JPH07133970A - Freezer - Google Patents

Abstract

PURPOSE:To increase a temperature difference between a solution in a regeneratior and a heat source, and a temperature difference between a refrigerant in a condenser and a cooling source and hence improve heat efficiency and miniaturize an apparatus by mounting an impeller, etc., with a motor on a communication passage between the regenerator and condenser of an absorption freezer. CONSTITUTION:A regenerator 1 is constructed such that a heat transfer pipe 4a is provided therein and a solution spreader 3 is provided on the upper portion of the heat transfer pipe 4a, while a condenser 2 is constructed such that a heat transfer pipe 4b is provided therein. An impeller (or compressor) 12 driven by a motor is provided on the communication passage between the regenerator 1 and the condenser 2, whereby a vapor produced upon a diluted solution being concentrated by a heat source fluid in the regenerator 1 is increased in its pressure by the impeller 12 and directed to flow into the side of the condenser 2. In the condenser 2, the refrigerant vapor is cooled, condensed and liquefied by the cooling source fluid into a refrigerant fluid. Hereby, heat transfer areas of the regenerator 1 and the condenser 2 are reduced to miniaturize the absorption freezer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and more particularly to a refrigerator.
The present invention relates to an absorption refrigerating machine that utilizes cold heat generated by a refrigerant when a solution is concentrated by a heat source and the concentrated solution is diluted.

[0002]

2. Description of the Related Art In the prior art, the regenerator and the condenser have almost the same pressure. The steam heated by the regenerator flows into the condenser due to a slight differential pressure difference, and the heat is taken by the cooling water to condense and become a refrigerant. The internal pressure at this time is controlled by the temperature of the cooling source.

Further, the evaporator and the absorber have almost the same pressure. The vapor that took away the heat of the source to be cooled in the evaporator flowed into the absorber due to the slight differential pressure difference, and was absorbed in the solution.
The internal pressure at this time is governed by the temperature of the cooling source and the concentration of the solution.

As a related device, a catalog No.
There is an absorption refrigerator described in "MR-341X, 1990.5" and "Hitachi Cold / Hot Water Unit Koala".

[0005]

In the above technique, in order to downsize the regenerator, the condenser, the evaporator, and the absorber, it is considered that the heat transfer performance of the heat transfer tube is improved and the concentration of the solution is increased. However, although the former is possible to some extent, it is not possible to expect a significant reduction in size. Further, the latter has a problem of crystal, and this also has a limit.

In the above technique, in order to lower the heating source temperature of the regenerator, raise the cooling water temperature of the condenser and absorber, and lower the temperature of the cooled source of the evaporator, It is possible to improve the heat transfer performance of the heat pipe and the heat transfer area. However, although the former is possible to some extent, it cannot be expected to improve significantly. In addition, the latter has a limit because of the increase in size and the increase in cost.

The object of the present invention is to provide an impeller driven by a compressor or an electric motor in the communication passage between the regenerator and the condenser so that the temperature difference between the solution and the heating source can be increased in the regenerator and the condenser can be used in the condenser. The temperature difference between the refrigerant and the cooling source will be large, and the size will be reduced.

Further, an object of the present invention is to provide an impeller driven by a compressor or an electric motor in the communication passage between the evaporator and the absorber so that the temperature difference between the solution and the cooling source can be increased in the absorber. The evaporator is designed to reduce the temperature difference between the refrigerant and the source to be cooled, thereby reducing the size.

Another object of the present invention is to provide an impeller, which is driven by a compressor or an electric motor, in the communication passage between the regenerator and the condenser, so that the temperature difference between the solution and the heating source can be made large in the regenerator, and the temperature of the heating source can be increased. In addition to lowering the temperature, the condenser has a large temperature difference between the refrigerant and the cooling source to increase the temperature of the cooling source.

Another object of the present invention is to provide an impeller, which is driven by a compressor or an electric motor, in the communication passage between the evaporator and the absorber so that the temperature difference between the solution and the cooling source can be made large in the absorber and the cooling source The temperature difference between the refrigerant and the cooled source is increased by the evaporator, and the temperature of the cooled source is lowered.

[0011]

In order to solve the above problems, the present invention forcibly regenerates a regenerator by providing an impeller driven by a compressor or an electric motor in the communication passage between the regenerator and the condenser. Decrease pressure and increase condenser pressure. By doing so, the temperature difference between the solution and the heating source is made large by the regenerator, and the temperature difference between the refrigerant and the cooling source is made large by the condenser, and the size is reduced.

