JPH0796978B2 - Absorption refrigerator operation monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an improvement of an operation monitoring device for an absorption refrigerating machine, an absorption heat pump device and the like (hereinafter referred to as an absorption refrigerating machine).

<Prior art> As a conventional technology for operation monitoring of an absorption refrigeration machine, the inlet / outlet temperature of cooling water, which is one fluid that exchanges heat with each other in a condenser of an absorption refrigeration machine, and the other fluid that exchanges heat with this cooling water are used. The outlet temperature of a certain refrigerant, that is, the temperature of the condensed refrigerant is detected, and based on the data for estimating the predetermined fouling state from these detected temperatures, the fouling state of the heat transfer tube of the condenser is calculated as shown in FIG. , Means for displaying this (Japanese Patent Publication Sho 61-
15993). It is to be noted that FIG. 3 is a graph showing a method of calculating the dirty state, in which T ₁ is the cooling water inlet temperature, T ₂ is the cooling water outlet temperature, and T ₃ is the condensed refrigerant temperature. The vertical axis represents temperature (° C) and the horizontal axis represents refrigerating capacity (%). The zone (red zone) above the broken line showing dirt a ₂ is in a state of severe dirt, and one point shows dirt a _1. The zone below the chain line (blue zone) represents a less dirty state, and the middle zone (yellow zone) represents a less dirty but considerably dirty state. The solid line inclined to the lower right is a graph showing the relationship between the difference between the inlet and outlet temperatures of cooling water and the refrigerating capacity.

Then, in this conventional means, when the cooling water inlet / outlet temperature difference is [T ₂ −T ₁ ], the temperature difference [T ₂ −T ₁ ] is set with the intersection of the arrow line and the solid line as the starting point. Find the corresponding refrigeration capacity Q _Y. On the other hand, detects a condensation refrigerant temperature and the cooling water outlet temperature, in which case the temperature difference is, for example, [T ₃ -T _2], to obtain the intersection P _Y with arrows and the arrows refrigerating capacity Q _Y, It indicates that the dirt condition is in the yellow zone.

<Problems to be Solved by the Invention> In the above-mentioned conventional means, as the refrigerating capacity of the absorption refrigerating machine becomes smaller, the zone showing the state of dirt becomes narrower (see FIG. 3). However, there is a problem in that a display different from the actual state of dirt can be easily displayed. For example, if the stain state at the intersection P _Y when the refrigerating capacity Q _Y is real with it, the refrigerating capacity was reduced to Q _X of Q _Y 1/4 cooling load is reduced to 1/4 If the detected temperature [T ₃ −T ₂ ] is not within the range of 0.5 to 0.25 ° C, a display different from the actual stain state, that is, a red zone or a blue zone is displayed.

The present invention has been made in view of this problem, and an object thereof is to provide an apparatus capable of grasping the state of dirt more correctly than the conventional apparatus.

<Means for Solving the Problems> The present invention provides a measuring device for the cold water inlet / outlet temperature difference ΔT _E of an absorption refrigerator, a refrigerant temperature T _R and a cooling water outlet temperature of a condenser of the absorption refrigerator.
Measuring device for the difference in T _C [T _R −T _C ], an arithmetic unit that calculates the ratio of [T _R −T _C ] to ΔT _E while receiving these signals, and a calculated ratio [T _R −T _C The operation monitoring device for the absorption chiller is composed of an indicator that displays _C ] / ΔT _E as a dirt index and a printer that prints out as a dirt index.

<Operation> Dirt on the heat transfer tube of the condenser of the absorption refrigerator and the temperature difference [T _R
-T _C ], the temperature difference increases as the dirt gets worse. On the other hand, this temperature difference is proportional to the cold water load, and is proportional to the cold water inlet / outlet temperature difference ΔT _E of the absorption refrigerator in the case of a constant cold water flow rate. Therefore, the temperature difference [T _R
Although it is not possible to accurately grasp the degree of contamination of the heat transfer tube of the condenser only by the magnitude of −T _C ], the degree of contamination is
It can be seen that it is related to the ratio of T _E to the temperature difference [T _R −T _C ].

Then, according to experiments, when the degree of fouling of the heat transfer tube of the condenser is constant, regardless of the cold water load, [T _R -
It was confirmed that the value of T _C ] / ΔT _E was almost constant as shown in FIG. It was also confirmed that the larger [T _R −T _C ] / ΔT _E was, the more severe the stain was.

In the device of the present invention, by calculating [T _R −T _C ] / ΔT _E , it is possible to correctly grasp the degree of fouling of the heat transfer tube of the condenser even when the cold water load is small.

<Embodiment> FIG. 1 is a schematic structural explanatory view showing an embodiment of an absorption refrigerator according to the present invention. In FIG. 1, A is an absorption refrigerator, which is a high temperature generator 1, a low temperature generator 2, a condenser 3, an evaporator 4, an absorber 5, a low temperature high temperature solution heat exchanger 6,7. , The refrigerant pump P _R and the solution pump P _A are connected to the refrigerant lines 8 and 9, the refrigerant liquid flow-down line 10, and the refrigerant liquid recirculation line 1.
1,12, pipelines for dilute solution 13,14, pipelines for medium concentration solution 15,16
And the concentrated solution pipes 17 and 18 are connected to form a circulation path for the refrigerant (water) and the solution (lithium bromide aqueous solution). In addition, 19 is a refrigerant blow pipe line with a manual valve V _B.

