The thermal stores in Hysopt can be used for central heating (CH) or domestic hot water (DHW).
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Both parameters must be locked in order to apply the filled in values. If not, the Optimiser will propagate both the design heat flow and temperature regime are propagated from the end-unit side (secondary side) through the thermal store to the production side (primary side).
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The diameter is needed to specify the height and weight of the thermal store and each cell. The U-value is also needed to calculate the thermal losses to the environment and represents the insulation grade of the thermal store. By default, the U-value is set to 0.4 W/m2Km²K.
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For each connection side, the height of the supply and return connection can be altered by the user. For instance, when a pipe is connected to the middle of the thermal store, the user can simply enter 50%.
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Remark: For units with electrical resistance, the design heat flow is needed for simulation not for design since there is no primary side to propagate to. The design heat flow is used in simulation to specify the amount of thermal power going into the thermal store. Seeing as it is a production unit as well, a control signal is needed to activate and/or modulate the thermal power delivered by the electric resistance.
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Domestic hot water
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Domestic hot water store units are similar to the central heating store units, except that they no longer have a secondary gate. Instead, a tap profile from the control library must be attached in order to generate a load towards the heating store. More information on a tap profile can be found here: Tap profile generators As there is no longer a circuit downstream of the BC, the design heat flow & temperature regime from the BC’s parameters are propagated further upstream, even if those values aren’t locked.
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