CN215864102U

CN215864102U - Phase-change heat storage rod for solar heat collection pipe

Info

Publication number: CN215864102U
Application number: CN202121518714.3U
Authority: CN
Inventors: 徐志龙; 其他发明人请求不公开姓名
Original assignee: Zhejiang Jinyu New Energy Technology Co ltd; Phase Change Energy Storage Beijing Technology Co ltd
Current assignee: Phase Change Energy Storage (Zhejiang) Technology Co.,Ltd.
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2022-02-18
Anticipated expiration: 2031-07-06

Abstract

The utility model discloses a phase change heat storage rod for a solar heat collection tube. The outer pipe and the inner pipe form a concentric sleeve, and the phase change material and the heat conduction fins are located between the outer pipe and the inner pipe. When the solar heat collector is used, the phase-change heat storage rod is placed in the solar heat collection pipe, the evaporation end of the solar gravity heat pipe is inserted into the inner pipe, heat energy converted by the solar heat collection pipe can be directly absorbed by the phase-change material in the phase-change heat storage rod and is transmitted to a heat exchange medium through the solar gravity heat pipe, the utilization efficiency of solar energy can be improved, the heat can be stored by the phase-change material to continuously release heat when sunlight is unstable, and the heat supply stability and continuity of a solar system are improved.

Description

Phase-change heat storage rod for solar heat collection pipe

Technical Field

The utility model relates to a solar heat collection system component, in particular to a heat storage component for a solar heat collection system.

Background

The solar gravity heat pipe has the advantages of fast heat transfer, small resistance, freezing prevention and the like, and is widely applied to pressure-bearing solar water heaters and heat application engineering. However, when the solar radiation intensity is high, the heat in the heat collecting tube is rapidly accumulated due to the heat transfer power of the gravity heat tube, so that the temperature is increased, the photo-thermal conversion efficiency is reduced, and the heat loss is increased; in cloudy weather, solar radiation is unstable, temperature fluctuation in a heat collecting pipe is large, and heat supply of a system is unstable; although the introduction of the phase-change material can improve the thermal inertia inside the heat collecting tube, the characteristic of low thermal conductivity of the phase-change material can cause the heat absorption and discharge speed to be too slow, and the utilization efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the existing problems, the utility model provides a phase-change heat storage rod for a solar heat collection tube, which can store redundant heat in the heat collection tube into the phase-change heat storage rod, reduce the temperature in the heat collection tube and improve the photo-thermal conversion efficiency; when the sunshine is unstable, the phase change heat storage rod can store heat and transmit the heat to the heat utilization terminal, so that the heat supply stability of the system is improved, and the heat supply time is prolonged.

The phase change heat storage rod for the solar heat collection tube comprises a tube body and a heat storage material, and is characterized in that the tube body is composed of an outer tube, heat conduction fins, an inner tube and a sealing end cover, and the heat storage material is a phase change material.

Further, the outer pipe and the inner pipe form a concentric sleeve, and the heat conduction fins and the phase change material are filled between the outer pipe and the inner pipe.

Furthermore, the outer pipe and the inner pipe are both metal pipes, and the wall thickness is 0.2mm-2 mm.

Further, the heat conducting fins are tightly connected to the inner side of the outer pipe and the outer side of the inner pipe at the same time.

Further, the outer tube and the inner tube form a concentric sleeve with sealed end caps.

Compared with the conventional technology, the utility model has the following beneficial effects:

the phase-change heat storage rod is internally provided with the heat exchange fins, so that the defect of low heat conductivity coefficient of a phase-change material can be overcome, the heat transfer time is shortened, and the heat transfer efficiency is improved; after the phase-change material in the phase-change heat storage rod absorbs heat and undergoes solid-liquid phase change, the heat transfer coefficient can be greatly improved, and the heat transfer efficiency of the phase-change heat storage rod is further improved.

Due to the characteristic that the phase-change material absorbs and releases heat to be approximately constant in temperature, the phase-change heat storage rod can be applied to the solar heat collection pipe to reduce the temperature peak value in the solar heat collection pipe and improve the photo-thermal conversion efficiency of the solar heat collection pipe.

When the sunshine condition is not good, the phase change heat-requiring rod can continuously output heat, the stability of the solar heat collection system is improved, and the heat using time is prolonged to a certain extent.

