DE19629953A1 - Heating boiler circulation temperature regulation method - Google Patents

Abstract

The circulation temperature regulation method calculates the required circulation temperature in dependence on the heating load., e.g. the external temperature, for comparison with the mean value of the actual circulation temperature, for controlling the on-off switching of the boiler to correct the difference between the actual and required temperature.

Description

The invention relates to a method according to the preamble of the patent saying 1.

In modern boilers, the flow temperature is dependent on a performance-determining variable. The specific one The required flow temperature is required by the Characteristic curve set.

For a variety of reasons, the actual flow values can differ from the Setpoints deviate because in many cases there are still special boiler-specific requirements are to be considered. So it may be that minimum or switch-on temperatures for protection against condensation the, or that minimum switch-on temperatures at low outside temperatures necessary to ensure the desired room temperature are. Furthermore, minimum burner run times or switch-off times can also be set for heaters with a small water content, such as circulating water heaters to be held. Such specifications result in a resulting flow temp temperature that increases from the set flow temperature according to the characteristic curve or may differ below.

The object of the invention is to regulate the flow temperature to create a boiler with the actual flow temperature despite the target flow temperature determined depending on the output consciously made guidelines leading to deviations from the rules going matches.

The solution according to the invention consists in the application of the patent Proverb 1 mentioned process steps.

The existing flow temperature sensor measures this using the characteristic and the additional specifications resulting flow temperature. Of the The controller averages and dampens them and then compares them with the performance-dependent target flow temperature. In the event of a system deviation that the controller would then work due to the additional requirements automatically to the burner's switch-on and / or switch-off criteria in this way that the target flow temperature is achieved. This way, despite the deviations due to the additional specifications the flow temperature adjusted to the setpoint.

The measured flow temperature is carried out in practice soft and hardware damped to a balanced middle Value for comparison with the target flow value according to the characteristic curve turn. As switch-on and switch-off criteria for the burner to adjust the Actual values at the setpoint are in particular the switch-on temperature and / or the switch-off temperature is suitable. If there is a rule deviation is determined, it is possible by changing one of the two  or to achieve an adjustment of both values. This is done in such a way that the flow temperature setpoint is changed until the measured its mean flow temperature with the setpoint according to the characteristic matches. This task can e.g. B. take over a PI controller.

The drawing shows a functional diagram of the Reg lers.

Based on the outside temperature (ϑ _A ) and the specified settings of the characteristic curve, a target flow temperature (ϑ _{V target} ) results. This is compared with the damped, mean flow temperature (ϑ _{V Is damped} ). In the event of a control deviation, the set flow temperature is changed by a PI controller. This corrected set flow temperature (ϑ _{V set correction} ) acts on the on and / or off _{temperature values of} the burner (Br), so that the actual flow temperature (ϑ _{V actual} ) and the set flow temperature (ϑ _{V Target} ).

Claims (2)

1. A method for regulating the flow temperature of a boiler depending on a performance-determining variable such as the outside temperature (ϑ _A ), taking into account boiler-specific specifications influencing the _target flow temperature (ϑ _{V target} ), characterized in that the controller detects the temperature sensor from the existing flow temperature (ϑ _V ) measured, hardware and software damped mean flow temperature (ϑ _{V is damped} ) with the target flow temperature (ϑ _{V set} ) and, in the event of a control deviation, acts on the burner's (Br) switch-on and / or switch-off criteria in such a way that the target flow temperature (ϑ _{V target} ) is achieved. 2. The method according to claim 1, characterized in that the controller in the event of a control deviation over a setpoint temperature (ϑ _{V setpoint} ) corrected setpoint flow temperature (ϑ _{V setpoint correction} ) to the on and / or off temperature values (ϑ on _{/ off} ) of the Brenners (Br) acts in such a way that the target flow temperature (ϑ _{V target} ) is reached.