guided to the absorber via the heat exchanger 7 again. Further, the vapor evaporated in the low-temperature regenerator 9 is cooled by the cooling water 4 in the condenser 11, and the condensed refrigerant is sent to the evaporator 1 and evaporated to produce a refrigerant effect. Further, in the high temperature regenerator 8, the solution is heated and the generated steam generates hot water in the water heater 10, and the drain returns to the high temperature regenerator again. Further, a part of the vapor flows into the low temperature regenerator p and heats and concentrates the solution outside the tube. This drain is also led to the high temperature regenerator again. As described above, hot water and cold water can be provided by controlling the heat input to the high temperature regenerator according to the load on the hot water side.

FIG. 3 shows the main part of the present invention.

As shown in Fig. 3, a three-way valve 15 is added to the hot water piping, and a cold water outlet temperature sensor 14 reduces the flow rate passing through the water heater when the cold water temperature is high.As a result, the hot water outlet temperature sensor 12 detects a decrease in temperature and controls the temperature. Opening valve 13 increases heat input. As a result, the steam temperature in the high temperature regenerator increases, the heat input to the low temperature regenerator also increases, and the refrigerating capacity increases. Conversely, when the chilled water outlet temperature decreases, the three-way valve 15 increases the flow rate passing through the water heater, and the control valve 13 is closed to reduce the heat input and lower the steam temperature in the high-temperature regenerator, thereby reducing the refrigeration capacity. In this way, the refrigeration capacity can be controlled during combined heating and main supply operation.

〔Effect of the invention〕

As shown in Fukiage, according to the present invention, the cooling capacity can be controlled during combined heating and main supply operation using the three-way hot water valve that is standard equipment in cold/hot water simultaneous extraction type cold/hot water machines.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a refrigeration cycle, FIG. 2 is an explanatory diagram of a combined heating and main supply cycle, and FIG. 3 is a detailed explanatory diagram of the present invention. 1... Evaporator, 2... Refrigerant pump, 3... Chilled water,
4... Cooling water, 5... Absorber, 6... Solution pump, 7... Heat exchanger, 8... High temperature regenerator, 9... Low temperature regenerator, 10... Hot water Vessel, 11... Tsumugi vessel, 12
...Hot water outlet temperature sensor, 13...Fuel control valve,
14...Cold water outlet temperature sensor, 15...Hot water amount control valve.

Claims (1)

[Claims] 1. Evaporator, absorber, regenerator, heat exchanger, solution pump,
In an absorption type water chiller/heater, which consists of a refrigerant pump, a water heater, and piping that operatively connects these, and can extract hot and cold water at the same time, the heat input to the regenerator is controlled according to the load of hot water. An absorption type water cooler/heater characterized by controlling the capacity of cold water by increasing or decreasing the amount of hot water passing through the water heater.