The heat conduction fins are arranged inside the phase-change heat storage rod, so that heat converted by the heat collection tube can be rapidly transferred to the phase-change material, and the heat transfer efficiency is improved.

Drawings

FIG. 1 is a cross-sectional view showing the overall structure of a phase-change heat storage rod according to the present invention;

FIG. 2 is an overall view of the phase change heat storage rod of the present invention;

reference numerals: 1. an outer tube; 2. a heat conductive fin; 3. an inner tube; 4. a phase change material; 5. and sealing the end cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1: as shown in fig. 1-2, a phase-change heat storage rod for a solar heat collection tube comprises an outer tube 1, a heat conduction fin 2, an inner tube 3, a phase-change material 4 and a sealing end cover 5.

The outer pipe 1 is made of aluminum alloy 6001 and has a wall thickness of 0.5 mm; the heat-conducting fins 2 and the inner tube 3 are integrally processed and molded in an extrusion mode; the inner diameter of the inner pipe 3 is 8.1 mm; the phase-change material 4 is a phase-change composite material with enhanced heat conduction, and the phase-change temperature range is 50-100 ℃; the sealing end cover 5 is made of aluminum alloy and is welded with the outer pipe 1.

The using method comprises the following steps: the inner tube 3 with the heat conduction fins 2 is inserted into the outer tube 1, one end of the outer tube 1 is sealed by a sealing end cover 5, the phase change material 4 is filled into an interlayer between the outer tube 1 and the inner tube 3, and the other end of the outer tube 1 is sealed by the sealing end cover 5, so that the phase change heat storage rod is prepared.

Example 2: in order to adapt to different processing techniques and phase-change material deformation requirements, the wall thicknesses of the outer pipe 1 and the inner pipe 3 are adjusted to be 1.8 mm; in order to adapt to the high-power solar gravity heat pipe, the inner diameter of the inner pipe 2 is adjusted to be 12.5mm, and the rest part is consistent with that of the embodiment 1.

Example 3: in order to reduce the processing cost of the phase change heat storage rod, the wall thicknesses of the outer tube 1 and the inner tube 3 were adjusted to 0.25mm, and the rest was the same as in example 1.

When the solar heat collector is used, the evaporation section of the solar gravity heat pipe is inserted into the inner pipe 3, the phase change heat storage rod is arranged in the heat collecting pipe, and the phase change heat storage rod and other devices such as a solar header and the like form a solar heat collecting system; when the sunlight radiation intensity is high, the redundant heat in the heat collecting pipe is stored in the phase-change heat storage rod, so that the temperature in the heat collecting pipe is reduced, and the photo-thermal conversion efficiency is improved; when sunlight is unstable, the phase change heat storage rod releases stored heat and conveys the heat to a heat utilization terminal, so that the heat supply stability of the system is improved, and the heat supply time is prolonged.

Claims

1. The utility model provides a phase change heat accumulation stick for solar energy collection pipe, includes body and heat-retaining material, its characterized in that, the body comprises outer tube (1), heat conduction fin (2), inner tube (3) and end cover (5), the heat-retaining material is phase change material (4).

2. The phase-change heat storage rod for the solar heat collection pipe according to claim 1, wherein the outer pipe (1) and the inner pipe (3) form a concentric sleeve, and the heat conducting fins (2) and the phase-change material (4) are filled between the outer pipe (1) and the inner pipe (3).

3. The phase-change heat storage rod for the solar heat collection pipe according to claim 1, wherein the outer pipe (1) and the inner pipe (3) are both metal pipes and have a wall thickness of 0.2mm to 2 mm.

4. The phase-change heat storage rod for a solar heat collection pipe according to claim 1, wherein the heat conductive fins (2) are closely attached to both the inside of the outer pipe (1) and the outside of the inner pipe (3).

5. The phase-change heat storage rod for a solar heat collection tube according to claim 1, wherein the inner diameter of the inner tube (3) is 8mm to 13 mm.

6. The phase-change heat storage rod for the solar heat collection pipe according to claim 1, wherein the sealing end caps (5) are arranged at two ends of a concentric sleeve formed by the outer pipe (1) and the inner pipe (3).