JPS5921957A - Absorption cold and hot water machine - 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] (a) Technical field of the invention The present invention relates to an absorption chiller/heater that can take out cold and hot water simultaneously;
In particular, it relates to a mechanism for adjusting the natural exchange surface between the cooling water pipe housed in the condenser and the refrigerant vapor.

(b) Conventional technology Figure 1 shows a conventional example of an absorption chiller/heater that takes out cold and hot water simultaneously. (1) is a high temperature regenerator, (2) is a low temperature regenerator, and (3) is a low temperature regenerator. (4) is an evaporator, (5) is an absorber, (6) and (7) are low temperature and high temperature solution heat exchangers, respectively, and (8) is a water heater attached to a high temperature regenerator. are refrigerant conduit (9), refrigerant liquid flow down pipe (10), refrigerant pump (
11) with a refrigerant circuit (15). Refrigerant liquid drain pipe (
13), a diluted liquid tube (15) with a solution pump (14),
The pipes are connected by an intermediate liquid pipe (16) and a concentrated liquid pipe (17) to form a circulation cycle of refrigerant and absorption liquid, and cold water is obtained from the pipe (18) stored in the evaporator and stored in the water heater (8). Hot water is obtained from the water pipe (19). Then, the tube (1
The opening degree of the refrigerant control valve (21) installed in the refrigerant conduit (9) is controlled based on the signal from the temperature detector (20) installed in the refrigerant pipe (9), and the evaporator (4) is adjusted to correspond to the magnitude of the chilled water load. ), and also controls the opening of the drain control valve (23) installed in the refrigerant liquid drain pipe (13) based on the signal from the temperature sensor (22) installed in the water pipe (19). temperature control is carried out to adjust the heat exchange area between the water pipe (19) in the water heater (8) and the refrigerant vapor to take out hot water corresponding to the load, and both the detectors (20) and (22) ), these signals are input to the fuel control valve (26) for the combustion heating chamber (25) of the high temperature regenerator (1) to open the control valve. By controlling the temperature, the amount of heating to the high temperature regenerator (1) corresponding to both cold and hot water loads is controlled.

(c) Problems with the prior art In the prior art described above, when the hot water load is large and the chilled water load is small, for example in winter, the refrigerant conduit (9)
Even though refrigerant generation in the low-temperature regenerator (2) is suppressed by reducing the flow rate of refrigerant in the refrigerant, the intermediate liquid flowing from the high-temperature regenerator (1) to the low-temperature regenerator (2) self-evaporates. There is a problem in that the latent heat due to self-evaporation is wastefully discarded outside the machine by the cooling water flowing in the cooling water pipe (27) housed in the condenser (3), resulting in a decrease in the coefficient of performance of the absorption chiller/heater. This is because in winter, the cooling water temperature decreases as the outside air temperature decreases, and when the chilled water load is small, the refrigerant control valve (21) is adjusted to reduce the amount of refrigerant supplied to the evaporator (4). ) to reduce the amount of refrigerant absorbed by the absorber (5), thereby reducing the refrigerating capacity.As a result, the amount of heat generated by refrigerant absorption in the absorber (5) decreases. , the temperature of the cooling water flowing into the condenser (3) becomes lower, and the pressure inside the condenser decreases, while the hot water load is large, so the amount of heating applied to the high temperature regenerator (1) is large. This is because the temperature of the intermediate liquid flowing from the regenerator is high.

(d) Problems and means for solving them In view of these problems, the present invention, in the above-mentioned conventional absorption chiller/heater, increases or decreases the flow rate of refrigerant liquid from the condenser to the evaporator in accordance with the magnitude of the chilled water load. When the chilled water load is small, the refrigerant level accumulated in the condenser is increased to reduce the heat exchange area between the cooling water pipes in the condenser and the refrigerant vapor, thereby reducing the latent heat of condensation of the refrigerant vapor. Performance of absorption chiller/heater, especially in winter when the isothermal water load is large and the chilled water load is small, by reducing the amount of water released outside the machine, and also by preventing the drop in the internal pressure of the condenser and preventing self-evaporation of the intermediate liquid. This achieved an improvement in the coefficient.

(E) Embodiment FIG. 2 shows an embodiment of the present invention, and components similar to those shown in FIG. 1 are given the same reference numbers. In FIG. 2, (28) is the refrigerant liquid down pipe (10
), the control valve reduces its opening when the chilled water temperature decreases, that is, the chilled water load decreases, and the chilled water temperature rises, that is, the chilled water load increases, according to the signal from the temperature detector (20). Then, the opening is controlled to increase.

