CN100545541C - Double-box forced circulation type solar water heater - Google Patents

Abstract

Disclosed is a hot water heater using solar energy as a heat source instead of a limited natural resource (e.g., coal, oil, etc.) of a double tank and a forced circulation type solar hot water heater having a double tank structure with an inner tank and an outer tank, in which a heat storage tank and a heat exchanger are constructed as a single body. In the space between the inner and outer boxes, a spiral flow guide is provided to improve the heat exchange efficiency by using the entire heat transfer surface. Such a solar hot water heater does not have to separately install a heat exchanger and an evaporation tank outside a heat storage tank like a conventional solar heat exchange system. Such a double tank and forced circulation type solar hot-water heater thus reduces installation costs and installation space, and can be easily installed in a narrow space such as a balcony, thereby being effectively used as a hot-water heating system.

Description

Double box and forced circulation solar hot water heater

technical field

The present invention relates to a hot water heater using solar energy as a heat source, and more particularly, to a double-tank and forced circulation solar hot water heater, which is applied to a solar concentrator installed outdoors and a heat storage tank installed in the Indoor split system.

Background technique

Solar energy is a clean energy source that is an alternative to limited natural resources such as fossil fuels. Solar energy is the focus of various alternative energy sources because it can be obtained in the simplest way and exhibits high efficiency.

The solar hot water heater includes a heat concentrator for concentrating solar energy to heat a heating medium, a heat exchanger for heating water through heat exchange between the heating medium and water, and a heat storage tank for storing hot water. According to the installation position of the heat storage tank, the heat exchanger can be divided into an integral heat exchanger and a separate heat exchanger. In addition, according to the circulation mode of the heating medium and water, the heat exchanger can also be divided into a natural circulation type and a heat exchanger. Forced circulation. However, the heat exchange efficiency of the natural circulation heat exchanger is very low, and the heat storage tank needs to be installed above the heat collector, so the heat storage tank should be kept warm so as not to be cracked by freezing. Therefore, this requires a lot of maintenance costs.

The traditional forced circulation and separated solar heat exchange system includes a heat concentrator 9 installed outdoors, a heat storage tank 1' for storing hot water, a heat exchanger for heating water through heat exchange between heating medium and water 12. Auxiliary pipe 16' for connecting heat storage tank 1' and heat exchanger 12, main pipe 17' for connecting heat accumulator 9 and heat exchanger 12, auxiliary pump 10 for circulating cold water or hot water , the main pump 8' for circulating the heating medium, the air separator 15 for separating the air in the heating medium in the main pipe 17', the evaporation tank 13 for receiving the evaporated heating medium, the heating medium for storing the heating medium A medium storage tank 14, and a heating medium automatic spray pump 11 for automatically spraying heating medium, as shown in FIG. 1 .

As shown in Fig. 2, the integrated heat exchange system is configured such that a heat exchanger 18 is installed in a heat storage tank 1'. In addition, its working principle is as follows: according to the density difference of the heating medium before and after heating, the heating medium circulates naturally to exchange heat in the heat exchanger 18 in the heat storage tank 1' to heat hot water.

The traditional forced circulation solar system is configured to sense the temperature difference between the hot spot and the cold spot in the system through a separate temperature difference controller, so that the heating medium and hot water are automatically circulated, thereby passing the heating medium and water in the heat exchanger 12 Heat exchange to heat water.

However, the conventional forced circulation solar system is expensive to install and requires a lot of space because the heat exchanger 12, evaporation tank 13, air separator 15 and auxiliary pump 10 are respectively installed outside the heat storage tank 1'. Therefore, this system cannot be used in the case where the thermal storage tank 1' should be installed on a balcony.

Contents of the invention

The present invention aims to solve such problems in the prior art, and therefore an object of the present invention is to provide a double-tank and forced circulation solar hot water heater, wherein the heat exchanger is configured such that the outer circumference of the thermal storage tank has double Sleeve structure; the traditional separately installed components are integrally installed in the heat storage tank to simultaneously function as the evaporation tank and the air separator; the spiral deflector is formed in the double tank and is located between the inlet hole and the outlet hole of the heating medium , so that the heating medium can evenly contact the entire heat transfer surface, so that the short residence time of the heating medium in the double tank is compensated for by the forced circulation force of the circulation pump (because the residence time of the heating medium is short, the heat exchange performance is reduced).

In order to achieve the above object, the present invention provides a double-box and forced circulation solar hot water heater, including: a thermal concentrator installed outdoors to collect solar energy; a heat exchanger for heat exchange, which is connected to the a heat accumulator; a heat storage tank for storing heat exchanged by a heat exchanger; and a circulation pump for forcibly circulating a heating medium through a conduit, wherein the heat exchanger and the heat storage tank have an integral structure, and the integral structure It includes: an inner box installed inside and used as a hot water storage tank; an outer box installed around the inner box at a predetermined distance from the inner box and functions as a heat exchanger; a spiral deflector along the The outer circumference of the inner box is formed as a continuous spiral structure in the space between the inner box and the outer box, so that the heating medium introduced into the outer box flows spirally with heat exchange; the heating medium enters the hole, It is formed near the upper end of the outer box, so that the heating medium circulated through the heat collector is introduced to flow there, and has a film at one end to block the flow of fluid in a certain direction; the heating medium flows out of the hole, which Formed near the lower end of the outer box, it is used to discharge the heating medium after heat exchange; the liquid level valve is installed at a predetermined position on the top of the outer box, above the highest position of the spiral deflector, to check the liquid level of the heating medium And the air is discharged; and the heating medium evaporation space is located above the liquid level valve as a sealed space.

