METHOD FOR COUNTERING ACCUMULATION OF ICING ON HEAT REGENERATOR INSTALLED IN AIR PURIFICATION UNIT Russian patent published in 2021 - IPC F24F11/41 F24F12/00 

FIELD: ventilation.

SUBSTANCE: method for countering the accumulation of icing on heat regenerator (1) installed in air purification unit (2) is proposed, wherein specified heat regenerator (1) is made with the possibility of transferring energy between first air flow (3) and second air flow (4). First air flow (3) contains first exhaust air (5) in a flow direction, and second air flow (4) contains first outdoor air (7) in a flow direction. Air purification unit (2) also contains exhaust fan (9) and fan (10) for intake air and control equipment (11). The method includes measuring the temperature of exhaust air (5), the moisture content of exhaust air (5), calculating the current temperature T_5dp of a dew point of exhaust air (5), determining the validation temperature T_v for the current operating mode and the temperature T_f of icing accumulation, where T_f=F (s1, s2, … s8), i.e. T_f is a function F depending on at least one of following parameters: s1 = type of heat regenerator (1); s2 = temperature efficiency; s3 = moisture content efficiency; s4 = moisture content of exhaust air (5); s5 = temperature of exhaust air (5); s6 = temperature of outdoor air (7); s7 = air speed for intake air (8); s8 = air speed for exhaust air (5). The method includes examining T_v relatively to at least one of two criteria K₁, K₂, where K₁: T_v≤T_f, K₂: T_v≤T_5dp+Δ₁°C, where Δ ₁≥0, and, when performing at least one of criteria K₁ or K₂, decreasing the efficiency η of heat regenerator (1) and/or increasing temperature T₇ of outdoor air (7) before heat regenerator (1). The validation temperature T_v is increased so much that at least one of criteria K₁, K₂ is no longer fulfilled.

EFFECT: preventing the accumulation of icing on the regenerator.

11 cl, 3 dwg