A heat storage type warm air supply device with multiple heat sources

Abstract

The embodiment of the present invention provides a heat storage type warm air supply device with multiple heat sources for heating, which relates to the field of thermal energy technology. It comprises a heat preservation cavity, a Villemire heat pump, a low-grade heat collector, a heat exchanger and a heat storage medium built into the heat preservation cavity. The heat storage medium is connected to an external power supply device through a heating element. The heat preservation cavity is provided with an air inlet and an air outlet. The Villemire heat pump is installed at the air inlet. The high-temperature cavity of the Villemire heat pump is thermally connected to the heat storage medium. The low-grade heat collector is located outside the heat preservation cavity. The heat exchanger is located inside the heat preservation cavity and is thermally connected to the heat storage medium. The heat exchanger is connected to the low-grade heat collector. The heat storage type warm air supply device with multiple heat sources for heating provided by the embodiment of the present invention has a heat energy driven Villemire heat pump installed at the air inlet. While using off-peak electricity to store heat, it can also collect low-grade heat with the help of a low-grade heat collector, and then provide heat during the peak electricity stage, thereby reducing power consumption and heating costs.

Description

Technical Field

[0001] The invention relates to the technical field of thermal energy, and in particular to a heat storage type warm air supply device for heating with multiple heat sources. Background Art

[0002] With the rapid development of the power industry, more and more power station systems have emerged in China. The load is reduced during the off-peak period, resulting in a large amount of surplus off-peak electricity. The characteristics of power products are that production, supply and sales are completed at the same time. The large amount of surplus off-peak electricity leads to the waste of power resources, which is not conducive to energy conservation and environmental protection. For this reason, different electricity prices are used for off-peak electricity and peak electricity to urge people to use electricity at off-peak times, improve energy utilization and reduce waste.

[0003] In the cold winter, indoor heating requires hot air; industrial operations such as drying also require a large amount of hot air. At present, the commonly used methods are indoor heating with air conditioning or other electric heating methods. However, these devices mostly use real-time heating methods, which cannot achieve peak electricity consumption and have high heating costs. Summary of the invention

[0004] The embodiment of the present invention provides a heat storage type warm air supply device with multiple heat sources for heating, so as to solve the defect of high warm air supply cost in the prior art, realize peak-shifting electricity consumption, and reduce heating costs.

[0005] An embodiment of the present invention provides a heat storage type warm air supply device for heating with multiple heat sources, comprising a heat preservation cavity, a Villemire heat pump, a low-grade heat collector, a heat exchanger and a heat storage medium built into the heat preservation cavity, the heat storage medium being connected to an external power supply device through a heating element, the heat preservation cavity being provided with an air inlet and an air outlet, the Villemire heat pump being installed at the air inlet, the high-temperature cavity of the Villemire heat pump being thermally connected to the heat storage medium, the low-grade heat collector being located outside the heat preservation cavity, the heat exchanger being located inside the heat preservation cavity and being thermally connected to the heat storage medium, and the heat exchanger being connected to the low-grade heat collector.

[0006] According to a thermal storage type warm air supply device with multiple heat sources for heating according to an embodiment of the present invention, one end of the heating element is installed inside the thermal storage medium, and the other end of the heating element extends out of the thermal insulation cavity.

[0007] According to a thermal storage type warm air supply device with multiple heat sources for heating according to an embodiment of the present invention, there are multiple heating elements.

[0008] According to a heat storage type warm air supply device with multiple heat sources for heating according to one embodiment of the present invention, the heat preservation cavity includes an outer wall and an inner wall, the outer wall is located outside the inner wall, and the accommodating space formed between the inner wall and the outer wall is filled with heat preservation material.

[0009] According to the multi-heat source heat storage type warm air supply device of one embodiment of the present invention, the heat storage medium is any one of magnesium bricks, steel balls, molten salt and paraffin.

[0010] According to a thermal storage type warm air supply device with multiple heat sources for heating according to an embodiment of the present invention, the thermal storage medium divides the heat preservation cavity into a left chamber and a right chamber, and the air inlet and the air outlet are respectively arranged in the left chamber and the right chamber.

