Patent EA-002187-B1 (EA)
Title: Method and heat consumption meter for recording heat consumed in radiator
Inventor: FISCHER-HANSEN JENS PETER
IPC: G01K17/06
Filed: 1996-12-18
Abstract: 1. A method and a heat consumption meter for recording heat consumed in a radiator located in a room where associated values of the respective temperatures of the radiator and the room are measured or calculated by said heat consumption meter, and wherein the measured or calculated values for room temperature and radiator temperature are used to calculate the heat emission from the radiator to the room using electrical circuits (7,8) in said heat consumption meter, said calculation being carried out on the basis of a predetermined mode of calculation, and wherein the calculated values for the heat emission are continuously summed to a recording value in a first register, and wherein the sum thus obtained is used as a new recording value, characterized in that in with the proviso that the difference between the room temperature and radiator temperature ranges between zero and a predetermined value an "idle" calculation mode is selected and maintained till the numeric difference between values of the room and radiators temperatures is lower than the predetermined value, wherein in said "idle" mode for the room temperature ranges which exceed the radiator temperature negative values for the radiator's heat emission to the room are calculated, and for the room temperature range which are lower than the radiator temperature, positive values for the radiator's heat emission to the room are calculated, and the thus calculated values for the negative heat emission as well as the positive emission are recorded in a special register using recording means at least over a period, and that on the basis of these values a value is obtained and recorded for the total heat emission that corresponds to the sum of the calculated values for heat emission, and that this value is added to the recording value. 2. The method according to claim 1, characterized in that such period which corresponds to 24 hours. 3. The method according to claim 1 or 2, characterized in that only positive values of total heat emission are added to the recording value in the first register. 4. The method according to claim 1 2 or 3, characterized in that said "idle" calculation mode is selected from a number of different calculation modes depending on the mutual relation between room temperature and radiator temperature. 5. The method according to claim 4, characterized in that in temperature ranges where the numeric difference between values for the room temperature and the radiator temperature exceeds a predetermined marginal value, a calculation mode is selected in which a calculation of the heat emission is carried out successively for each measurement or calculation for associated values for the room temperature and the radiator temperature, following which only positive values for the heat emission are continuously added to the recording value. 6. The method according to claim 5, characterized in that in case of room temperatures that exceed a predetermined border value, a calculation mode is selected in which a predetermined substitute room temperature is used instead of the measured or calculated room temperature. 7. The method according to any one of the preceding claims, characterized in that in case of radiator temperatures that are lower than a predetermined value, a mode is selected in which no calculations of the heat emission are carried out. 8. An electric heat consumption meter for a radiator for exercising the method according to any one of the preceding claims and comprising a housing (1,2,3,4) with a calculator unit (8) and with associated temperature sensors (9 and 10) for radiator and room temperatures, wherein the calculator unit (8) comprises a register for storing a recording value for the total amount of heat consumed, and is arranged for calculating the heat emission from the radiator on the basis of said predetermined values, and to add this to the recording value in the first register, and to store this recording value as a new recording value, characterized in that the calculator unit (8) of the meter is arranged for the mode selecting means, said means are adapted to select the working "idle" mode with the proviso that ranges between zero and the predetermined value, besides said selecting means is adapted to maintain said operating "idle" mode till the calculated room temperature exceeds the calculated room temperatur, said calculator unit (8) carries out a calculation of negative heat emission, and sums this with any positive heat emission in a separate register within one or more periods corresponding to 24 hours, besides said calculator unit is adapted to add the sum of positive and negative heat emission to the recording value in the first register if said sum is positive. 9. The electric heat consumption meter for a radiator according to claim 8, characterized in that said calculator unit is provided with a means to carry out calculations within at least one period corresponding to 24 hours. 10. The electric heat consumption meter for a radiator according to claim 8 or 9, characterized in being arranged for switching to an alternative operating mode when the numerical difference between values for the room temperature and the radiator temperature exceeds a predetermined value, and wherein only the positive calculated values for the heat emission are continuously added to the recording value.