JPH0257836A - Heat pipe type heat-storage water tank - Google Patents

Abstract

PURPOSE:To improve the heat-exchanging efficiency by providing condensed liquid drip protection parts around the external surface of an upper heat transfer tube above the inlets of heat exchange tubes, a working liquid drip guide parts each having a specified taper at the conjunction points of an upper sleeve pipe and the heat exchange tubes. CONSTITUTION:A heat siphon type heat exchanger 3 is submerged in heat carrier water 2, and condensed liquid drip protection parts 5 are provided around the external surface of an upper heat transfer tube 3a. The condensed liquid drip protection parts 5 are arranged above each of two or more inlets of heat transfer tube 3a, thereby condensed liquid 3g condensed above the inlets of the heat transfer tube 3a is dripped on the internal surface of a sleeve pipe 3b so that condensed liquid is prevented from directly dripping into a lower sleeve pipe 3d. Working liquid drip guides 6 are provided at the conjunction points of the upper sleeve pipe and heat exchange tubes 3e, and each furnished with a sloped plane having a slope of T/R >0.25 ; T indicates the length of taper, and R the inside diameter of the upper sleeve pipe 3b. The working liquid drip guides make the condensed liquid flow down along the internal surface of the heat exchange tubes through the tapered planes without being retained in the upper sleeve pipe.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat pipe type heat storage water tank device, and in particular, the present invention relates to a heat pipe type heat storage water tank device, and in particular, by supplying the condensed liquid generated from the upper heat exchanger tube to the wall surface of the heat exchange tube without waste, the heat exchange is improved. This invention relates to a heat pipe type heat storage water tank device with improved performance.

[Conventional technology]

In air conditioning systems for heating and cooling, conventional heat storage water tank devices that utilize the latent heat or sensible heat of water include, for example, heat pipe type heat storage water tank devices, which greatly improve heat transfer efficiency due to the isothermal nature of the heat pipes. . As shown in FIG. 4, this system has a totosiphon type heat exchanger 3 (not shown) submerged in water, and an upper heat transfer tube 3a in an upper sheath tube 3b disposed at the top during ice storage. The surface is cooled, and the working fluid 3f (steam in this case) in the upper sheath pipe 3b is condensed as shown by 3g, and as shown in FIG. to freeze. In addition, during hot water heat storage, the refrigerant is condensed in the lower heat transfer tube 3c in the lower sheath pipe 3d through which the lower working fluid 3f passes, thereby evaporating the working fluid 3r in the lower sheath pipe 3d, and allowing the evaporated working fluid 3f to pass through. The water in contact with the heat exchange tube 3e is heated. In this way, ice heat storage for cooling (use of latent heat) and hot water heat storage for heating (use of sensible heat) are efficiently performed by the heat siphon type heat exchanger of one heat storage water tank.

[Problem to be solved by the invention]

However, according to the conventional heat pipe type heat storage water tank device,
The upper heat exchanger tube 3a has a structure with smooth or continuous spiral grooves or protrusions, and when storing water for cooling, heat is exchanged into the liquid 3g condensed in the upper heat exchanger tube 3a, as shown in FIG. Some of them fell directly into the lower sheath tube 3d without contacting the wall surface of the tube 3e. For this reason, the condensed liquid 3g is accumulated in the lower sheath tube 3d without being heat exchanged by the heat exchange tube 3e, and the supply of the working fluid 3f from the lower sheath tube 3d to the heat exchange tube 3e is insufficient. , the liquid wettability of the inner surface of the heat exchange tube 3e decreases, and as shown in the figure, the heat exchange tube 3
8 The ice thickness 6 on the surface becomes non-uniform. For this reason, there was a problem in that the efficiency of the entire system was significantly reduced. This phenomenon becomes more pronounced as the heat exchange tube 3e becomes larger, and the influence of efficiency reduction due to direct drop also becomes greater. On the other hand, upper sheath tube 3
b and the heat exchange tube 3e have a nearly right-angled joint surface, and the condensed liquid 3g generated on the outer surface of the upper heat exchanger tube 3a stays in the upper sheath tube 3b, and as a result, the liquid film thickness increases and the upper sheath tube There was a problem that the evaporation performance of 3b deteriorated. Also, condensate 3
Since it was difficult for g to flow down from the upper sheath tube 3b to the inner wall of the heat exchange tube 3e, the internal heat transfer coefficient of the heat exchange tube 3e also tended to decrease. Furthermore, during hot water heat storage for heating, 3 g of condensate generated on the inner surface of the upper sheath tube 3b stays in the upper sheath tube 3b, increasing the liquid film and thickness of the upper sheath tube 3b, and reducing the condensation performance of the upper sheath tube 3b. Therefore, there was a problem in that the heating capacity of the entire system was also reduced.