Description of drawings

In the following specific embodiments, the above objects, other objects, features and advantages of the present invention will be more fully described with reference to the accompanying drawings. The attached graphics include:

The schematic diagram of Figure 1 shows a traditional forced circulation and separated solar heat exchange system;

The schematic diagram of Figure 2 shows a traditional natural circulation and integral solar heat exchange system;

The schematic diagram of Fig. 3 has shown double box and forced circulation type solar hot water heater according to the present invention;

The schematic diagram of Fig. 4 shows a double tank and forced circulation solar hot water heater according to the present invention, wherein the thermal storage tank and the heat exchanger are constructed as a whole;

Figure 5 is a perspective view showing the internal configuration of the double box structure in Figure 4 .

Detailed ways

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 3 to 5 show a double-tank forced circulation solar hot water heater according to the present invention. Figure 3 shows the overall structure of the system. Figure 4 shows a double-tank structure in which the thermal storage tank and heat exchanger are constructed as a whole. Figure 5 shows the internal construction of the double box structure in Figure 4.

Referring to Fig. 3 to Fig. 5, the dual-box and forced circulation solar hot water heater according to the present invention includes: a heat concentrator 9 installed outdoors to collect solar energy; a heat exchanger for heat exchange, which passes through a conduit 16 and 17 is connected to the heat accumulator 9 ; the heat storage tank for storing the heat exchanged by the heat exchanger; and the circulation pump 8 for forced circulation of the heating medium through the conduits 16 and 17 .

The heat exchanger and the heat storage tank have an integral structure, and this integral structure includes: an inner tank 1 installed inside and used as a hot water storage tank; an outer tank 2 installed around the inner tank 1 with a space therebetween A predetermined distance, and acts as a heat exchanger; a spiral deflector 4, which is formed along the outer circumference of the inner case 1, as a continuous spiral structure in the space between the inner case 1 and the outer case 2, so that The heating medium introduced into the outer case 2 flows spirally with heat exchange; the heating medium enters the hole 5, which is formed near the upper end of the outer case 2, so that the heating medium circulated through the heat collector 9 is introduced to flow through it. , and has a film 5a at one end thereof, which is used to block the flow of fluid in a certain direction; the heating medium outflow hole 6 is formed near the lower end of the outer box 2, and is used to discharge the heat exchanged heating medium; the liquid surface A valve 7, which is installed at a predetermined position on the top of the outer box 2, above the highest position of the spiral deflector 4, to check the liquid level of the heating medium and discharge air; and a heating medium evaporation space, which is located as a sealed space Above the liquid level valve 7. Reference numeral 3 in Fig. 4 denotes an outer box support.

The following will briefly describe the circulation path of the heating medium in the hot water heater having the above configuration according to the present invention.

The hot heating medium transferred downward from the heat accumulator 9 by the circulation pump 8 is introduced into the upper part of the outer case 2 through the heating medium inlet hole 5 . Due to the membrane 5a installed at the end of the inlet hole 5, the introduced heating medium does not flow upwards but may flow downwards. As the downwardly flowing heating medium moves along the spiral deflector 4 formed in the space between the inner case 1 and the outer case 2, the heating medium contacts the inner case 1 over the entire heat transfer surface to exchange heat. After completing the heat transfer, the heating medium returns to the heat accumulator 9 again through the heating medium outflow hole 6 at the lower end of the outer case 2 . During the above series of processes, due to the temperature rise of the heating medium, the heating medium freely evaporates into the evaporation space above the liquid level valve 7 .

As mentioned above, the double tank and forced circulation solar hot water heater according to the present invention has a spiral deflector in the double tank, which is located between the inlet hole and the outlet hole of the heating medium, so that the heating medium and the entire heat transfer surface Uniform contact, thereby significantly improving heat transfer efficiency.

In addition, the dual-tank and forced-circulation solar hot water heater reduces installation costs and reduces the installation cost because it is not necessary to install the heat exchanger and the evaporation tank in a separate manner outside the thermal storage tank like conventional solar heat exchange systems. space. Therefore, the solar hot water heater of the present invention can be easily installed in a narrow space such as a balcony, so that it can be effectively used as a hot water heating system.

Claims (1)

1. A double-box and forced circulation solar hot water heater, comprising: a heat concentrator installed outdoors to collect solar energy; a heat exchanger for heat exchange, which is connected to the heat concentrator by a conduit; for storing a heat storage tank for heat exchanged by a heat exchanger; and a circulation pump for forced circulation of the heating medium through conduits; Wherein, the heat exchanger and the thermal storage tank have an integral structure; Among them, this overall structure includes: an inner tank, which is installed inside and serves as a hot water storage tank; The outer box, which is installed around the inner box, is spaced from the inner box, and functions as a heat exchanger; The spiral deflector, which is formed along the outer circumference of the inner box, acts as a continuous spiral structure in the space between the inner box and the outer box, so that the heating medium introduced into the outer box is accompanied by heat exchange in a spiral shape ground flow; A heating medium inlet hole is formed near the upper end of the outer case, so that the heating medium circulated through the heat collector is introduced to flow therethrough, and has a film at one end thereof to block the flow of fluid in a certain direction; A heating medium outlet hole is formed near the lower end of the outer box for discharging the heated medium after heat exchange; Liquid level valve, which is installed on the top of the outer box, above the highest position of the spiral deflector, to check the liquid level of the heating medium and discharge the air; And the heating medium evaporation space, which is located above the liquid level valve as a sealed space.

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