Heat metering for central thermal energy installation

Abstract

What is described is a virtual heat metering system (10), comprising: a plurality of sensors (12, 14, 16, 18, 20), adapted to be associated with a supply circuit of a central thermal installation (I) and arranged for supplying main signals (Qman., Tman., Trit., Pman., Prit., s) indicative of physical quantities representing the operation of the supply circuit (C) in a predetermined period of time ([delta]tTOT); a control apparatus (22), comprising: - a memory module (23) arranged for storing a thermal and fluid dynamic model (M) defined initially and representing the central thermal installation (I), identified on the basis of physical quantities representing the operation of the supply circuit (C) and the heat exchanger devices (H1,1,..., H1,n1; H2,1,..., H2,n2; ...; Hm,1,..., Hm,nm), detected in specified conditions of operation and stimulation of the installation (I); and data representing the variation of said main signals (Qman., Tman., Trit., Pman., Prit., s) in the period of time ([delta]TOT); and - a processing unit (24), arranged for receiving at its input the data representing the variation of the main signals (Qman., Tman., Trit., Pman., Prit., s) in the period of time ([delta]tTOT), and configured to process these data according to the thermal and fluid dynamic model (M) and to supply at its output the data (e1,1,..., e1,n1:e2,1,..., e2,n2; ...; em,1,..., em,nm) which represent the estimate of the thermal energy (E1,1,..., E1,n1:E2,1,..., E2,n2; ...; Em,1,..., Em,nm) individually exchanged between each heat exchanger device (H1,1,..., H1,n1:H2,1,..., H2,n2; ...; Hm,1,..., Hm,nm) and the corresponding thermal user (U1,..., Um).

Description

technical field [0001] The present invention relates to a system and a method for estimating thermal energy exchanged between a plurality of heat exchangers of a central facility for generating and supplying thermal energy and a user complex. Background technique [0002] In the prior art there are calorimeters or measuring devices also called heat meters, direct heating cost meters or therm meters, which in each case require Direct instantaneous measurement of the flow rate of heat carrier fluid per heating unit (or group of heating units) or the temperature difference of the same fluid between the inlet and outlet of the heating unit (or group of heating units). These metering devices therefore consist of the following components: [0003] · Two temperature sensors [0004] · Flow Sensors [0005] · Electronic system for processing and sampling the signals from the three sensors and processing these [0006] · Memory for thermal measurement results [0007] · Measurem...

AI Technical Summary

Problems solved by technology

The method described by [0026] has the disadvantage that it assumes that the heat energy exchanged between the environment inside the building and the outside environment is equal to the heat energy exchanged inside with the heating facility, and it erroneously It is assumed that the thermal energy exchanged between the interior and exterior of the living unit can be deduced from the internal volume only and from the thermal comfort, defined as the temperature reached in the living unit regardless of the heat transfer rate

[0027] Furthermore, this method does not take into account heating transients, in other words, the possibility that the desired temperature may need to be reached after an extended period of time without local facilities, this method also Does not take into account the energy expenditure required to raise the internal temperature above the losses to the outside

[0028]Finally, the UNI 9019 standard, which describes the metering method based on the "degree day" principle, is also based on the measurement of the thermal impact of heating installations on the environment inside living units, and suffers from precision issues like

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