Therefore, when the cold water load decreases, the temperature sensor (20
), the opening degree of the refrigerant control valve (21) is reduced to reduce the flow rate of refrigerant flowing through the refrigerant conduit (9), thereby increasing the amount of refrigerant generated in the low-temperature regenerator (2) and the amount of refrigerant condensed from the high-temperature regenerator (1). vessel(
3) to reduce the amount of refrigerant flowing into the condenser, and at the same time reduce the opening degree of the refrigerant liquid control valve (28) to reduce the amount of refrigerant flowing through the refrigerant liquid down pipe (10); Raise the refrigerant liquid level accumulated in the condenser (3) to reduce the heat exchange area between the cooling water pipe (27) in the condenser and the refrigerant vapor,
Reduce the amount of refrigerant condensed in the condenser (3). As a result, a drop in the internal pressure of the condenser (3) is prevented, self-evaporation of the intermediate liquid is reduced, and heat loss due to the latent heat of vaporization being discarded outside the machine by cooling water is also reduced. 4) Since the amount of refrigerant liquid supplied is reduced and the refrigeration capacity is suppressed, cold water for cooling can be efficiently obtained in accordance with the reduction in the chilled water load. Also, when the chilled water load increases, contrary to the case where the chilled water load decreases,
By increasing the opening degrees of the refrigerant control valve (21) and the refrigerant liquid control valve (28) in response to an increase in load, chilled water for cooling can be efficiently obtained in accordance with an increase in chilled water load.

Opening control of the drain control valve (23) in response to increases and decreases in hot water load and fuel control valve (23) in response to increases and decreases in both cold and hot water loads
Since the opening degree control is the same as that of the conventional example shown in FIG. 1, the explanation thereof will be omitted.

Although not shown, the temperature detector (20) is used to detect the load.
), a calorimeter may be used instead of (22),
Further, a mechanism may be provided to adjust the flow rate of the diluted liquid based on the signal from the chilled water load detector.

(f) Effects of the invention As described above, the present invention attaches a water heater to the high-temperature regenerator of a dual-effect absorption refrigerator, and controls the amount of heating to the high-temperature regenerator depending on the magnitude of both cold and hot water loads. In an absorption chiller/heater with simultaneous extraction of cold and hot water, the refrigerant flow rate from the high temperature regenerator to the condenser via the low temperature regenerator and the refrigerant flow rate from the condenser to the evaporator are determined depending on the magnitude of the chilled water load. Equipped with a mechanism to increase or decrease the amount of refrigerant supplied to the evaporator, it adjusts the refrigerating capacity and at the same time adjusts the pressure inside the condenser to prevent heat loss due to self-evaporation of the intermediate liquid flowing into the low-temperature regenerator. Because of this, it is possible to efficiently obtain cold water according to the load, especially in winter when the cooling water temperature is low and the hot water load is large.
When the chilled water load is small, heat loss from the condenser, such as heat loss due to self-evaporation of the intermediate liquid, is suppressed in response to the heating input to the high-temperature regenerator, making it possible to efficiently obtain chilled and hot water output. It has the effect of improving the coefficient of performance.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a circuit configuration showing a conventional example of an absorption chiller/heater, and FIG. 2 is a schematic explanatory diagram of a circuit configuration showing an embodiment of the absorption chiller/heater of the present invention. (1)...High temperature regenerator, (2)...Low temperature regenerator, (
3)... Condenser, (8)... Water heater, (20), (
22)... Temperature detector, (21)... Refrigerant control valve,
(23)...Drain control valve, (24)...Controller,
(26)...Fuel control valve, (27)...Cooling water pipe,
(28)...Refrigerant liquid control valve.

Claims (1)

[Claims] (1) A water heater is attached to the high-temperature regeneration type of the dual-effect absorption chiller, and the amount of heating to the high-temperature regenerator is controlled to increase or decrease depending on the magnitude of both cold and hot water loads. The method is characterized by comprising a mechanism for increasing or decreasing the refrigerant flow rate from the high temperature regenerator to the condenser via the low temperature regenerator and the refrigerant flow rate from the condenser to the evaporator in accordance with the large chilled water load. Absorption cold water machine.