RU2013135623A - METHOD FOR TAKING INTO HEAT ENERGY DISPLAYED BY A HEATING DEVICE - Google Patents

Abstract

1. The method of accounting for thermal energy supplied by the heater, which consists in the fact that in accordance with the Newton-Richmann law, the difference in the average temperatures of the heater and air is measured, which is multiplied by the heat transfer coefficient of the heater, which is based on the reference data, or when measured in special laboratory conditions, and the subsequent integration of the values of the obtained heat capacity in time for the selected observation interval, for example, for a month, and characterized in that, in order to increase t measurement accuracy, first, the heat transfer coefficient for a given measured sample is found by stopping the flow of coolant into the heater, then measuring the temperature dependence of the cooling heater, finding the rate of temperature change and calculating the coefficient by the formula: where α is the heat transfer coefficient of the heater [W / ° C ]; C - heat capacity of the heater, [J / ° C]; - rate of change of temperature of the heater at the calibration point, where the calibration point is GSI as the arithmetic average value between the maximum and minimum temperatures of the heater for the observed period; at the same time, the observation period can be from a minute to several days, and the temperature of the heater at the calibration point can lie in the entire range of measured temperatures; t is the current time [s]; is the average temperature of the surface of the heater at the calibration point [° C] ; - value of the air temperature in the room at the calibration point [° С]; t - current time [s], after finding the coefficient

Claims (2)

1. The method of accounting for thermal energy supplied by the heater, which consists in the fact that in accordance with the Newton-Richmann law, the difference in the average temperatures of the heater and air is measured, which is multiplied by the heat transfer coefficient of the heater, which is based on the reference data, or when measured in special laboratory conditions, and the subsequent integration of the values of the obtained heat capacity in time for the selected observation interval, for example, for a month, and characterized in that, in order to increase t chnosti measurement initially is the heat transfer coefficient for a given sample measured by discontinuing the heat supply to the heater, then measuring the temperature dependence of the cooling heating device, finding a rate of temperature change of said coefficient and calculating according to the formula: $${\alpha }_{\mathrm{and}\mathrm{from}t}=\frac{{\mathrm{FROM}}_{\mathrm{and}\mathrm{from}t.}\cdot \frac{d{T}_{\mathrm{and}\mathrm{from}t.}}{dt}}{T_{\mathrm{and}\mathrm{from}t.}^{\mathrm{to}}-T_{\mathrm{at}}^{\mathrm{to}}},$$

where α _East - heat transfer coefficient of the heating device [W / ° C]; With _East - the heat capacity of the heater, [J / ° C]; $$\frac{d{T}_{\mathrm{and}\mathrm{from}t.}}{dt}|(T_{\mathrm{and}\mathrm{from}t.}=T_{\mathrm{and}\mathrm{from}t.}^{\mathrm{to}}|$$

- the rate of change of the temperature of the heater at the calibration point, where the calibration point is located as the arithmetic average between the maximum and minimum temperatures of the heater for the observed period; at the same time, the observation period can be from a minute to several days, and the temperature of the heater at the calibration point can lie in the entire range of measured temperatures; t is the current time [s]; $$T_{\mathrm{and}\mathrm{from}t.}^{\mathrm{to}}$$

- the value of the average surface temperature of the heater at the calibration point [° C]; $$T_{\mathrm{at}}^{\mathrm{to}}$$

- the value of the air temperature in the room at the calibration point [° C]; t is the current time [s], after finding the heat transfer coefficient, the heating system is brought into working condition, and the thermal power is found by the formula: $$P_{tePl}={\alpha }_{\mathrm{and}\mathrm{from}t.}\cdot (T_{\mathrm{and}\mathrm{from}t.}-T_{\mathrm{at}})={\mathrm{FROM}}_{\mathrm{and}\mathrm{from}t.}\cdot \frac{d{T}_{\mathrm{and}\mathrm{from}t.}}{dt}\cdot \frac{(T_{\mathrm{and}\mathrm{from}t.}-T_{\mathrm{at}})}{T_{\mathrm{and}\mathrm{from}t.}^{\mathrm{to}}-T_{\mathrm{at}}^{\mathrm{to}}},$$

$$T_{\mathrm{and}\mathrm{from}t.}^{\mathrm{to}}$$

and $$T_{\mathrm{at}}^{\mathrm{to}}$$

- current values of the surface temperature of the heater and air at the calibration point [° C], for the transition from thermal power to thermal energy, instantaneous values of thermal power are summed (integrated) in time: $$Q={\displaystyle \sum _i{\alpha }_{i_{\mathrm{and}\mathrm{from}t.}}\cdot (T_{i_{\mathrm{and}\mathrm{from}t.}}-T_{i_{\mathrm{at}}})}\cdot \Delta t,$$

where i is the reference number in time; Δt is the interval for taking time samples; in general, Δt may be a function of the average operating temperature, which varies over time (for example, day, month, heating season). 2. The method of accounting for thermal energy supplied by the heater according to claim 1, characterized in that the calibration point is calculated by finding the probability density distribution of the temperature difference between the source and the air during the observation period, and finding the mathematical expectation, which will be the calculated temperature at the point calibration.