Therefore, the object of the present invention is to provide a heat pipe type heat storage water tank device in which the condensed liquid generated from the upper heat exchanger tube does not drip directly onto the lower sheath tube, but falls along the inner wall surface of the heat exchange tube. It is to provide.

Another object of the present invention is to provide a heat pipe type heat storage water tank device in which condensed liquid easily flows down to the inner wall surface of the heat exchange tube without remaining in the upper sheath tube.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a condensate drip prevention section made of tape or a tube with notches on the outer surface of the upper heat exchanger tube just above the inlet of the heat exchanger tube, and as necessary, Provided is a heat pipe type heat storage water tank device in which a working fluid drip introduction part having a tapered surface with a ratio of taper length to upper sheath pipe inner diameter of 0.25 or more is provided at a joint position of a sheath pipe and a heat exchange pipe. .

That is, the heat pipe type heat storage water tank device of the present invention includes a closed container that is provided underwater in the heat storage tank and pools the working fluid in the lower part and stores the steam in the upper part; an upper heat transfer tube that is passed through the inside and has a condensate drip prevention part made of a tape or a tube with a notch, etc., and a lower heat transfer tube that passes through the lower part of the closed container and passes through the working fluid. , a refrigeration cycle means connected to the upper heat transfer tube during ice heat storage and connected to the lower heat transfer tube during hot water heat storage. The sealed container includes an upper sheath tube through which the upper heat exchanger tube passes, a lower sheath tube through which the lower heat exchanger tube passes,
and a plurality of heat exchange tubes arranged by connecting an upper sheath tube and a lower sheath tube, and the condensate drip prevention section made of the tape or a tube with a notch, etc. is located directly above the inlet of the heat exchange tube. A working fluid drip introducing portion having a tapered surface with a ratio of the taper length to the inner diameter of the upper sheath tube of 0.25 or more is provided at the joining position of the upper sheath tube and the heat exchange tube.

This working fluid drip introduction section allows the condensed fluid to easily flow down to the inner wall surface of the heat exchange tube via the tapered surface without remaining in the upper sheath tube.

In addition, the condensate drip prevention part prevents the condensate generated from the upper heat exchanger tube from directly falling into the lower sheath tube, and allows all the condensate to fall to the upper sheath tube and then flow to the heat exchange tube. There is. Such a heat pipe type heat storage water tank device is used for ice storage by flowing brine at 0°C or lower into the upper heat transfer tube, or by flowing a refrigerant from the refrigeration cycle means into the upper heat transfer tube to evaporate at a temperature below 0°C. configure the vessel,
During hot water heat storage, a heat medium at a predetermined temperature is passed through the lower heat transfer tube, or a refrigerant is passed from the refrigeration cycle means to form a condenser. It should be noted that when the above-mentioned ratio is less than 0.25, the slope becomes gentle and becomes close to the conventional right-angled shape, which reduces the effect of introducing the liquid. The aforementioned internal diameter then depends on the parameter of the amount of condensate.

〔Example〕

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

FIGS. 1(a), (bl) and FIG. 2 show an embodiment of the present invention, including a heat storage water tank 1 filled with heat transfer water 2, and a heat siphon type heat exchanger submerged in the heat storage water tank 1. container 3 and compressor 4a.

Heat exchanger (operates as a condenser when storing ice heat and as an evaporator when storing hot water heat) 4b.

It is composed of a refrigeration cycle 4 consisting of an expansion valve 4c and piping 4d.

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

(As will be described later in C1 and (d), a condensate drip prevention part 5 is located at a position directly above the inlet of the heat exchange tube 3e of the upper heat exchange tube 3a.
are provided, and an upper sheath pipe 3b and a heat exchange pipe 3 are provided.
A tapered working fluid drip introducing portion 6 is provided at the joining position e.

