Modular Refurbishment of multi-family Houses with PVT-PCM Heat Pump Systems and self-learning Energy Management

This paper presents a retrofit concept, especially for multi-family houses, where the two retrofit measures are decoupled in time. The heating system is based on a hybrid system with a PVT-driven heat pump and an energy management system that ensures the dynamically optimized use of the different energy sources in terms of minimized CO2 emissions and costs. The renovation concept consists of supplementing an existing gas boiler with a heat pump with SOLINK PVT collectors in the first step. If necessary, the gas boiler can also be replaced with a small investment. In a typical dimensioning, the heat pump capacity is 50 % of the maximum heating capacity, but supplies - partly in parallel operation - about 80 % of the heating energy over the year. If the building envelope is renovated in a second step, the share of the gas boiler can be reduced to zero. However, no energy management solutions are yet available on the market with which optimized and monitored operation with minimized grid power consumption can be realized in a simple manner, especially in multi-family houses and quarters. Hence a predictive and self-learning energy manager has been developed and implemented as cloud-based service. The functionality of the energy manager is investigated and proven on the basis of three properties. In a simulation study, a typical renovation process of a multi-family house is shown in two steps.