CN213983746U

CN213983746U - Outdoor portable phase change heat storage heating device in severe cold environment

Info

Publication number: CN213983746U
Application number: CN202020557788.7U
Authority: CN
Inventors: 陈超; 蔺洁; 张思琦; 张宇; 倪禹
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2020-04-15
Filing date: 2020-04-15
Publication date: 2021-08-17
Anticipated expiration: 2030-04-15

Abstract

An outdoor portable phase-change heat storage heating device in a severe cold environment relates to the technical field of phase-change energy storage, and is characterized in that: it comprises a container, a liquid injection port, a liquid injection port sealing cover and a solid-liquid phase change material; The material is injected through the injection port and sealed in the container. After injecting the solid-liquid phase change material in the solid state into the container, tighten the sealing cover of the liquid injection port to seal it; put the sealed phase change plate into the thermal storage tank for thermal storage; control the temperature of the thermal storage bath At 65-70℃, heat storage for 6-7 hours. When in use, place the portable phase change heat storage heating device that has completed heat storage in the installation slot under the outdoor seat or standing seat. The heat is released from the part and the heating is continued; after the heat release is completed, the phase-change heat storage heating device that has completed the heat release is recovered and placed in the heat-storage water bath for heat storage again.

Description

Outdoor portable phase change heat storage heating device in severe cold environment

Technical Field

The utility model relates to a phase change energy storage technical field, concretely relates to at outdoor local heating system of severe cold environment portability.

Background

In recent years, with the lifting of ice and snow sports in China, necessary local heating devices are provided for outdoor competition personnel, on-duty policemen, security personnel, workers and the like in severe cold environments, and the device has very important significance.

According to the 11-point scale quantitative index related to the evaluation of human subjective heat sensation in the society of heating, cooling and air conditioning engineers (ASHRAE), the subjective feeling of human on heat sensation can be classified into extreme cold (-5), very cold (-4), cold (-3), cold (-2), slightly cold (-1), neutral (0), slightly warm (+1), warm (+2), hot (+3), very hot (+4) and extreme heat (+ 5). Results of a large number of experimental studies by research team showed (fig. 1): 1) under the severe cold environment condition of lower than-14 ℃, even if people wear the clothing with the relatively low cold resistance, the temperature of fingers and toes is rapidly reduced to low temperature finally because the fingers and toes are far away from the core area, and the low temperature is difficult for people to stay for 1 hour in a sitting posture or a standing posture under the severe cold open-air environment condition; 2) even if the problem of hand warmth retention is solved under the severe cold environment condition of less than-14 ℃, the person still cannot stay for 1 hour in a sitting or standing posture because the temperature of the skin of the toes of the person is less than 17 ℃. Therefore, under severe cold environment conditions, in order to prolong the continuous stay time of outdoor personnel, it is a key influencing factor to provide effective and simple and easy local heating measures for outdoor personnel, especially the heating measures for feet.

The solid-liquid phase change material has the advantages of high energy storage density, approximately constant temperature in the heat storage and release process, small volume change, easy control of the process and the like; compared with sensible heat storage materials, the material has stable heat release temperature and small occupied space, and is widely valued by scientists in various countries.

Disclosure of Invention

The utility model aims at providing a novel phase change heat storage device that the outdoor portable part (including hand, foot, buttock etc.) heats under severe cold environmental condition.

The key technology of the utility model is to develop a portable phase-change heat storage heating device (figure 2), which comprises a plate-shaped container 1, a liquid injection port 2, a sealing cover 3 of the liquid injection port and a solid-liquid phase-change material 4.

The plate-shaped container 1 is made of HEPE (polyethylene plastics), and the basic geometric dimension of the container is 300-350 mm (length) x 250-300 mm (width) x 20-30 mm (height).

The solid-liquid phase change material 4 adopts a crystalline hydrated salt mixture, the phase change temperature is 43-54 ℃, the latent heat of phase change is 170-220 kJ/kg, and the density is 1200-1280 kg/m³。

After injecting the phase-change material 4 in a solid state into the container 1, screwing the sealing cover 3 of the liquid injection port to seal the liquid injection port; putting the sealed phase change plate into a heat storage water tank for heat storage; the temperature of the heat storage water bath is controlled to be 65-70 ℃, and the heat storage is carried out for about 6 hours. The heat medium water of the heat storage water tank can be heated by using the off-peak electricity or clean energy at night.

The working process of the utility model is as follows: when the portable phase change heat storage heating device is used, the portable phase change heat storage heating device which finishes heat storage is placed in the installation groove 5 (shown in figure 3) below the outdoor seat (or the standing seat), and the portable phase change heat storage heating device releases heat to the hip or the foot of a human body in a heat conduction mode through being directly contacted with the human body, so that approximately isothermal local heating can be carried out for 1.5-2 hours; after the heat release is finished, the phase change heat storage heating device which finishes the heat release is recycled and is put into the heat storage water bath for heat storage again.

