Phase-change heat-storage energy-saving electric water heater

A phase-change heat storage and electric water heater technology, which is applied to water heaters, fluid heaters, heat exchange materials, etc., can solve the problems of inconspicuous energy-saving advantages, low heating water efficiency, and inconspicuous energy-saving, etc., to reduce energy consumption Low energy consumption, high heat utilization efficiency and low cost

Inactive Publication Date: 2011-01-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with non-phase-change products, these built-in phase-change water heaters have no obvious energy-saving advantages, and have not been promoted so far.
The reason, on the one hand, is that the built-in phase change material compresses the volume of hot water, and the specific heat of water is very high. In a wide temperature range, the sensible heat stored in water can be compared with the latent heat, so energy saving is not a problem. Not obvious; on the other hand, the thermal conductivity of phase change materials such as paraffin is not high, and the efficiency of heating water completely relying on phase change materials is very low

Method used

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Examples

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Effect test

example 1

[0016] In a storage-type electric water heater with a capacity of 40L (the inner diameter of the water tank is 0.336m, and the length of the cylinder is 0.50m), a composite insulation layer containing phase change materials is used, and the thickness is 0.045m. The phase change material is n-octadecane, the phase change temperature is 62.8°C, the phase change enthalpy is 244J / g, and the density is 0.910g / m 3 , the phase change heat storage layer is made by macro capsule technology, and it is placed close to the outside of the liner, with a thickness of 0.019m. The polyurethane foam heat insulation layer is prepared by integral foaming technology, which is filled with the gap between the phase change heat storage layer and the shell, and the thickness is 0.026m, that is, the thickness ratio of the phase change heat storage layer to the polyurethane foam heat insulation layer is 0.73. The water heater was tested in accordance with the relevant test conditions stipulated in the "...

example 2

[0018] In a storage-type electric water heater with a capacity of 50L (the inner diameter of the water tank is 0.336m, and the length of the cylinder is 0.605m), a composite insulation layer containing phase change materials is used, and the thickness is 0.035m. The phase change material is 1-hexadecanoic acid, the phase change temperature is 64°C, the phase change enthalpy is 200J / g, and the density is 0.850g / m 3 , the phase-change heat storage layer is made by macrocapsule technology, and it is placed close to the outside of the liner with a thickness of 0.015m. The polyurethane foam heat insulation layer is prepared by integral foaming technology, which is filled with the gap between the phase change heat storage layer and the shell, and the thickness is 0.020m, that is, the thickness ratio of the phase change heat storage layer to the polyurethane foam heat insulation layer is 0.75. The water heater was tested according to the relevant test conditions described in Example ...

example 3

[0020] In a storage-type electric water heater with a capacity of 60L (the inner diameter of the water tank is 0.336m, and the length of the cylinder is 0.71m), a composite insulation layer containing phase change materials is used, and the thickness is 0.035m. Among them, the phase change material is n-triundecane, the phase change temperature is 65°C, the phase change enthalpy is 252J / g, and the density is 0.910g / m 3 , the phase change heat storage layer is made by macro capsule technology, and it is placed close to the outside of the liner, with a thickness of 0.013m. The polyurethane foam heat insulation layer is prepared by integral foaming technology, which is filled with the gap between the phase change heat storage layer and the shell, and the thickness is 0.022m, that is, the thickness ratio of the phase change heat storage layer to the polyurethane foam heat insulation layer is 0.59. The water heater was tested according to the relevant test conditions described in E...

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Abstract

The invention discloses a phase-change heat-storage energy-saving electric water heater and belongs to the technical field of household appliances. The water heater comprises a shell, an insulating layer, an inner tank, a magnesium rod, a sewage draining exit, a hot water outlet, a cold water inlet, a leakage protection switch, a temperature controller and an electric heating pipe, wherein the insulating layer between the shell and the inner tank is a composite insulating layer which consists of a polyurethane foam heat-preservation layer and a phase-change heat storage layer; the energy saving of a water storage electric water heater is realized by the double insulation of heat storage and heat insulation; the polyurethane foam heat-preservation layer is positioned between the shell and the phase-change heat storage layer which is tightly attached to the outer side of the inner tank; the composite insulating layer is 25 to 45mm thick; and the thickness ratio of the phase-change heat storage layer to the polyurethane foam heat-preservation layer is 0.4 to 0.8. The electric water heater has the advantages of capability of improving the energy saving level in a water storage and heat preservation process and reducing power consumption, high heat utilization ratio, safety and low cost, and is environmentally friendly and convenient for operation.

Description

technical field [0001] The invention belongs to the technical field of household appliances, in particular to a phase-change heat storage and energy-saving electric water heater. Background technique [0002] With the increasingly severe energy situation, energy-saving technology has become the focus of competition among major water heater brands. At present, the mainstream electric water heater is water storage water heater, and its energy saving mainly includes two aspects, one is the energy saving in the heating process, and the other is the energy saving in the heat preservation process. The former accounts for a very small proportion of the water heater energy consumption, while the latter accounts for 97 %above. Therefore, the core focus of energy-saving design in the water heater industry is mainly on the innovation of the insulation layer. [0003] At present, the heat preservation of storage-type electric water heaters mainly relies on polyurethane foam materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24H1/20C09K5/06
CPCY02P20/10
Inventor 李建强徐哲马炳倩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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