Comfort Control Techniques for the Users of a Room - Comfort Control in Buildings - page 185

Fig. 5.23 Winter split-range sequence control strategy applying energy efficiency

Fig. 5.24 Summer split-range sequence control strategy applying energy efficiency

valve begins to work is associated with a control signal provided for the PI controllers
greater than 44 6% for summer. These values have been esti-

mated from real tests with the HVAC system in the real room. More specifically, to
estimate these values, steps from an initial value of fancoil velocity equal to 0% to
a final value of fancoil velocity equal to 100%, and maintaining an aperture of the
valve equal to its minimum value, have been provided to the HVAC system under
the different operation modes. Then, with the fancoil velocity equal to 100%, the
aperture of the valve was changed from its minimum value to a final value equal to
100%. From the obtained results, it can be observed that the contribution of fancoil
velocity to the total change in the impulse air temperature, T a imp , is approximately
equivalent to 44.7 and 36

. 7% for winter and 36 .

6% of the total change which can be achieved with the
available HVAC system for, respectively, winter and summer operation modes.

.