In order to solve the above-mentioned problems, the present invention forcibly reduces the pressure of the evaporator by providing an impeller driven by a compressor or an electric motor in the communication passage between the evaporator and the absorber. , And increase the absorber pressure. By doing so, the temperature difference between the solution and the cooling source is made large by the absorber, and the temperature difference between the refrigerant and the cooled source is made large by the evaporator, so that the size can be reduced.

In order to solve the above problems, the present invention forcibly reduces the pressure of the regenerator by providing an impeller driven by a compressor or an electric motor in the communication passage between the regenerator and the condenser. , And increase the pressure in the condenser. By doing so, the temperature difference between the solution and the heating source can be made large in the regenerator, and the temperature difference between the refrigerant and the cooling source can be made large in the condenser to lower the heating source temperature and increase the cooling source temperature. I chose

In order to solve the above problems, the present invention forcibly reduces the pressure of the evaporator by providing an impeller driven by a compressor or an electric motor in the communication passage between the evaporator and the absorber. , And increase the absorber pressure. By doing so, the temperature difference between the solution and the cooling source is made large by the absorber, the temperature difference between the refrigerant and the cooled source is made large by the evaporator, and the temperature of the cooling source is increased, and the low temperature of the cooled source is increased. I tried to make it.

[0015]

In the regenerator, the solution is concentrated to the concentration of the concentrated solution, which corresponds to the solution saturation temperature determined by the balance among the internal pressure, the heating source temperature, the heat exchange amount and the heat transfer area, and vapor is generated. At this time, the pressure of the regenerator is forcibly reduced by the impeller driven by the compressor or electric motor provided in the communication passage between the regenerator and the condenser, so the heat transfer area must be small to obtain the same solution saturation temperature. do it. In other words, while the amount of heat exchanged is constant, the temperature difference between the solution saturation temperature and the heating source temperature is made large and the heat transfer area is made small.

In the condenser, the steam generated in the regenerator is condensed at a steam saturation temperature determined by the balance between the internal pressure, the cooling source temperature, the amount of heat exchanged and the heat transfer area to become a refrigerant. At this time, the pressure of the condenser is forcibly increased by the impeller that is driven by the compressor or electric motor provided in the communication passage between the regenerator and the condenser, so the heat transfer area must be small to obtain the same vapor saturation temperature. do it. In other words, the amount of heat exchanged remains constant, and the temperature difference between the steam saturation temperature and the cooling source temperature is made large and the heat transfer area is made small.

In the absorber, the solution is diluted to the concentration of the dilute solution corresponding to the solution saturation temperature determined by the balance between the internal pressure, the cooling source temperature, the heat exchange amount and the heat transfer area, and absorbs the vapor. At this time, the impeller driven by a compressor or an electric motor provided in the communication path between the evaporator and the absorber forcibly raises the pressure of the absorber, so the heat transfer area must be small to obtain the same solution saturation temperature. do it. In other words, the amount of heat exchanged remains constant, and the temperature difference between the solution saturation temperature and the cooling source temperature is increased to reduce the heat transfer area.

In the evaporator, the refrigerant scattered on the heat transfer tubes evaporates at a steam saturation temperature determined by the balance between the internal pressure, the temperature of the source to be cooled, the amount of heat exchanged, and the heat transfer area to become steam. At this time, the impeller driven by a compressor or an electric motor provided in the communication passage between the evaporator and the absorber forcibly reduces the pressure in the evaporator, so the heat transfer area must be small to obtain the same vapor saturation temperature. do it. In other words, the amount of heat exchanged remains constant, and the temperature difference between the vapor saturation temperature and the temperature of the source to be cooled is increased to reduce the heat transfer area.

In the regenerator, the solution is concentrated to the concentration of the concentrated solution corresponding to the solution saturation temperature determined by the balance between the internal pressure, the heat source temperature, the amount of heat exchange and the heat transfer area, and vapor is generated. At this time, the pressure of the regenerator is forcibly reduced by the impeller driven by the compressor or electric motor provided in the communication passage between the regenerator and the condenser, so the heating source temperature must be reduced to obtain the same solution saturation temperature. You can do it. In other words, the heating source temperature is lowered while the exchange heat amount, the heat transfer area, the solution saturation temperature, and the temperature difference between the heating source temperature remain constant.