20 is a combustion heating chamber of the high temperature generator 1, 21, 21 ... are combustion gas passages, 22 is a combustion gas exhaust passage, 23 is a low temperature generator 2 heater, 24 is a condenser 3 cooler, and 25 is Heat exchanger of the evaporator 4,
Reference numeral 26 is a cooler of the absorber 5, and B is a burner provided in the high temperature generator 1.

F is a fuel supply passage connected to the burner B, 27 and 28 are cold water pipes connected to the heat exchanger 25, and 29, 30 and 31 are coolers 2
This is a cooling water pipeline in which 6,24 are connected in series.

V _F is a control valve installed in the fuel supply path F, S ₁ and S ₂ are temperature sensors at the cold water inlet / outlet, S _L is a temperature sensor at the cooling water outlet, and S _R
Is a temperature sensor for the refrigerant of the condenser 3.

M _E is a measuring instrument electrically connected to the temperature sensors S ₁ and S _2, and this measures a temperature difference ΔT _E obtained by subtracting the cold water outlet temperature from the cold water inlet temperature. M _C is a temperature sensor
A measuring device electrically connected to S _R and S _C , which measures the temperature difference [T _R −T _C ] obtained by subtracting the cooling water outlet temperature T _C from the refrigerant temperature T _R of the condenser 3. . And again, J is a measuring instrument
M _C, a microcomputer built-in calculator, which is connected to the M _E, thereby the temperature difference with respect to the temperature difference △ T _E [T _R -
The ratio K _X of T _C ] is calculated. S _k is a set part of the computing unit J. The ratio K _X calculated here is used as a stain index and is printed out on the other printer C _V displayed on the display H.

An example of printout is shown in FIG.

The temperature sensor S _R may be provided in the conduit 10. Furthermore, the sensor S _R may be replaced with a pressure sensor instead of the temperature sensor. In this case, the refrigerant temperature can be obtained by calculating the saturation temperature corresponding to the saturated vapor pressure of the refrigerant.

Absorption refrigerator A equipped with the operation monitoring device configured as described above
In the above, in the case where the heat transfer tube of the condenser 3 is hardly contaminated, K _X becomes a value close to, for example, 0.5 (see FIG. 2), and as the contamination becomes larger, K _X also becomes larger.

According to the experiment, when a copper tube is used as the heat transfer tube of the condenser 3, [T _R − with respect to ΔT _E when the contamination is severe
The value of T _C ] was 0.7 or more.

Therefore, it became possible for the operation manager to know the degree of contamination of the heat transfer tube by looking at the stain index on the display or by looking at the printed matter from the printer.

As a result, the operation manager can properly clean the heat transfer tubes.

<Effects of the Invention> As described above, according to the present invention, regardless of the magnitude of the load,
By checking the display or the print from the printer, you can accurately grasp the state of dirt on the heat transfer tube of the condenser of the absorption refrigerator, and you can properly decide the cleaning time, The effect of preventing the operation efficiency of the absorption refrigerator from lowering due to excessive fouling of the heat transfer tube is brought about. Moreover, there is an effect of preventing a decrease in the operating rate of the absorption refrigerating machine, which is caused by stopping the operation of the absorption refrigerating machine at a time when the cleaning is not necessary.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view of an absorption refrigerating machine equipped with an operation monitoring device as an embodiment of the present invention, and FIG. FIG. 3 is a graph showing the relationship between the ratio and the cold water load, FIG. 3 is a graph showing the method of calculating the dirt state of the heat transfer tube in the conventional means, and FIG. 4 is a printout drawing of the dirt index. . ... Absorption refrigerator, 1 ... High temperature generator, 3 ... Condenser, 4
…… Evaporator, S ₁ , S ₂ , S _R , S _C …… Temperature detector, M _C , M _E …… Measuring instrument, J …… Judgement unit, S _K …… Set unit, H …… Display unit ,
C _V …… Printer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Kishimoto 2-18 Keihanhondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Toshiyuki Kaneko 2-18th Keihanhondori, Moriguchi City, Osaka Sanyo Denki Incorporated (72) Inventor Tatsuo Miyagi 2-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-56-146966 (JP, A) JP-A-63-70055 (JP) , A) JP-A-1-123959 (JP, A)

Claims (1)

[Claims] 1. A chilled water temperature difference measuring device for detecting a cold water inlet / outlet temperature of an absorption chiller while measuring the difference between the chilled water temperature measuring device and a refrigerant temperature of a condenser of the absorption chiller and a cooling water outlet temperature for measuring the difference. Meter, a calculator that calculates the ratio of the difference between the refrigerant temperature of the condenser and the outlet temperature of the cooling water with respect to the cold water temperature difference while receiving the signals of these measuring devices, and an indicator that displays this ratio as a dirt index or An operation monitor of an absorption refrigerating machine, comprising: a printer that prints out using the above ratio as a dirt index.