Utilising Unused Energy Resources for Sustainable Heating and Cooling System in Buildings: A Case Study of Geothermal Energy and Water Sources in a University

Park, Kwon Sook; Kim, Seiyong

doi:10.3390/en11071836

Cited by 9 publications

(10 citation statements)

References 16 publications

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“…This reasoning seems to find support in the literature: several examples (see e.g. [54,55]) can be found illustrating how models of transient fluid transport inside the tubes would be justified only for much smaller time scales 4 . There are different ways to simplify the implementation of fluid flow, in order to reduce the computational time; for example, in [24,42] the convective heat transfer associated with the fluid flow was simulated by an equivalent solid with the same thermophysical properties of the actual circulation fluid.…”

Section: Brine Flow Modellingmentioning

confidence: 58%

“…One can see that the difference is negligible, confirming our assumption at the beginning of this section that we can safely ignore the fluid flow. We accordingly model the U-pipes as made of concrete with constant T, 4 In particular, Ref. [54] shows that a steady-state, a transient and a semi transient model converge already after ∼ 3 hrs.…”

Section: Brine Flow Modellingmentioning

confidence: 99%

“…Such a requirement clearly demands an extensive use of renewable sources. A recent review [2] on the utilization of geothermal energy [3,4] revealed that, by 2015, 49 countries invested over 20 billion USD in geothermal plants, which resulted in energy savings of ca 52.5 million tonnes of equivalent oil. This prevented respectively 46 and 148 million tonnes of carbon and CO2 from being released into the atmosphere every year.…”

Section: Introductionmentioning

confidence: 99%

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Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

Ferrantelli

Fadejev

Kurnitski

2019

Preprint

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As the energy efficiency demands for future buildings become increasingly stringent, preliminary assessments of energy consumption are mandatory. These are possible only through numerical simulations, whose reliability crucially depends on boundary conditions. We therefore investigate their role in numerical estimates for the usage of geothermal energy, performing annual simulations of transient heat transfer for a building employing a geothermal heat pump plant and energy piles. Starting from actual measurements, we solve the heat equations in 2D and 3D using COMSOL Multiphysics and IDA-ICE, and discover a negligible impact of the multiregional ground surface boundary conditions. Moreover, we verify that the thermal mass of the soil medium induces a small vertical temperature gradient on the piles surface. We also find a roughly constant temperature on each horizontal cross-section, with nearly identical values if the average temperature is integrated over the full plane or evaluated at one single point. Calculating the yearly heating need for an entire building we then show that the chosen upper boundary condition affects the energy balance dramatically. Using directly the pipes’ outlet temperature induces a 54% overestimation of the heat flux, while the exact ground surface temperature above the piles reduces the error to 0.03%.

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Section: Brine Flow Modellingmentioning

confidence: 58%

Section: Brine Flow Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

Ferrantelli

Fadejev

Kurnitski

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…A recent review [2] on the utilization of geothermal energy [3,4] revealed that, by 2015, 49 countries invested over 20 billion USD in geothermal plants, which resulted in energy savings of ca 52.5 million tonnes of equivalent oil. This prevented respectively 46 and 148 million tonnes of carbon and CO 2 from being released into the atmosphere every year.…”

Section: Introductionmentioning

confidence: 99%

Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

2019

View full text Add to dashboard Cite

As the energy efficiency demands for future buildings become increasingly stringent, preliminary assessments of energy consumption are mandatory. These are possible only through numerical simulations, whose reliability crucially depends on boundary conditions. We therefore investigate their role in numerical estimates for the usage of geothermal energy, performing annual simulations of transient heat transfer for a building employing a geothermal heat pump plant and energy piles. Starting from actual measurements, we solve the heat equations in 2D and 3D using COMSOL Multiphysics and IDA-ICE, discovering a negligible impact of the multiregional ground surface boundary conditions. Moreover, we verify that the thermal mass of the soil medium induces a small vertical temperature gradient on the piles surface. We also find a roughly constant temperature on each horizontal cross-section, with nearly identical average values when either integrated over the full plane or evaluated at one single point. Calculating the yearly heating need for an entire building, we then show that the chosen upper boundary condition affects the energy balance dramatically. Using directly the pipes’ outlet temperature induces a 54% overestimation of the heat flux, while the exact ground surface temperature above the piles reduces the error to 0.03%.

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“…It is a passive technology that consumes low or no energy with almost no emissions as compared to conventional HVAC technologies, that is why it is termed as a green building technology [9]. EAHE consumes geothermal energy, which is renewable and hence sustainable source of heating and cooling in buildings [10]. EAHE reduces greenhouse gases emissions as it does not use any refrigerant as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization of Earth to Air Heat Exchanger Using Response Surface Method

et al. 2019

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The achievement of sustainable energy goals warrants keen interest in promoting efficient buildings and renewable energy resources. Prominent among the energy-efficient building technologies is geothermal energy, which has a significant margin for improving energy utilization related to Heat, Ventilation, and Air Conditioning (HVAC). However, the efficient extraction of geothermal energy for HVAC applications requires stringent control of geometric parameters, boundary conditions, and environmental conditions. In this study a new approach has been devised to optimize the open loop Earth to Air Heat Exchanger (EAHE) system using a statistical optimization technique i.e., Response Surface Method (RSM). The study was conducted in the soil and weather conditions of Peshawar city in Pakistan. Parametric analysis was conducted for the three influencing variables, i.e., the pipe length, diameter, and air velocity using the EAHE model. The soil model predicts temperature in the range 20–26 °C for Peshawar at a depth above 3 m. Response Surface method was used to optimize the pipe length, diameter, and air velocity of the EAHE system. Analysis of Variance (ANOVA) indicates that all the three factors are significant. The EAHE system can effectively reduce the temperature by 15–18 °C and compensate the cooling load of single room for the parameters in the ranges of 50–70 m for the length, 0.18–0.25 m for the diameter, and 5–7 ms−1 for the air velocity. A regression equation is developed to predict the cooling load for any input values of the three influencing variables according to the weather and soil conditions.

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Utilising Unused Energy Resources for Sustainable Heating and Cooling System in Buildings: A Case Study of Geothermal Energy and Water Sources in a University

Cited by 9 publications

References 16 publications

Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

Energy Pile Field Simulation in Large Buildings: Validation of Surface Boundary Assumptions

Parametric Optimization of Earth to Air Heat Exchanger Using Response Surface Method

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