JP2012072935A - Heat storage device and air conditioner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat storage device preventing the evaporation of a heat storage material and hardly corroding a heat exchanger.SOLUTION: The heat storage device 20 includes a heat storage vessel 23 containing the heat storage material 24 and an oil layer 26 layered on the upper part of the heat storage material 24, and the heat exchanger 25 disposed to be dipped in the heat storage material 24 in the heat storage vessel 23. The oil layer 26 has two or more kinds of hydrocarbon with pour points different from one another as principal components, and a fractional distillation boiling point of at least one kind of the hydrocarbon is higher than the boiling point of the heat storage material.

Description

  The present invention relates to a heat storage device that recovers heat stored in a heat storage material containing water using a heat exchanger, and an air conditioner using the same.

  Water is often used as a heat storage material because it has a large heat storage capacity and is low in price, but in order to prevent freezing at low temperatures, water is stored as a mixture of non-freezing dihydric alcohols such as ethylene glycol. Generally used as a material. However, since the boiling point of this heat storage material is a little over 100 ° C. and easily evaporates, there has been a problem that the mixed solution must be replenished periodically. In order to solve this problem, a method of suppressing evaporation of the heat storage material with an oil film formed on the heat storage material has been proposed (see, for example, Patent Document 1).

  FIG. 6A is a cross-sectional view of a conventional heat storage device. In FIG. 6A, the heat storage device 10 includes a container constituted by a metal heat storage tank 1 and a lid 2. A heat storage material 3 containing water as a main component and containing 30% ethylene glycol is accommodated in the internal space of the container, thereby preventing freezing at low temperatures. Further, in the heat storage device 10, a large number of heat radiation heat exchangers 4 and heat absorption heat exchangers 5 are arranged in the inner space of the container so as to be immersed in the heat storage material 3. The heat storage material 3 stores heat released from the heat storage heater 6 and the heat exchanger 4 for heat dissipation provided outside the container. The heat storage thus obtained is recovered by the heat absorption heat exchanger 5 and transmitted to a refrigerant (not shown) flowing through the internal space. The refrigerant having reached a high temperature is used to improve the heating start-up characteristics of a refrigeration cycle (not shown).

  Further, an oil film 7 having a thickness of about 3 mm is formed on the surface of the heat storage material 3 to suppress a decrease in the heat storage material 3 due to evaporation. Further, in order to prevent the steam generated from the heat storage material 3 from excessively increasing the internal pressure of the container and from being excessively released into the atmosphere, the lid 2 has a vapor having a minute opening area. Suppression means 8 (for example, an opening or the like) is provided. In addition to this, an oil film is used to prevent a part of the heat storage material 3 from overflowing outside the container via the steam suppression means 8 due to active molecular motion due to an excessive rise in water temperature. An air layer 9 is provided between 7 and the lid 2.

  FIG. 6B is a diagram illustrating an example in which the heat storage device 10 of FIG. 6A is applied to an air conditioner. 6B, the air conditioner includes an indoor unit 11 in which a condenser is arranged, an expansion valve (not shown), an outdoor unit 12 in which an evaporator is arranged, and a compressor 13, and these are used as a heat pump for heating. Is configured. Further, a bypass flow path 14 having an endothermic heat exchanger 5 is provided in the downstream of the indoor unit 11 and the upstream of the compressor 13 so that the refrigerant flows by opening the two-way valve 15. It has become.

  The refrigerant that has become high temperature and high pressure by the compressor 13 is radiated by the heat radiating heat exchanger 4, and the radiated heat is stored in the heat storage material 3 in the heat storage device 10. The heat storage material 3 is further heated by a heat storage heater 6 provided in the heat storage device 10 to be heated to 93 to 97 ° C. As a result, heat is accumulated in the heat storage device 10. The heat storage heats the refrigerant flowing by opening the two-way valve 15 via the heat absorption heat exchanger 5, and the warmed refrigerant flows to the compressor 13. This hot refrigerant finally flows to the indoor unit 11 in which the condenser is arranged, where heat is exchanged to obtain a warm air for heating.

