Volume 48

Comparative Thermodynamics Analysis of Geothermal and Air Source Heat Pump for Heating and Cooling – A Case Study in Beijing Wang Jiachen, Zhang Fan, Ji Dongxu

Abstract

The heat pump is a highly efficient and environmentally friendly technology for converting electricity into heat with efficiencies larger than one. Recently, air-source heat pumps (ASHPs) have seen widespread deployment across various climate zones for building heating and cooling purposes. Conversely, ground-source heat pumps (GSHPs) offer even greater efficiencies but have seen 15% of total heat pump installations. This article intends to conduct a comprehensive thermodynamic comparison analysis of adopting an Air-source heat pump (ASHP) and a ground-source heat pump (GSHP) for building heating and cooling in Beijing using TRNSYS simulation. The TRNSYS model leverages city-level building information to simulate the load profile of the building. Additionally, it incorporated the impact of occupants’ energy behavior including the window-opening schedule, heating and cooling temperature, effective area, and number of heat pumps to form 3 scenarios. As a result, the GSHP outperform the ASHP with around 30% higher efficiency and 45% reduction of total power consumption.

Keywords Heat pump, carbon neutrality, thermodynamic analysis, TRNSYS, cost prediction, renewable energy, energy-saving