JPH0451740B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a heat pipe type heat storage water tank device,
In particular, a heat siphon type heat exchanger is submerged in water as a heat transfer body, and the working fluid of the heat siphon is condensed in a pipe placed above the heat siphon during ice storage, and when hot water storage is performed, the heat siphon type heat exchanger is submerged in water. By evaporating the working fluid of the heat siphon in the pipe at the bottom of the heat siphon, ice heat storage for cooling (latent heat utilization) and hot water heat storage for heating (sensible heat heat storage) can be efficiently performed in one heat storage water tank. This invention relates to a heat pipe type heat storage water tank device.

[Conventional technology]

In air conditioning systems for heating and cooling, as a conventional heat storage water tank device that utilizes the latent heat or sensible heat of water,
For example, a method in which hot water obtained by another means or brine cooled to below 0°C is flowed through a metal or plastic pipe placed in a heat storage water tank;
There are known methods such as using a metal pipe placed in a heat storage water tank as a condenser or evaporator of a refrigeration cycle and flowing a refrigerant directly into the pipe, and using a heat pipe as a heat transfer medium. FIG. 3 is an example showing the method of among the above methods.
This figure shows a device that stores ice heat using a heat pipe. The advantage of the heat pipe type ice thermal storage water tank device is that heat transfer efficiency is high due to the isothermal nature of the heat pipe. Water 2 in the heat storage tank 1 is circulated through a pump 5 and a load 6, and a plurality of heat pipes 7 are vertically inserted into the heat storage tank 1.
A sealed space 8 containing a part of the heat pipe 7 is provided in the upper part thereof. This closed space 8 includes a compressor 9a and a heat exchanger (condenser) 9.
b, corresponds to the evaporator of the refrigeration cycle 9 configured by the expansion valve 9c and the pipe 9d. The refrigerant 11 for the refrigeration cycle, such as fluorocarbon, blown in from the nozzle 10 evaporates around the heat pipe 7 and is recovered from the recovery port 12 . By adjusting the temperature of the refrigerant 11 for the refrigeration cycle to below 0°C, the water 2 in the heat storage water tank 1 is frozen from the part that comes in contact with the heat pipe 7, and the unfrozen part of the water 2 that remains around is pumped by the pump 5. is circulated and carried to the load 6, and cold heat is supplied to the load 6. Further, in the heat pipe type heat storage water tank device described above, the heat exchanger 9b is used as an evaporator, the sealed space 8 is used as a condenser, and the heat of condensation of the refrigerant 11 for the refrigeration cycle is transferred to the water 2 via the heat pipe 7 to warm it. As a result, it can be used as a heat pump type hot water thermal storage tank device.

In this way, JP-A-60-78237 discloses that in one heat storage water tank, by switching the refrigeration cycle 9, ice heat storage for cooling (latent heat utilization) and hot water heat storage for heating (sensible heat heat storage), in other words, cooling is performed. It also shows an air conditioning system that provides heating. This air conditioning system that combines ice cold storage and hot water heating combines a heat pump with the above-mentioned refrigeration cycle 9 and uses a four-way switching valve as a means to switch between the refrigeration cycles 9. This makes the equipment more compact. and cost reduction. Further, by arranging the closed space 8 in FIG. 3 within the water 2 of the heat storage water tank 1, loss in heat transfer is eliminated.

[Problem that the invention seeks to solve]

However, according to conventional heat pipe type heat storage water tank devices, heat exchange between the heat pipe and the refrigerant is performed at the top of the heat pipe, and when storing hot water for heating, it becomes a so-called top heat mode. There is the disadvantage that thermal efficiency is reduced, and furthermore, the heat pipe must have a high-performance heat transfer surface that can be used in top heat mode, resulting in an increase in cost. For this reason, conventional heat pipe type heat storage water tank devices are often used exclusively for ice heat storage, and there is a problem in that they are not sufficiently complete for both cooling and heating purposes.

