Question

Ω testinal i Answer the following What is the difference between PD and PID respect to the effect of control parameter? a) controller Explain with the b) For the experiment, in which we did thc Pl control ofIIVAC with cifieations, why was the response feter Explain? response beter than the oa-off of the HVAC c) What is the steady state error of a PID controller? Scanned by CamScanner d) Whats is the transfer function of HVAC? devices or e) After starting the Labview, what is the first thing to do calibrate). Why.

Answer 1

In the HVAC mechanism the supply air pressure is tuned by changing the speed of a supply air fan but since in various Operating condition both fans and dampers show non-linear behaviour, even a well regulated controller is unable to meet design requirement due to existing uncertainties in the parameter of the system But by using P I controller the parameter of the system one optimized and giving the faster response, smaller over shoot and high accuracy output steady state error of a PID controller U(s) rightarrow Input signal k rightarrow proportional constant e_ss rightarrow steady state error \r\n E_s = U(s) - C(s) e_ss = lim_t rightarrow infinity E(s) U(s) = 1/s G(s) = k times 1/T_s + 1/(1 + k/T_s + 1) = k/T_s + 1/T_s + 1 + k/T_s + 1 G(s) = k/T_s + 1 + k C(s) = U(s) * G(s) = 1/s (k/T_s + 1 + k) = k/s(T_s + 1 + k) E_s =