Japanese Patent Laid-Open No. 10-288359

  In the conventional heat storage device, it is unclear what kind of oil film 7 is used. For example, when an organic silicone oil is used as the oil film 7, since this organic silicone is slightly dissolved in water, the evaporation suppressing ability of the heat storage material 3 gradually decreases, and the heat storage material 3 eventually evaporates. That is, when organic silicone is used, there is a problem that the heat storage capacity of the heat storage device 10 decreases with time. In addition, since organic acids such as formic acid and / or acetic acid are produced by hydrolysis, the problem of corroding the heat-dissipating heat exchanger 4 and the heat-absorbing heat exchanger 5 immersed in the heat storage material 3 is also in the organic silicone. .

  Therefore, an object of the present invention is to provide a heat storage device that suppresses evaporation of the heat storage material and eliminates replenishment of the heat storage material as much as possible, and an air conditioner using the same.

In order to achieve the above object, the present invention comprises a container that houses a heat storage material and an oil layer that is laminated on top of the heat storage material, and a heat exchanger that is arranged to be immersed in the heat storage material in the container,
The oil layer is mainly composed of two or more kinds of hydrocarbons having different pour points, and the boiling point of at least one kind of hydrocarbon is larger than the boiling point of the heat storage material.

  The oil layer contains hydrocarbons whose boiling point is higher than the boiling point of the heat storage solution. Therefore, the oil layer is difficult to dissolve in water and does not easily evaporate, thus suppressing evaporation of the heat storage solution and making replenishment unnecessary.

Sectional drawing of the thermal storage apparatus which concerns on Embodiment 1 of this invention The figure which shows the property relationship of the thermal storage material and oil layer which are shown to FIG. 1A Diagram showing characteristics of various combinations of heat storage material and oil reservoir The figure which shows the examination result of the anti-corrosion property of the heat exchanger with respect to the kind and characteristic of the heat storage material The figure when the cross section of the heat storage apparatus which concerns on Embodiment 6 of this invention is seen from upper direction The longitudinal cross-sectional view of the thermal storage apparatus which concerns on Embodiment 6 of this invention The figure which shows the structure of the air conditioner using the heat storage apparatus which concerns on this invention. Vertical section of a conventional heat storage device The figure which shows the example which applied the thermal storage apparatus of FIG. 6A to the air conditioner

  The present invention includes a container that houses a heat storage material and an oil layer stacked on top of the heat storage material, and a heat exchanger that is arranged to be immersed in the heat storage material in the container, and the oil layers have different pour points. The main component is two or more kinds of hydrocarbons, and the boiling point of at least one kind of hydrocarbon is larger than the boiling point of the heat storage material.

  Since the oil layer is mainly composed of hydrocarbons whose boiling point is higher than that of the heat storage solution, the oil layer hardly dissolves in water and does not easily evaporate, thereby suppressing evaporation of the heat storage solution and making it unnecessary to replenish. In addition, since the oil layer is mainly composed of hydrocarbons, it is difficult to produce organic acids such as formic acid and / or acetic acid by hydrolysis, and the amount thereof is smaller than that of the heat storage solution below the heat storage material. The amount of organic acid eluted in the heat exchanger becomes very small and corrosion of the heat exchanger hardly occurs.

Specifically, the hydrocarbon is a saturated hydrocarbon. The heat storage material is mainly composed of a mixed liquid of water and antifreezing dihydric alcohol. The oil layer is a first oil layer that is liquid at room temperature,
It comprises a first oil layer and a second oil layer having a different specific gravity. Thereby, it becomes a favorable oil layer with all the suppression capability of thermal storage solution volatilization, the solubility to the thermal storage solution of oil, and the suppression capability of organic acid production | generation.

  Specifically, the flash point (Fahrenheit temperature) of the oil layer is 1.3 times higher than the boiling point (Fahrenheit temperature) of the heat storage material. Thereby, it is possible to form an oil layer that is more excellent in liquidity at room temperature, ability to suppress volatilization of the heat storage solution, solubility of oil in the heat storage solution, and ability to suppress organic acid generation.

  Preferably, the heat exchanger is a copper-based material and the heat storage material is an aqueous solution of PH6-10.

  Moreover, the said container has the cover part which has a recessed part, and the box part which the said cover part fits, The lower end of the said recessed part is immersed in the thermal storage material or the oil film, It is characterized by the above-mentioned. According to this configuration, the heat exchanger is not exposed to air, and corrosion that occurs due to contact between air and water does not occur.

  Moreover, the heat storage apparatus of this invention can be utilized for an air conditioner.

