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EP-4067847-B1 - HEATING COST DISTRIBUTION DEVICE AND METHOD OF OPERATING A HEATING COST DISTRIBUTION DEVICE

EP4067847B1EP 4067847 B1EP4067847 B1EP 4067847B1EP-4067847-B1

Inventors

  • KUHN, JENS

Dates

Publication Date
20260513
Application Date
20220324

Claims (13)

  1. Method for operating a heat cost allocator (1), wherein a volumetric flow rate (m) and a feed temperature (T V ) of a heat transfer medium flowing through the radiator (3) and, by means of a radiator surface temperature sensor, a surface temperature (T O ) of the radiator (3) at a predefined relative height (h%) on the radiator (3) and a room temperature (T L ) are determined as parameters of a first parameter group and from in each case at least one parameter of this first parameter group - a return temperature (T R ) of the radiator (3) according to the formula T R = T O − h% ∗ T V 1 − h% , - a logarithmic overtemperature (ΔT ln ) of the radiator (3) according to the formula Δ T ln = T V − T R ln T V − T L T R − T L , - a radiator exponent (n) of the radiator (3) according to the formula n = ln Δ T ln , A 1 Δ T ln , A 2 Q A 1 Q A 2 , - a reference power (Q R ) of the radiator (3) according to the formula Q R = Q Δ T ln , R Δ T ln n , and - at least one consumption value (Q1, Q2) corresponding to a quantity of heat output by the radiator (3) are derived as parameters of a second parameter group, wherein at least two operating points (A1, A2) with, at least substantially, constant volumetric flow rate (m), constant feed temperature (T V ), constant surface temperature (T O ) of the radiator (3) at the predefined relative height (h%) on the radiator (3) and constant room temperature (T L ) are determined, and wherein - the return temperature (T R ) of the radiator (3) is determined for each of the operating points from the feed temperature (T V ) and the surface temperature (T O ) of the radiator (3) at the predefined relative height (h%) on the radiator (3), - an instantaneous power (Q A1 , Q A2 ) of the radiator (3) is determined for each of the operating points from the feed temperature (T V ), the return temperature (T R ) and the volumetric flow rate (m), - the logarithmic overtemperature (ΔT ln,A1 , ΔT ln,A2 ) of the radiator (3) is determined for each of the operating points from the feed temperature (T V ), the return temperature (T R ) and the room temperature (T L ), - the radiator exponent (n) is determined from the logarithmic overtemperatures (ΔT ln,A1 , ΔT ln,A2 ) and instantaneous powers (Q A1 , Q A2 ) of the two operating points, - the reference power (Q R ) of the radiator (3) is determined from the logarithmic overtemperature (ΔT ln,A1 , ΔT ln,A2 ) and the instantaneous power (Q A1 , Q A2 ) of at least one of the operating points and the radiator exponent (n), wherein the following are inserted into the formula Q R = Q Δ T ln , R Δ T ln n for determining the reference power (Q R ) of the radiator (3): for ΔT ln the logarithmic overtemperature (ΔT ln,A1 , ΔT ln,A2 ) of the respective operating point and for Q the instantaneous power (Q A1 , Q A2 ) of the respective operating point.
  2. Method according to Claim 1, wherein a K Q -value is determined from the reference power (Q R ) of the radiator (3).
  3. Method according to either of the preceding claims, wherein c-values of a feed temperature sensor, a radiator surface temperature sensor and at least one room temperature sensor are determined.
  4. Method according to Claim 3, wherein a Kc-value is determined by means of the c-values of the temperature sensors.
  5. Method according to any of the preceding claims, wherein by means of a specific heat capacity (c) of a heat transfer medium flowing through the radiator (3), the volumetric flow rate (m), the feed temperature (T V ) and the return temperature (T R ) and/or by means of a correction factor (K) determined from the K Q -value and the Kc-value, the surface temperature (T O ) of the radiator (3) at the predefined relative height (h%) on the radiator (3), the room temperature (T L ) and the radiator exponent (n), a consumption value (Q1, Q2) corresponding to the quantity of heat output by the radiator (3) is determined.
  6. Heat cost allocator (1), operated by means of a method according to any of the preceding claims, comprising a feed assembly (BG1) arrangeable or arranged on a feed line (2) of a radiator (3) and having a feed temperature sensor designed and configured for determining the feed temperature (T V ), a radiator surface assembly (BG2) arrangeable or arranged at a predefined relative height (h%) on the radiator (3) and having a radiator surface temperature sensor designed and configured for determining the surface temperature (T O ) of the radiator (3) at the predefined relative height (h%) on the radiator (3), and at least one room temperature sensor designed and configured for determining the room temperature (T L ), and at least one arithmetic unit or a plurality of arithmetic units, which is designed and configured or which are jointly configured and designed for determining all parameters of the second parameter group by means of in each case at least one parameter of the first parameter group.
  7. Heat cost allocator (1) according to Claim 6, - wherein the feed assembly (BG1) comprises a communication device, which is in particular designed and configured for communication with the radiator surface assembly (BG2) and/or a third assembly (BG3) and/or a fourth assembly (BG4), and/or - wherein the radiator surface assembly (BG2) comprises a communication device, which is in particular designed and configured for communication with the feed assembly (BG1) and/or the third assembly (BG3) and/or the fourth assembly (BG4).
  8. Heat cost allocator (1) according to Claim 6 or 7, wherein the feed assembly (BG1) comprises a volumetric flow rate sensor designed and configured for determining, in particular measuring, the volumetric flow rate (m).
  9. Heat cost allocator (1) according to any of Claims 6 to 8, wherein the feed assembly (BG1) is designed as a radiator valve with a thermostat head, said radiator valve being designed with a constant volumetric flow rate or for carrying out a proportional operation mode in which there is a direct proportionality between a valve stroke of the radiator valve and a volumetric flow rate (m) through the radiator valve, or comprises such a radiator valve with a thermostat head.
  10. Heat cost allocator (1) according to any of Claims 6 to 9, comprising a third assembly (BG3) spaced apart from the radiator (3), and in particular having a further communication device, which is in particular designed and configured for communication with the feed assembly (BG1) and/or the radiator surface assembly (BG2) and/or a fourth assembly (BG4), wherein the third assembly (BG3) is arrangeable or arranged in the same room of a building with the radiator (3).
  11. Heat cost allocator (1) according to any of Claims 6 to 10, comprising a fourth assembly (BG4) spaced apart from the radiator (3), and in particular having a further communication device, which is in particular designed and configured for communication with the feed assembly (BG1) and/or the radiator surface assembly (BG2) and/or a third assembly (BG3), wherein the fourth assembly (BG4) is arrangeable or arranged outside the room in which the radiator (3) is arranged.
  12. Heat cost allocator (1) according to any of Claims 6 to 11, wherein the at least one room temperature sensor or at least one further room temperature sensor, which is designed and configured for determining the room temperature (T L ), is arranged in the feed assembly (BG1), in the radiator surface assembly (BG2) or in the third assembly (BG3).
  13. Heat cost allocator according to any of Claims 6 to 12, wherein the arithmetic unit or at least one further arithmetic unit, which is designed and configured for determining at least one parameter of the second parameter group by means of at least one parameter of the first parameter group, is arranged in the feed assembly (BG1), in the radiator surface assembly (BG2), in the third assembly (BG3) or in the fourth assembly (BG4).