Figure 3 (al indicates water storage of 3 g of condensate generated from the totoichi siphon heat exchanger and upper heat exchanger tube 3a, and the dripping state of the condensate during heating; similarly, the same figure (bl indicates hot water heat storage). A condensate drip prevention portion 5 is provided on the outer surface of the upper heat transfer tube 3a of the heat siphon heat exchanger 3 submerged in the heat transfer water 2.Condensate dripping The prevention part 5 is arranged directly above the inlet of the plurality of heat transfer tubes 3a, and thereby causes the condensate 3g condensed directly above the inlet of the heat transfer tube 3a to drip onto the inner surface of the upper sheath tube 3b and into the lower sheath tube 3d. It prevents it from falling directly.The structure is as follows:
A tape-shaped or plate-shaped one (Fig. 3 (C1), or one in which a notch 5a is provided in the tube 5 (Fig. 3 (d)), etc. is suitable, but it is not limited to this. , a working fluid drip introduction part 6 having a tapered surface with a ratio T/R of taper length T and inner diameter R of the upper sheath tube 3b of 0.25 or more is provided at the joining position of the upper sheath tube 3b and the heat exchange tube 3e. In the same figure (al 7 shows ice generated by heat exchange.

In the above configuration, (1) operation during ice heat storage and (2) operation during hot water heat storage are shown in Figures 1(a) and (bl), respectively.

This will be explained using FIG. 2, FIGS. 3(a) and 3(b), and fcl.

■Operation during ice heat storage During ice heat storage, compressor 4a, heat exchange tube 4b
(in this case acts as a capacitor), expansion valve 4
The refrigeration cycle 4 consisting of the c + and the piping 4d is
It is piped as shown in Figure (a) and connected to the upper heat exchanger tube 3a of the heat siphon heat exchanger λ. At this time, the upper heat exchanger tube 3a 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 compressor 4a of the refrigeration cycle 4
The refrigerant gas, which has been compressed to a high temperature, is led to the heat exchange tube 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 type 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 takes vaporization heat from the surface of the upper heat exchanger tube 3a and evaporates. On the other hand, the working fluid 3 evaporated due to the heat of the water 2
f performs heat exchange around the upper heat exchanger tube 3a and the upper sheath tube 3b and is condensed. At this time, the condensed liquid 3g that has condensed around the upper heat exchanger tube 3a falls as droplets, but just above the inlet of the heat exchanger tube 3e, as shown in FIGS. The condensate drip prevention part 5 provided on the outer surface of the heat transfer tube 3a prevents the condensate from directly falling into the lower sheath tube 3d, and the condensate 3g is dripped into the upper sheath tube 3b.
All the condensate 3g is transferred from the upper heat exchanger tube 3a to the upper sheath tube 3b,
Since it flows into the heat exchange tube 3e, the liquid wettability of the inner surface of the heat exchange tube 3e is improved, and the evaporation performance of the heat exchange tube 3e is improved. Furthermore, the working fluid drip introduction part 6 provided at the joining position of the upper sheath tube 3b and the heat exchange tube 3e improves the flow of liquid from the upper sheath tube 3b to the heat exchange tube 3e, and the liquid in the upper sheath tube 3b is improved. The film layer is reduced, the evaporation performance of the upper sheath tube 3b is improved, and the liquid wettability of the heat exchange tube 3e is improved. Therefore, as shown in the figure, a more uniform ice layer 7 can be obtained, and the water tank 2
It is possible to increase the ice making rate in the ice making process. In other words,
Heat exchange in the heat siphon type heat exchanger 3 is performed efficiently.

■Operation during hot water heat storage During hot water heat storage, compressor 4a, heat exchange pipe 4b
(in this case, it operates as an evaporator), an expansion valve 4c, and piping 4d.
It is piped as shown in the figure and connected to the lower heat exchanger 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 sheath tube 3b is closed by a closing means (not shown) and separated from the refrigeration cycle 4. In this state, the refrigerant supplied from the refrigeration cycle 4 condenses in the lower heat transfer tube 3c, and the condensation causes the working fluid 3f to evaporate (
The evaporated gas 3h) is cooled with water 2 via the heat exchange tube 3e and the upper sheath tube 3b, and is condensed. In other words, the water 2 is heated via the heat exchange tube 3e and the upper sheath tube 3b.

The condensate 3g condensed in the upper sheath pipe 3b is shown in FIG.
As shown in FIG. 2, the working fluid easily flows into the inner surface of the heat exchange tube 3e through the drip introduction section 6, and is collected into the lower sheath tube 3d along the wall surface. This eliminates the retention of the condensate 3g in the upper sheath tube 3b, reduces the condensate film layer, and improves the condensation performance of the upper sheath tube 3b. As a result, heat exchange in the heat siphon type heat exchanger 3 is performed efficiently even during heating operation.

In this embodiment, the refrigeration cycle 4 is connected to the compressor 4.
a, a heat exchange pipe 4b, an expansion valve 4c, and a pipe 4d, but there is no particular limitation as long as it fulfills the same function.