[Means for solving problems]

The present invention has been made in view of the above, and efficiently stores ice heat for cooling (using latent heat) and hot water for heating (sensible heat storage) in one heat storage water tank.
In addition, in order to reduce costs, a heat siphon type heat exchanger was submerged in water as a heat transfer body.
During ice storage, refrigerant such as fluorocarbons is evaporated in the pipe installed above the lid heat siphon, the pipe surface is cooled, and the working fluid of the heat siphon is condensed to freeze the water. During heat storage, the refrigerant is condensed in a pipe passing through the working fluid at the bottom of the heat siphon, heating the surface of the pipe, and evaporating the working fluid of the heat siphon to heat water. The present invention provides an aquarium device.

Hereinafter, the heat pipe type heat storage water tank device of the present invention will be explained in detail.

〔Example〕

1a, b and 2 show an embodiment of the present invention, which includes a heat storage water tank 1 filled with heat transfer water 2, a heat siphon type heat exchanger 3 submerged in the heat storage water tank 1, and FIG. , a compressor 4a, a heat exchanger 4b (operates as a condenser during ice storage and as an evaporator during hot water storage), an expansion valve 4c, and piping 4d.

As shown in the cross-sectional view of FIG. 1b, the heat siphon heat exchanger 3 includes an upper sheath tube 3b having an upper heat exchanger tube 3a therein, a lower sheath tube 3d having a lower heat exchanger tube 3c therein, A plurality of heat exchange tubes 3e connecting the upper sheath tube 3b and the lower sheath tube 3d constitute one sealed space, and a working fluid 3f (liquid and vapor) such as fluorocarbon is sealed in the sealed space. There is.

In the above configuration, the operation during ice heat storage and the operation during hot water heat storage will be explained using FIGS. 1a and 2b and FIG. 2, respectively.

Operation during Ice Heat Storage During ice heat storage, the refrigeration cycle 4 consisting of the compressor 4a, heat exchanger 4b (in this case operates as a condenser), expansion valve 4c, and piping 4d is connected to the piping as shown in Fig. 1a. and is connected to the upper heat exchanger tube 3a of the heat siphon type heat exchanger 3. At this time, the upper heat exchanger tube 3
a operates as an evaporator of the refrigeration cycle 4. On the other hand, the lower heat exchanger tube 3c is closed by a closing means (not shown) and separated from the refrigeration cycle 4. In this state, the refrigerant gas that has been compressed and heated to a high temperature by the compressor 4a of the refrigeration cycle 4 is guided to the heat exchanger 4b, where it comes into contact with the atmosphere, is cooled by heat radiation, and is condensed. This condensed refrigerant gas is sent to the upper heat transfer tube 3a of the heat siphon heat exchanger 3 via the expansion valve 4c. At this time, the upper heat exchanger tube 3a acts as an evaporator, and the refrigerant gas is transferred to the upper heat exchanger tube 3a.
It evaporates by taking the heat of vaporization from the surface. On the other hand, the working fluid 3f evaporated by the heat of the water 2 exchanges heat around the upper heat transfer tube 3a and the upper sheath tube 3b and condenses. Further, as the temperature of the upper sheath tube 3b decreases, the water 2 condenses around the upper sheath tube 3b to generate ice, and furthermore, ice is generated around the heat exchange tube 3e.

Operation during hot water heat storage During hot water heat storage, the refrigeration cycle 4 consisting of the compressor 4a, heat exchanger 4b (in this case, operates as an evaporator), expansion valve 4c, and piping 4d is piped as shown in FIG. , is connected to the lower heat transfer tube 3c of the heat siphon type heat exchanger 3. At this time, the lower heat exchanger tube 3c operates as a condenser of the refrigeration cycle 4. On the other hand, the upper heat exchanger tube 3a is closed by a closing means (not shown) and separated from the refrigeration cycle 4. In this state, the refrigerant gas is compressed by the compressor 4a of the refrigeration cycle 4, sent to the lower heat transfer tube 3c and condensed, and the heat of condensation evaporates the working fluid 3f sealed in the lower sheath tube 3d. . This working fluid 3f
is cooled and condensed by the water 2 in the heat exchange tube 3e, and the water 2 is heated by the heat of condensation at this time. At this time, since the lower heat exchanger tube 3c (heat supply source) is located below the heat exchange tube 3e, the bottom heat mode is set and heat exchange in the heat siphon type heat exchanger 3 is performed efficiently.