[0011] According to the thermal storage type warm air supply device with multiple heat sources for heating in one embodiment of the present invention, a base is fixedly installed in the heat preservation cavity, and the thermal storage medium is stacked on the base.

[0012] According to a multi-heat source heat storage type warm air supply device of one embodiment of the present invention, the air inlet is located below the medium temperature chamber of the Villemire heat pump, and the air outlet is located on a side of the base away from the air inlet.

[0013] According to a heat storage type warm air supply device with multiple heat sources for heating according to one embodiment of the present invention, when the heat source temperature is higher than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air outlet, and when the heat source temperature is lower than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air inlet.

[0014] A heat storage type warm air supply device with multiple heat sources for heating provided by an embodiment of the present invention uses off-peak electricity to heat the air and then provides heat during peak electricity periods, thereby effectively saving electricity. A thermal energy-driven Villemire heat pump is installed at the air inlet. Compared with a traditional electric energy-driven vapor compression heat pump, it does not require electric energy to drive, thereby reducing the power consumption of the entire device. Moreover, the heat pump cycle driven by thermal energy absorbs heat in a room temperature chamber and a high temperature chamber, and can release several times the amount of heat absorbed by the high temperature chamber in the medium temperature chamber, thereby improving heating efficiency and significantly reducing electricity costs. At the same time, the thermal energy-driven warm air supply device with multiple heat sources for heating is also provided with a low-grade heat collector to collect low-grade heat, thereby further reducing power consumption and reducing heating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a heat storage type warm air supply device with multiple heat sources for heating provided by an embodiment of the present invention;

[0017] Figure 2 It is a schematic structural diagram of a heat storage type warm air supply device with multiple heat sources provided in another embodiment of the present invention.

[0018] Reference numerals:

[0019] 10. Insulation cavity; 11. Air inlet; 12. Air outlet; 13. Outer wall; 14. Inner wall; 15. Insulation material; 20. Villemire heat pump; 21. Room temperature cavity; 22. Medium temperature cavity; 23. High temperature cavity; 30. Heat storage medium; 40. Low-grade heat collector; 50. Heat exchanger; 60. Heating element; 70. Base. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are for the purpose of clearly describing the numbering of product components and do not represent any substantial difference. The directions of "up", "down", "left" and "right" are all based on the directions shown in the accompanying drawings. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0022] Combine the following Figure 1 and Figure 2 The structure of a heat storage type warm air supply device for supplying heat from multiple heat sources according to an embodiment of the present invention is described.

[0023] like Figure 1 As shown, the heat storage type warm air supply device with multiple heat sources for heating provided by the embodiment of the present invention comprises a heat preservation cavity 10, a Villemire heat pump 20, a heat storage medium 30, a low-grade heat collector 40 and a heat exchanger 50. The heat storage medium 30 is built into the heat preservation cavity 10, and the heat storage medium 30 is connected to an external power supply device through a heating element 60. The external power supply device is electrically connected to the heating element 60, and the heat storage medium 30 is heated by the heating element 60, and the heat is stored in the heat storage medium 30.

[0024] The heat preservation cavity 10 is provided with an air inlet 11 and an air outlet 12, and the Villemire heat pump 20 is installed at the air inlet 11. The room temperature cavity 21 of the Villemire heat pump 20 is located outside the heat preservation cavity 10, the medium temperature cavity 22 and the high temperature cavity 23 of the Villemire heat pump 20 are located inside the heat preservation cavity 10, and the high temperature cavity 23 of the Villemire heat pump 20 is thermally connected to the heat storage medium 30. The low-grade heat collector 40 is located outside the heat preservation cavity 10, and the heat exchanger 50 is located inside the heat preservation cavity 10 and connected to the low-grade heat collector 40. The heat exchanger 50 is thermally connected to the heat storage medium 30. As a result, the Villemire heat pump 20, the heat storage medium 30 and the heat exchanger 50 are thermally connected to each other. The heating element 60 heats the heat storage medium 30 to provide thermal energy for the Villemire heat pump 20, the heat storage medium 30 and the heat exchanger 50. The low-grade heat collector 40 absorbs external solar energy or waste heat and then transfers the heat to the heat exchanger 50, the heat storage medium 30 and the Villemire heat pump 20.

