Modelling and Simulation of Booster Heat Pump for DHW Preparation in a Multi-Family Building Connected to the District Heating
Abstract
Booster Heat Pumps (HPs) are integrated into the District Heating (DH) networks aiming at increasing the PV-self consumption. In this work, a dynamic model of a booster HP for the preparation of the Domestic Hot Water (DHW) in a typical Austrian multi-family house is developed. A series of dynamic simulations considering different controls, DHW profiles, storage quality, demand for the appliances and common areas, PV and battery sizes are performed to analyse the influence of this technology on the PV self-consumption, electricity demand, thermal energy demand from the DH network and total CO2 emissions. The results show that when appliances are included in the balance, the PV yield available for the booster HP is limited. A non optimal control logic of the booster HP, could lead to an increase in electricity demand from the grid. Moreover, the operation of the booster HP influences the energy demand from the DH and makes the CO2 emission of the building dependent on the energy mix of both DH and electricity grid.