JPS6159166A - 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 (a) Field of Industrial Application The present invention relates to an improvement in an absorption refrigerator in which the amount of heating of a generator is adjusted according to the load.

(B) Conventional technology In absorption refrigerators, it is generally done to extract cold water that matches the load by controlling the refrigerating capacity by adjusting the heating amount of the generator. For example, when the load is cut in half, the amount of heat generated by the generator is cut in half and the refrigeration capacity is cut in half. When considered from the perspective of the heat balance of the absorption chiller, this means that the amount of heat input into the machine, that is, the amount of heat absorbed by the generator and evaporator, is halved, and the amount of heat released by the absorber and condenser is halved. In other words, this means nothing more than halving the amount of heat output to the outside of the machine. Therefore, in an absorption refrigerator that adjusts the heating amount of the generator according to the load, in order to safely and quickly take out cold water that matches the load, for example, when the amount of heat input to the absorption refrigerator is halved, It is also necessary to quickly reduce the amount of heat output from the absorption chiller by half to quickly balance the heat balance. As a conventional technique for quickly reducing the amount of heat output (the amount of heat dissipated from the absorber and condenser) by half, there is a method for halving the number of operating cooling water pumps using a signal from a load detector (for example, Japanese Patent Publication No. 53-2216 There is a public notice).

(C) Problems to be Solved by the Invention The conventional means as described above can only be used when the temperature of the cooling water flowing into the absorption chiller (hereinafter referred to as the cooling water inlet temperature) is maintained at approximately the rated value. Although this method is useful, it has the problem that it is difficult to continue operating the absorption refrigerator safely when the cooling water inlet temperature changes. For example, if the cooling water inlet temperature increases, the cooling water outlet temperature (the temperature of the cooling water flowing out from the condenser of an absorption chiller) also increases, resulting in higher temperatures and pressures inside the condenser and generator. Become. This also increases distortion and corrosion of the components inside these devices (especially in dual-effect absorption refrigerators).
(Due to the distortion of the parts inside the high temperature generator and the corrosion of the parts by the high temperature absorption liquid, the protection device is activated and the operation is stopped.)

Conversely, if the cooling water inlet temperature becomes too low,
Since there is a risk of freezing of the cold water or crystallization of the absorption liquid, a protective device will be activated and the operation will be stopped.

SUMMARY OF THE INVENTION In view of these problems, the present invention aims to provide an absorption refrigerating machine that can safely continue operation and extract chilled water suitable for the load.

B) Means for Solving the Problems The present invention provides, as a means for solving the above problems, an absorption refrigerator that adjusts the heating amount of the generator according to the load.
The configuration is such that the flow rate of the cooling water is adjusted according to the load while compensating the flow rate of the cooling water using the cooling water inlet temperature.

(e) Effect In the means according to the present invention, the load is, for example, 5 of the total load.
0% and the cooling water inlet temperature is lower than the rated value, the cooling water flow rate is not reduced by 50% as in conventional means, but the cooling water flow rate is reduced by more than 50%. It has the function of balancing the heat balance by adjusting the water flow rate and keeping the cooling water outlet temperature at approximately the rated value, so if the temperature of the absorption liquid sprayed inside the absorber drops too much, the absorption liquid crystallizes. There is little risk that the cold water will freeze, and it is possible to safely take out the cold water that corresponds to the 50% load. Conversely, if the cooling water inlet temperature is higher than the rated value, the degree of reduction in the cooling water flow rate is adjusted to 50% or less to maintain the cooling water outlet temperature at approximately the rated value and balance the heat balance. It is unlikely that the temperature and pressure inside the generator will rise excessively and activate the protective device.
It becomes possible to safely extract cold water corresponding to 50% load.

(v) Embodiment The drawings are schematic configuration explanatory diagrams showing one embodiment of the absorption refrigerator according to the present invention, in which (1) is a high temperature generator, (2) is a low temperature generator, (3) is a condenser, (4) is an evaporator, (5) is an absorber, (6) and (7) are high temperature and low temperature solution heat exchangers, (8
) is a pump for refrigerant liquid, (9) is a pump for absorption liquid,
These devices include a pipe through which the refrigerant flows (a), α-no, a pipe through which the refrigerant liquid flows (6), a pipe through which the refrigerant liquid flows back (to), a pipe through which the α-conversion product is sent (g), αG, an absorption liquid. The flowing pipe αη,
al19. The conventional two is connected by diversion to the pipe through which the absorption liquid flows.

It forms a circulation path for refrigerant (water) and absorption liquid (lithium bromide aqueous solution) similar to that of a type-driving absorption refrigerator.

(Foundation) is the combustion heating chamber of the high temperature generator (1), (A),
... is the pipe through which the combustion gas flows, the wire is the heater of the low temperature generator (2), (F) is the cooler of the condenser (3), (2) is the heat exchanger of the evaporator (4), and (H) is the cooler of the condenser (3). ) is a cooler for the absorber (5), (F) is a cooling tower, and [F] is a cooling water pump with variable discharge amount.

The wire is the pipe connecting the cooling tower (b) inlet side and the cooler (c) outlet side, □ is the cooling water pump ■Suction side and cooling tower (goods)
(1) is the pipe that connects the cooler (A) inlet side and the cooling water pump (2) discharge side, 61) is the pipe that connects the cooler (C) inlet side and the cooler cutout. This is the tube that connects the sides.

In addition, (2), the trowel is a pipe that connects the heat exchanger (c) and the heat exchange unit [not shown] on the load side, and (b) is a fuel supply pipe to the combustion heating chamber 91). .

■ is a fuel control valve installed in the fuel supply pipe, and the opening degree of this fuel control valve is determined by the signal from the temperature sensor (Sl) installed in the pipe on the outlet side of the heat exchanger (2). 0, the high temperature generator (
The amount of heating in step 1) is adjusted to 5 IC according to the load.

° It also adjusts the discharge amount of the controller (Q is the cooling water pump CP in response to the signal from the temperature sensor (S, ), and the controller (0 is the pump CP). ) The degree of adjustment of the discharge amount of the pump CP is compensated and adjusted based on the signal from the temperature detector (S7) that detects the cooling water temperature on the discharge side [cooling water temperature on the absorption chiller inlet side (cooling water inlet temperature)]. A built-in regulator (5) such as a microprocessor and a compensation circuit is provided.

Next, an example of the control operation of the cooling water flow rate in the absorption chiller configured as described above (hereinafter referred to as the present machine) will be explained while comparing it with that of a conventional absorption chiller (hereinafter referred to as the conventional machine).

Here, the load Y [%], the rated value of the cooling water inlet/outlet temperature are T, c, T□, [:℃), respectively, and the cooling water inlet/outlet temperature is T, respectively. 'rzc'c), the compensation rate due to the adjustment factor of this machine is 2,100% compared to the cooling water flow rate [pump [F] discharge rate] at Y% load.
If expressed in [%], for this machine, X = Y - Z...
■Z=CToc-Tic)/(Toc-Ti) -
−■ It is designed to be. Then, in this machine &To=Tj+(Toc-Tic)・(Y/X)-"
・■ holds; on the other hand, in the conventional machine, the relational expression of X=Y and T. The relational expression = Ti+ (Toc-Tic) holds true.

Now, the cooling water flow rate at 100% load is the same for both this machine and the conventional machine, and T, c, and Tic are each 37.
5°C132°C, 100%
The X [degree of cooling water flow rate] and TiC cooling water outlet temperature] of this machine and the conventional machine with respect to T and [cooling water inlet temperature] at load CY = 1001 and 50% load [Y = 50] are shown above. The following table shows the results obtained from the relational expression and compared.

As is clear from the table above, in the conventional machine, T, [
T when the cooling water inlet temperature changes. [Cooling water outlet temperature]
T also changes, whereas in this machine T. is the rated value CT
oc”: It can be seen that it is maintained at J.

Therefore, this machine maintains almost the same operation as the rated operation, and can continue to operate safely.

In addition, in this machine, in addition to the load, there is a means to maintain the cooling water outlet temperature at the rated value by controlling the discharge amount of the pump ■ according to the cooling water outlet temperature (for example, the
It is also possible to adopt the method disclosed in Japanese Patent Publication No. 765. However, with this method of detecting changes in the cooling water inlet temperature by changes in the cooling water outlet temperature, changes in the cooling water inlet temperature cannot be accurately determined until the heat balance is balanced. This method is not suitable for cases where a single absorption refrigerator is used to supply cold water.

Furthermore, in the embodiment shown in the figure, a case was explained in which a cooling water pump ψ) with a variable discharge amount was used.
It goes without saying that a control valve may be provided in the cooling water circulation path in place of the variable discharge pump, and the opening degree of this control valve may be controlled.

(Effects of the Invention As described above, the present invention is designed to control the degree of adjustment of the cooling water flow rate to the absorption chiller according to the load while compensating the degree of adjustment of the cooling water flow rate to the absorption chiller with the cooling water inlet temperature. This provides the effect of safely and quickly taking out cold water suitable for the load while keeping the outlet temperature almost constant.

[Brief explanation of the drawing]

The drawing is a schematic structural explanatory diagram showing one embodiment of an absorption refrigerator according to the present invention. (1)...High temperature generator, (2)...Low temperature generator,
(3)... Condenser, (4)... Evaporator, (5
)...Absorber, (C)...Cooler, (B)...
・Heat exchanger, (E)...Cooler, (B)...Cooling tower, (E), (To), (1), 3υ, (2), (To)...Pipe, ( 4)...Regulator, (0...Controller, (g)...Variable discharge amount cooling water pump, (S,
), (S2)...Temperature detector, Leap...Fuel control valve.

Claims (1)

[Claims] (1) An absorption chiller equipped with a mechanism that adjusts the heating amount of the generator based on the signal from the load detector, is equipped with a control mechanism that uses the signal from the load detector to adjust the flow rate of cooling water supplied into the machine by the pump. , and the control mechanism is equipped with an adjustment mechanism that compensates the degree of adjustment of the cooling water flow rate based on the temperature of the cooling water flowing into the machine.