After the air conditioner is turned on, the initial state of the air conditioner should be point A. The speed corresponding to point A is high speed, which means that the air conditioner will heat up rapidly with maximum power and reach the temperature set by the user in the shortest time. The power of the coil is N3, which is much larger than the cold load NL. The room temperature rises rapidly, and the working state of the air conditioner moves from point A to point B and point C to the right. As the temperature of the room increases, the cold load NI is also gradually increased. If before reaching point B, NL gradually increases as far as NL=N3, and the heat and the heat balance. At this time, although the temperature of the room is lower than 19 ° C, it does not meet the requirements of 20 ± 1 ° C, but it will not rise. This shows that the amount of fan coil is too small to meet the design requirements. At this time, the fan coil will remain in high-grade operation, and the room temperature will remain below 19 °C. The above situation occurs when the capacity of the air conditioning system is insufficient or the set temperature is too high to be reached.
Now consider it separately:
(1)NZ (3) NZ>NL: heating capacity> cold load. In this case, the room temperature continues to rise, and NL increases the operating point of the coil to move toward point E. At this time, there are two kinds of situations at night: NZ two NL appears at a certain point before reaching point E. At this time, the fan coil will maintain this state and become a stable working state. The room temperature is stable at a point larger than point B and smaller than point E. Value, the working state of the coil remains unchanged. Always keep NZ>NL, then the status point of the coil will move right to point E, the thermostat will switch the coil speed to low, and the working state will jump to point G. This shows that the heat of the mid-range is still greater than the heat required to maintain the temperature of 20 ° 1 ° C, the coil automatically turns to the low-end working state. After the coil is transferred to a low-end work, its heating capacity becomes Nl, due to Nl
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