Air energy heat pump heat recovery independent fresh air unit

Abstract

The invention discloses an air energy heat pump heat recovery independent fresh air unit, and relates to heat recovery fresh air processing equipment. The fresh air unit comprises a fresh air channel,an air exhausting channel, a bypass ventilation channel and an outdoor air channel, wherein the fresh air channel is arranged in a box body and is used for indoor air supply, the air exhausting channel is used for indoor air return, the bypass ventilation channel is used for supplying air to the room in transition seasons, and the outdoor air channel is used for introducing outside air to supplycold and heat sources; a fresh air fan, a filter and a first heat exchanger are arranged in the fresh air channel in the indoor air supply direction; an air return fan and a third heat exchanger are arranged in the air exhausting channel in the air exhausting direction; the bypass ventilation channel communicating with an air supply port for fresh air entering the room is connected to the fresh air channel in series, and a second heat exchanger and an air exhaust fan are arranged in the outdoor air channel; and a compressor is connected with the third heat exchanger, the first heat exchanger and the second heat exchanger in series through a four-way reversing valve. The fresh air unit can be used for cold regions, and has the advantages that the heat recovery efficiency is high, the cold and hot sources are independent, the running temperature range is wide, and the full-year efficient energy-saving operation is achieved.

Description

technical field [0001] The invention relates to heat recovery fresh air processing equipment, in particular to a double heat exchanger air energy heat pump heat recovery fresh air unit used in severe cold regions. It belongs to the technical field of air energy heat pumps. Background technique [0002] my country's buildings should meet energy-saving requirements, and the airtightness of various buildings, especially public buildings, has been greatly improved. In order to prevent the emergence of sick buildings, the introduction of indoor fresh air needs to be solved urgently. The following limitations exist: [0003] 1. In severe cold and cold areas, the outdoor temperature is low in winter, and the cold air temperature can reach -30°C when the temperature is low. Simple and unorganized introduction of outdoor fresh air from the window will cause a serious decline in indoor comfort and a sharp increase in building energy consumption, which will lead to energy waste. The p...

AI Technical Summary

Problems solved by technology

[0003] 1. In severe cold and cold areas, the outdoor temperature is low in winter, and the cold air temperature can reach -30°C when the temperature is low. Simple and unorganized introduction of outdoor fresh air from the window will cause a serious decline in indoor comfort and a sharp increase in building energy consumption, which will lead to energy waste. The phenomenon is serious and seriously violates the energy saving requirements

[0004] 2. In recent years, outdoor air quality has declined sharply. When buildings introduce outdoor fresh air in an unorganized manner, the direct introduction of fresh air without treatment will aggravate indoor air pollution, which does not meet the requirements for comfort and indoor air quality.

[0005] 3. The existing independent fresh air system generally adopts electric heating in winter, which consumes a lot of energy, and cannot bear a certain indoor load in special occasions such as hospitals. The energy consumption is extremely unreasonable, the operating cost is high, and there is no cooling function in summer. run

[0006] 4. The fresh air unit used together with centralized or semi-centralized air conditioners usually does not have a heat recovery device, and the heating and cooling system of the air conditioner unit is complicated due to the addition of fresh air, which not only increases the energy consumption of the building, but also makes the air conditioning system more complicated. The gain outweighs the gain

[0007] 5. Further, a small number of fresh air fans are equipped with heat recovery devices, but whether they use heat exchangers or full heat recovery runners, the heat recovery efficiency is very low, and the exhaust air heat cannot be fully recovered, and the heat exchanger has a heat exchange core The contradiction between body material and heat exchange efficiency, and the problem of complex structure in total heat recovery

[0008] 6. For severe cold and cold areas, if the heat recovery device of the ordinary heat recovery fresh air unit adopts a metal heat exchanger to achieve higher heat exchange efficiency, due to the low temperature of the outdoor fresh air, frosting of the heat exchanger will inevitably occur; in order to avoid If a paper core heat exchanger is used for frosting, the heat exchange efficiency will be greatly reduced, and the heat recovery value will not be high

[0009] To sum up, buildings in severe cold and cold areas urgently need to introduce fresh, healthy fresh air that meets indoor air quality, but none of the fresh air systems or fresh air treatment equipment currently on the market can be used in severe cold and cold areas

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