Performance of a residential ground source heat pump system in sedimentary rock formation

Han, Chanjuan; Yu, Xiong

doi:10.1016/j.apenergy.2015.12.003

Cited by 57 publications

(22 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reduced temperature of the pipe wall causes a heat flux from the ground towards the GHE pipe. The 89 physical description for this process is mathematically expressed as follows.157 2.2 Model geometry and boundary conditions 158The computational models are developed based on a prototype vertical GCHP system installed in a three-story 159 residential house located in Cleveland, OH, United States [51]. The house is a three-story residential house with 260 160 m 2 (2800 ft. 2 ) floor space.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Sensitivity analysis of a vertical geothermal heat pump system

Han

2016

Applied Energy

Self Cite

123

View full text Add to dashboard Cite

This paper conducts sensitivity analyses on factors affecting the performance of vertical geothermal heat pump system, aiming to formulate design and operation strategies to improve its performance. It firstly describes the development of a 3D coupled Finite Element Model (FEM), which is utilized to simulate the steady state and transient behaviors of geothermal heat exchanger (GHE). The model holistically couples the heat exchange processes between pipe fluid flow, grouting backfill material, and adjacent ground associated with GHE. The model is firstly validated by comparison with the experimental data from an in-service GHE. Base on the calibrated model, a series of sensitivity analyses are conducted on the influence of geological, design, and operational factors intermittent operation mode of GHE achieves higher such as the initial ground temperature profile, GHE pipe installation depth, circulation fluid flow velocity, inlet temperature, subsurface water flow velocity, and material thermal properties. It also assess the behaviors of GHE under continuous operation versus intermittent operation modes. The results show that both design parameter (i.e., GHE pipe installation depth) and operational parameters (i.e, circulation fluid flow velocity) have major influence on the GHE performance. For a certain design length of GHE, the GHE performance improves with higher circulation fluid flow velocity until beyond a critical velocity. For GHE working in the heating mode, the heat extraction by GHE increases with decreasing fluid temperature at the inlet. In the geological factor aspect, the thermal conductivity of the ground material plays a very important role on the GHE performance operating in the continuous operation mode, while its specific heat capacity exerts no appreciable influence. However, for intermittent operation mode, both thermal conductivity and specific heat capacity of the ground, particularly the grouting materials, affect the ground thermal energy extraction. The results also showed that the presence of subsurface ground water flow improves the heat exchange of GHE. Operation wise, the GHE achieves higher performance and Coefficient of Performance (COP) under intermittent operation mode than under continuous operation mode. These observations point to ways to improve the performance of GHE from both design and operation aspects. Introduction1 Over the past decades, the depletion of fossil energy along with the demand to reduce carbon footprint in the 2 energy sector has promoted the development of renewable energy techniques including solar, wind, geothermal energy, 3 bioenergy, hydropower, etc. The renewable energy revolution has spread worldwide, which accounted for 19% of the 4 global energy generation in 2012 and quickly increased to 23% in 2013 [1]. In the United States, the cumulative 5 installation of renewable electricity capacity has doubled since 2000. Particularly, the United States led the world in 6 energy production from geothermal and biomass in 2013 [1]. There has been adoption o...

show abstract

mentioning

confidence: 99%

“…The computational models are developed based on a prototype vertical GCHP system installed in a three-story 159 residential house located in Cleveland, OH, United States [51]. The house is a three-story residential house with 260 160 m 2 (2800 ft. 2 ) floor space.…”

mentioning

confidence: 99%

Sensitivity analysis of a vertical geothermal heat pump system

Han

2016

Applied Energy

Self Cite

123

View full text Add to dashboard Cite

show abstract

“…[13][14][15][16]. Studies on GCHPs applications in European [17][18][19][20][21], American [22,23] and Asian climates [24,25] have been performed, in single residential or office building cases. Analyses of economic feasibility and environmental benefits for residential buildings were carried out by Lu et al [26], Morrone et al [27], and Chang et al [28].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Energetic, Economic and Environmental Performance of Ground-Coupled Heat Pumps

et al. 2018

View full text Add to dashboard Cite

Ground-coupled heat pumps (GCHPs) have a great potential for reducing the cost and climate change impact of building heating, cooling, and domestic hot water (DHW). The high installation cost is a major barrier to their diffusion but, under certain conditions (climate, building use, alternative fuels, etc.), the investment can be profitable in the long term. We present a comprehensive modeling study on GCHPs, performed with the dynamic energy simulation software TRNSYS, reproducing the operating conditions of three building types (residential, office, and hotel), with two insulation levels of the building envelope (poor/good), with the climate conditions of six European cities. Simulation results highlight the driving variables for heating/cooling peak loads and yearly demand, which are the input to assess economic performance and environmental benefits of GCHPs. We found that, in Italy, GCHPs are able to reduce CO 2 emissions up to 216 g CO 2 /year per euro spent. However, payback times are still quite high, i.e., from 8 to 20 years. This performance can be improved by changing taxation on gas and electricity and using hybrid systems, adding a fossil-fuel boiler to cover peak heating loads, thus reducing the overall installation cost compared to full-load sized GCHP systems.

show abstract

“…Thus, the residential heat pump systems can be divided into the following categories: air source heat pump system (ASHP), ground source heat pump system (GSHP), waste water source heat pump system (WWSHP), and hybrid heat pump system. Depending on the type of heat source, the GSHP can be classified into three types: groundwater heat pump system (GWHP), ground coupled heat pump system (GCHP), and surface water heat pump system (SWHP) [16]. The advantages and limitations of each residential heat pump system are presented in Table 1.…”

Section: Types Of Industrial Heat Pumpsmentioning

confidence: 99%