Double-cold-source heat pump total heat recovery humidity regulating and temperature controlling fresh air unit and control method thereof

Abstract

The invention discloses a double-cold-source heat pump total heat recovery humidity regulating and temperature controlling fresh air unit and a control method thereof, and belongs to the fields of energy utilization technology and air conditioning. The fresh air unit comprises an air exhaust part, a fresh air treatment part, a surface heat exchanger and a heat pump system, wherein the heat pump system comprises a compressor, a condenser, a condensation heat recoverer, an evaporator and a throttling component. The fresh air unit utilizes indoor low-temperature and low-humidity exhausted air to exhaust condensation heat of a refrigeration system in summer, and utilizes indoor high-temperature and high-humidity exhausted air to exhaust evaporation cold energy of the refrigeration system in winter. The surface heat exchanger aims at performing pre-cooling and pre-dehumidification to high-temperature and high-humidity fresh air through chilled water dew point temperature. The heat pump system provides required cold energy and heat as well as the lower dew point temperature that the chilled water is unaccessible to for the fresh air treatment part.

Description

technical field [0001] The invention relates to a heat pump full heat recovery fresh air treatment unit, in particular to a double cold source heat pump full heat recovery humidity adjustment temperature control fresh air unit and its control method. Background technique [0002] Most of the air-conditioning systems in civil buildings in my country adopt the mixed mode of fresh return air. Since most of the air circulates indoors, pollutants cannot be discharged outdoors quickly, which is harmful to human health. Increasing the fresh air volume (or adopting fresh air operation mode) can dilute indoor harmful substances and discharge them outdoors, significantly improving indoor air quality. But on the other hand, the increase of fresh air volume greatly increases the energy consumption of fresh air processing. In addition, chilled water or direct evaporation dehumidification methods are mostly used for air treatment. This air-conditioning method has the following disadvanta...

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Problems solved by technology

However, the essence of the low heat utilization efficiency of the rotary dehumidifier is that the two processes of dehumidification and regeneration are isenthalpic processes rather than isothermal processes. The humidity and temperature differences between the surface of the rotor and the air are very uneven, resulting in a large Irreversible loss, and there is also cross-contamination between fresh air and exhaust air

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