CN109945531A - Medium-high temperature air gradient pore phase-change heat storage unit - Google Patents

Abstract

The invention discloses a medium-high temperature air gradient hole phase change heat storage unit which is connected with a solar air heat collector and receives hot air as input, wherein a communication pipeline with a tree-shaped structure is arranged in the heat storage unit, the diameter of the pipeline of the communication pipeline is gradually reduced from an inlet end to an outlet end of the heat storage unit, a phase change material for heat storage is filled and packaged in the communication pipeline, and a heat transfer medium is filled in the heat storage unit. The heat storage unit forms an optimized heat exchange structure by utilizing the form of a 3-dimensional heat exchange bionic pore structure, and solves the problem of poor heat release performance of a phase change material. According to the invention, the phase-change materials are placed in the communication pipelines distributed in gradient holes with different diameters, and the phase-change materials with different phase-change points are placed from the inlet of the heat storage unit to the outlet of the heat storage unit, so that the optimal response is realized to the temperatures of the tail end and the source end, and the system can reach the optimal heat release parameters.

Description

Medium and high temperature air gradient hole phase change heat storage unit

technical field

The invention relates to the technical field of air heat storage, in particular to a medium and high temperature air gradient hole phase change heat storage unit, which can be used for heat storage of medium and high temperature collection of solar energy, heat storage of industrial waste heat and waste gas, and the like.

Background technique

Air heat storage is the current demand in the field of industrial and agricultural solar drying. Heat storage can output stable temperature, flow and pressure. The air density is low, so the heat exchange capacity is poor at the same flow rate. Increasing the flow rate faces an increase in pressure loss, so the air heat exchanger needs a larger heat exchange area.

In a multi-stage heat storage device disclosed in the prior art, at least two heat storages are connected in series between adjacent heat storages by means of heat transfer channels, but this technical solution does not take into account that different apertures are set in the heat storage body And place the phase change heat storage material to adapt to the best heat exchange effect, and no further consideration is given to the heat exchange between the air and the phase change material.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a medium and high temperature air gradient hole phase change heat storage unit in order to solve the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved by adopting the following technical solutions:

A medium and high temperature air gradient hole phase change heat storage unit is connected to a solar air heat collector and receives hot air as an input. The inlet end of the heat storage unit presents a gradient decreasing from the outlet end, the interior of the communication pipe is filled with a phase change material for heat storage, and the interior of the heat storage unit is filled with a heat transfer medium.

Further, the heat storage unit is filled with gas or liquid as a heat transfer medium.

Further, the heat storage unit performs heat charging and heat release through the phase change material.

Further, the phase change material is not in direct contact with the heat transfer medium in the gradient holes of the communication pipes.

Further, the temperature range of the phase change material is 40-500°C.

Further, the phase change material filled into the communication pipe has different phase change points from the inlet end to the outlet end of the heat storage unit for heat transfer media of different temperatures.

Compared with the prior art, the present invention has the following advantages and effects:

1. The heat storage unit of the present invention uses the form of a 3-dimensional heat exchange bionic pore structure to form an optimized heat exchange structure, which solves the problem of poor heat release performance of phase change materials.

2. In the present invention, the phase change material is placed in the communicating pipes with different diameter gradient holes, and the phase change materials with different phase change points are placed from the inlet of the heat storage unit to the outlet of the heat storage unit, and the temperature at the end and the source end is realized. The best response so that the system achieves the best exothermic parameters.