(Embodiment 1)
1A is a cross-sectional view of the heat storage device according to Embodiment 1 of the present invention, and FIG. 1B is a diagram showing the property relationship between the heat storage material and the oil layer shown in FIG. 1A. In FIG. 1A, the heat storage device 20 includes a heat storage container 23 including a box portion 21 and a lid portion 22, a heat storage material 24 filled in the internal space of the heat storage container 23, and a heat exchanger 25 immersed in the heat storage material 24. And at least. The heat storage material 24 is a solution mainly composed of a mixed solution of water and antifreezing dihydric alcohol, and on the upper part thereof, two kinds of trace amounts of oil layers 26a mainly composed of saturated hydrocarbons and having different molecular weights are provided. 26b is formed.

  The lid portion 22 is provided with a vent hole 27 communicating with the atmosphere. The opening area of the vent hole 27 is optimized to prevent the internal pressure of the heat storage container 23 from increasing due to the temperature increase of the heat storage material 24 and the oil layer 26. Specifically, the rising pressure is appropriately released into the atmosphere via the vent hole 27, and the pressure is excessively released, so that the filling amount of the heat storage material 24 and the oil layer 26 is prevented from being reduced. Thus, the opening area is optimized. Further, a gap 28 made of an air layer is provided between the oil layer 26 and the lid portion 22 so that the pressure can be released smoothly.

  There are two types of heat storage to the heat storage material 24 in the heat storage device 20 and its recovery method. One is a method of using the heat exchanger 25 as a heat radiation source. Specifically, heat of the heat medium is released to the heat storage material 24 while a heat medium such as hot water or a warm refrigerant flows in from the inlet 29 of the heat exchanger 25 and flows out of the outlet 30. The released heat is accumulated in the heat storage material 24. The first method stores heat in this way. On the other hand, the collection method is as follows. A separate heat exchanger (not shown) is attached to the heat exchanger 25 to flow tap water or a cold refrigerant. A cold refrigerant is supplied to the other heat exchanger, and heat is recovered from the heat storage material 24.

  Other heat storage and recovery methods are as follows. That is, it is a method in which a new heat exchanger (not shown) or a heating source (not shown) through which a heat medium flows is provided side by side outside or inside the heat storage container 23. A heat exchanger 25 in which tap water or cold refrigerant flows from the inlet 29 to collect heat from the heat source to the heat storage material 24 collects heat from the heat storage material 24, and the recovered heat is connected to the outlet 30. Communicate to equipment (not shown).

  Hereinafter, the specific manufacturing method of the thermal storage container 23 is demonstrated. First, the box part 21 and the cover part 22 of the heat storage container 23 are obtained by molding with PPS resin (polyphenylene sulfide resin). Next, a heat exchanger 25 made of a copper serpentine tube was placed in the internal space of the box portion 21, and a heat storage material 24 mainly composed of a mixture of ethylene glycol or propylene glycol mixed with water was injected. Thereafter, oil is injected into the heat storage material 24 to form a small amount of oil layer 26 on the heat storage material 24, and finally, a lid portion 22 having a vent hole 27 is stacked and fitted on the box portion 21 to store heat. The container 23 is completed.

  Next, the heat storage material 24 will be described in detail. Ethylene glycol has a boiling point of 198 ° C. and a freezing temperature of −13 ° C., and propylene glycol has a boiling point of 187 ° C. and a freezing temperature of −59 ° C., both of which are non-freezing dihydric alcohols. These antifreeze dihydric alcohol and water are mixed in an arbitrary ratio, and an azole (for example, benzotriazole, mercaptobenzotriazole, tolyltriazole, etc.) which is a copper rust preventive agent, and PH is 6 to 11, more preferably Various heat storage materials 24 were obtained by further mixing with PH adjusters (sodium carbonate, sodium silicate, etc.) for adjusting the pH to 7-10. For example, a mixed solution of ethylene glycol 85% and water 15% has a boiling point of 130 ° C. and a freezing temperature of −43 ° C., and a mixed solution of ethylene glycol 30% and water 70% has a boiling point of 103 ° C. and a freezing temperature of −15. It becomes ℃. On the other hand, a mixed solution of 85% propylene glycol and 15% water has a boiling point of 120 ° C and a freezing temperature of -53 ° C, and a mixed solution of propylene glycol 30% and water 70% has a boiling point of 102 ° C and a freezing temperature of -15. It becomes ℃. When these physical properties are summarized, the prepared heat storage material 24 becomes a solution having a boiling point of 102 to 130 ° C. and a freezing temperature of −53 to −15 ° C. Therefore, the following four types were used as the typical heat storage material 24, and the following examination was performed.

