Introduction
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Hysopt incorporates an extension of the DIN 1988-300 (2012) standard into the Hysopt software. We have extended the calculation to cope with simultaneous central heating and domestic hot water usage, and with combination of power needed in mixed systems.
In the example below, there is a shower- and a kitchen tap. When the flow rates are summed the total flow rate is 0.22 l/s, When using the simultaneous factor this becomes 0,17 l/s. For one satellite unit the difference between total and simultaneous flow rate is quite small, in case of a building with several units the simultaneous flow rate can go to 10% of the total flow rate which have a big impact on the pipe selection.
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The satellite unit must first be "parameterized" according to the manufacturers specifications, by clicking on the pencil a pop up will appear where the user can fill in the manufacturers parameters. The UA-value is calculated according the parameters.specifications (see below, parametrize satellite unit). In the graph below it is shown that the UA-value is strongly depended on the primary and secondary flow rates, so in order to use the correct UA-value according the design flows (primary and secondary) the constant Cspecs is incorporated, which is calculated with the manufacturers specifications, then the UAdesign is calculated.
Furthermore the design flow rate of DHW is determined as the maximum flow rate from the Eco-design draw-off pattern (S, M, L, XL - XXL) that can be set by the pull-down menu (see usage pattern). For simulations the draw-off pattern between the apartments can be shifted in time so not all apartments use DHW at the same time. The requested design temperatures can be filled in the upper fields.