Description of drawings

Fig. 1 is the structural plan section of the heat storage unit of the medium and high temperature air gradient hole phase change heat storage unit disclosed in the present invention;

FIG. 2 is an elevational sectional view of the heat storage unit of the medium and high temperature air gradient hole phase change heat storage unit disclosed in the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example

This embodiment discloses a medium and high temperature air gradient hole phase change heat storage unit, which can be connected to a solar air heat collector, and uses gas or liquid as the heat transfer medium and phase change material as the heat storage medium. The hot air exchanges heat with pipes of different diameters, and transfers the heat to the phase change material around the air, and then uses the phase change material for heat storage. According to the temperature of the phase change material, different air temperatures can be obtained and sent to the end user. The phase change material in the heat storage unit is placed in the communication pipe of the heat storage unit. The pipe structure is a similar tree-like structure. Specifically, the communication pipes 1, 2 and 3 of different diameters allow air to flow outside the communication pipes. The heat transfers the heat to the phase change material in the communication pipe, and after sufficient heat exchange, the air flows out from the outlet of the heat storage unit.

The phase change material is used for heat storage and is encapsulated in the communication pipeline. The phase change heat storage unit charges and releases heat through the phase change material, and the phase change material does not directly contact the heat transfer fluid in the gradient holes of the communication pipeline;

The temperature range of the phase change material in the gradient pores of the communication pipes is 40-500°C.

The heat storage unit utilizes the form of a 3-dimensional heat exchange bionic pore structure to form an optimized heat exchange structure. The problem of poor exothermic performance of phase change materials is solved. The gradient holes connecting the pipes can be made by the template method.

As shown in Figs. 1 and 2, the communication pipes 1, 2, 3 are filled with a phase change material for heat storage. The heat transfer medium flows in from one end of the heat storage unit and flows out from the other end, while exchanging heat with the phase change material in the communication pipes 1 , 2 and 3 . The pipe diameters of the communication pipes 1, 2, and 3 are different. Due to the large temperature difference between the air temperature at the entrance of the heat storage unit and the phase change material in the heat storage body, the diameter at the entrance of the heat storage body is larger. Therefore, the diameter of the connecting pipes in the heat storage unit is gradually reduced to achieve a reasonable heat exchange balance.

For heat transfer media with different temperatures, the communication pipes 1, 2, and 3 can be filled with phase-change materials with different phase-change points. These materials achieve optimal response to tip and source temperatures so that the system achieves optimal exothermic parameters including temperature, pressure, flow, etc.

To sum up, this embodiment discloses a medium-high temperature air gradient heat storage unit filled with phase change material, which is connected in series with a solar air heat collector, and uses air as a heat transfer medium. The phase change material of the heat storage unit is arranged Inside the communicating duct, the air is outside the communicating duct. The communication pipes placed by the phase change material are distributed with gradient pores of different diameters. Phase change materials with different phase change points can be placed from the inlet of the heat storage unit to the outlet of the heat storage unit to adapt to the best heat exchange effect.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.

Claims (6)

1. a kind of high temperature air gradient hole phase-change heat accumulation unit, connect with solar energy air heat collector and receives hot-air conduct Input, which is characterized in that the heat storage units are internally provided with the connecting pipe of tree, and the pipeline of the connecting pipe is straight Diameter is presented gradient to outlet end from heat storage units arrival end and successively decreases, and filling is packaged with for heat accumulation inside the connecting pipe Phase-change material, the heat storage units inside are filled with heat transfer medium.

2. high temperature air gradient according to claim 1 hole phase-change heat accumulation unit, which is characterized in that the heat accumulation list First internal filling gas or liquid are as a heat transfer medium.

3. high temperature air gradient according to claim 1 hole phase-change heat accumulation unit, which is characterized in that the heat accumulation list Member carries out filling heat and heat release by phase-change material.

4. high temperature air gradient according to claim 1 hole phase-change heat accumulation unit, which is characterized in that the phase transformation material Material in the gradient pore of connecting pipe not directly and heat transfer medium contacts.

5. high temperature air gradient according to claim 1 hole phase-change heat accumulation unit, which is characterized in that the phase transformation material The temperature range of material is 40-500 DEG C.

6. high temperature air gradient according to claim 1 hole phase-change heat accumulation unit, which is characterized in that filling connecting pipe Phase-change material be directed to different temperatures heat transfer medium, have different transformation temperatures.