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Anti-freeze flat plate solar collector and design method thereof

A technology of solar panels and heat collectors, applied in the field of solar heat collectors, to achieve the effects of preventing solid-liquid separation, uniform temperature distribution, and slowing down the start-up speed

Inactive Publication Date: 2015-01-07
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the analysis of the antifreeze function of the heat collector, the above two technologies still have the following problems: 1. There is no method for calculating the amount of phase change material used; 2. The heat collector needs to be placed on an inclined When the energy material is solidified, the solid phase material will sink, and solid-liquid separation will occur, making the temperature distribution of the heat-absorbing plate severely uneven and prone to partial freezing; 3. The phase change temperature of the phase change energy storage material used is relatively high
When antifreezing, the temperature of the heat absorbing plate is relatively high, and the heat loss is large; 4. The conditions of extreme weather and continuous cloudy and snowy days are not considered

Method used

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  • Anti-freeze flat plate solar collector and design method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 1. According to the local meteorological conditions, determine the design antifreeze duration T 0 and design ambient temperature mean T a0 .

[0045] Taking Lanzhou as an example, there are 143 icy days with daily minimum temperature below 0°C. Figure 5 The anti-freezing time t of the icing day and the average temperature T of the environment during the no-sunlight period are given a . When K 1 and K 2 When the value is 0.9, the corresponding design antifreeze duration t 0 and the average temperature T of the environment during the time without sunlight a0 They are 18h and 264.6K respectively.

[0046] 2. Calculate the thickness of the phase change energy storage material according to formula (1)

[0047] The density of the phase change energy storage material is 1.47g / cm 3 , the phase change point is 5°C, the latent heat of phase change is 123.3KJ / (kg K), the liquid specific heat capacity is 14.38KJ / (kg K), the solid specific heat capacity is 5.56KJ / (kg K), t...

Embodiment 2

[0055] On the basis of Example 1, if the phase change point of the phase change energy storage material 12 is 8°C and other data remain unchanged, then the thickness of the phase change energy storage material 12 is 11.9mm, and the corresponding phase change energy storage plate bottom plate The height is changed to 13.9mm.

Embodiment 3

[0057] On the basis of Example 1, the Lanzhou area is changed to the Xi'an area, and there are 94 icy days in which the daily minimum temperature is lower than 0°C. Figure 6 The anti-freezing time t of the icing day and the average temperature T of the environment during the no-sunlight period are given a . When K 1 and K 2 When the value is 0.9, the corresponding design antifreeze duration t 0 and the average temperature T of the environment during the time without sunlight a0 They are 16h and 268.6K respectively. Then the thickness of the phase change energy storage material 12 is 5.9 mm, and the height of the lower bottom plate of the phase change energy storage plate is changed to 7.9 mm.

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Abstract

The invention discloses an anti-freeze flat plate solar collector and a design method thereof. The design method is characterized by determining the thickness of phase change energy storage material through the local meteorological data. According to the anti-freeze flat plate solar collector, phase change energy storage plates are regularly and tightly arrayed between a heat absorbing plate and an insulated layer; a baffle plate is arranged in each phase change energy storage plate along the length direction; a temperature sensor and a temperature controller are arranged at the upper and lower surfaces of the phase change energy storage plate at the solar collector outlet. When the temperature of the heat absorbing plate is lowered to the phase change temperature of the phase change energy storage material, energy storage materials in the phase change energy storage plates generate phase change and release latent heat to prevent the temperature reduction so as to achieve freeze resistance. When meeting extreme weather, a temperature controller starting pump can be used for resisting freeze forcibly and circularly. The anti-freeze device is simple in structure, safe and reliable, the heat loss is low, and the damage to the flat plate solar collector due to icing can be avoided effectively.

Description

technical field [0001] The invention belongs to the technical field of solar heat collectors, and relates to a frost-resistant solar flat plate heat collector and a design method thereof. Background technique [0002] Regarding the antifreeze problem of solar flat panel collectors, the methods currently used in the engineering field mainly include double-loop systems and forced circulation methods, and there are many related studies. However, there are few studies on antifreezing by changing the structure of heat collector itself, which does not completely depend on external conditions. Related patents include: invention patent "vacuum flat solar heat collector" (patent application number 200710303714.X), invention patent "antifreeze flat solar collector" (patent application number 201210090849.3), invention patent "a metal Finned energy storage solar flat panel heat collector" (patent application number 200810123872.1), invention patent "a phase change heat storage solar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/34F24J2/40
CPCY02E10/40
Inventor 王智平赵静路阳王克振陆鑫张楠寇宗丽
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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