JP2007225268A - Latent heat accumulator provided with heat exchanging function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a latent heat accumulation composition and a heat exchange type heat accumulator capable of making a tank and the accumulator, compact in size capable of regulating easily a heat accumulating capacity, and capable of increasing a unit heat accumulation amount. <P>SOLUTION: This latent heat accumulation composition is a composition comprising a sodium acetate hydrate of repeating heat sink/radiation within a range of 83 kcal/l of a required heat quantity at 57°C in the generation of entropy. This heat exchange type heat accumulator is one with sealed with a water flow pipe 2 having aluminum heat transfer blades (fins) 3 in a heat accumulation container 4 and the latent heat accumulation composition, and heat pumped up by a heat pump using inexpensive night electric power is accumulated through the water flow pipe 2 to be used for heating, air conditioning and hot-water supply. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a heat exchange type heat storage device for heating and hot water supply using a latent heat storage composition having a unit heat quantity of latent heat entering and exiting by phase change at a system specific melting point and having a melting point of 58.5 ° C. A heat storage device equipped with a high-efficiency heat exchange function that uses inexpensive nighttime electricity to store atmospheric heat energy in the heat storage device with a heat pump and supplies heat to the heating and hot water supply of houses and buildings when necessary obtain.

  Except for a large-scale hot water tank as a means for storing heat, conventionally, a metal or a synthetic resin such as FRP has been used. A heat pump that compresses a refrigerant that has absorbed atmospheric heat with ultra-high pressure and generates high-temperature water using the generated heat has been proposed and has been put to practical use in hot water supply and heating with a thermal efficiency (COP) that is more than three times the electric power. This method has the ability to produce high-temperature water near 90 ° C. as compared to the conventional method by using a selected natural medium, and improves hot water storage capacity by about 40% compared to hot water stored at 45 ° C. in hot water. However, it is known as a problem of high-temperature hot water storage that the temperature loss due to natural heat dissipation is reduced by about 0.5 ° C. per hour in the hot water storage tank where the temperature difference is large, especially in the case of an outdoor temperature of 0 ° C. If the hot water storage tank is fully extruded, the daily heat loss is affected by the temperature difference between the inside and outside, the surface area of the hot water tank and the contact area exposed to the outside air temperature, and the heat loss increases in proportion to the remaining hot water volume. Was. Under the condition of ambient temperature = feed water temperature = 10 ° C., it is known that the heat loss actually reaches 38.8% of the theoretical required amount of heat Kcal. However, the demand trend is multifunctional, and the demand for hot water increases, resulting in an increase in size, making it difficult to select an installation location. On the other hand, a heat pump that does not have a heat storage function has problems that are inconvenient in terms of performance, such as a time lag in temperature tracking at the stand-up.

Problems to be solved by the invention

  The latent heat storage material employed in the heat storage device of the present invention does not change the specific melting point of the substance, and when the temperature falls from the liquefied state to the temperature lower than the melting point, it dissipates the latent heat until the end of the entropy generation state, depending on the mass. Release and absorb energy. Moreover, at the time of melting, it retains the reversibility of the property of absorbing heat until the heat storage material (1) is completely liquefied. The system of the electrolytic hydration composition (1) used in the heat storage device is a unit when the specific gravity is 1.42 times the capacity of water, the ambient temperature is equal to the supply water temperature = 10 ° C, and the internal / external temperature difference is 10 ° C. The amount of heat is about three times that of water, and it has the advantage of being compact and having a large amount of heat. The quality of the water used in the heat exchange system eliminates the influence of contamination by other substances. That is, in the water pipe (2), contamination penetration can be prevented while maintaining a high pressure from the outside. Therefore, hygiene and physiological safety can be ensured. In addition, since the heat storage material (1) is carried on the tube blade support structure (3) mounted inside the apparatus, the contact area with the heat medium (2) is increased, the heat exchange rate is increased, and the unit heat flow rate is increased. As a result, the convenience and heat supply capacity of the heat pump are further improved. Also, heat loss due to surface area can be reduced by downsizing. Compared to the conventional hot water storage tank volume, it is reduced by about 45%, contributing to space and energy savings.

  The original original melting point of sodium acetate hydrate of the latent heat dissipating material (1) provided in the apparatus of the present invention is 58.5 ° C. It is compatible with the temperature range of equipment that has a heating capacity of 70 to 85 ° C with a compression heat pump, and is useful for heat storage devices for heating and hot water supply.

  The latent heat storage material (1) hydrate has a density ratio with water of 1.42 times or more, and ΔT10 ° C required heat amount and heat release amount is 1.6 times to 5.0 times larger. Miniaturization is possible. The heat storage material absorbs and melts and dissipates heat at the inherent melting point of the material, revealing the thermal reaction of solidification, and the heat absorption and heat dissipation maintain a large amount of heat storage and constant temperature until the reversible state change is completed. have. In the present invention, a hydrate of a system prepared by cooking independently was applied to a main material of a single or a mixed mixture. The theoretical value of the properties of the sodium acetate hydrate salt of the radiator is a melting point of 58.5 ° C. and a latent heat of 60 calories / gram. However, generally, the electrolyte hydrate (1) has a degree of difference, but the thermal conductivity of the solid is 0.35 m. k was not good.

