Thermally driven absorption refrigerating system based on semipermeable membrane

Abstract

The invention discloses a thermally driven absorption refrigerating system based on the semipermeable membrane. The refrigerating system comprises a generator, a first permeable membrane, a condenser, a first throttling element, an evaporator, a second permeable membrane, an absorber, a cooling coil, a second throttling element, a solution pump and a heating coil. In the system of the invention, the semipermeable membrane can be selected according to the range of the temperature without any additional part so that the volume miniaturization of the system can be realized and the aim of energy-saving can be achieved; and a non-toxic and environmentally friendly working medium with excellent thermal property can be used, the operation pressure is appropriate, the complicated mechanical evacuating device or automatic evacuating device are not required, and the system is easy to operate, maintain and control.

Description

technical field [0001] The invention relates to a heat-driven absorption refrigeration system, in particular to an absorption refrigeration system that consistently utilizes low-grade heat sources such as waste heat and solar energy, and has the adsorption-diffusion characteristics of a semi-permeable membrane. Background technique [0002] At present, China's energy structure is dominated by fossil energy, which is a non-renewable energy source. On the one hand, by 2020, my country's GDP will quadruple, but the energy consumption per unit of GDP can only be doubled, so we must vigorously advocate energy conservation; Environmentally harmful substances, such as energy depletion, global warming and air pollution, have become quite serious. Under such a background, making full use of low-grade energy, such as a large amount of industrial waste heat, waste heat, solar energy, biomass energy and other energy sources has attracted great attention. For this country, the strategic...

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Problems solved by technology

[0004] 1. The current absorption refrigeration system requires a relatively large boiling point difference between the absorbent and the refrigerant, which greatly affects the selection range of the absorption working medium pair;

[0005] 2. At present, the commonly used working fluid pairs of absorption refrigeration systems include lithium bromide aqueous solution and ammonia solution, both of which have corrosion and toxicity problems. In addition, the ammonia solution requires a rectifier, and the lithium bromide aqueous solution also has problems such as crystallization, which to a certain extent limits its application;

[0006] 3. The refrigeration temperature range produced by the current simple absorption refrigeration system is also relatively limited. For example, if hydrofluorocarbon and DMF are used, the temperature of the heat source should not be too high, otherwise the refrigerant entrains the absorbent more seriously. To obtain a relatively low temperature zone or use relatively high waste heat, the absorption refrigeration system needs to be improved, such as adding a rectification device, which complicates the system;

However, this not only complicates the piping installation of the system, increases the maintenance cost and maintenance amount, but also increases the initial investment.

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