In the condenser, the steam generated in the regenerator is condensed at the steam saturation temperature determined by the balance between the internal pressure, the cooling source temperature, the exchange heat quantity and the heat transfer area to become a refrigerant. At this time, the pressure of the condenser is forcibly increased by the impeller driven by the compressor or electric motor provided in the communication passage between the regenerator and the condenser, so the temperature of the cooling source must be increased to obtain the same vapor saturation temperature. You can do it. That is, the cooling source temperature is increased while the exchange heat quantity, the heat transfer area, the vapor saturation temperature and the temperature difference of the cooling source temperature are constant.

In the absorber, the solution is diluted to the concentration of the dilute solution corresponding to the solution saturation temperature determined by the balance between the pressure inside the vessel, the temperature of the cooling source, the amount of heat exchanged and the heat transfer area, and absorbs the vapor. At this time, the impeller driven by a compressor or an electric motor provided in the communication passage between the evaporator and the absorber forcibly raises the pressure of the absorber, so the temperature of the cooling source must be raised to obtain the same solution saturation temperature. You can do it. That is, the temperature of the cooling source is increased while the temperature difference between the heat exchange amount, the heat transfer area, the solution saturation temperature and the cooling source temperature remains constant.

In the evaporator, the refrigerant scattered on the heat transfer tubes is vaporized at a vapor saturation temperature determined by the balance between the internal pressure, the temperature of the source to be cooled, the amount of heat exchanged, and the heat transfer area to become vapor. At this time, the pressure of the evaporator is forcibly lowered by the impeller driven by the compressor or electric motor provided in the communication passage between the evaporator and the absorber, so the temperature of the source to be cooled must be adjusted to obtain the same vapor saturation temperature. You can lower it. That is, the temperature of the cooled source is lowered while the temperature difference between the heat exchange amount, the heat transfer area, the steam saturation temperature and the cooled source temperature remains constant.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a structural diagram of the regenerator and condenser of the present invention. FIG. 2 is a Duhring diagram during operation of the regenerator and condenser of the present invention. The regenerator 1 includes a regenerator heat transfer tube 4a provided inside, a solution spray header 3 installed at an upper part of the regenerator heat transfer tube 4a, and a solution outlet 8 provided at a lower part. Condenser 2
Is composed of a condenser heat transfer tube 4b provided inside and a refrigerant outlet 11 provided below. An impeller or compressor 12 driven by an electric motor is provided in the communication passage between the regenerator 1 and the condenser 2.

While the heating source fluid is being introduced from the heating source fluid inlet 5, the dilute solution is introduced from the solution inlet 7 to the solution spray header 3
The diluted solution is sprayed onto the regenerator heat transfer tube 4a. The dilute solution is heated by the heating source fluid to generate steam, and the dilute solution is concentrated and changed into a concentrated solution. The concentrated concentrated solution exits from the solution outlet 8. The heat source fluid is deprived of heat to lower its temperature and flows out from the heat source fluid outlet 6. The generated steam is
By an impeller or compressor 12 driven by an electric motor,
It is pressurized and flows into the condenser 2 (inlet steam 13, outlet steam 14). On the other hand, the cooling source fluid is flowing in the condenser heat transfer tube 4b, and the vapor is deprived of heat by the cooling source fluid to be condensed and liquefied to become the refrigerant liquid, which flows out from the refrigerant outlet 11. The temperature of the cooling source fluid rises and flows out from the cooling source fluid outlet 10.

This will be described with reference to FIG. Solution inlet 7 in FIG.
1 corresponds to the solution (dilute) saturation point 19 before reaction, and the state of the solution outlet 8 after concentration in FIG. 1 corresponds to the solution (concentration) saturation point 20 after reaction. Heat source fluid inlet 5 of FIG. 1 at this time
Corresponds to the inlet heating source fluid 17, and the heating source fluid outlet 6 of FIG. 1 corresponds to the outlet heating source fluid 18. The steam generated here is boosted by the impeller or compressor and enters the condenser.
The lift of the impeller or compressor driven by an electric motor and the pressure boosted by the compressor corresponds to the lift 31 of the impeller or compressor. At this time, the condensate of the refrigerant and the refrigerant outlet 11 of FIG.
The state of corresponds to the refrigerant saturation point 27. The cooling source inlet 9 for condensing and liquefying this vapor in FIG. 1 corresponds to the inlet cooling source fluid 25, and the cooling source fluid outlet 10 in FIG. 1 corresponds to the outlet cooling source fluid 26. If there is no impeller or compressor due to the electric motor, the pressure difference between the regenerator side and the condenser side will not occur, so the pre-reaction solution (rare) saturation point and post-reaction solution (concentration) saturation point will not occur. 2 is a solution (dilute) saturation point 21 before reaction when the invention is not applied and a solution (dense) saturation point 22 after reaction when the invention is not applied, and the refrigerant saturation point is the invention in FIG. This is the refrigerant saturation point 28 when not applied. As can be seen from the above, by applying the present invention, the temperature difference between the post-reaction solution (concentrated) on the regenerator side and the outlet heating source fluid is 23 in FIG. 2 compared to 24 in FIG. 2 when not applied. And become bigger. Further, the temperature difference between the refrigerant on the condenser side and the cooling source outlet fluid is 3 in FIG. 2 when not applied.
It becomes 29 in FIG. 2 and becomes larger than 0.