In this embodiment, the refrigeration cycle 4 is composed of a compressor 4a, a heat exchanger 4b, an expansion valve 4c, and a pipe 4d, but there is no particular limitation as long as it performs the same functions. Furthermore, instead of supplying the refrigerant by the refrigeration cycle 4, brine or the like heated to a predetermined temperature may be supplied. Piping switching during ice heat storage and hot water heat storage may be performed by providing a pipe switching means. A plurality of heat siphon type heat exchangers 3 may act in series or in parallel depending on the size of the heat storage water tank 1.
It is also possible to use the lower heat exchanger tubes 3a, 3c in a horizontal state with the entire structure tilted.

Both the upper heat exchanger tube 3a and the lower heat exchanger tube 3c condense or evaporate the working fluid 3f on their outer surfaces, and further effects can be expected by applying high-performance heat transfer surface processing. In addition, when using each as an evaporator or a condenser in the refrigeration cycle 4, fine spiral grooves are processed on the inner surface.
It is desirable to improve the internal heat transfer rate. Similarly, it is desirable to use a pipe that improves the heat transfer coefficient between the water 2 on the outer surface and the working fluid 3f for the heat exchange pipe 3e.

〔Effect of the invention〕

As explained above, according to the heat pipe type heat storage water tank device of the present invention, a heat siphon type heat exchanger is submerged in water as a heat transfer body, and during ice heat storage, a pipe is placed above the heat siphon type heat exchanger. Refrigerant such as chlorofluorocarbons is evaporated inside, cooling the pipe surface, and condensing the working fluid of the heat siphon to freeze the water. Also, when hot water is storing heat, it passes through the working fluid at the bottom of the heat siphon. The water is heated by condensing the refrigerant in the pipe, heating the pipe surface, and evaporating the working fluid of the heat siphon, which enables ice heat storage for cooling (uses latent heat) and hot water heat storage for heating (sensible heat heat storage). ) can be performed efficiently with one heat storage water tank, and it is possible to reduce costs.

[Brief explanation of the drawing]

FIG. 1a is an explanatory diagram showing a state during ice heat storage according to an embodiment of the present invention. FIG. 1b is a sectional view of FIG. 1a. FIG. 2 is an explanatory diagram showing a state during hot water heat storage according to the present invention.
FIG. 3 is an explanatory diagram showing a conventional heat pipe type heat storage water tank device. Explanation of symbols, 1... Heat storage water tank, 2... Water, 3...
...Heat siphon type heat exchanger, 3a... Upper heat exchanger tube, 3b... Upper sheath tube, 3c... Lower heat exchanger tube,
3d... lower sheath tube, 3e... heat exchange tube, 3f...
Working fluid, 4... Refrigeration cycle, 4a... Compressor, 4b... Heat exchanger, 4c... Expansion valve, 4d
……Piping.

Claims (1)

[Scope of Claims] 1. A heat storage tank device that utilizes sensible heat and/or latent heat of water in a heat storage tank, which is provided under water in the heat storage tank, pools a working fluid in the lower part, and stores its steam in the upper part. an upper heat transfer tube that passes through the upper part of the airtight container and passes through the steam; a lower heat transfer tube that passes through the lower part of the airtight container and passes through the working fluid; and ice heat storage. A refrigeration cycle means is sometimes connected to the upper heat exchanger tube, and during hot water heat storage is connected to the lower heat exchanger tube, and during ice heat storage, brine at a temperature of 0° C. or lower is flowed to the upper heat exchanger tube, or the refrigeration cycle is connected to the upper heat exchanger tube. An evaporator is configured to flow a refrigerant through a heat transfer tube to evaporate at a temperature below 0°C, and when storing hot water, a heat medium at a predetermined temperature is flowed into the lower heat transfer tube, or a refrigerant is flowed from the refrigeration cycle means to operate a condenser. A heat pipe type heat storage water tank device characterized by comprising: