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RISS 인기검색어
- 검색키워드
- 저자 : Abdul Hadi N. Khalifa (검색결과 3 건)
- 무료
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Performance Study of Water Harvesting Unit Working Under Iraqi Conditions
Ali J. Talib,Abdul Hadi N. Khalifa,Ahmed Q. Mohammed 대한설비공학회 2019 International Journal Of Air-Conditioning and Refr Vol.27 No.1
The scarcity of water facing the world is one of the biggest challenges of this century. This challenge requires research plans in the field of water desalination that is not suitable for human use or the harvesting of water from the air. In this work, the performance of the water harvesting unit from the ambient air is studied. For this purpose, a vapor compression system is designed and built, a 372W reciprocating compressor is selected depending on the use of a small family consisting of four persons. The components of the vapor compression system are designed depending on the compressor power. The unit evaporator is modified to condensate the water vapor associated with the air instead of cooling the air. The effect of volume flow rate of air across the evaporator is studied. The range of air volume flow rate is from 224 to 244m3/h, as well as the operation mode of the unit which either continues to condensate or freeze the water vapor on the evaporator is also studied. The result showed that the water harvesting unit can work at a relative humidity as low as about 20%. The maximum water production for the unit is 7.9 l/day with a power consumption of 1.76 kW-h/l at the volume flow rate of air is 230m3/h. When an evaporative cooler is turned on in the test chamber, the amount of water production increases to about 13.11 l/day with a power consumption of 1.068 kW-h/l, for the same volume flow rate of air mentioned above.
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Mohanad F. Hassan,Abdul Hadi N. Khalifa,Ahmed J. Hamed 대한설비공학회 2021 International Journal Of Air-Conditioning and Refr Vol.29 No.2
Water desalination unit powered by renewable energy sources is sometimes needed at places far from the energy grid lines. Consequently, even countries with rich energy resources, such as the Arabian Gulf countries, have shown strong interest in desalination processes that often use renewable energy sources. This work aims to conduct an exergy analysis of solar-powered humidification–dehumidification (HDH) unit. The exergy analysis input data are extracted from a previous work conducted in August 2020 under Baghdad conditions, 33.3∘N latitude and 44.14∘E longitude. The previous work’s HDH unit consisted of six parabolic trough solar collectors (PTSCs), with a total aperture area of 8.76m2. Meteonorm v7.3 software was used to obtain the weather data for Baghdad City, Iraq. The HDH unit results had revealed low exergy efficiency, where the maximum overall exergy efficiency was 0.305% at 12.00noon, August 17, 2020, when the salty water flow rate was 1 L/min. The unit’s overall exergy efficiencies were 0.09%, 0.16%, 0.31%, and 0.085% when the salty water flow rates were 0.8, 0.9, 1, and 1.2 L/min, respectively. Maximum exergy destructions for the HDH unit components were 0.513, 0.156, 0.332, and 0.304kW for solar radiation, dehumidifier, humidifier, and PTSC, for a salty water flow rate of 1L/min. In contrast, the overall exergy destruction of the HDH unit was 1.3kW.
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Techno-economic assessment of a hybrid connected PV solar system
Falih Hasan,Hamed Ahmed J.,Khalifa Abdul Hadi N. 대한설비공학회 2022 International Journal of Air-Conditioning and Refr Vol.30 No.1
The current work was performed a techno-economic analysis of a 5-kWp capacity hybrid-connected solar system installed on the roof of a house at Diyala province, Iraq (33.77° N, 45.14° E, elevation 44 m). The rooftop PV solar system consists of 18 polycrystalline PV modules of 355 W each, an energy storage system consisting of 8 batteries of 150 Ah, 12 V, and an intelligent inverter of 5-kWp capacity. The PV string output energy and the load sharing between the PV output, the grid, and the discharging energy from the energy storage system are studied. While the economic assessment of the PV system is performed by calculating the net present value (NPV) depending on the discount cash flow method, from the results, the payback time is found. The PV system’s annual results showed that the PV system’s energy yield is 8.9 GWh/year, and the array efficiency, performance ratio, and load efficiency were 0.126, 0.66, and 0.92, respectively. The reference, array, and final yields were 6.1, 3.88, and 3.99 h/day, respectively. The minimum energy feed to the grid was in summer, and the maximum was in winter. On the other hand, the results showed that the maximum purchasing energy was in summer, and the less was in winter. The economic assessment showed that the minimum tariff for Iraq should not be less than 0.1 $/kWh with a PB time equal to PV lifetime; a tariff of 0.12 $/kWh is profitably for Iraq, as the PB time is 10 years.
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