![]() Due to the linearity of the underlying equations, you can simply multiply the value with any other temperature amplitudes to get the corresponding heat-fluxes, e.g. The temperature on the opposite side of the wall is assumed to be held constant. The value describes the amplitude of the heat-flux (=maximum value) caused by a 1 K (☌) temperature swing. The calculation result value thermal admittance describes the ability of a surface to absorb and release heat (energy) upon a periodic sinusoidal temperature swing with a period of 24h. The restriction to periodic lengths of 24 hours is also reasonable, as only within this 24h time-frame you can really expect a cyclic temperature variation. The sinusoidal shape is appropriate since the actual, average daily temperature swings largely correspond to sine-waves – or have at least a dominant sinusoidal component (see Fourier theorem). ![]() Even if this sounds like a severe limitation, it is actually an appropriate and useful assumption. To analytically solve these equations the boundary conditions (temperatures or heat-fluxes), as well as the resulting variables (temperatures and heat-fluxes), are assumed to be of a sinusoidal shape having a period of 24 hours. ![]() ![]() The calculations are carried out by utilizing matrices of complex numbers. Without explicitly mentioning it, the standard is using well-known calculation methods that are used in electrical engineering to describe the behavior of components in alternating current circuits. The following calculations are based on the calculation methods as described in standard ISO 13786. However, to fully understand the topic or for special applications, I still recommend reading the whole text below… Introduction I regard the other calculation results (time shifts, periodic transmittance…) as being of minor importance. Therefore to achieve high thermal capacity you will have to choose a material having a high thermal conductivity and density of this topmost internal layer. As you will see, this property depends mainly on the internal surface layer – up to a few centimeters or even millimeters below the surface. By increasing the internal mass your wall, floor or ceiling should be able to absorb most of the solar inputs during the day and release the accumulated heat through natural ventilation during the night.įor this purpose, you will have to maximize the resulting figure “ internal areal heat capacity” in the tool. This will help to reduce the daily temperature swings inside the building. Putting it in a nutshell, the most important application for the tool will be the optimization (=maximisation) of thermal mass on the interior surfaces of buildings. The calculated flux: 1.47E10 ph/s.Summary for users not willing to read the whole text… The depletion layer was 53 microns, diffusion length: 0, count was 163909 cts at 1E-6 gain. The diode current amplifier gain in A/V. ![]()
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