  As shown in FIG. 1B, oil having a boiling point higher than the boiling point of the heat storage material 24 is injected into the representative four types of heat storage materials 24, and a small amount of oil layer 26 is formed on the top to evaluate the characteristics. . The result is shown in FIG.

  As shown in FIG. 2, nine types of oils having different hydrocarbon types, carbon numbers, starting temperatures, and fraction boiling points are used, and each of them is used as a comparative example (a), (b), ( c), named as the present invention (1), (2), (3), (4), (5), (6). Characteristic evaluation measures liquidity at normal temperature (specified as 5 to 35 ° C. according to Japanese Industrial Standards), ability to suppress volatilization of heat storage material, solubility of oil in heat storage material, ability to suppress organic acid generation, and measured value According to the ranking, it is classified into five levels: “Excellent”, “Relatively excellent”, “Good”, “Insufficient”, “Extremely inferior”, and “◎”, “◎ to ○”, “○”, “△”, “×” "". In particular, regarding the three characteristics (the ability to suppress volatilization of the heat storage material, the solubility of oil in the heat storage material, and the ability to suppress organic acid generation), “Excellent ◎” can be used even at a water temperature of 100 ° C. “Excellent ◎ to ○” can be used at a water temperature of 80 ° C., “Good ○” can be used at a water temperature of 60 ° C., “Extremely inferior ×” can be used at a water temperature of 60 ° C. or lower, but cannot be used at higher temperatures. It was said that.

  Furthermore, as a result of evaluating the volatilization amount of the heat storage material by combining the oil layer 26 with two or more types of oil layers 26a and 26b having different pour points, the maximum volatility is 1/10 or less compared to the case where the oil layer 26 is a single oil layer 26. A decrease in the amount was confirmed.

  In the present invention (1), (2), (3), (4), (5), (6), an oil mainly composed of saturated hydrocarbon is used, and this oil has two different pour points. Even if the oil layer 26 is formed as an oil layer 26, all the characteristics are “excellent”, “relatively excellent” to “good”, and “good”, so that the oil can be used at a water temperature of 60 ° C.

  In addition, the same effect was acquired even if the dihydric alcohol which has antifreezing property (antifreezing dihydric alcohol) has a boiling point of 244 degreeC and freezing temperature of -10 degreeC.

(Embodiment 2)
In the second embodiment, the type of optimum combination of the antifreeze dihydric alcohol used in the heat storage material 24 and the saturated hydrocarbon used in the oil layer 26 is examined.

  As described in the present invention (1), (2), (3), (4), (5), (6) in FIG. 2, the heat storage material 24 is ethylene glycol or propylene glycol as an antifreeze dihydric alcohol. As the oil layer 26, for example, the saturated hydrocarbon which is solid at room temperature of the present invention (1) and any of the present invention (2), (3), (4), (5), (6), etc. The oil layers 26a and 26b were formed by combining with oil having liquidity at room temperature. When two types of oil layers having different pour points are formed in this way, unlike the oil layers 26a and 26b, each formed of liquid oil at room temperature, a solid oil layer 26a is formed on the heat storage material 24 at room temperature. A liquid oil layer 26b is formed on the oil layer 26a. Such formation of the oil layer can also be realized by selecting two types of oil layers having different specific gravities. As a result, the heat storage material volatilization suppression ability, the solubility of oil in the heat storage material, and the organic acid production suppression ability are all “excellent”, “relatively excellent”, “good”, and a water temperature of 60 ° C. This was a good oil that could be used. As described above, since the ability to suppress volatilization of the heat storage material is good, a heat storage device with a low frequency of replenishment of the heat storage material is obtained.

(Embodiment 3)
In the third embodiment, the optimum relationship between the evaporability of the heat storage material 24 and the evaporability of the saturated hydrocarbon used in the oil layer 26 was examined. As a result of the examination, the evaporability of the heat storage material 24 is replaced by the boiling point, and the evaporability of the saturated hydrocarbon used in the oil layer 26 is replaced by the flash point (see FIG. 1B). The oil layer 26 is found to be an excellent oil when its flash point (Fahrenheit temperature) is at a high temperature 1.3 times the boiling point (Fahrenheit temperature) of the heat storage material 24, and as a result, A heat storage device with low replenishment frequency of the heat storage material was obtained. Hereinafter, the details of the study will be described.