A second embodiment of the present invention will be described below with reference to FIG.
And FIG. 4 will be described.

FIG. 3 is a structural diagram of the diluter and evaporator of the present invention. FIG. 4 is a Duhring diagram during operation of the diluter and the evaporator of the present invention. The diluter 32 includes a diluter heat transfer tube 35a provided inside, a solution spray header 34 installed on the upper part of the diluter heat transfer tube 35a, and a solution outlet 39 provided on the lower part.
The evaporator 33 includes an evaporator heat transfer tube 35b provided therein, a refrigerant spray header 40 installed above the evaporator heat transfer tube 35b,
It consists of a refrigerant outlet 42 provided at the bottom. An impeller or compressor 45 driven by an electric motor is provided in a communication passage between the diluter 32 and the evaporator 33.

The cooling source fluid is introduced from the cooling source fluid inlet 43, the refrigerant is introduced from the refrigerant inlet 41, and the refrigerant liquid is sprayed from the refrigerant spray header 40 onto the evaporator heat transfer tube 35b. The refrigerant liquid deprives the heat of the cooled source fluid to evaporate, and the cooled source fluid is deprived of the heat to lower the temperature and flows out from the cooled source fluid outlet 44. The generated steam is pressurized by an impeller or compressor 45 driven by an electric motor and flows into the diluter 32 (inlet steam 46, outlet steam 47). On the other hand, in the diluter 32, the cooling source fluid is introduced from the cooling source fluid inlet 36,
A concentrated solution is added from the solution inlet 38 to the solution spray header 34.
The concentrated solution is sprayed onto the diluter heat transfer tube 35a. The concentrated solution absorbs the inflowing vapor and is diluted to be a diluted solution. The diluted diluted solution exits from the solution outlet 39. The cooling source fluid takes away the reaction heat at this time to raise the temperature and flows out from the cooling source fluid outlet 37.

This will be described with reference to FIG. Solution inlet 3 in FIG.
The state of No. 8 corresponds to the pre-reaction solution (concentrated) saturation point 53, and
The state of the solution outlet 39 after dilution corresponds to the post-reaction solution (rare) saturation point 54. At this time, the cooling source fluid inlet 36 of FIG. 3 corresponds to the inlet cooling source fluid 51, and the cooling source fluid outlet 37 of FIG. 3 corresponds to the outlet cooling source fluid 52. The steam generated here is boosted by the impeller or compressor driven by the electric motor and enters the condenser, but the lift due to the boosting pressure by the impeller or the compressor driven by the electric motor is:
It corresponds to the impeller or compressor head 41. Figure 3 at this time
The state of the refrigerant liquid and the refrigerant outlet 42 scattered on the evaporator heat transfer tube 35b corresponds to the refrigerant saturation point 61. The cooled source inlet 43 in FIG. 3 corresponds to the inlet cooled source fluid 59, and the cooled source fluid outlet 44 in FIG. 3 corresponds to the outlet cooled source fluid 60. Here, if there is no impeller or compressor driven by an electric motor, there will be no pressure difference between the head of the diluter and the head of the evaporator, so the pre-reaction solution (concentration) saturation point and post-reaction solution (rare) The saturation point is the solution (concentrated) saturation point 55 before reaction when the invention is not applied in FIG. 4, and the solution (rare) saturation point 56 after reaction when the invention is not applied, and the refrigerant saturation point is shown in FIG. This is the refrigerant saturation point 62 when the invention is not applied. By applying the present invention, the temperature difference between the post-reaction solution (rare) on the diluter side and the outlet cooling source fluid becomes 57 in FIG. 4 and becomes larger than 58 in FIG. 4 when not applied. . Further, the temperature difference between the refrigerant on the evaporator side and the outlet fluid of the cooled source is 6 in FIG. 4 compared to 64 in FIG. 4 when not applied.
It becomes 3 and becomes big.

