Hybrid Heat Pump Design Strategies to Obtain Net-Zero Building

All developed and developing countries seek to take action to avoid the increasingly evident catastrophic impacts
of climate change and global warming. Geothermal energy has great potential for heating to obtain “Energy efficient
buildings “and “Net Zero Energy Building” concepts as defined by the European Union. Heat pump applications have
significantly improved recently with their commitment to net-zero buildings. They present a huge potential for hybrid
energy-efficient applications in the world. This study profoundly examines the investigated large-scale heat pump (HP)
systems and their hybrid design approaches assisted by gas boilers. Although the various design concepts for the HPs are
available today, it isn't easy to find comprehensive information on large-scale HPs and their hybrid designs. Therefore, in
this study, a performance study has been carried out for the hybrid Ground Source Heat Pumps (GSHPs) system in the UK.
The actual hybrid GSHP system design is presented. The results suggest that hybrid heating saves a considerable amount
of GHG emissions depending on the GSHP size and improves the unit's efficiency compared to the conventional heat
pump. The savings of CO2 emissions of the GSHP heating system are determined as 4.37 tons/year savings for gas and
3.52 tons/year savings for electricity under validated conditions. This work can provide theoretical support and technical
guidance for future research and engineering applications of the hybrid GSHP system. Moreover, further work is needed
to understand the role hybrid heat pumps play in each building such as energy-efficient residential, public sector,
institutional, and agricultural structures in the UK.

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