[0025] After entering from the air inlet 11, the external air passes through the medium temperature chamber 22, the high temperature chamber 23 and the heat storage medium 30 of the Villemire heat pump 20 in sequence, and the temperature gradually increases, and then is discharged from the air outlet 12. The position of the heat exchanger 50 needs to be set on different sides of the heat storage medium 30 according to the different temperatures of the heat source. Among them, the heating element 60 heats in the low-peak power stage, and the heating element 60 stops heating in the peak power stage.

[0026] When in use, after the device is turned on, the Villemire heat pump 20 starts to maintain the running state, and the external air continuously entering from the air inlet 11 is heated to high-temperature air and then discharged from the air outlet 12 to supply users. In the off-peak power stage, the heating element 60 continuously heats the heat storage medium 30 and the high-temperature chamber 23, converts electrical energy into heat energy and stores it in the heat storage medium 30. At the same time, the low-grade heat collector 40 collects low-grade heat such as solar energy and industrial waste heat, and transfers it to the heat storage medium 30 and the high-temperature chamber 23. After the external air enters from the air inlet 11, it passes through the medium-temperature chamber 22 and the high-temperature chamber 23 of the Villemire heat pump 20, the heat storage medium 30 and the heat exchanger 50, and is heated to high-temperature air and then discharged from the air outlet 12. In the peak power stage, the heating element 60 stops heating, the Villemire heat pump 20 continues to operate, the low-grade heat collector 40 continues to collect low-grade heat, and the external air is still heated to high-temperature air through the medium-temperature chamber 22, the high-temperature chamber 23, the heat storage medium 30 and the heat exchanger 50. The whole device uses off-peak electricity to store energy, and the electricity cost is low. At the same time, a low-grade heat collector 40 is used to collect low-grade heat, which further reduces the consumption of electricity, saves electricity and reduces electricity costs. After entering from the air inlet 11, the external air passes through the medium temperature chamber 22, the high temperature chamber 23 and the heat storage medium 30 in sequence, and the temperature is gradually increased, realizing the step-by-step utilization of heat energy, and further improving the heating effect.

[0027] The heat storage type warm air supply device with multiple heat sources for heating provided in the embodiment of the present invention uses low-peak electricity to heat the air, and then provides heat during the peak electricity stage, effectively saving electricity. A heat-driven Willemer heat pump 20 is installed at the air inlet 11. Compared with the traditional electric-driven vapor compression heat pump, it does not require electric drive, which reduces the power consumption of the entire device. Moreover, the heat pump cycle driven by heat energy can release several times the heat absorbed by the high-temperature chamber 23 in the medium-temperature chamber 22 by absorbing heat in the room-temperature chamber 21 and the high-temperature chamber 23, thereby improving the heating efficiency and significantly reducing the electricity cost. At the same time, the heat storage type warm air supply device with multiple heat sources for heating is also provided with a low-grade heat collector 40 to collect low-grade heat, which can further reduce power consumption and reduce heating costs.

[0028] One end of the heating element 60 is installed inside the heat storage medium 30, and the other end of the heating element 60 extends out of the heat preservation cavity 10. Figure 1 As shown, the heating element 60 penetrates the entire heat storage medium 30 in the transverse direction, and extends through the heat preservation cavity 10 to the outside of the heat preservation cavity 10 so as to be connected to the electrical lead of the external power supply device.

[0029] Based on any of the above embodiments, there can be multiple heating elements 60. Multiple heating elements 60 are arranged in parallel to facilitate connection with the electrical leads of the external power supply device. Of course, multiple heating elements 60 can be arranged in different directions, such as some heating elements 60 are arranged in the horizontal direction and other heating elements 60 are arranged in the longitudinal direction. With the help of multiple heating elements 60, the heat storage medium 30 is heated at the same time, so that the heat storage medium 30 can quickly accumulate a large amount of heat and heat up quickly.

