Type 0869

Number
869

Name
boiler

Distribution
SPF

Description
This boiler model programmed for TRNSYS 16.1 simulates boilers that use conventional combustion techniques for carbon-based fuels or hydrogen to heat a fluid mainly in a gas-water heat-exchanger. The user is allowed to choose from predefined fuels (oil, gas, and biomass) or to define an own fuel (by means of weight-fractions of chemical elements and the heating value). In a first step, the model calculates the flue gas products and the temperature and mass flow of the flue gas before the heat exchanger process. In a second step, the heat transfer across the flue gas to water heat-exchanger is calculated. For the calculation of this heat transfer, the user can choose from different simulation approaches that range from simple approaches that are easier to parametrize to more advanced approaches that need more effort for their parametrization. The third and last step determines the energy balance of the thermal mass of the boiler (a one-node approach) and calculates the temperature of the water flowing out of the boiler as well as heat losses to ambient. Burner cycling (also within one time step) is calculated and the number of times the burner switched on during a simulation is an output of the model.