Numerical simulation of a combination of a new solar ventilator and geothermal heat exchanger for natural ventilation and space cooling

Kalantar, Vali; Khayyaminejad, Amirhossein

doi:10.1007/s40095-021-00463-4

Cited by 10 publications

(4 citation statements)

References 44 publications

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“…The authors found that the basic natural materials used there in buildings were excellent thermal insulators for the severe ambient temperatures of the area. Most of the studies presented above were devoted to the conversion of geothermal energy for heating and power applications [24][25][26]; however, few, if any, studies investigated the use of a geothermal heat-sink for dissipating the heat released in absorptioncooling systems. In this paper, a feasibility study is presented, using a geothermal heatsink for the condenser and the absorber of low-capacity water-LiBr single-and doubleeffect absorption-cooling cycles operating in hot climates.…”

Section: System Modellingmentioning

confidence: 99%

Performance Analysis of Low-Capacity Water–LiBr Absorption–Cooling Systems Using Geothermal Heat-Sinks in Hot Climates

et al. 2023

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This paper addresses the use of a geothermal heat-sink to remove the heat released in domestic-sized single and double-effect water–LiBr absorption chillers operating in hot climates. This study is the continuation of a previous work, which demonstrated the operational constraints of these absorption chillers working in hot Algerian climate-zones. After localizing the non-operation zones for both systems, the thermo-physical properties of the soil at several depths are investigated for the implementation of the underground heat-exchanger. This heat-exchanger is connected to the condenser and the absorber of both systems, to supply cooling water at inlet temperatures of 33 °C in hot climate conditions, with ambient temperatures varying from 38 °C to 42 °C. The results show a steady operation for both absorption chillers in climate conditions which had not previously allowed the two systems to operate in water or air-cooled modes. A maximum coefficient of performance of 0.76 and 1.25 is obtained for single- and double-effect absorption cycles, respectively, with chilled water at 7 °C. The underground-tube length required is between 4.5 and 18 m, depending on the absorption-cycle configuration and the temperature of the chilled water.

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Section: System Modellingmentioning

confidence: 99%

Performance Analysis of Low-Capacity Water–LiBr Absorption–Cooling Systems Using Geothermal Heat-Sinks in Hot Climates

et al. 2023

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“…As it can be seen hot outdoor air is cooled in EAHE and then the cool air enters the building and after cooling the air, air flows into the solar chimney, then its temperature increases and then 144-3 flows out of the building. Based on their results [17] the SC height and diameter are 6 and 1 meters, respectively. The SC is equipped with 3 fins.…”

Section: Problem Statementmentioning

confidence: 99%

“…Based on their findings, they designed a coupled system that could meet the thermal comfort requirements of the occupants. In study by Kalantar and Khayyaminejad [17], they studied an SC-EAHE. They introduced a new circular geometry for SC made out of glass with a fin in the center of SC.…”

Section: Introductionmentioning

confidence: 99%

“…In this research article, the thermal performance of the SC-EAHE system [17] is investigated under Las Vegas weather conditions. Furthermore, the effectiveness of the PCM integrated roof on the natural ventilation and cooling performance is determined, and the effect of PCM layer thickness is studied by selecting four different thicknesses.…”

Section: Introductionmentioning

confidence: 99%

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Passive Cooling Strategy for Reducing Load in a Building with an Integrated PCM on the Rooftop

Khayyaminejad,

Fartaj

2023

International Conference on Fluid Flow and Thermal Science

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Increasing energy consumption is a critical worldwide challenge. Based on the gathered data, heating, ventilation, and air conditioning systems in residential sectors consume 40% of the provided energy, primarily from non-renewable sources. To overcome this challenge, scientists are actively working to reduce reliance on fossil fuels by adopting renewable energy resources. In this research article, the thermal performance of a natural ventilation system within a building in Las Vegas by implementing phase change material during the hottest day of summer is investigated. The city of Las Vegas is selected because of its hot and arid climate. This system includes a solar chimney, an earth-to-air heat exchanger, and phase change material. This system is simulated in ANSYS Fluent software, and the RNG 𝑘𝑘 − 𝜀𝜀 is selected as the turbulence model. The n-Henicosane is chosen as a phase change material to evaluate its impact on the cooling load when placed on the roof. Furthermore, the effect of phase change material layer thickness on the thermal performance of the natural cooling system is studied. The natural ventilation system reduces the peak indoor temperature by 15.5 K and saves 28.19 kW of energy during the day. Based on the simulations, the optimum thickness obtained is 70 mm. After integrating phase change material with this thickness in the building, the maximum indoor temperature is further reduced by 2.5 K to reach 298.5 K. This system at the peak load cuts 81% of the energy consumption and saves 33.21 kW in 24 hours. In conclusion, incorporating PCM into a building rooftop with a natural ventilation system is a prudent option in reducing the indoor temperature and energy demand in a hot and arid climate.

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Enhancing thermal performance and optimization strategies of PCM-integrated slab-finned two-fluid heat exchangers for sustainable thermal management

Jalilian,

Momeni,

Fartaj

2024

Journal of Energy Storage

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Numerical simulation of a combination of a new solar ventilator and geothermal heat exchanger for natural ventilation and space cooling

Cited by 10 publications

References 44 publications

Performance Analysis of Low-Capacity Water–LiBr Absorption–Cooling Systems Using Geothermal Heat-Sinks in Hot Climates

Performance Analysis of Low-Capacity Water–LiBr Absorption–Cooling Systems Using Geothermal Heat-Sinks in Hot Climates

Passive Cooling Strategy for Reducing Load in a Building with an Integrated PCM on the Rooftop

Enhancing thermal performance and optimization strategies of PCM-integrated slab-finned two-fluid heat exchangers for sustainable thermal management

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