Simulation of fluid flow in an earth-air heat exchanger with the open loop system

Manik, T. U. H. S. G.; Panjaitan, M. L.; Sitorus, Tulus Burhanuddin

doi:10.1088/1757-899x/420/1/012026

Cited by 10 publications

(1 citation statement)

References 7 publications

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“…Two parameters can be performed to measure the effectiveness of heat transfer, namely: HE effectiveness (𝜂 HE ) [22] and the logarithmic average temperature difference (∆𝑇 lm ) [23].…”

Section: Ewahe Performance Indicatorsmentioning

confidence: 99%

Optimizing Air Ventilation Cooling With Earth-Water Heat Exchangers in Residential Buildings

Lapisa,

Jasman,

Kurniawan

et al. 2024

TEM Journal

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This study investigated the cooling effect of an Earth Water-Air Heat Exchanger (EWAHE) device for ventilation applications. To address the lack of data on EWAHE performance in moderate climates, we measured temperature parameters (inlet-outlet, indoor-outdoor, water, and soil) continuously for three days. Air temperatures, air flowrate, light intensity are measured using a multi-channel data logger with several sensors. Results showed that the EWAHE effectively reduced indoor air temperature by an average of 7.5°C with a maximum reduction of 9.3°C, offering a promising passive cooling solution for buildings. The primary limitation of this study is that it requires open space around the building to place the device, so this method is inappropriate for building in a dense urban area. Future studies could investigate the association between ground-water cooling effect and natural ventilation without using energy for air circulation.

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Section: Ewahe Performance Indicatorsmentioning

confidence: 99%

Optimizing Air Ventilation Cooling With Earth-Water Heat Exchangers in Residential Buildings

Lapisa,

Jasman,

Kurniawan

et al. 2024

TEM Journal

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Experimental study of solar adsorption refrigerator using a parabolic collector

Putra

Sitorus

Hutasoit

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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Several alternative energy sources have been developed; one of them is solar energy to overcome the future energy crisis. Solar energy can be used as a source of heat energy, used very much, one of which is on the adsorption cycle refrigerator. The adsorption cycle refrigerator tested has three main components, namely the parabolic collector, condenser, and evaporator. In this research, the three main components are made of aluminum because they have a high thermal conductivity value and are resistant to corrosion due to water or refrigerant used. The pairs of adsorbent and refrigerant used were active powder carbon of 10 kg and methanol of 3 liters. The research purpose is to determine the maximum temperature at the collector, the minimum temperature in the cooled water, collector efficiency, and the COP value of the system. The experiment procedure is by heating the solar collector from 08.00 AM-05.00 PM (GMT+7), while the natural cooling process takes place from 05.00 PM-08.00 AM (GMT+7). The results obtained that the maximum temperature of the collector is 126.56°C. The minimum temperature of the water is -0.09°C, the maximum parabolic collector efficiency is 53.39%, and the maximum COP value is 0.000956.

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Utilization of magnetic devices to improve the performance and reduce gas emissions of Otto engine

Hazwi

Sitorus

Arjuna

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Utilization of magnetic instrument is one effort to improve the performance and reduce exhaust emission produced by Otto engine. The experiments are done by varying the engine speed and variation of magnetic instrument mounting distance to the inlet valve when entering the combustion chamber. A magnetic instrument is installed in the intake manifold, before heading into the combustion chamber. The experimental results show that it is found that there is an increase in thermal efficiency and decreasing of fuel consumption when the engine uses 2500 gauss magnetic instrument ranging from 5.99 to 22.02%. The emissions of exhaust gas produced also reduced for CO and HC levels about 6-20%.

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Simulation of fluid flow in an earth-air heat exchanger with the open loop system

Cited by 10 publications

References 7 publications

Optimizing Air Ventilation Cooling With Earth-Water Heat Exchangers in Residential Buildings

Optimizing Air Ventilation Cooling With Earth-Water Heat Exchangers in Residential Buildings

Experimental study of solar adsorption refrigerator using a parabolic collector

Utilization of magnetic devices to improve the performance and reduce gas emissions of Otto engine

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