As another embodiment, a compressor or an impeller driven by an electric motor is attached to the communication passage between the regenerator and the condenser of the absorption refrigerator and the communication passage between the evaporator and the absorber, and the regeneration is performed by this. The temperature difference between the solution and the heating source is increased by the condenser, the temperature difference between the refrigerant and the cooling source is increased by the condenser, and the temperature difference between the solution and the cooling source is increased by the absorber. Therefore, the temperature difference between the refrigerant and the source to be cooled may be large. This is an example in which the above two embodiments are combined.

As another embodiment, an impeller driven by a compressor or an electric motor is attached to the communication passage between the regenerator and the condenser of the absorption chiller, whereby the regenerator
The temperature of the heating source can be lowered, and the temperature of the cooling source can be raised by the condenser. It will be described below with reference to FIG.

It is assumed that the heat transfer areas of the regenerator and the condenser are the same before and after the invention is applied. First, focusing on the regenerator side, since the heat transfer area is the same, the temperature difference between the solution (concentrated) after reaction and the outlet heating source fluid is 24 before application of the invention and 23 after application of the invention.
By applying the present invention, the temperatures of both the inlet heating source fluid 17 and the outlet heating source fluid 18 are reduced by applying the present invention. Next, focusing on the condenser side, since the heat transfer area is the same, the temperature difference between the refrigerant and the cooling source outlet fluid is the same 30 before the invention is applied and 29 after the invention is applied. The temperatures of both the inlet cooling source fluid 25 and the outlet cooling source fluid 26 are higher than those before application.

As another embodiment, an impeller driven by a compressor or an electric motor is attached to the communication passage between the evaporator and the absorber of the absorption refrigerator, whereby the absorber is
The temperature of the cooling source may be raised and the temperature of the cooled source may be lowered in the evaporator. This will be described below with reference to FIG.

It is assumed that the heat transfer areas of the evaporator and the absorber are the same before and after the invention is applied. First, focusing on the absorber side, since the heat transfer area is the same, the temperature difference between the solution (rare) after reaction and the outlet cooling source fluid is 58 before application of the invention and 57 after application.
However, by applying the present invention, the temperatures of both the inlet cooling source fluid 51 and the outlet cooling source fluid 52 rise compared with before applying the invention. Next, focusing on the evaporator side, since the heat transfer area is the same, the temperature difference between the refrigerant and the cooled source outlet fluid is
64 before application of the invention is the same as 63 after application of the invention, and by applying the present invention, both the inlet cooled source fluid 59 and the outlet cooling source fluid 60 have higher temperatures than before applying the invention.

As another embodiment, an impeller driven by a compressor or an electric motor is attached to the communication passage between the regenerator and the condenser of the absorption refrigerator and the communication passage between the evaporator and the absorber, and the regeneration is performed by this. The temperature of the heating source can be lowered by the condenser, the temperature of the cooling source can be raised by the condenser, and the temperature of the cooling source can be raised by the absorber, and the temperature of the cooled source can be lowered by the evaporator. There is a thing. This is an example in which the above two embodiments are combined.

[0037]

According to the present invention, the heat transfer area of the regenerator, condenser, diluter, and evaporator can be reduced. This has the effect of reducing the size of the absorption refrigerator.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a regenerator and a condenser of an absorption refrigerator according to the present invention.

FIG. 2 is a Duhring diagram of the regenerator and condenser of the absorption refrigerator according to the present invention.

FIG. 3 is an explanatory view of a diluter and an evaporator of the absorption refrigerator according to the present invention.

FIG. 4 is a Duhring diagram of a diluter and an evaporator of the absorption refrigerator according to the present invention.

[Explanation of symbols]

1 ... Regenerator, 2 ... Condenser, 3 ... Solution spray header, 4a
Regenerator heat transfer tube, 4b Condenser heat transfer tube, 5 Heat source fluid inlet, 6 Heat source fluid outlet, 7 Solution inlet, 8 Solution outlet, 9 Cooling source fluid inlet, 10 Cooling source fluid outlet , 11
... Refrigerant outlet, 12 ... Impeller or compressor driven by electric motor, 13 ... Inlet steam, 14 ... Outlet steam.

Claims (1)

[Claims] 1. An impeller driven by a compressor or an electric motor is attached to a communication passage between a regenerator and a condenser of an absorption chiller, whereby a large temperature difference between a solution and a heating source is ensured in the regenerator. A refrigerator having a large temperature difference between the refrigerant and the cooling source in the condenser.