Thermal analysis of air conditioning PTC heater
PTC heater is the most safe, reliable, efficient and clean electric heater. Experts predict that with the further reduction of power cost, the market demand of PTC heater will be greatly improved. At present, the commonly used PTC heater is mainly composed of PTC heating core and heat dissipation structure, which is often used for auxiliary heating and heater of air conditioning, The power is generally above 1000W. Due to the resistance temperature characteristic of PTC heater, PTC heater will produce the characteristics similar to thermostat. Through the structure design of PTC heater, improving the efficiency of power utilization is one of the main research contents in the field of PTC heater design and manufacturing.
The overall heating rate and temperature distribution of the heating core are related to the physical parameters of a single PTC ceramic chip and each layer of material. It is assumed that the surface temperature of the same PTC ceramic plate is uniform when it reaches steady state. Then the heat conduction problem of heating core can be regarded as one-dimensional heat conduction problem
Due to the influence of the existing technology, the Curie temperature of the same batch of PTC is the same. When the PTC reaches the steady state, the working temperature fluctuates within 0 ~ 10 ℃ of the Curie temperature. The working temperature of PTC material will affect its working resistance, thus affecting its heating power. Therefore, the temperature distribution of the heating core will be affected by different arrangement of PTC sheets, Therefore, under the condition of fixed selection, the temperature distribution of the heating core can be more uniform and the heat transfer effect can be better. Using MATLAB, under the condition of fixed PTC ceramic slice selection, the optimal arrangement of PTC ceramic chips is carried out with the goal of optimizing the overall heating. After optimization, the temperature distribution of the heating core is basically uniform