Abstract
Shallow geothermal energy is stable and clean. Using a heat pump to produce groundwater and realize heating and cooling can effectively prevent haze and reduce energy consumption. To reduce engineering costs, many buildings in Beijing, China, plan to utilize single-well groundwater source heat pumps. Numerical modeling is an effective way to gain an understanding of thermal transport processes. However, wellbore-reservoir coupling and the uncertainty of productivity due to geological parameters make simulation difficult. A wellbore-reservoir-integrated fluid and heat transport model is defined by T2Well simulator to predict the productivity of a typical single-well system, with consideration of complex geological factors. The model is validated by the analytical model developed in Beijing, China. The fluid processes in the wellbore are described by 1 D non-Darcy flow, and the reservoir 3 D fluid and heat transport processes are calculated. Six crucial factors satisfying a random distribution are used, and for a single well that can supply heat for an area of 9000 m2, the output temperature during the heating season ranges from 11°C to 15°C.
Highlights
Over the past 50 years in China, large amounts of CO2 emissions have been released by burning coal, resulting in serious environmental pollution
When the groundwater water-source heat pumps (GWHPs) system is combined with solar (Weeratunge et al, 2018) or a fresh air pre-conditioner (Wang et al, 2019b), the energy stored in the groundwater can be maximally used and the consumption of the whole heat pump system can be reduced
As the number of wells drilled decreases, the cost of investment of an single-well groundwater source heat pump (SWGSHP) system is one-third to one-quarter that of a traditional GWHP system
Summary
Over the past 50 years in China, large amounts of CO2 emissions have been released by burning coal, resulting in serious environmental pollution. Geothermal heat pumps (GHPs) have become an efficient, economical and environmentally friendly technology (Sarbu and Sebarchievici, 2014) for space heating and air conditioning of residential and commercial buildings in China (Yuan et al, 2012). The capacity of ground-source heat pump (GSHP) systems in China was 11.78 GWt (Zhu et al, 2015a). GWHP systems use groundwater as the carrier of the low-grade heat source, and exchange heat with an evaporator or condenser in the heat pump unit to either absorb or release energy. Among these systems, GWHP systems are widely used in cities with high population densities. SWGSHP systems need aquifers with suitable burial depths and reinjection conditions, and heat breakthrough and reinjection are the critical problems
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