| 摘要 |
PURPOSE:To reconcile the prevention of the blur of a window glass in the coldest season and the prevention of the head-heated feeling at the time of brightly shining of the sun by controlling the switching of the heat mode and the heat/defrost mode on the basis of the function value computed from the outside air and the solar radiation quantity. CONSTITUTION:At the time of air conditioning operation, a control unit 2 firstly judges that the mode is the heat mode or not, and at the time of the heat mode, the outside air temperature ta is detected by an outside air temperature sensor 25 so as to be compared with the predetermined outside air temperature tao. In the case of ta<=tao, the solar radiation quantity S is detected by a solar radia tion quantity sensor 23 so as to get the point of switching the mode. This point of switching the mode is computed with a formula of the straight line So=Atao+ B (A and B are the constant). Next, the unit judges that the solar radiation quantity S is larger than So or not. In the case of S>So, the heat mode is maintained, and in the case of S<=So, the mode is switched to the heat/defrost mode. And in the case of ta>tao, the heat mode is maintained. |
