Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

Lee, Kwang-Seob; Kang, Eun-Chul; Kim, Yu-Jin; Lee, Euy-Joon

doi:10.3390/en12214047

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…Lee et al studied ground air heat exchanger with a spirally corrugated plate. The study results indicated inlet-outlet temperature and pressure difference, respectively, of 4.02 °C and 14.43 Pa for 0 plates, 4.21 °C and 248.6 Pa for four plates, 5.28 °C and 469.23 Pa for six plates, and 5.81 °C and 723.02 Pa for eight plates (Lee et al, 2019). Liu et al studied the feasibility and performance of ground source heat pump under three different climate cities in China with TRNSYS simulation.…”

Section: Introductionmentioning

confidence: 92%

Hybrid Solar Geothermal Heat Pump System Model Demonstration Study

et al. 2022

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In this paper, the development and demonstration of a hybrid solar geothermal heat pump polygeneration system is presented. The poly-generation system has been designed, modeled, and simulated in TRNSYS software environment. Its performance was assessed followed by installation and demonstration at a demo site in Cheongju, Korea. The space heating and cooling load of the building is 13.8 kW in heating mode at an ambient temperature of −10.3°C and 10.6 kW in cooling mode at an ambient temperature of 32.3°C. The simulation data were compared with the field demo data using ISO 13256. The results showed that the model data compare well with the demo data both in heating and cooling modes of operation. At a source temperature of 16.7°C, the heat pump lab performance data-based COPc shows 9.9, while demonstration COPc shows 10.3, thus, representing 4.3% relative error. The heat pump source temperature decreased by 4.0°C from 20.9°C to 16.9°C due to ground heat exchanger coupling and resulted in a COPc increase by 13.3% from 8.5 to 9.8. When compared at the design conditions (outside temperature of 32.3°C), the TRSNYS model overestimated the demonstration site data by 12%, 9.3 vs. 8.1 kW with power consumption of 3.1 vs. 2.2 kW. The hybrid polygeneration system power consumption decreased by 1.2 kW when ambient temperature decreased from 35°C to 25°C.

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Section: Introductionmentioning

confidence: 92%

Hybrid Solar Geothermal Heat Pump System Model Demonstration Study

et al. 2022

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“…The impact of using different materials such as PVC, stainless steel, and copper, for the construction of an EAHE has been studied (Bansal et al, 2010;Lee et al, 2019;Serageldin et al, 2016), and it has been concluded that the use of high conductivity materials has no significant impact over the thermal performance, due to the wall thickness of these types of pipes. Hence, it can be opted to use cheap and easy to manipulate materials for the construction of an EAHE.…”

Section: Introductionmentioning

confidence: 99%

Air conditioning of an off-grid remote school with an earth to air heat exchanger coupled indirectly to a solar cooling system

Ríos,

Velázquez,

Aguilar-Jiménez

et al. 2024

Preprint

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This work presents the results of indirectly coupling an Earth to Air Heat Exchanger to a 35 kW absorption cooling system. The study considers the weather, building, and soil conditions of a school located in the off-grid remote community of Puertecitos, Baja California, Mexico. TRNSYS simulation software was used to analyze the thermal behavior of the Earth to Air Heat Exchanger under different operation modes, in order to reduce the thermal load of the classrooms. The results show that during the months of May and June an Earth to Air Heat Exchanger with a diameter of 0.15 m, operating from Mondays to Fridays with and mass flow of 715 kg/h, is capable to reduce the thermal load of each classroom by 268.4 kWht, equivalent to 25% of the energy to be removed for maintaining the classrooms at 25°C, which is reflected in a reduction of 12.89% and 18.25% of the electrical energy and water consumption, respectively. For the period from August to October, the thermal load was reduced by 225.2 kWht, equivalent to 15.4% of the energy to be removed for maintaining the classrooms temperature at 25°C, causing an increase of 1.33% in electrical energy consumption, but reducing the consumption of auxiliary heat and water by 94.82% and 11.07%, respectively. The annual savings in auxiliary heat, electrical energy and water are 513.52 kWht, 136.05 kWhe and 6,084.03 kg, which represent 94.82%, 4.61% and 14.3% of the annual consumption of these resources.

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“…According to [22][23][24], the most important factors affecting the performance of EAHE are climatic conditions and geographical location, soil type, pipe properties, burial depth and airflow rate. Therefore, many researchers investigated design and optimisation of ground exchangers using sophisticated computer tools.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, many researchers investigated design and optimisation of ground exchangers using sophisticated computer tools. In general, CFD computer tools are used when considering the impact of design aspects on the thermal operation of EAHE, heat transfer between internal air and ground [25], pressure loss [26], burial depth [27] or materials used [23].…”

Section: Introductionmentioning

confidence: 99%

“…Investigations covered parametric performance analysis, including effect of the pipe burial depth and the thermal conductivity of the ground on the exchanger's performance. This tool was also used for an optimisation of the parameters affecting the temperature drop and heat transfer rate from EAHE [30], and a parametric study (including material, turbulent plate quantity and pipe type) of EAHE for an air-towater heat pump [23].…”

Section: Introductionmentioning

confidence: 99%

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Hourly Simulation of an Earth-to-Air Heat Exchanger in a Low-Energy Residential Building

Michalak

2022

Energies

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The earth-to-air heat exchanger (EAHE) is a well-founded and verified solution used in modern buildings both for heating and cooling purposes around the world. However, there is a lack of studies on operation of such devices cooperating with ventilation systems of buildings in hourly time step. In this study, the 5R1C thermal network model of a building from EN ISO 13790 was coupled with the EAHE model from EN 16798-5-1 to calculate hourly outlet air temperature. To improve the effectiveness of the considered solution, an additional algorithm was developed to choose between the EAHE outlet and ambient air as the source of ventilation air. Simulations were conducted in a spreadsheet for a low-energy single-family building. Ground temperature was compared with measurements taken in the considered location. The application of the EAHE with the proposed bypass resulted in a decrease in annual energy use for space heating and cooling from 14.82 GJ and 1.67 GJ to 12.74 GJ and 0.93 GJ, i.e., by 14% and 44%, respectively. Peak hourly heating and cooling thermal power decreased from 2.73 kW and 3.06 kW to 2.21 kW and 2.34 kW. Introduction of a bypass and switching between the EAHE and ambient air as the source of ventilation for the building resulted in annual energy savings of 123 kWh.

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Model Verification and Justification Study of Spirally Corrugated Pipes in a Ground-Air Heat Exchanger Application

Cited by 7 publications

References 19 publications

Hybrid Solar Geothermal Heat Pump System Model Demonstration Study

Hybrid Solar Geothermal Heat Pump System Model Demonstration Study

Air conditioning of an off-grid remote school with an earth to air heat exchanger coupled indirectly to a solar cooling system

Hourly Simulation of an Earth-to-Air Heat Exchanger in a Low-Energy Residential Building

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