Self-cooling type solid desiccant cooling dehumidification air-conditioning system

Abstract

The invention discloses a self-cooling type solid desiccant cooling dehumidification air-conditioning system. The air-conditioning system comprises a cooling dehumidification system and a heating regeneration system which are connected with each other. Dehumidifying heat exchangers formed by enabling solid dehumidifying materials to be attached to surfaces of finned tube type heat exchangers independently performing sensible heat exchange traditionally are adopted in the cooling dehumidification system and the heating regeneration system. Dehumidifying turning wheels are replaced by the dehumidifying heat exchangers. In the dehumidification process, chilled water generated by regenerating evaporating cooling is led into the dehumidifying heat exchangers, so that a self-cooling type low temperature inner heat source is formed, and cooling is carried out in the desiccant dehumidification process; in the regenerating process, hot water generated through low-grade heat energy serves as a heating inner heat source to be led into the desiccant desorption process; and by switching the dehumidification process and the regenerating process, thermodynamic cycle for continuous refrigeration is achieved. Compared with a dehumidifying turning wheel system, the self-cooling type solid desiccant cooling dehumidification air-conditioning system not only has the advantages of being small in size and low in cost, but also can achieve the self-cooling type cooling dehumidification process, and the efficiency of the whole system is greatly improved.

Description

technical field [0001] The invention relates to a system in the technical field of refrigeration and air conditioning, in particular to a self-cooling solid desiccant cooling and dehumidification air conditioning system. Background technique [0002] In recent years, with the improvement of people's living standards and the frequent appearance of extreme environments around the world, the widely used traditional vapor compression heat pump air-conditioning system has become the main source of electricity consumption in the whole society. One of the main reasons for the high energy consumption of the traditional compression air conditioning system is that the system adopts the air treatment method of condensation and dehumidification to focus on the sensible heat and latent heat load. The solid desiccant air-conditioning technology uses natural working fluid-water as the refrigerant. Based on the adsorption of water vapor by the solid desiccant, the latent heat load in the ai...

AI Technical Summary

Problems solved by technology

Due to the limitations of the structure of the desiccant wheel, during the dynamic dehumidification process of the system, the equilibrium adsorption temperature between the desiccant and the treated air increases due to the release of adsorption heat, and the moisture absorption performance of the desiccant decreases while increasing the heat between dehumidification and regeneration. Poor moisture transfer potential, increased regeneration temperature for cycle requirements, and difficult to improve overall cycle performance

On the other hand, the humidification and cooling process of the direct evaporative cooler puts forward higher requirements on the dehumidification capacity of the cycle, resulting in an increase in the regeneration temperature, and the overall system performance is not high; while the limit minimum temperature of the indirect evaporative cooling of the cooling tower can only reach the temperature of the outdoor air Wet bulb temperature, difficult to achieve high sensible heat load handling capacity

[0004] After searching the public literature of the prior art, it was found that in order to solve the above problems, the Chinese patent application No. 200710045901.2 "Two-stage dehumidification and air-conditioning device with low-grade heat source" patent is a two-stage dehumidification through inter-stage cooling. The process design realizes the solid dehumidification process with intermediate cooling. Although the two-stage dehumidification performance has been improved compared with the traditional system, the system cannot achieve internal cooling dehumidification and the sensible heat load processing capacity is still insufficient; Chinese patent application number is 201110356517.0 "Composite air-conditioning system combining air source heat pump and dehumidification wheel" and "air conditioning system coupled with high-temperature heat pump and dehumidification wheel and high-temperature heat pump" with Chinese patent application number 200810052297.0, both of which are processed through a compression heat pump cycle Sensible heat load and provide part of the regenerative heat of the runner, although the sensible heat load handling capacity of the system has been improved, but because the system still uses the traditional compression air conditioner, the system cannot overcome the use of refrigerants that have an impact on the environment, and the system itself It has the disadvantages of large volume, complicated structure and high cost

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