Temperature and humidity control system of medium-temperature water air conditioner, air conditioner and control method

Abstract

The invention provides a temperature and humidity control system of a medium-temperature water air conditioner, the air conditioner and a control method, and relates to the technical field of air conditioners. The technical problem that the dehumidification capacity of the tail end of a medium-temperature water air conditioner system is poor is solved. The temperature and humidity control device of the medium-temperature water air conditioner comprises a cold and heat source, a fresh air device and a tail end building, and a tail end heat exchanger is arranged in the tail end building; a first heat exchanger and a heat pump unit are arranged in a fresh air device fluid channel; and two water circulation branches are arranged between an outlet and an inlet of the cold and heat source in parallel, and multi-stage utilization of circulating water is achieved. Through multi-stage utilization of cold and heat source circulating water, the dehumidification capacity of the medium-temperature water air-conditioning system is improved; the cold source cold water is used for cooling the evaporation heat exchanger of the heat pump unit, no extra cold source needs to be added, and therefore system investment is saved; and through multi-stage utilization of circulating water, the equipment performance of cold and heat sources is fully exerted, and the energy efficiency of the air conditioning system is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a temperature and humidity control system, an air conditioner and a control method for a medium temperature water air conditioner. Background technique [0002] With the proposal of green energy-saving goals such as "nearly zero energy consumption" and "carbon neutrality", the development of air-conditioning systems has also ushered in great momentum and innovation. Compared with the traditional chilled water supply temperature of 7°C, the return water temperature of 12°C, and the temperature difference between supply and return water of 5°C, the set value of the chilled water supply temperature is increased to above 7°C (generally 10-12°C). Increasing the temperature difference of the return water to 6 to 8°C can significantly improve the energy efficiency of the refrigeration host, but this will result in a decrease in the dehumidification capacity of the air condition...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a temperature and humidity control system, air conditioner and control method of a medium temperature water air conditioner, at least to solve the technical problem of poor dehumidification capacity at the end of the medium temperature water air conditioner system in the prior art

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