Contributions to System Integration of PV and PVT Collectors with Heat Pumps in Buildings

Manuel Koch,Ralf Dott,S.I Tanabe,M.C Gameiro Da Silva,H Zhang,J Kurnitski,P Wargocki,L Mazzarela,C Inard,I Nastase,G Cao

doi:10.1051/e3sconf/201911101061

Abstract

A common approach to improve self-consumption of photovoltaic (PV) generation in buildings with heat pumps (HP) is to overload the thermal storage capacities during times with surplus PV generation (hereinafter referred to as thermal overloading). The impact of battery capacity and domestic hot water (DHW) consumption on the effectiveness of this method in a single-family home (SFH) is evaluated through numerical simulations. Increased battery capacity is shown to decrease the effectiveness of thermal overloading. Regarding DHW consumption, temporal concentration is shown to have a stronger influence on the effectiveness of thermal overloading than total energy. Furthermore, the potential of photovoltaic-thermal collectors (PVT) as heat exchangers for air/brine/water heat pumps (ABWHP) is estimated. The results show that the properties of PVT collectors with high thermal conductivity are in the feasible range for application in a well-insulated SFH in Central European climate.

Highlights

Recent years have seen an increase in rooftop PV and heat pumps for residential heating [1] [2]
The simulation results indicate that the potential for improving SC through thermal overloading in a single-family home (SFH) is rather limited
The variation of domestic hot water (DHW) consumption patterns are of comparable significance to the potential of thermal overloading

Summary

Introduction

Recent years have seen an increase in rooftop PV and heat pumps for residential heating [1] [2]. Two contributions to this goal are made: Firstly, numerical simulations are used to evaluate the effectiveness of improving self-consumption of PV generation in a SFH through thermal overloading in dependence of battery capacity and DHW consumption. Heat pumps with control systems maximizing self-consumption of PV generation have the potential to use the thermal masses of DHW storage and the building itself to alleviate this problem, especially in buildings with underfloor heating or thermally activated building systems. This potential depends on many parameters and boundary conditions. A realistic selection thereof is crucial for the validity of the evaluation

Results

Discussion

Conclusion