CPC F24F 11/84 (2018.01) [F24F 11/63 (2018.01); G05B 19/042 (2013.01); G05B 2219/2614 (2013.01)] | 22 Claims |
1. A process of controlling a plant for air conditioning or heating, said plant comprising a delivery line, a return line and a predetermined number of service lines hydraulically interposed between the delivery line and the return line, each service line comprising a thermal exchange unit,
wherein said process comprises:
circulating a carrier fluid through at least one service line of the service lines so that a carrier fluid particle traversing a first section of the service line upstream of the thermal exchange unit subsequently traverses a second section of the service line placed downstream of the thermal exchange unit, with a hydraulic delay (dt) given by a time necessary for the carrier fluid particle to pass from the first to the second section, repeating a cycle comprising:
a) determining at least one value of a temperature difference (ΔT) between:
a temperature (Tt1) of the carrier fluid, at the first section, detected at a first instant (t1), and
a temperature (Tt2) of the carrier fluid, at the second section, detected at a second instant (t2), wherein the second instant is subsequent to the first instant (t1) by said hydraulic delay (dt), and
b) detecting a value (φ) of the flow rate of the carrier fluid traversing the thermal exchange unit,
wherein, in each repetition of the cycle, the process includes obtaining at least one pair of values, comprising the value of said temperature difference (ΔT) and the value of the carrier fluid flow rate (φ); and
the process further comprises:
using a plurality of said pairs of said values obtained from the repetition of the cycle, determining at least one of:
a characteristic function which relates said temperature difference (ΔT) between the first and the second section to said value of the carrier fluid flow rate (φ), and
a characteristic function which relates a thermal power exchanged (dQ/dt) by the thermal exchange unit to said value of the carrier fluid flow rate (φ);
receiving at least one desired value of an operating parameter, the operating parameter comprising at least one of:
thermal power exchanged by the carrier fluid in the passage through each thermal exchange unit,
heat exchanged by the carrier fluid in a predetermined time interval in the passage through each thermal exchange unit, or
a temperature difference (ΔT) between temperature (Tt1) of the carrier fluid, at the first section, detected at a first instant (t1), and temperature (Tt2) of the carrier fluid, at the second section, detected at a second instant (t2);
determining, for each thermal exchange unit, an actual value of said operating parameter;
comparing said desired value of the operating parameter with said actual value of the operating parameter and determining if said actual value differs from the desired value by more than a predetermined threshold; and
in response to the determination that the difference is more than the predetermined threshold, performing a control step including at least one of:
driving a central thermal treatment group connected to the delivery line to regulate at least one general parameter selected from among: flow rate set for the carrier fluid, hydraulic head set for the carrier fluid traversing the central thermal treatment group, heating set for the carrier fluid traversing the central thermal treatment group, cooling set for the carrier fluid traversing the central group,
driving the flow rate regulator present on the service line of the thermal exchange unit, or
driving a thermal exchange modulator associated with the thermal exchange unit.
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