Energy recovery double-cold-source high-enthalpy-difference energy storage fresh air handling unit and control method thereof

Abstract

The invention discloses an energy recovery double-cold-source high-enthalpy-difference energy storage fresh air handling unit. The unit comprises an air conditioning system, a heat pump system and an energy storage system; the air conditioning system includes a fresh air machine, an exhaust fan and an air total-heat recoverer; the heat pump system includes an annular close-connected compressor, a condensation heat recoverer, a condenser, an expansion valve, a direct expansion evaporator and an energy storage evaporator; the energy storage system includes an energy storage tank and a high-entralpy-difference surface cooler connected with each other; and the condensation heat recoverer, the direct expansion evaporator and the high-entralpy-difference surface cooler are respectively arranged on a fresh air channel. The unit largely reduces the operation cost by using the peak-valley price, provides low-temperature frozen water needed by deep dehumidification, increases the energy-efficiency ratio of the heat pump system through recovering the condensation heat, can improve the quality of indoor air through low-temperature cold sources and increment of the fresh air quantity, reduces the fresh air conditioning energy consumption by exhausting and heat recovery, and facilitates to save the energy and reduce the environmental pollution.

Description

technical field [0001] The invention relates to an energy storage fresh air conditioner, in particular to an energy recovery type double cold source large enthalpy difference energy storage fresh air unit. 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. Increase the volume of fresh air (or adopt the operation mode of fresh air), which can dilute indoor harmful substances and discharge them outdoors, significantly improving indoor air quality; but on the other hand, the energy consumption of fresh air accounts for 30-40% of the energy consumption of the entire air conditioning system , the increase in fresh air volume greatly increases the energy consumption of fresh air treatment; in addition, the air treatment methods currently use ordinary 7 / 12°C chilled wa...

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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, the regeneration process requires a lot of energy consumption; another dehumidification method is the solution air conditioner in which the air directly contacts with the salt solution. After several years of promotion, a large number of problems have begun to appear: the equipment cost is extremely high; The solution is highly corrosive and has a high failure rate, making it extremely difficult to popularize

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