This simplified model evaluates CO₂ concentration in an airnode with a defined supply volume flow and flow path. Different air distribution methods (e.g. mixed ventilation and displacement ventilation) are accounted for by means of ventilation effectiveness.
The component can be downloaded for free.

This detailed component calculates the radiation (direct and sky diffuse) on planar collector fields under the influence of self-shading and shading through external obstructions like surrounding buildings. The model outputs can be linked to other components e.g. flat plate solar collectors.
The component can be downloaded for free.

This component allows programming TRNSYS components in Python. Compared to Type 169, the communication with the Python script has been significantly improved and allows, among other things, the import of Python libraries (e.g. NumPy).
The component can be downloaded free of charge.

This AddOn enables the calculation of complex glazing systems within the multi-zone building model (Type 56). Particularly the bidirectional scattering of radiation which e.g. occurs in slat systems or honeycomb structures and their interaction with other layers is considered in the model. In addition, the heat transfer processes between panes, spaces between panes and shading elements are calculated in detail. Additionally, the influence of openings in shading elements on convection and long-wave radiation exchange can be modelled.

TRNLizard is an input mask for Rhinoceros/Grasshopper for the simulation of 3D geometries in connection with different ventilation, heating and cooling concepts using the multi-zone building model Type 56 and numerous other TRNSYS types. TRNLizard allows the parametric modelling of 3D-geometries with TRNSYS.

TRNSYS thermal mutlizone building model, type 56, requires air flows between zones as input values. However, in natural ventilation systems these depend on the wind pressures and the inside and outside temperatures. To account for this situation, a coupling with an air flow model is absolutely necessary. TRNFLOW integrates the multi-zone air flow model COMIS into the type 56. An internal solver, optimized for this task, iterates in each time step between the two models until their solutions are consistent.

It allows the user to draw multizone buildings and import the geometry (including building self-shading and internal view factors for radiation exchange) directly from the powerful SketchUp interface into the TRNSYS Building environment (TRNBuild).

This component models a construction component where one layer may be a phase change material (PCM). In addition, the thermal active systems (TAB) can be modelled. The construction is modeled by a Crank-Nicolson algorithm. The model can be linked to the multizone building model (Type 56).

With this model, almost all operating modes of a ventilation system can be represented: heat recovery, heating, cooling, humidification and dehumidification, adiabatic exhaust air humidification, economizer and recirculation mode. In addition, the frost protection temperature for the heat recovery unit and a bypass mode can be defined. The component can be coupled with the multi-zone building model (Type 56) for detailed calculation of supply air conditioning.

Update for Type 401
The compression heat pump is modelled as a black box calculating the power of the condenser and the evaporator on characteristic power curves which are usually provided by the manufacturer. The component model includes frost and cycle losses. In contrast to the former model Type 401, with this update a modulating operation of the heat pump can be modelled.

The program UNICOLL can be used for the optional simulation of glazed or unglazed collectors. Next to the computation method for collectors this program contains a rule algorithm for mass flow. Mass flow or collector outlet temperature can be entered as time dependent input.

This component models the thermal performance of a flat plate collector in detail. It considers the heat capacity of the collector and the fluid as well as the transport time of the fluid through the collector. In addition, there are options to account for the temperature dependence of the collector U-value and the incident angle of various solar radiation components.

This model is quite universal, so it should be possible to simulate nearly all kinds of stores used for solar thermal systems. It offers the following modelling options: a stratified fluid storage tank with at most four heat exchangers, an internal electrical auxiliary heater and a maximum of ten times twice connections for direct charge and discharge.

The air-to-soil heat exchanger accounts for sensible as well as latent exchanges between airflow and tubes, diffusion into surrounding soil, frictional losses and flow of condensed water along the tubes. Local heating from integrated fan motor can be taken into account at tube inlet or outlet. Direction of airflow can be controlled (stratification in case of heat storage) and flexible geometry allows for inhomogeneous soils as well as diverse border conditions.

With this TRNSYS type, vertical borehole heat exchangers with double-U-pipes can be simulated. The transient heat flux in the earth within a radius of about 2 m around the borehole is modelled in detail with the Crank-Nicholson algorithm. For the outer boundary condition, an analytical formula for constant heat extraction is applied.

Author: M. Wetter, T. Afijei