Heat insulation material plates with thickness and heat conductivity coefficient lambda ranging from 0.03W/(m DEG C) to 0.05W and thickness ranging from 50mm to 80mm are adopted around and below the mounting groove 5; the inner diameter of the mounting groove can be designed according to the size of 2 portable phase change heat storage heating devices which are stacked up and down (seats) or placed side by side (standing seats).

The amount of the phase change material to be used in the portable phase change heat storage heating apparatus is calculated according to the expressions (1) to (3).

P_PCM×t＝m×h_PCM (2)

H_u,max＝hF_uΔT (3)

In the formula, P_PCM-can carry the heating power of the phase change heat storage heating device, W;

-average heat dissipation power, W, of the heater panel surface; h_u,max-maximum heat dissipation, W, of the heater slab in contact with the air; t is the continuous heating time s; m is the mass of the phase change material, kg; h is_PCMEnthalpy of phase change material (2.2X 10)⁵J/kg), J/kg; h is the comprehensive heat exchange coefficient, and h is 9.0-9.7W/(m)²·℃)；F_uThe surface area of the flat plate of the heater in contact with the air (i.e., the surface area of the heater other than the surface area in direct contact with the human foot), m²And the standing value range is 0.099-0.108 m²(ii) a Delta T is the difference between the temperature of the phase change material and the ambient air temperature, DEG C.

The device has the characteristics of convenient carrying, long continuous heating time, simple and convenient heat storage, high heat storage and release efficiency, low price, wide application range and the like, and the number of times of recycling exceeds 1000.

Drawings

FIG. 1a skin temperature and local heat sensation of a finger

FIG. 1b skin temperature and local heat sensation of toes

FIG. 2a top view of a portable phase change thermal storage heating device

FIG. 2b is a front view of a portable phase change thermal storage heating device

FIG. 3a is a schematic view of the installation of a seat-carried phase change thermal storage heating system

FIG. 3b is a schematic view of the installation of the station mat portable phase change thermal storage heating device

1-plate-like container, 2-pouring port, 3-pouring port sealing cap, 4-solid-liquid phase change material, 5-mounting groove

Detailed Description

To chongli gameTaking the area as an example, the outdoor temperature is-14 ℃ to-16 ℃, the foot heat dissipation power is 33W under the environment, and the foot sole area of the human body is 0.052m²(one standard adult male), the heater non-contact surface area F_uThe value is 0.103m²The comprehensive heat exchange coefficient is 9.7W/(m2℃) under the condition of no wind consideration, and then H at the moment is calculated_u,max69, the heating power P of the phase change heat storage device can be carried_PCMIs 102W; in order to meet the requirement of the winter Olympic conference competition duration, the continuous heating time is 90min and the surplus of 30min is considered, the total heating time of the phase-change material is 120min, the continuous heating time t is 120min, and the mass of the phase-change material is 3.4 kg.

2 portable phase change heat storage heating devices filled with 4 about 1.7kg of phase change materials are arranged in parallel in a station mat installation groove in a Chongli competition area, can provide heating load with heating power of 36-40W for feet for 90min, so as to maintain the skin temperature of the feet above 22 ℃, and provide good cold resistance and warm keeping measures for outdoor personnel.

Claims

1. The utility model provides an outdoor portability phase change heat accumulation heating system of severe cold environment which characterized in that: comprises a container, a liquid injection port, a sealing cover of the liquid injection port and a solid-liquid phase change material; the solid-liquid phase change material is injected from the injection port and then sealed in the container.

2. The apparatus of claim 1, wherein:

the container is made of polyethylene plastic materials, and the geometric dimension in the container is 300-350 mm in length, 250-300 mm in width and 20-30 mm in height.

3. The apparatus of claim 1, wherein:

the solid-liquid phase-change material adopts a crystalline hydrated salt mixture, the phase-change temperature is 43-54 ℃, the latent heat of phase change is 170-220 kJ/kg, and the density is 1200-1280 kg/m³。

4. The apparatus of claim 1, wherein: the dosage of the phase-change material in the portable phase-change heat storage heating device is calculated according to the formulas (1) to (3);

P_PCM×t＝m×h_PCM (2)

H_u,max＝hF_uΔT (3)

-average heat dissipation power, W, of the heater panel surface; h_u,max-maximum heat dissipation, W, of the heater slab in contact with the air; t is the continuous heating time s; m is the mass of the phase change material, kg; h is_PCM-enthalpy for phase change material, J/kg; h is the comprehensive heat exchange coefficient, and h is 9.0-9.7W/(m)²·℃)；F_uSurface area of contact between flat plate surface of heater and air, m²And the standing value range is 0.099-0.108 m²(ii) a Delta T is the difference between the temperature of the phase change material and the ambient air temperature, DEG C.

5. The apparatus of claim 1, wherein:

heat insulation material plates with thickness, heat conductivity coefficient lambda being 0.03-0.05W/(m DEG C) and thickness being 50-80 mm are adopted at the periphery and below the mounting groove; the inner diameter of the mounting groove is 2 portable phase change heat storage heating devices which are stacked up and down or placed side by side.