Analysis on the Development Prospect of Intelligent Air Conditioning Thermostat Market

For a long time, because it can flexibly control the start and stop of air conditioning units in various regions and the indoor temperature, and can save building space and engineering cost, fan coil unit (FCU) plus fresh air conditioning system has always been the preferred semi-centralized air conditioning system type for hotels, restaurants and office buildings where rooms and business rooms are rented as the main business. Room air conditioning thermostat is the key to control the cooling/heating of the end device-fan coil unit (FCU), and realize the temperature control and energy-saving operation of the sub-room.

The ordinary fan-coil air-conditioning thermostat is basically an independent closed-loop temperature adjustment system, which is mainly composed of a temperature sensor, a two-position controller, a temperature setting mechanism, a manual three-speed switch and a cold and heat switching device. The control principle is that the air conditioner thermostat generates a two-position control signal according to the comparison result of the room temperature measured by the temperature sensor and the set value, and controls the opening and closing of the electric water valve (two-way valve or three-way valve) of the hot and cold water circulation pipeline. Use the method of cutting off and opening the water circulation in the coil to adjust the air supply temperature (cooling capacity).

The first-generation air-conditioning thermostat is mainly an electrical product. The temperature sensor of the air-conditioning thermostat uses a bimetallic sheet or a pneumatic temperature bag. The temperature is set by adjusting the preload through the "given temperature plate". The fan three-speed switch and The seasonal changeover switch is a splash-type mechanical switch. This kind of air conditioner thermostat products generally have problems such as "temperature setting index value is too coarse", "time constant is too large", "mechanical switch is easy to damage" and so on.

The second-generation air-conditioning thermostat is an electronic product. The temperature sensor adopts thermistor or thermal resistor. The temperature setting and wind speed switch of some products realize human-computer interaction interface through touch keys and LCD screen. The cold and hot switching is automatically completed. The operational amplifier circuit and the switch circuit realize two-position adjustment. This kind of intelligent air-conditioning thermostat product improves the human-computer interaction interface and solves the problem of "too coarse temperature setting division value", but there are still "low control accuracy", "large time constant", "more complicated operation" And other issues.

At present, domestic and foreign manufacturers are researching and developing the third generation of intelligent room temperature air-conditioning thermostat, applying new control models and numerical control chips to realize intelligent control. Now domestic manufacturers have produced intelligent room temperature air conditioning thermostat, and has been applied to practical engineering.