In the greenhouse planting project, since the lowest temperature in the outdoor environment is generally in the second half of the night to the early hours, the temperature of the heat transfer is the largest, so the temperature of the cultured constant temperature commercial heat pump heating greenhouse is generally used as the heat loss of heating. Because it is night, solenoid heat, heat, illumination, equipment operation, etc. are ignored. No ventilation is needed at night, will not open the window frequently, and the heat loss of ventilation and opening and windows is ignored.
Temperature load calculation considerations grown under normal conditions include:
(1) After the roof, ground, wall, door, window, etc., the heat, the heat, the radiation, and the radiation are set to U1;
(2) Heating through the door, window, and enclose the heat of the gap to penetrate the heat required to enter the air, set to U2;
(3) The temperature of the greenhouse in normal conditions is: the amount of heat transfer system is set to Q.
In this way, the heat loss of the cultured constant temperature commercial heat pump heating is simplified:
Q = u1 + u2
Q – greenhouse heating heat load;
U1 – referred to as the heat loss of enclosure structures;
U2 – referred to as cold air infiltration heat loss;
That is, the heat loss of the cultured constant temperature commercial heat pump heating is caused by the roof, ground, wall, door window, and other enclosures, and radiated heat and indoor air passing the door, windows, and enclosing structures. composition.