Furthermore, instead of supplying the refrigerant by the refrigeration cycle 4, a prine or the like heated to a predetermined temperature may be supplied. Piping switching during ice heat storage and hot water heat storage can be easily performed by providing appropriate means. A plurality of heat siphon type heat exchangers 3 may be used in series or in parallel depending on the size of the heat storage water tank 1, and upper and lower heat exchanger tubes 3a,
It is also possible to use the device by tilting the entire device with 3c being horizontal.

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.

〔Effect of the invention〕

As explained above, according to the heat pipe type heat storage water tank device of the present invention, on the outer surface of the upper heat exchanger tube immediately above the inlet of the heat exchanger tube,
A condensate drip prevention part made of tape or a tube with notches, etc. is provided, and a tapered surface with a ratio of taper length to upper sheath tube inner diameter of 0.25 or more is provided at the joint position of the upper sheath tube and the heat exchange tube. By providing a working fluid drip introduction section, the condensed liquid generated from the upper heat exchanger tube does not drip directly onto the lower sheath tube, but instead falls along the inner wall surface of the heat exchange tube, making it possible to improve heat exchange efficiency. Furthermore, the condensed liquid could be easily allowed to flow down onto the inner wall surface of the heat exchange tube without being retained in the upper sheath tube, thereby improving the evaporation capacity of the upper sheath tube or the heat exchange tube. As a result of the above-mentioned effects, the ice making speed and ice making rate during cooling operation are significantly improved, and
Since the heating capacity during heating operation is improved, the entire device can be made more compact.

Furthermore, by improving the heat exchange efficiency and making it more compact, it is possible to achieve an economical heat pipe type heat storage water tank device.

[Brief explanation of the drawing]

FIG. 1(a) is an explanatory diagram showing a state during ice heat storage according to an embodiment of the present invention. FIG. 1fb) is a sectional view of FIG. 1(a). Second
The figure is an explanatory diagram showing a state during hot water heat storage according to the present invention. Figure 3 (
a) is an explanatory diagram showing the dripping state of condensate during ice heat storage according to the present invention; FIG. 3) is an explanatory view showing the dripping state of condensate during hot water heat storage according to the present invention. Figure 3 ((!l, (d) is a sectional view of the condensate drip prevention part, Figure 4 is an explanatory diagram showing the upper heat transfer tube of a conventional heat siphon type heat exchanger. Figure 5 is a diagram of the conventional heat siphon type heat exchanger. Explanatory diagram showing a siphon type heat exchanger. Explanation of symbols t ---m-・----m-Thermal 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 3 e−− −−−−−−・−・・Heat exchange tube 3f・−・−
・・−・−・Hydraulic fluid 3h−・・・・−・・Working fluid evaporative gas 4・−・−
...... Refrigeration cycle 4a ---1 --- Compressor 4b ---1 --- Heat exchanger 4 cm --- Expansion valve 4d ----1 --- Piping 5 --- Condensed liquid dripping prevention part 5a --- Notch 6 --- Working fluid drip introduction part 7 ---・－・Ice

Claims (2)

[Claims] (1) In a heat storage tank device that utilizes sensible heat and/or latent heat of water in a heat storage tank, a sealed container is provided in the water of the heat storage tank to pool the working fluid in the lower part and to store the steam in the upper part. , an upper heat transfer tube that penetrates the upper part of the sealed container and passes through the steam; a lower heat transfer tube that penetrates the lower part of the closed container and passes the working fluid; and during ice heat storage, the upper heat transfer tube A refrigeration cycle means connected to the heat pipe and connected to the lower heat exchanger tube during hot water heat storage, and flowing brine at 0° C. or lower to the upper heat exchanger tube during ice heat storage, or flowing brine from the refrigeration cycle means to the upper heat exchanger tube. An evaporator is configured to flow a refrigerant and evaporate at a temperature below 0° C., and a condenser is configured by flowing a heat medium at a predetermined temperature to the lower heat transfer tube when storing hot water, or by flowing a refrigerant from the refrigeration cycle means, The sealed container includes an upper sheath tube through which the upper heat exchanger tube passes, a lower sheath tube through which the lower heat exchanger tube passes, and a plurality of heat exchange tubes arranged to connect the upper sheath tube and the lower sheath tube. . A heat pipe type heat storage water tank device, characterized in that a condensate drip prevention section made of a tape or a notched tube is provided at a position directly above the inlet of the heat exchange tube. (2) The upper sheath tube and the heat exchange tube have a working fluid drip introduction portion formed at their joining position, the working fluid drip introducing portion having a tapered surface having a ratio of taper length to upper sheath tube inner diameter of 0.25 or more. The heat pipe type heat storage water tank device according to item 1.