Ordinary time and epidemic period combined adjustable working condition variable-channel operation air handling unit and control mode thereof

Abstract

The invention discloses an ordinary time and epidemic period combined adjustable working condition variable-channel operation air handling unit and a control mode thereof, and belongs to the field ofenergy utilization technologies and air conditioning. The unit is composed of an air feeder, two evaporators, an air return valve, two fresh air valves and three bypass ventilation valves. During refrigeration operation at ordinary time, one air return valve and one fresh air valve are opened, fresh air and return air are mixed in proportion and then are subjected to heat and humidity exchange through the two evaporators at the same time to achieve the purposes of cooling and dehumidification, and the two evaporators are arranged in parallel relative to airflow by adjusting different on-off states of the three bypass ventilation valves; when an epidemic situation happens, the air return valve is closed, the two fresh air valves are opened at the same time, and the rotating speed of a draught fan is adjusted through a frequency converter, so that the air volume can be reduced to the appropriate air volume; and in order to increase the enthalpy difference of air treatment, all fresh airenters the air handling unit and sequentially passes through the two evaporators, the two evaporators are arranged in series relative to airflow by adjusting the different on-off states of the three bypass ventilation valves, and the air is conveyed into a room after being treated to a required heat and humidity state point.

Description

technical field [0001] The invention relates to an air treatment unit, in particular to an air treatment unit combined with anti-epidemic and adjustable working condition and variable channel operation and its control method. Background technique [0002] The COVID-19 novel coronavirus pneumonia that occurred around the world in 2019-2020 made us realize that the central air-conditioning air handling unit may contribute to the indoor spread of the virus; it made us reconsider the need for a new air handling unit that can be used in normal times Energy-saving operation is performed most of the time, and it can avoid becoming a channel for virus transmission when the epidemic comes, and protect people's health. 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, infectious viruses have the opportunity to spread indoors, endangering public health and safety. In infectious ward...

AI Technical Summary

Problems solved by technology

In infectious wards, we generally use fresh air to operate, which can dilute indoor harmful substances and discharge them outside, significantly improving indoor air quality; however, there are many problems in the simple conversion of return air and fresh air by the same air handling unit: 1. The same air volume is used to deal with fresh air, resulting in excessive positive pressure in the room, resulting in increased discomfort for personnel and poor closing of doors and windows; 2. The exhaust air is directly discharged outside, and the cooling capacity is wasted; 3. The operation of fresh air conditions The energy consumption of the fresh air treatment is greatly increased, and the energy consumption of the fresh air condition for processing the same air volume is more than double that of the return air condition

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