Two-stage dual-dehumidification-evaporator and dual-dehumidification-condenser dehumidification heat pump system and method

Abstract

The invention provides a two-stage dual-dehumidification-evaporator and dual-dehumidification-condenser dehumidification heat pump system which comprises a closed refrigerating fluid system. The closed refrigerating fluid system comprises a low-temperature-side compressor, a four-way reversing valve, a first low-temperature-side dehumidification heat exchanger, a second low-temperature-side dehumidification heat exchanger, a low-temperature-side throttle device, a high-temperature-side compressor, a first three-way reversing valve, a second three-way reversing valve a high-temperature-side throttle device, a first high-temperature-side dehumidification heat exchanger and a second high-temperature-side dehumidification heat exchanger. The invention further provides a two-stage dual-humidification temperature increase and decrease method. In the system and the method, the two dehumidification evaporators / condensers connected in parallel at different evaporation / condensation temperatures are adopted, and treatment air sequentially flows through the high-temperature dehumidification evaporator and the low-temperature dehumidification evaporator. Compared with the prior art, according to the system and the method, the circulating switching time is prolonged, reliability and economic performance are both improved to a certain degree, and in addition, multi-mode operating can be achieved through switching.

Description

technical field [0001] The invention relates to a system in the field of solid dehumidification air-conditioning heat pump technology, in particular to a two-stage dehumidification heat pump system with double dehumidification evaporators and double dehumidification condensers. Background technique [0002] Decoupling solid dehumidification air-conditioning technology uses desiccant to deal with the latent heat load in the air, while the sensible heat load is dealt with by natural cold source or traditional compression refrigeration system. The system realizes the separate processing and independent control of sensible heat load and latent heat load. It overcomes the limitation of centralized processing load of compression air-conditioning technology. However, the heat of adsorption released by the dehumidification material during the solid dehumidification process will not only increase the sensible heat load to be treated in the follow-up, but also cause an increase in the...

AI Technical Summary

Problems solved by technology

However, when the desiccant on the surface of the desiccant is adsorbed and saturated, the low-temperature internal cooling source will cause condensation on the surface of the desiccant, and the liquid water produced will have a great adverse effect on the physical properties of the coated desiccant and subsequent regeneration. Instability and decline in the overall cycle performance

[0003] After searching the public literature of the prior art, it was found that in order to solve the above problems, Comfortable, high-efficiency heat pump with desiccant-coated, water-sorbing heat exchangers (2017, 7, 40437) published by Y.D.Tu et al. on Scientific Reports passed control The switching time of evaporative dehumidification and condensation regeneration is used to avoid condensation. However, frequent switching will cause the thermal performance of the overall cycle to be in a dynamic alternation of cold and hot. At the same time, the thermal resistance of the metal base with large heat capacity will lead to the adsorption and desorption of the desiccant. capacity reduction, resulting in a decrease in overall cycle performance

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