Evaluation and improvement of the thermal performance of different types of horizontal ground heat exchangers based on techno-economic analysis

Habibi, Mohammad; Hakkaki-Fard, Ali

doi:10.1016/j.enconman.2018.06.070

Cited by 66 publications

(40 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the motor is assumed to be kept outside of the fluid stream, so the waste heat of the motor impacts the ambient, and f motorloss would have a value of 0. Heat losses of the piping can be calculated by integrating the following equation [10,26,27].…”

Section: Piping Heat Losses and Pump Power Calculationmentioning

confidence: 99%

“…Properties of the water flow at the set point temperature is determined from Holman [29] as are presented in Table 3. According to the pipe shape in cylindrical coordinates, the resistance values of the pipe, insulation, and backfill are obtained from the following equation [27,30].…”

Section: Piping Heat Losses and Pump Power Calculationmentioning

confidence: 99%

“…LCC(30 years) = IC + PV electricity + PV gas (27) IC = IC boiler + IC building insulation +IC radiators + IC pump + IC pipes + IC pipes insulation (28) where IC represents the investment costs and PV represents the present value of the energy for 30 years which can be calculated by the following equation [34]:…”

Section: Life Cycle Cost (Lcc)mentioning

confidence: 99%

See 2 more Smart Citations

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

2019

Self Cite

View full text Add to dashboard Cite

High mountains and cold climate in the north-west of Iran are critical factors for the design of optimized District Heating (DH) systems and energy-efficient buildings. It is essential to consider the Life Cycle Cost (LCC) that includes all costs, such as initial investment and operating costs, for designing an optimum DH system. Moreover, considering climate change for accurately predicting the required heating load is also necessary. In this research, a general optimization is carried out for the first time with the aim of a new design concept of a DH system according to a LCC, while considering all-involved parameters. This optimized design is based on various parameters such as ceiling and wall insulation thicknesses, depth of buried water and heating supply pipes, pipe insulation thickness, and boiler outlet temperature. In order to consider the future weather projection, the mentioned parameters are compared with and without climate change effects in a thirty-year period. The location selection was based on the potential of the region for such a system together with the harsh condition of the area to transport the common fossil fuel to the residential buildings. The obtained results show that insulation of walls is more thermally efficient than a roof with the same area in the selected case. In this case, polyurethane is the best material, which can cause a reduction of 59% in the heating load and, consequently, 2332 tons of CO2 emission annually. The most and the least investment payback periods are associated with the polyurethane and the glass wool insulation materials with the amounts of seven and one years. For the general optimization of the DH system, the Particle Swarm Optimization (PSO) method with a constriction coefficient was chosen. The results showed that the optimal thickness of the polyurethane layer for the thermal insulation of the building exterior walls is about 14 cm and the optimal outlet temperature of the boiler is about 95 °C. It can be also concluded that the optimal depth for the buried pipes is between 1.5 to 3 m underground. In addition, for the pipe with elastomeric insulation layer, the thickness of 2 cm is the optimal choice.

show abstract

Section: Piping Heat Losses and Pump Power Calculationmentioning

confidence: 99%

Section: Piping Heat Losses and Pump Power Calculationmentioning

confidence: 99%

See 1 more Smart Citation

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Wang et al [8] examined tube heat transfer properties at diverse impact angle conditions, and three kinds of heat exchangers with different structures were selected for investigating heat transfer and fluid flow characteristics under different impact angles and different pipe inclinations. Habibi et al [9] established a numerical mode according to 3D fluid dynamics simulation using computational fluid dynamics. Thereafter, the as-constructed model was applied in evaluating the cost of initial installation and heating performance of the horizontal buried pipe.…”

Section: Introductionmentioning

confidence: 99%

Simulation and analysis of buried pipe heat transfer performance under leakage state

et al. 2021

View full text Add to dashboard Cite

Buried pipe leakage can lead to poor heat transfer performance and even system failure. Leakage analysis of buried tube greatly affects the operation condition diagnosis for the heat exchange in buried tube. In this study, the simulation software was applied in analyzing heat transfer process and efficiency of the buried pipes under different leakage conditions. Moreover, changes in outlet temperature, water pressure and flow rate were simulated at different positions and diverse sizes of the leakage port. According to our results, the size of leakage port greatly affected the parameter variation of the outlet port when the system started and stopped, thus affecting the cooling effect. In addition, position of the leakage port also had obvious influence on the physical state of the outlet water.

show abstract

“…They proposed an elaborate economical work for stand-alone and hybrid earth to air tunnel system design was proposed to be outright for each layout and climatology type. Mohammad Habibi and Ali Hakkaki-Fard [25], presented a numerical simulation based on 3D model of horizontal Ground Heat Exchangers with CFD methods was developed by the authors. This simulation for evaluating the thermal efficiency and the first installation price of the horizontal GHEs.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Numerical Investigation of the thermal properties effect on the soil temperature in Adrar region.

Belatrache

Saifi

Harrouz

et al. 2020

AJRESD

View full text Add to dashboard Cite

Geothermal energy is part in various clean sources in the world. The geothermal energy resources originate from the ground and its temperature varies according to depth and its thermal properties. This paper presents a numerical simulation of the soil temperature variation in different thermal properties depending on the nature of the soil. three different Specific heat capacity and thermal conductivity are used in this this simulation and have applied in Adrar city. Three soils A, B and C, each soil has characteristics that are different from the others are presented. The results showed that the soil C is considered the best soil in terms of results in the southern desert region that can be applied to help in ventilation, cooling homes in summer (22°C) and natural heating in winter (31°C). A is considered to be a soil with high thermal insulation and its results can be used for agricultural irrigation applications in desert areas in the summer season because its temperature stabilizes at 26 °C. As an economic vision, it can use the soil B in depth of 3 m to reduce costs, based on the convergence of the results of soil C in this depth, but it's remain less effective

show abstract

Evaluation and improvement of the thermal performance of different types of horizontal ground heat exchangers based on techno-economic analysis

Cited by 66 publications

References 46 publications

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

Optimized Design of the District Heating System by Considering the Techno-Economic Aspects and Future Weather Projection

Simulation and analysis of buried pipe heat transfer performance under leakage state

Modelling and Numerical Investigation of the thermal properties effect on the soil temperature in Adrar region.

Contact Info

Product

Resources

About