  Even if the liquid is a liquid at room temperature, a part of the liquid is vaporized as a vapor, and the higher the temperature, the higher the evaporability. Volatilized vapor has a pressure that is in equilibrium with the liquid at each temperature, and this pressure is called vapor pressure. For example, the vapor pressure of water is 23 hPa at 20 ° C., 575 hPa at 80 ° C., and 1013 hPa at 100 ° C., and the higher the temperature of any liquid, the higher the vapor pressure. The boiling point is a temperature at which the vapor pressure in the liquid state becomes equal to the pressure of the surrounding gas. In the case of water, the boiling point is 100 ° C. at 1 atmosphere (1013 hPa).

  The same applies to the saturated hydrocarbon used in the oil layer 26. The higher the temperature, the more hydrocarbons evaporate and the vapor pressure increases. However, if the amount of evaporation increases, there is a new problem of ignition. Will occur. Inflammation is a phenomenon in which when a liquid hydrocarbon is heated at a certain temperature and a flame is brought close to it, the hydrocarbon instantly burns and a new fire is created there. The lowest temperature at which a concentration of vapor is generated is called the flash point. The flash point is generally used as a measure of evaporability and vapor pressure. Generally, the higher the flash point temperature, the more difficult it is to evaporate and the lower the vapor pressure at the same temperature.

  The relationship between the flash point, vapor pressure, and boiling point will be described using the saturated hydrocarbon paraffin (carbon number C15) used in the oil layer 26 of the present invention (6) as an example. Paraffin (carbon number C15) is pentadecane (C15H32), and has a melting point (flow start temperature) of 10 ° C., a flash point of 132 ° C., and a boiling point of 270 ° C. The vapor pressure is 1 hPa at 92 ° C., 10 hPa at a flash point of 132 ° C., and 1013 hPa at a boiling point of 270 ° C. It can be seen that the higher the temperature, the larger the vapor pressure and the easier the hydrocarbons evaporate.

  The saturated hydrocarbon used in the oil layer 26 of the present invention (5) is a mineral oil having C20 to C20. Compared with the paraffin (carbon number C15) of the present invention (6), this mineral oil has a molecular structure having a large number of carbon atoms but a large number of side chains, so that the melting point (flow start temperature) is -12 ° C. The liquidity in normal temperature (5-35 degreeC) is ensured by this. Further, the mineral oil of the present invention (5) has a flash point of 169 ° C., which is higher than the 132 ° C. of the paraffin (carbon number C15) of the present invention (6). . In addition, this means that the vapor pressure at the same temperature is smaller in the mineral oil of the present invention (5) than in the paraffin (carbon number C15) of the present invention (6).

  In this way, the flash point is greatly related to the difficulty of evaporation of hydrocarbons, meaning that the higher the temperature, the more difficult the hydrocarbons evaporate. The higher the carbon number of the hydrocarbon, the higher the flash point. Becomes hot and difficult to evaporate. In addition, the boiling point has a similar tendency. The larger the number of carbon atoms in the hydrocarbon, the higher the boiling point and the less the evaporation.

  Therefore, the evaporability of the heat storage material 24 was replaced with the boiling point, and the evaporability of the saturated hydrocarbon used in the oil layer 26 was replaced with the flash point, and the relationship between the two was examined. As described in FIG. 2, the heat storage material 24 is a solution having a boiling point of 102 to 130 ° C. The oil layer 26 of the present invention (5) has a flash point of 132 ° C., which is substantially the same as the highest boiling point 130 ° C. of the heat storage material 24, and therefore, both characteristics are “good”.

  On the other hand, the oil layer 26 of the present invention (5) has a flash point of 169 ° C. and 1.3 times higher than the maximum boiling point of 130 ° C. of the heat storage material 24. ○ ”. Further, the oil layer 26 of the present invention (2), (3), (4) has a flash point of 290 ° C. or 250 ° C., further 240 ° C., 2.23 times or 1 with respect to the maximum boiling point 130 ° C. Since it is as high as .92 times and further 1.85 times, any characteristic and “excellent” are obtained.