[0030] The heat preservation cavity 10 includes an outer wall 13 and an inner wall 14. The outer wall 13 is located outside the inner wall 14. The accommodation space formed between the inner wall 14 and the outer wall 13 is filled with heat preservation material 15. Figure 1 As shown, the inner wall 14 and the outer wall 13 are connected to each other and form a certain accommodation space between the two. The accommodation space is filled with a heat-insulating material 15 to prevent heat from diffusing outward and improve the utilization rate of heat energy. The heat-insulating material 15 can be any one or a combination of multiple types of polyester foam, glass wool and rock wool, which is not specifically limited in the embodiment of the present invention.

[0031] In an embodiment of the present invention, the heat storage medium 30 uses solid heat storage materials such as magnesium bricks and steel balls or phase change heat storage materials such as molten salt and paraffin, and has a high heat storage density. For example, the heat storage medium 30 is formed by stacking a plurality of magnesium bricks or steel blocks. For another example, the heat storage medium 30 uses high-temperature molten salt, and the high-temperature molten salt is stored in a shell-like structure. Of course, the heat storage medium 30 can also use thermochemical heat storage materials or adsorption heat storage materials.

[0032] like Figure 1As shown, the heat storage medium 30 divides the heat preservation cavity 10 into a left cavity and a right cavity, and the air inlet 11 and the air outlet 12 are arranged in the left cavity and the right cavity respectively, so as to ensure that the air entering the heat preservation cavity 10 passes through the heat storage medium 30 to fully absorb heat before being discharged. For example, the air inlet 11 can be arranged in the left cavity, and correspondingly, the air outlet 12 is arranged in the right cavity; for another example, the air inlet 11 is arranged in the right cavity, and the air outlet 12 is arranged in the left cavity. The Villemire heat pump 20 is installed at the air inlet 11 to ensure that the external air passes through the medium temperature cavity 22 and the high temperature cavity 23 successively after entering to increase the temperature step by step, thereby improving the heat utilization rate and the air heating effect. Specifically, the size of the left cavity and the right cavity can be the same or different, and the distinction between left and right is only used to distinguish the two cavities without any orientation limitation. After the external air enters from the air inlet 11, it needs to pass through the heat storage medium 30 to absorb heat and transform into high-temperature air, and then be discharged from the air outlet 12.

[0033] Specifically, Figure 1 As shown, a base 70 is fixedly installed in the thermal insulation cavity 10, and the heat storage medium 30 is arranged on the base 70. The heat storage medium 30 may contact the top of the thermal insulation cavity 10, or a certain gap may be reserved for the thermal expansion and contraction of the heat storage medium 30. The heat storage medium 30 is connected to the base 70, and the thermal insulation cavity 10 is divided into two chambers. The high-temperature cavity 23 is thermally connected to the heat storage medium 30. In order to prevent the medium-temperature cavity 22 from being affected by the heat storage medium 30, the medium-temperature cavity 22 is arranged corresponding to the base 70. For example, the arrangement direction of the high-temperature cavity 23 and the medium-temperature cavity 22 is consistent with the arrangement direction of the heat storage medium 30 and the base 70.

[0034] The medium temperature chamber 22 is connected to the room temperature chamber 21 and the high temperature chamber 23 through connecting pipes. The connecting pipes connecting the medium temperature chamber 22 and the room temperature chamber 21 pass through the wall of the insulation chamber 10, and the connecting pipes connecting the medium temperature chamber 22 and the high temperature chamber 23 are located inside the insulation chamber 10.

[0035] In the embodiment of the present invention, the air inlet 11 is located below the medium temperature chamber 22 of the Villemire heat pump 20, and the air outlet 12 is located on the side of the base 70 away from the air inlet 11. An air inlet fan can be installed at the air inlet 11, and an air outlet fan can be installed at the air outlet 12. The air entering the air inlet 11 flows upward from the bottom, passes through the medium temperature chamber 22 and the high temperature chamber 23 in sequence, and then passes through the heat storage medium 30, and is dispersed from the air outlet 12 located on the other side of the heat storage medium 30. The air outlet 12 is set corresponding to the base 70, so that the high-temperature air after passing through the heat storage medium 30 is fully mixed before being discharged to avoid local high temperature.

