Fresh air handling unit capable of being accurately regulated and controlled and regulation and control method
A technology for fresh air units and fresh air fans, applied in heating methods, ventilation systems, mechanical equipment, etc., can solve the problems of high energy consumption of fresh air units and difficult to control accurately, and achieve the effect of reducing impact, ensuring stability, and prolonging use.
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Embodiment 1
[0033] Such as figure 1 As shown, a fresh air unit that can be precisely controlled includes a fresh air casing with a housing chamber inside; a fresh air inlet 1 and a fresh air outlet 11 are respectively provided on two opposite surfaces of the fresh air casing along the air circulation direction; There are filter assembly, fan 4, heat pipe heat exchange assembly, surface cooler 6 and temperature adjustment coil 10; the heat pipe heat exchange assembly has a U-shaped structure, and the medium inside the heat pipe heat exchange assembly circulates through gravity; the heat pipe heat exchange assembly includes The heat pipe pre-cooling section 5 and the heat pipe reheating section 7 are located at the bottom of the heat pipe pre-cooling section 5 and the heat pipe reheating section 7, and are used to circulate the in-out circulation pipeline of the medium; the surface cooler 6 is located between the heat pipe pre-cooling section 5 and the Between the heat pipe reheating sectio...
Embodiment 2
[0040] The air volume of residential fresh air units is generally small, usually at 200m 3 / h-400m 3 / h, the temperature drop of the supply air that needs to be regulated by the thermostat coil 10 is about 3°C-10°C. Take the air volume M as 300m 3 / h as an example, the temperature drop is 5°C to calculate the required cold water flow.
[0041] Q=MC 1 Δt 1 (1)
[0042] In the formula (1), Q is the heat exchange rate, and M is the air volume of 300m 3 / h,C 1 is the specific heat capacity of air, the value is 1.005KJ / (kg K); t 1 It is a temperature drop of 5°C; the heat transfer can be calculated to be 0.5KW.
[0043]Q = GC 2 Δt 2 (2)
[0044] In formula (2), G is water flow kg / s, C 2 The specific heat capacity of water is 4.18KJ / (kg K); △t 2 It is the temperature difference between the inlet and outlet water, and the value is 5°C. Combined with formula (1), it can be calculated that the outlet water flow rate is 0.024kg / s, and the water flow rate is 0.086m after ...
Embodiment 3
[0056] The control method of the fresh air unit that can be precisely controlled includes the following steps:
[0057] S1. Turn on the blower fan 4, and conduct each pipeline (including the inlet pipeline and the outlet pipeline respectively connected to the top of the surface cooler 6 and the temperature adjustment coil 10), the temperature adjustment controller receives the temperature According to the temperature input by the sensor, the temperature between the fresh air inlet 1 and the filter assembly is T1, and the temperature between the thermostat coil 10 and the fresh air outlet 11 is T2;
[0058] S2. The temperature adjustment controller processes the incoming temperature T2 and the preset target temperature T0, calculates the temperature deviation and temperature deviation rate of the air supply, and controls the temperature adjustment coil according to the obtained air supply temperature deviation and temperature deviation rate 10 switch of valve 9 on the inlet pip...
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