Description

The invention relates to a method for operating a heat cost allocation device and a heat cost allocation device. From the DE 10 2016 104 225 A1 A heat cost allocator and a method for measuring the amount of heat emitted by a radiator are known. The measurement of the heat emitted by a radiator is based on a measured flow temperature and a measured radiator temperature of the heat transfer medium at the radiator. The valve stroke of a radiator control valve is determined, and the emitted heat quantity is calculated from the values of valve stroke position, flow temperature, and radiator temperature using an optionally preset operating characteristic of the radiator control valve and a known differential pressure of the heat transfer medium across the radiator control valve at its operating point. The optionally preset operating characteristic establishes the relationship between the stroke position and the volume flow rate at the known differential pressure. In the DE 10 2018 103 144 A1 This document describes a heat cost allocator for recording the amount of heat emitted by a radiator. The heat cost allocator comprises a flow temperature sensor, a room air temperature sensor, a radiator control valve, a device for determining the valve stroke position of the radiator control valve, and a calculation unit. The radiator control valve has a dynamic valve body that maintains a constant pressure differential across the valve. The calculation unit is designed to calculate the amount of heat emitted from the determined valve stroke position and the measured flow temperature and room air temperature. The invention is based on the objective of providing a method for operating a heat cost allocation device that is improved compared to the prior art, and a heat cost allocation device that is improved compared to the prior art. The problem is solved according to the invention by a method for operating a heat cost allocation device with the features of claim 1 and a heat cost allocation device with the features of claim 6. Advantageous embodiments of the invention are the subject of the dependent claims. In a method according to the invention for operating a heat cost allocator, a volume flow rate m and a supply temperature Tv of a heat transfer medium flowing through the radiator, as well as a surface temperature To of the radiator at a predetermined relative height h% on the radiator and a room temperature T L , i.e., a room air temperature of a room in which the radiator is located, are determined. These parameters form a first parameter group, i.e., they are a component thereof. The volume flow rate m is determined, for example, by means of a volume flow sensor of the heat cost allocator, in particular by measurement. Alternatively, the heat cost allocator, in particular a supply assembly of the heat cost allocator, can have, for example, a radiator valve with a constant volume flow rate m, which is, in particular, adjustable. This constant volume flow rate m is then known, for example, due to a preset constant volume flow rate m when the radiator valve is installed on the radiator. For the method described here, this known constant volume flow rate m is then used, whereby the constant volume flow rate m, i.e., its current state, is then further determined, for example, based on the supply temperature or on an opening sensor on the radiator valve. The flow temperature T V of the heat transfer medium flowing through the radiator is determined, in particular measured, by means of a flow temperature sensor of the heat cost allocator. The surface temperature To of the radiator at the specified relative height h% on the radiator is determined, in particular measured, by means of a radiator surface temperature sensor of the heat cost allocation device according to the invention. The room temperature T L , i.e. the room air temperature of the room in which the radiator is located, is determined, in particular measured, by means of a room temperature sensor of the heat cost allocator. From at least one parameter of the above-mentioned parameters, i.e., from at least one of the parameters of the first parameter group mentioned above, or from several or all parameters of the first parameter group mentioned above, a return temperature T R of the radiator, a logarithmic excess temperature ΔT ln of the radiator, a radiator exponent n of the radiator, a reference power Q R of the radiator, and At least one consumption value Q1, Q2 corresponding to a quantity of heat emitted by the radiator is derived. These parameters, each derived from at least one of the parameters of the first parameter group, form a second parameter group. Thus, the parameters of the first parameter group are each determined, in particular measured, whereby for the parameter volume flow m, as described above, it may be provided, for example, that this parameter is also measured, in particular by means of the volume flow sensor, or that, in particular when usi