  Thus, when the oil layer 26 has a flash point (Fahrenheit temperature) that is at least 1.3 times higher than the boiling point (Fahrenheit temperature) of the heat storage material 24, the liquidity at room temperature and the ability to suppress volatilization of the heat storage material. In addition, both the solubility of oil in heat storage materials and the ability to suppress the formation of organic acids have been dramatically improved to “relatively excellent ◎ to ○” and “excellent ◎”, and can be used even at a water temperature of 80 ° C. or higher. Become. In particular, when the oil layer 26 has a flash point (Fahrenheit temperature) that is 1.85 times or more higher than the boiling point (Fahrenheit temperature) of the heat storage material 24, both characteristics are “excellent” and even at a water temperature of 100 ° C. It becomes an even better oil that can be used.

(Embodiment 4)
In the fourth embodiment, when a copper-based material is used as the heat exchanger 25, the liquid property of the heat storage material 24 exhibiting good corrosion resistance is examined.

The above-mentioned representative four kinds of heat storage materials 24 are mixed with an antifreeze dihydric alcohol such as ethylene glycol or propylene glycol and water in an azole (for example, benzotriazole, mercaptobenzotriazole, copper rust inhibitor). And a PH adjuster (sodium carbonate, sodium silicate, etc.) are further mixed to adjust the pH to 6-10. Therefore, the corrosion resistance of copper when the heat exchanger 25, which is a copper-based material, was immersed in these heat storage materials 24 at 60 ° C. for a predetermined period was evaluated for each PH.
The examination result is shown in FIG. The evaluation measures the concentration of the eluted copper ions, and ranks the copper corrosion resistance according to the measured values in four stages: “excellent”, “good”, “insufficient”, “extremely inferior”. It is expressed by the symbols “◎”, “○”, “△”, “×”

The present invention I to IV of PH 6 to 10 mixed with an azole which is a copper rust preventive agent has an excellent corrosion resistance of copper and an excellent oil for copper corrosion resistance. is there. PH7 ~
Invention Nos. 10 to 10 of the present invention are oils that are particularly excellent in copper corrosion resistance and that have excellent copper corrosion resistance. As a result, a higher quality heat storage device having a lower frequency of replenishment of the heat storage material was obtained. On the other hand, as in Comparative Examples II and III, a heat storage material having an azole content of less than PH6 or more than PH10 is an unqualified oil because the corrosion resistance of copper becomes “insufficient Δ”. Further, as in Comparative Examples I and IV, a PH6 or PH10 heat storage material in which no azole is mixed is an ineligible oil because the corrosion resistance of copper is “extremely poor”.

(Embodiment 5)
The fifth embodiment relates to the detailed structure of the heat storage device 20.

  As shown in FIG. 1, the lid portion 22 has a concave portion 31, that is, a portion 31 having a substantially U-shaped longitudinal section. The heat exchanger 25 passes through the bottom 32 of the recess 31 and is fixed at the bottom 32. Further, as described in the first embodiment, the lid portion 22 is fitted with the box portion 21 that houses the heat exchanger 25 to constitute the heat storage container 23.

  The upper oil level of the oil layer 26 reaches the lower end of the bottom portion 32. However, the upper oil surface of the oil layer 26 does not reach the lid portion 22 except the bottom portion 32, and an air gap (air layer) 28 is formed in the upper space. By doing so, most of the heat exchanger 25 is always immersed in the heat storage material 24. In other words, the heat exchanger 25 is not exposed to the air layer 28 in the heat storage container 23. Note that the heat storage material 24 may reach the lower end of the bottom portion 32. By adopting such a configuration, the heat exchanger 25 is not exposed to air, so that the corrosion that occurs due to the contact of air and water does not occur, and the advantage that the corrosion resistance can be improved is obtained. .

(Embodiment 6)
The sixth embodiment relates to the structure of the heat storage device 20 that can effectively store the waste heat of the heating source in the heat storage material. The structure will be described below with reference to FIGS. 4A and 4B.

  FIG. 4A is a view of the cross section of the heat storage device according to Embodiment 6 of the present invention when viewed from above. FIG. 4B is a longitudinal sectional view of the heat storage device. 4B shows a cut surface of the AB line in FIG. 4A, and FIG. 4A shows a cut surface of the CD line in FIG. 4B.

