A paper of the Graz University of Technology dealing with concrete core activation is now available on the HTflux website. The article summarizes the main findings of the study carried out in the scope of the diploma thesis of Wolfgang Gappmaier. (more…)
This example taken of the diploma thesis of Mr. Wolfgang Pöll shows how HTflux can be used to optimize timber construction details. With the very comprehensive approach of HTflux it is possible to address condensation risk and heat loss at the same time.
To demonstrate the usefulness of the new fluid-dynamic calculation tool, we present a simple but very interesting application. Of course, the method and tool described can be used to simulate the heat transfer of flows of all kinds of fluids such as air, gas, water, oil, refrigerant etc. (more…)
Everything you always wanted to know about your heating system…
In the following example two underfloor heating systems are simulated using the dynamic simulation feature of HTflux. Based on these transient simulations we will reveal the differences in the dynamic behavior between these two systems. (more…)
In his bachelor’s thesis Andreas Schmid of the East Bavarian Technical University of Applied Sciences Amberg-Weiden used HTflux for the hygrothermal assessment and optimization of construction details under exceptional climate conditions. (more…)
The following short demo shows a project created during an HTflux online training session. The capabilities of HTflux regarding dynamic simulation were shown with a simple simulation of a wall-heating system. (more…)
Appropriate for the season and the current cold weather conditions in Europe a new feature has been integrated in to HTflux. The new feature will be available in next version of HTflux (1.10) which will be rolled out soon. It allows the simulation of freezing soil considering latency heat while freezing, as well as the change in thermal conductivity and heat capacity of the frozen ground. (more…)
The following practical example demonstrates how HTflux can be used to efficiently analyze even complex details with little effort. The details shows the connection of a PVC window to a timber frame wall. A comprehensive assessment regarding the condensation risk of the detail can easily be performed using HTflux unique Glaser-2d function. (more…)
The following example demonstrates how efficiently HTflux can be used to calculate precise thermal key figures of an inhomogeneous construction element, e.g. a timber-frame wall. Not only will the thermal transmittance (U-value) of the wall be calculated, but also the dynamic thermal performance figures.
Balcony and cantilever floor insulation – a comparative study regarding thermal and energetic aspects
In the study various insulation methods of a cantilevered slab (e.g. a balcony) are being compared. The study covers only the energetic (heat loss) and thermal aspects of the different cases. Economic, aesthetic and constructive aspects will also have to be considered, but are not part of this review.
The following example demonstrates the possibilities of using the HTflux heat source feature. The task was to optimize a window frame heating for an indoor pool area. The aim of the heating cable design was firstly to avoid condensation at the floor section of the sliding door frame and secondly to prevent damage of the frame caused by freezing. (more…)
HTflux latest feature enables you to process transient thermal simulations. Using the built-in video encoder you can easily create high-resolution videos of the temperature as well as of the heat-flux view or you can export the time-resolved data of the measuring tools (such as temperatures, total heat flux,…) for further analysis. This enables you to calculate dynamic thermal characteristics of your assembly (e.g. periodic thermal transmittance, time shifts, decrement factor,…)
The video shows a simulation of underground cable array exposed to a cyclic daily clear sky photovoltaic load (maximum PV-load). The boundary conditions have been chosen to largely comply with the relevant standard VDE 0276 (20°C surface temperature, adiabatic boundaries below surface). (more…)
HTflux is highly suitable for designing, optimizing or assessing timber constructions. The design of timber constructions can be very demanding from a hydrothermal point of view. HTflux will give you the information you need for this task. It provides precious information for passive house planners, but it’s ease of use make it suitable for the whole construction industry. As an example we present a pitched roof junction detail of a timber frame construction. (more…)
The following example demonstrates the thermal simulation of a warm water underfloor heating system. The task is to examine the temperature- as well as the energy-distribution resulting from the underfloor heating in an internal floor with wall connection. (more…)
A balcony was formed by a cantilevering concrete slab. Since there is no thermal separation this poses a significant thermal bridging issue. Apart from the high energy consumption this can also cause condensation and eventually mold formation due to the low surface temperature on the inside. (more…)
In this classical building physics example HTflux has been used to carry out damage analysis. An external wall had shown significant formation of mould. Reviewing the constructions plans reveals that the planner of the building intended to lessen the impact of thermal bridging by fitting 3cm XPS interior insulation at the base area of the affected wall. (more…)
The following example demonstrates how easily and efficiently HTflux can be used to calculate the energy loss of a thermal bridge. After importing the CAD data in DXF format (e.g. created with AutoCAD or ArchiCAD) you can assign the materials with few mouse clicks. If you have created an import wizard you can even skip this point, as HTflux will assign the materials according to the names of your CAD layers. (more…)
In the present example the combination of flanking diffusion and a disadvantageous roof structure are being examined. The term flank diffusion is used to describe a process when water vapor bypasses a vapor barrier through penetrating into components that disrupt the barrier (e.g. internal walls). (more…)
The following case shows how HTflux can help examining details that are problematic from a hygrothermal perspective. (more…)
The following example demonstrates the simulation of a classical thermal bridge. The plan shows a wooden construction forming an overhanging roof parapet. In the first plan a lateral thermal insulation of the ceiling was not included. Using HTflux it can easily be shown that this setup would lead to a massive thermal bridge. (more…)
Using HTflux to simulate the expected temperatures of a power cable under load is a straight forward process. (more…)