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Solid-state refrigeration method based on static-pressure driving of plastic crystal materials

A solid-state refrigeration and drive technology, applied in the field of materials, to achieve high compatibility

Inactive Publication Date: 2019-01-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above refrigeration principles all depend on the iron properties of solids, and the selection of material systems has certain limitations.

Method used

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  • Solid-state refrigeration method based on static-pressure driving of plastic crystal materials
  • Solid-state refrigeration method based on static-pressure driving of plastic crystal materials
  • Solid-state refrigeration method based on static-pressure driving of plastic crystal materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 20MPa refrigeration effect:

[0039] Put the refrigerant neopentyl glycol into the airtight high-pressure sample cell, and put the reference sample cell together into the sample cavity of the μDSC7 (produced by Setaram, France) microcalorimeter. Utilize the high-pressure gas control panel, feed nitrogen, keep the gas pressure constant at 1 atmospheric pressure (0.1MPa), heat from 293K to 335K with a heating rate of 1K / min, and record the heat flow data of the sample, such as Figure 7 shown in the first curve on the left. Next, increase the pressure of the gas to 20MPa, repeat the above process, and obtain data such as Figure 7 shown in the second curve. Convert heat flow data to entropy change data, such as Figure 8 shown. Subtract the two lines to get the entropy change when the pressure increases from 1 to 20MPa, and its maximum value is 150J kg -1 K -1 , the maximum adiabatic temperature change is 9K.

Embodiment 2

[0041] Saturation trend of cooling effect:

[0042] Put the refrigerant neopentyl glycol into the airtight high-pressure sample cell, and put the reference sample cell together into the sample cavity of the μDSC7 microcalorimeter. Use the high-pressure gas control panel to feed pure nitrogen, keep the gas pressure constant at 1 atmosphere (0.1MPa), heat from 293K to 335K at a heating rate of 1K / min, and record the heat flow data of the sample, such as Figure 7 shown in the first curve. Next, raise the pressure of the gas to 40MPa, 60MPa, 80MPa, and 100MPa, repeat the above measurement process, and obtain the data as follows: Figure 7 Shown in the third to sixth curves. Convert heat flow data to entropy change data, such as Figure 8 shown. Subtract the two lines to get the entropy change when the pressure increases from 0.1MPa to 40MPa, 60MPa, 80MPa, and 100MPa, and use the specific heat data to get the corresponding adiabatic temperature change. The maximum entropy cha...

Embodiment 3

[0046] Thermal Hysteresis:

[0047] Put the refrigerant neopentyl glycol into the airtight high-pressure sample cell, and put the reference sample cell together into the sample cavity of the μDSC7 microcalorimeter. Use the high-pressure gas control panel to feed pure nitrogen, keep the gas pressure constant at 1 atmosphere (0.1MPa), heat from 293K to 335K at a heating rate of 1K / min, and record the heat flow data of the sample, such as Figure 7 The first line (positive values) is shown. Then, lower the temperature to 293K at the same rate, and record the data as Figure 7 The first line (negative value) is shown. The extreme values ​​of the two are 317K and 302K respectively, with a thermal hysteresis effect of 15K. The thermal hysteresis at pressures of 40MPa, 60MPa, 80MPa, and 100MPa is also approximately 15K, such as Figure 10 shown.

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Abstract

The invention provides a novel efficient solid-state refrigeration method driven by pressure of plastic crystal materials. Plastic crystals are orientation ordered-unordered transformed organic molecular crystals or inorganical crystals with molecules or structural units. The plastic crystals are transformed in a solid state by a two-step melting process along with entropy change and enthalpy change comparable to the melting process. The phase change can be induced by lower pressure to generate huge pressure clamping effect. Taking the plastic crystal materials-neopentyl glycol as an example,the thermal insulation temperature change of 9 K is generated under the pressure of 20 MPa to achieve higher advantage compared with other pressure clamping effect material systems.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a high-efficiency solid-state refrigeration method driven by pressure using a class of materials called plastic crystals. Background technique [0002] Since the beginning of the 20th century, gas compression refrigeration technology has been widely used in civil equipment such as air conditioners and refrigerators as well as large industrial products. However, with the continuous improvement of people's awareness of environmental protection and energy saving, the shortcomings of this technology have gradually attracted the attention of the public and the refrigeration industry. The traditional gas compression refrigeration technology used a large number of chlorofluorocarbons (CFC) and hydrochlorofluorocarbons (HCFC) refrigerants that destroy the ozone layer in the early days, and their substitutes perfluorocarbons (FC) and hydrofluorocarbons (HFC) ) refrigerants generally have a high gr...

Claims

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Application Information

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IPC IPC(8): F25B23/00
CPCF25B23/00
Inventor 李昺张志东
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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