  4A and 4B, the heat storage device 20 is configured such that a part of the container wall constituting the box portion 21 is a thin plate 34 containing a corrosion-resistant metal foil, and the thin plate 34 has a compressor, an electric heater, a heat exchanger, or the like. The heat source 35 is brought into contact with the heat source 35 so that the waste heat can be effectively stored in the heat storage material 24. Since the thin plate 34 has a structure in which a stainless steel foil alone or a resin thin film such as a PPS resin (polyphenylene sulfide resin) is laminated on both sides or one side thereof, a heat storage device capable of more effectively storing waste heat can be obtained. It was.

(Embodiment 7)
The seventh embodiment relates to the structure of the heat storage device 20 that can effectively store the waste heat of the heating source in the heat storage material. Hereinafter, the structure will be described with reference to FIGS. 4A and 4B.

  4A and 4B, the heat storage device 20 is configured such that a part of the side surface of the box portion 21 is a thin plate 34, and the thin plate 34 covers a part of the heating source 35 (compressor or the like), and the waste heat is stored. The material 24 can be stored more effectively.

(Embodiment 8)
Embodiment 8 relates to an air conditioner that performs heating effectively by applying a heat storage device to a heating flow path of a heat pump. The configuration will be described below with reference to FIG.

  In FIG. 5, in the case of heating, a heat pump type air conditioner connects a condenser 40, an expansion valve 41, an evaporator 42, and a compressor 43 in order by piping, and a heating heat pump circulation path 44 through which refrigerant flows. Is an air conditioner configured to obtain hot air with a condenser 40 disposed indoors. The compressor 43 has a motor for continuously compressing the refrigerant into a high-temperature and high-pressure gas in the compression chamber, and requires a large amount of power to operate the motor, and thus serves as a heating source that generates heat. Yes. In this air conditioner, the heat storage device 20 described in the above-described embodiment is provided around the compressor 43, and the generated heat is supplied to the heat storage material 24 through the thin plate 34 that is a part of the constituent members. The heat was stored. With this configuration, the heat of the compressor 43 stored in the heat storage material 24 is recovered by the heat exchanger 25 and is used for heating the refrigerant flowing in the heat exchanger 25.

  First, the flow of a normal refrigerant when the air conditioner performs heating will be described. The refrigerant gas compressed by the compressor 43 and having a high temperature and a high pressure is sent to the condenser 40, where the high-temperature refrigerant heat exchanges heat with air in the condenser 40 and dissipates the heat into the room as warm air. Medium temperature and high pressure liquid. Thereafter, the medium-temperature and high-pressure liquid refrigerant is sent to the expansion valve 41 via the heating heat pump circuit 44, where it expands to become a low-temperature and low-pressure liquid refrigerant and is sent to the evaporator 42. The low-temperature refrigerant heat exchanges heat with air in the evaporator 42, dissipates the cold heat to the outside as cold air, and is sent to the compressor 43 as medium-temperature high-pressure gas. The high-temperature and high-pressure refrigerant gas compressed by the compressor 43 is sent again to the condenser 40 and thereafter repeats the above flow.

  Next, a configuration in which the heat of the compressor 43 is recovered by the heat exchanger 25 and used to heat the refrigerant, and the recovered heat is used to defrost the evaporator 42 will be described. In order to perform this heat storage defrosting, this air conditioner has a configuration in which two bypass refrigerant flow paths and three valves related to the refrigerant flow paths are provided in the heating heat pump circulation path 44. One bypass refrigerant flow path is a heat storage bypass path 45 that bypasses and connects the downstream flow of the condenser 40 and the upstream flow of the compressor 43, and an electromagnetic valve (for heat storage recovery path) 46 is connected to the flow path 45. Arranged. The other bypass refrigerant flow path is a defrost bypass path 47 that bypasses and connects the downstream flow of the compressor 43 and the upstream flow of the evaporator 42. The flow path 47 includes an electromagnetic valve (for the defrost path). 48), a four-way valve 49 is arranged in the heating heat pump circuit 44.