[0036] Among them, Figure 1 As shown, when the heat source temperature is higher than the required warm air temperature, the heat exchanger 50 is installed on the side of the heat storage medium 30 close to the air outlet 12. Figure 2As shown, when the heat source temperature is lower than the required warm air temperature, the heat exchanger 50 is installed on the side of the heat storage medium 30 close to the air inlet 11. Figure 1 As shown, when the heat source temperature is higher than the required warm air temperature, the heat exchanger 50 is installed on the right side, that is, installed on the air outlet side of the heat storage medium 30, and the air is further heated by the heat exchanger 50 after passing through the heat storage medium 30. Figure 2 As shown, when the heat source temperature is lower than the required warm air temperature, the heat exchanger 50 is installed on the left side, that is, the air inlet side of the heat storage medium 30, so that the air first passes through the heat exchanger 50 and then passes through the heat storage medium 30 to further increase the temperature. The heat exchanger 50 is installed on the base 70.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat storage type warm air supply device with multiple heat sources, characterized in that: It includes a heat preservation cavity, a Villemire heat pump, a low-grade heat collector, a heat exchanger and a heat storage medium built into the heat preservation cavity, the heat storage medium is connected to an external power supply device through a heating element, the heat preservation cavity is provided with an air inlet and an air outlet, the Villemire heat pump is installed at the air inlet, the high-temperature cavity of the Villemire heat pump is thermally connected to the heat storage medium, the low-grade heat collector is located outside the heat preservation cavity, the heat exchanger is located inside the heat preservation cavity and is thermally connected to the heat storage medium, and the heat exchanger is connected to the low-grade heat collector; The heating element is used to turn on in the valley electricity phase to heat the thermal storage medium, and turn off in the peak electricity phase to stop heating the thermal storage medium; The heat storage medium is used to store the heat of the heating element and the heat collected by the low-grade heat collector; The temperatures of the medium-temperature chamber, high-temperature chamber and the heat storage medium of the Villemire heat pump increase step by step, and the external air enters from the air inlet and passes through the medium-temperature chamber, the high-temperature chamber and the heat storage medium in sequence before being discharged from the air outlet.

2. The heat storage type warm air supply device with multiple heat sources according to claim 1, characterized in that: One end of the heating element is installed inside the heat storage medium, and the other end of the heating element extends out of the heat preservation cavity.

3. The heat storage type warm air supply device with multiple heat sources according to claim 2, characterized in that: The number of the heating elements is multiple.

4. The heat storage type warm air supply device with multiple heat sources according to claim 1, characterized in that: The heat-insulating cavity comprises an outer wall and an inner wall, wherein the outer wall is located outside the inner wall, and a accommodating space formed between the inner wall and the outer wall is filled with heat-insulating material.

5. The heat storage type warm air supply device with multiple heat sources according to claim 1, characterized in that: The heat storage medium adopts phase change heat storage material.

6. The heat storage type warm air supply device with multiple heat sources according to claim 1, characterized in that: The heat storage medium divides the heat preservation cavity into a left chamber and a right chamber, and the air inlet and the air outlet are respectively arranged in the left chamber and the right chamber.

7. The heat storage type warm air supply device with multiple heat sources according to any one of claims 1 to 6, characterized in that: A base is fixedly installed in the heat preservation cavity, and the heat storage medium is stacked on the base and contacts the top of the heat preservation cavity.

8. The heat storage type warm air supply device with multiple heat sources according to claim 7, characterized in that: The air inlet is located at the bottom of the heat preservation cavity, and the air outlet is arranged corresponding to the base.

9. The heat storage type warm air supply device with multiple heat sources according to claim 1, characterized in that: When the heat source temperature is higher than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air outlet; when the heat source temperature is lower than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air inlet.

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