As a means, the contact unit of the heat conduction surface area of the heat storage material (1) and the heat medium (2) can be expanded by changing the quantity of heat conduction blades (3) carried on the water pipe (2) per unit. It is solved by using means that can be reduced. That is, by using a method for reducing the surface resistance during the heat exchange of the system, the generation of entropy can be greatly shortened and the heat collection result can be improved. In addition, the heat storage composition adopts heat and rust prevention treatment and ionized corrosion prevention for the structure, ensuring the heat history function, stable maintenance of equipment, and has the features of space saving heat storage device.
Japanese Patent No. 2890197 Japanese Patent No. 2566445 JP-A-10-237433

Research Literature 4

Architectural Institute of Japan Academic Research Materials

Means for solving the problem

  Cu, AL, SUS, Fe in the water pipe of the part selected for the heat exchange container of the present invention, the metal blade (3) having good heat conduction material carried on the pipe (2), and the container containing the same It can be selected and used.

  The main material adopted is the sodium acetate hydrate system (1), and the latent heat storage composition (1) liquefies above its inherent melting point, below which it generates reversible entropy of solidification. The energy sent from the heat source and the load is transferred to the heat storage material from the heat conduction blade carried through the water pipe. That is, if the water flow temperature (2) is higher than the specific melting point of the heat storage composition, the heat storage composition (1) liquefies while absorbing heat, maintains the heat storage state, and becomes lower than the melting point temperature of the system, The amount of heat at the melting point of the substance is released by recombination of atoms, and the release of heat is completed with solidification (solidification). The latent heat that enters and exits the entropy generation process is used for heating and hot water supply. After heat dissipation, it can be used repeatedly by reheating.

  That is, heat enters and exits reversibly between the heat storage material (1) and the heat medium (2) via the heat storage blade (3) carried on the heat storage material (1) and the water flow pipe (2). And heat exchange for heat dissipation. If the unit contact area between the heat transfer blade (3) and the heat medium (2) and the heat storage material (1) is increased, the heat exchange speed can be increased to cope with the heat flow load. It effectively responds to hot water supply, heating and air conditioning.

The invention's effect

  In the present invention, a heat medium (running water) from a heat source is introduced into a heat storage container through a water pipe (2), and the water pipe carries a plurality of metal blades (3) having good heat conduction such as copper and aluminum ( (Hereinafter referred to as “tube blade support”) and the support (3) carrying the latent heat storage material (1) increases the contact area between the heat storage material (1) and the heat medium (2), thereby storing heat. / The heat exchange efficiency of heat dissipation is further improved through the latent heat storage part (1) that is present through the metal blade (3) carried on the water flow pipe that circulates the heat medium pumped by the heat pump using cheap nighttime power. The amount of heat storage per unit is increased by about 30% or more compared to the capsule heat storage exchange system, and space saving is promoted. For example, in a setting of an internal / external temperature difference ΔT20 ° C., a heat storage material with a volume of 100 l The amount of heat of 85 ° C high-temperature water for comparison between the amount of latent heat and the specific heat of water is 6,500 Kcal / Kl, while the amount of latent heat at 58 ° C of the system is 8,520 Kcal / Kl, The difference reaches about 2,000 Kcal / Kl.Also achieved the reduction of heat loss and energy saving due to space saving.The present invention not only facilitates maintenance and installation workability by combining small units (units), It has the features of compactness and large capacity, such as increase / decrease of required heat quantity and easy installation of divided parts, etc. The heat exchange performance of hot water supply / heat storage is supported by the heat storage material on the tube blade support (3). The temperature of the heat medium (2) hot water supply diversion and collection header (6) is controlled by the temperature sensor installed in the heating medium (2) to control the pump and electromagnetic regulating valve for efficient temperature management and supply of water supply and distribution Means to do In addition, multiple units can be used to double the functions, making it possible to utilize and respond to previously unused spaces such as under floors and attics during installation. By taking advantage of this, it is possible to prevent condensation and reduce heat loss in cold regions, and to have features for cold regions as a heat pump heat storage device.

  According to the flow direction of the water pipe (2) in the apparatus (4), the heat storage material (1) is filled in close contact with a plurality of heat transfer blade support members (3) supported at right angles to maintain the contact area. To be installed. The heat conduction effect of the heat storage material (1) and the heat medium (2) is further improved in proportion to the contact area. That is, the increase / decrease adjustment of the number of blades (3) ensures the required flow rate and compensates for efficient hot water supply and heating loads.

