.BuildingSystems.Technologies.ThermalStorages.BaseClasses.BuoyancyModels.Buoyancy1

Information

The Buoyancy model increments the heat exchange between layers when the upper layer is colder than the lower one.

Main equations

The Buoyancy effect is defined by the following equation, Q=G*dT*nEle^exp_nEle

Typical use and important parameters

G. Its value determines the buoyancy effect and is defined as, G = if nEle < 10 then 0.8*nEle+16 else 26-0.2571*nEle, see reference.

Validition

Technical information and measurements from the commercial DHW tank Vitocell 100-V, type CVW of 390 l were used to tune the parameters of the model, see references. Furthermore, the buoyancy model is valid for values of nEle between 5 and 40.

References

The Buoyancy Model is based on the following reference; "De Coninck et al. (2013) - De Coninck, R., Baetens, R., Saelens, D., Woyte, A., & Helsen, L. (2013). Rule-based demand side management of domestic hot water production with heat pumps in zero energy neighbourhoods. Journal of Building Performance Simulation".

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