【 Weak current College 】 air-cooled heat pump air conditioning temperature control method

Air-cooled heat pump air conditioner temperature control method: is a means of measuring wind speed evaporator outlet.

1, the first system simulation, evaporation temperature and wind speed evaporator outlet.

2, then installed in the evaporator outlet of the wind speed sensor measuring speed calculated evaporation temperature, depending on the evaporator surface temperature and evaporation temperature relationship evaporator surface temperature and, depending on the evaporator surface temperature to determine whether the defrosting.

3. Finally, according to the evaporator outlet velocity is reached normal operation of the thresholds to determine whether the end of defrosting.

Control methods include:

1) air-cooled heat pump for outdoor simulation, build machine, indoor, compressor and throttling element simulation model;

2) under pressure balance, mass balance and energy balance principle, do a system simulation of frost run, come to the evaporator evaporation temperature and evaporator outlet velocity relationship: t0 = 0.1417v5-0.5463v4 + 0.6173v3-0.0988v2 + 0.4941v-4.9040

3) in the outdoor unit of the evaporator outlet installed wind speed sensor;

4) according to the specific system, set the value of the Δ t w and tw thresholds (e.g., Δ t w = 1.5 ℃, tw =-3 ° c); set time step (e.g. 2min) and normal operation of the wind speed threshold values (such as 1.8m/s);

5) when the air-cooled heat pump starts to run-time, within the time step will wind speed sensor to wind generation in formula 1, evaporating temperature t0;

6) formula 1 calculated evaporation temperature t0 generation in formula 2, get the evaporator surface temperature tw;

7) judgment of evaporator surface temperature tw if the set of values;

8) if the value of the tw up, start cream; 9 if not reached, continue to run;

9) began after defrosting, when measured wind speed v up threshold (e.g. greater than 1.9m/s), end of defrosting, otherwise continue to defrost.

By defrosting control method, not only simple but also very good conservation of energy, to overcome the traditional disadvantages of defrosting control technology, good control of defrosting.