What is the heating curve and weather control in the central heating boiler

What is the purpose of using weather control in the boiler - is it worth it?

The previous article discusses the method of boiler control using electronic devices, the so-called automation of the control process.
The main goal of introducing devices that support automatic control is the ability to calculate the values ​​of parameters that are necessary to maintain the appropriate temperature inside the room by reacting to changing external factors.


So you can say that automation is necessery  to:

  1. The departmental boiler operated more efficiently
  2. The boiler used less energy - less fuel
  3. The boiler control was easy and preferably maintenance-free.
  4. The fact that automatic control is much more convenient for the end user. Nice automatic control is obvious.
  5. Householders do not have to worry about calculating the temperature of water supply in radiators and when to turn it on when they turn off.


 What is the role of weather control systems?


The correct selection of parameters for the combustion process is crucial to ensure comfort and optimize the cost of weather conditions for residential premises.

In an ideal heating system, the only input parameter set by the user should be the set temperature inside the room and the selection of all other parameters should deal with the Automatic system.

This action is possible thanks to the use of systems called weather control systems.

The purpose of using such systems is automatic calculation of boiler operation parameters, which include:

  •  pump operation time
  •  supply temperature
  •  pump run-on time
  •  burner blocking time
  •  modulation of flame strength
  •  operating time of the burner
  • delta (differental) value of temperature difference at which the boiler switches on


Selection of these parameters by a person who is not an expert and is very difficult and there is a huge risk that it will be working badly, ineffective or even (in extreme cases) it could result in malfunctioning the boiler.


With the help of us comes a weather control system that has an external temperature sensor and often even other sensors such as humidity and wind pressure and is able to select all of the above parameters depending on the changing conditions outside.

For example, if the weather control system detects a sudden change in temperature to a plus and thus the insulation can extend the time of blocking the pump and lowering the set temperature so that the room does not overheat due to previous parameters.
 

Why some system fails with automatic weather control ?

Control based solely on the internal thermostat is not ideal.


 The systems based on correction-based control perform much better - that is, continuous selection of combustion parameters depending on the changing conditions outside.

Optimal heating means not only providing the set temperature in the shortest possible time, it is also its maintenance so that there is no temperature jump inside the room that is always received negatively by users.

 It should also be remembered that heating the boiler is the most expensive energy.


 it is much better to work on low modulation in the case of condensing boilers because they have the highest efficiency then.


This law is also known from the automotive industry:

We can give this some analogy - economic driving consists in gradually accelerating and releasing cars in a natural way.
 The total oposite situation not-economic driving consists in a very rapid acceleration and the use of the brake in such situations leads to enormous energy losses which are dissipated on the brake pads.


The optimal control of the boiler is very similar.

Leading manufacturers of boilers are trying to create advanced control programs whose purpose is prediction and therefore prediction of heating parameters at the stage of changing weather conditions.


Boiler manufacturers are reluctant to reveal the algorithms with which their products work, but based on the instructions and functions of the heating curve, we are able to draw some conclusions.


Advanced users interested in the subject have come to the conclusion that manufacturers use quite advanced programs that have memory,

 In the future, one should expect in the future also algorithms based on machine learning so-called artificial intelligence.

Will will continue this topic in more detailed way with pratical examples very soon.