  A refrigerant flow for performing heat storage and recovery will be described. The medium temperature / high pressure liquid refrigerant sent from the condenser 40 is introduced into the heat exchanger 25 disposed in the heat storage device 20 via the heat storage bypass passage 45 when the electromagnetic valve (for the heat storage recovery passage) 46 is operated. Is done. And the heat | fever of the compressor 43 collect | recovered with the heat exchanger 25, and the refrigerant | coolant which temperature rose is sent to the compressor 43, is compressed, and also temperature rises. Next, the flow of defrosting will be described. The solenoid valve (for defrosting) 48 and the four-way valve 49 are operated, and the temperature-increased refrigerant sent from the compressor 43 flows into the evaporator 42 via the defrosting bypass path 47 and adheres thereto. Used to defrost frost. Thereafter, the refrigerant that has passed through the evaporator 42 flows directly to the condenser 40 via the four-way valve 49. Note that the solenoid valve (for heat storage and recovery path) 46, the solenoid valve (for defrost path) 48, and the four-way valve 49 are not limited to the locations shown in FIG. 5, and are optimally capable of performing their roles. The optimal number of places is arranged.

  The above-described heat storage recovery and defrosting in which the refrigerant flows through the heat storage bypass passage 45 and the defrosting bypass passage 47 is performed when the frost adheres to the evaporator 42 during the heating operation or in the cold morning, and the attached frost is defrosted. Due to this configuration and refrigerant flow, the air conditioner can be heated non-stop or in a short time even in cold mornings, and is always a comfortable heating device. At the same time, it becomes an energy-saving heating device.

The heat storage device of the present invention is a heat pump-type air conditioner that is always comfortable and energy-saving, an energy-saving hot-water supply device that keeps bath water warm, and energy-saving that stores heat generated by low-cost late-night electricity and uses it for morning heating. It can be used for a simple heating device.

DESCRIPTION OF SYMBOLS 20 Thermal storage apparatus 21 Box part 22 Lid part 23 Thermal storage container 24 Thermal storage material 25 Heat exchanger 26 Oil layer 27 Ventilation hole 28 Crevice (air layer)
31 Concave portion 32 Bottom portion 34 Thin plate 35 Heat source 40 Condenser 41 Expansion valve 42 Evaporator 43 Compressor 44 Heat pump circulation path 45 Heat storage bypass path 46 Solenoid valve (for heat storage recovery path)
47 Bypass path for defrosting 48 Solenoid valve (for defrosting path)
49 Four-way valve

Claims (12)

A heat storage device,
A container for storing a heat storage material and an oil layer laminated on top of the heat storage material;
A heat exchanger arranged to be immersed in the heat storage material in the container,
The oil layer is mainly composed of two or more kinds of hydrocarbons having different pour points, and the boiling point of at least one kind of hydrocarbon is larger than the boiling point of the heat storage material. The heat storage device according to claim 1, wherein the hydrocarbon is a saturated hydrocarbon. The said heat storage material is a heat storage apparatus of Claim 1 or 2 which has as a main component the liquid mixture of water and antifreezing dihydric alcohol. The heat storage device according to any one of claims 1 to 3, wherein the oil layer includes a first oil layer that is liquid at room temperature and a second oil layer having a specific gravity different from that of the first oil layer. 5. The heat storage device according to claim 1, wherein a flash point (Fahrenheit temperature) of the oil layer is 1.3 times higher than a boiling point (Fahrenheit temperature) of the heat storage material. The heat storage device according to any one of claims 1 to 5, wherein the heat exchanger is a copper-based material and is an aqueous solution having a pH of 6 to 10. The said heat exchanger is a heat exchanger for the thermal storage which collect | recovers the heat | fever stored in the thermal storage solution layer, The heat source which heats the said thermal storage solution was further provided in any one of Claims 1-6. Thermal storage device. The said heater is provided in the exterior of a thermal storage solution layer, and the heat exchanger for thermal storage is provided in the position immersed in the said thermal storage solution layer inside a thermal storage container, The Claim 1-7 characterized by the above-mentioned. The heat storage device according to any one of the above. The container includes a lid portion having a recess and a box portion into which the lid is fitted, and a lower end of the recess is immersed in the heat storage material or the oil layer. The heat storage device according to any one of 1 to 8. The heat storage device according to any one of claims 7 to 9, wherein the heat storage container is provided so as to surround a heating source. The said heat storage container is contacting the heating source via the heat conductive member, The heat storage apparatus of any one of Claims 7-10 characterized by the above-mentioned. An air conditioner comprising the heat storage device according to any one of claims 1 to 11.