Thermal imaging was used to acquire the average surface temperatures of the panels in the experimental investigations. Plastic tubes for liquid heat carrier (water in the presented study) were embedded at the bottom of the plaster layer. The experimental panels contained a 15 mm thick layer of gypsum plaster comprising 30 wt.% of microencapsulated phase change material. The model was validated with data obtained from experiments with thermally activated panels. The model was developed in MATLAB and subsequently implemented as a TRNSYS type. The paper reports the development of a quasi 1D model of a thermally activated layer with phase change material. A substantial simplification of the simulated problem is usually necessary to reduce the computational demand. Therefore, the computational demand of simulation models of buildings or HVAC systems can be quite constraining for their practical application. Simulations of building performance or HVAC systems performance usually cover a time period of several weeks, months or even a year.
Trnsys model type 3258 code#
Trnsys model type 3258 full#
Due to the full integration, the required input data is greatly reduced and less prone to error. It is simply an expansion of the familiar, user-friendly TRNBuild application. No new input file structure or user interface has to be learned. TRNFLOW is a tool allowing for quick and easy calculation of natural ventilation, passive night cooling, double facades and exhaust airshafts. TRNFLOW represents a major step forward in building simulation with TRNSYS. The existing GUI TRNBuild was extended to allow for entry of the data needed for the airflow model, ensuring a user-friendly coupling of the applications. An internal solver, optimized for this task, iterates in each time step between the two models until their solutions are consistent. TRNFLOW integrates the multi-zone airflow model COMIS into type 56. To account for this situation, coupling with an airflow model is an absolute must. The TRNSYS thermal multi-zone building model, type 56, requires airflows between zones as input values however, in natural ventilation systems, these depend on wind pressures and the inside and outside temperatures.
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