It is an Example of this invention.
It is an Example of the composition which adjusted the sodium acetate type | system | group chosen among AB employ | adopted to this invention appropriately. Table 1 shows the weight of the heat storage material in terms of heat dissipation with a specific heat of 0.35 [Kcal / Kg / ° C.] density average of 1.42. The tube-wing heat exchange heat storage container was used as a sealed sample. Table 1 shows the measured values of the temperature at the inlet and outlet of the heater measured by the data logger for the heat absorption and heat dissipation properties with the flow rate of hot water heated up to 75 ° C by an electric heater set to a constant flow rate by an electromagnetic pump. . The amount of heat required was almost the same as the DSC measurement method, and the amount of heat of the system (1) employed in the examples was close to the theoretical value of the original phase. In addition, a composition sample (1) that adjusts the melting point of sodium acetate trihydrate is prepared, and in the repeated examples, a thermal history test is performed assuming practical use. Show.
ΔT = 20 ° C. The measurement result of the latent heat storage body, which was implemented under the environment temperature, showed a value almost close to the original theoretical value of the system. The symbol A in Table 1 is the sample 1 tube blade support and sodium acetate trihydrate composition, and the symbol B is the sample 2 capsule structure and sample for the implementation of sodium acetate trihydrate. S, tap water only (for comparison)

As a heat storage device having heat exchange, an aluminum heat conduction blade (size width 150 / height 50 / thickness 0.5 mm × n) is passed through a volume of 6,000 ml in an iron container (4) with respect to the flow direction of the water pipe. Table 1 shows that the support (3) is carried at right angles at intervals of 5 mm. The latent heat radiation composition (1) prepared by adjusting sodium acetate hydrate having a specific melting point of the system was charged with a fixed amount of 5 l (7 Kg). Similarly, the latent heat dissipating composition (1) prepared by adjusting sodium acetate hydrate having a specific melting point is mounted in a plastic capsule container, and a unit of 250 g in a total weight of 2,250 g is filled in a container filled with 2.750 ml of water. The volume was 6,000 ml. It shows in Table 1 about the latent heat storage material of an Example. As described above, an electric heater is installed in each of the A, B, and S devices, the water temperature is set to 75 ° C., the heated water is circulated to each sample by an electric pump, and the heat exchange function of A and B is measured in terms of thermal conductivity. The differences shown in Table 2 were made. A temperature sensor was connected to the hot water outlet and intake port of the heating device, the water inlet and outlet of the device, and the main body, and the temperature was measured with a temperature data logger. A water flow meter was installed at the water outlet, and the outlet water volume / second of the water collection header was measured. Table 2 shows the average values of items A, B, and S of the heat quantity, melting point, and internal temperature of the system related to the function of heat dissipation / endotherm.

The invention's effect

  A metal water pipe (2) related to a heat source and a load was supported in a state where the necessary number of metal blades (3) having good heat conduction was supported and the latent heat storage composition (1) in contact with the support. The internal configuration efficiently supplies energy from the heat medium (2) and the latent heat of fusion (1). The adopted heat storage material sodium acetate type (1) has a heat supply function of maintaining a heat release of a required heat amount of 60 cal / g at a constant temperature of 56 ° C. for a fixed time. A heat exchange type heat storage device having a large latent heat ratio as an operation method for storing atmospheric heat in the heat storage container with a heat source device using nighttime power. The amount of heat storage and heat exchange supply function contribute to space saving by downsizing the device.

This drawing is a perspective view of a heat exchange heat storage unit that takes in heat or dissipates heat. Satisfied in a state where the latent heat storage composition (1) is supported on a support body in which a plurality of aluminum heat conduction blades (3) supported on a metal water pipe (2) that conducts hot running water led from a heat source device is supported. It is a configuration oblique view of a heat storage device that is provided with a heat exchange function. These are top views of the heat exchange heat storage apparatus which shows arrangement | positioning of a water flow pipe (2) and a radiation blade (3). These are unit sectional drawings which show the structure which accumulated the heat exchange heat storage single-piece | unit connected to the heat collecting / dividing header (6).

Explanation of symbols

1 to FIG. 3, reference numeral 1-latent heat storage composition / latent heat radiation 2-flow pipe for introducing water flow and heat medium 3-aluminum heat transfer blade / supported support 4-heat storage container 5-unit heat insulation Material 6-Heat Collection / Diversion Header

Claims (2)

  A water pipe that circumscribes the heat source and the load section, and a support body that has an opening that can be freely opened and closed for filling the heat storage material, and a plurality of good transmission metal blades are carried on the water pipe in a sealed container; The present invention relates to a latent heat storage device having a heat exchange function in which a system that absorbs and dissipates heat by phase change at the melting point is loaded in a state in which an adjustment mixture of electrolyte hydrate is supported. A system in which the mixing weight ratio of CH ₃ COONa crystals and H ₂ O is 60 to 40 with respect to 100% by weight of the adjusted mixed compound undergoing phase change has a mixing ratio of 70% by weight or more, and the structural formula of palygorskite is (Mg, AL) ₂ SiO ₁₀ (OH) · 4H ₂ O or hydrated magnesium silicate is a porous fibrous ceramic whose main component is 2MgO · 3SiO ₂ · nH ₂ O and each particle size is from 0.1 μm. Selected from the range of 100 mesh, alone or in combination, 0.01 to 20% by weight, selected from succinic acid, HOOC (CH ₂ ) ₂ COOH or LiF, 0.01 to 10% by weight, benzotriazole C ₂ It relates to claim 1, which is filled with a conditioning mixture composed of H ₃ N ₃ 1.0 to 10%.

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