Thermal and hydraulic characteristics of TiO2/water nanofluid flow in tubes possessing internal trapezoidal and triangular rib shapes

Alkumait, Aadel A. R.; Ibrahim, Thamir K.; Zaidan, Maki H.; Al-Sammarraie, Ahmed T.

doi:10.1007/s10973-020-10289-7

Cited by 11 publications

(2 citation statements)

References 58 publications

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“…Exergy analysis also helps in locating the irreversibility within a system and assesses the individual system components in terms of their efficiencies [53]. The outcomes of exergy analysis also help process practitioners in refining and developing coal-fired power plants with optimal performance [54][55][56][57][58][59][60][61][62][63][64][65]. The exergy of any thermodynamic process reflects its efficiency or inefficiency and provides a better knowledge of the processes for qualifying energy.…”

Section: Introductionmentioning

confidence: 99%

Parametric Assessment of The Thermal Performance of Coal-Fired Power Plant

Khaleel

Ismail

Ibrahim

2021

ARFMTS

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Exergy analysis has been found to be a useful method for improving the conversion efficiency of energy resources, since it helps to identify locations, types and true magnitudes of wastes and losses. It has also been applied for other purposes, such as distinguishing high- from low-quality energy sources or defining the engineering technological limits in designing more energy-efficient systems. To identify locations, types, and actual magnitudes of energy losses; exergy analysis has been found to be a valuable way for enhancing the conversion efficiency of the different energy systems. The aim of this research is to analyze the effect of the operation conditions on the performance of coal-fired power plants. As well, this study focuses on the effect of different feedwater heaters' numbers that lead to the highest exergy destruction of the coal-fired power plants. For different values of the superheated steam temperature and the pressure, a parametric study was conducted to determine the efficiency of the coal-fired power plant. The results show that, when the pressures and temperature of the superheated steam increases the evaporator temperature will increases too. Increasing the temperature of evaporator rises the average maximum temperature of the cycle, which improves the thermal efficiency of the cycle as well as the powerplant efficiency. The results show that, at higher boiler pressures and temperatures, the temperature difference between the water/steam and hot gases of the boiler is reduced which means the irreversibility associated with the heat transfer process decreases. Therefore, by increasing the pressure and temperature of the superheater, the exergy efficiency of the thermal cycle is improved. It was observed that operating the coal-fired power plant at high superheated pressure and temperatures produce lead to reduce the exergy losses.

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Section: Introductionmentioning

confidence: 99%

Parametric Assessment of The Thermal Performance of Coal-Fired Power Plant

Khaleel

Ismail

Ibrahim

2021

ARFMTS

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“…For residential buildings, air-source heat pumps have a wide range of applications because they can flexibly control the load, meet the needs of cooling, heating, and dehumidification, and meet the needs of individual differences in the human body [1][2][3][4][5]. However, there are still some problems in the application of air-source heat pumps, including low COP of cooling and heating conditions, large air supply temperature difference, and obvious blowing sensation, which affect the thermal comfort of the human body, and the inability to meet indoor requirements [2,[6][7][8][9][10], and the independent control requirements for temperature and humidity [11][12][13][14][15][16]. The study by [17] proposed an air conditioning system coupled with a dehumidification runner and a medium and high-temperature heat pump.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Performance of Heat Pump Waste Heat Regeneration Runner Dehumidification of Air Conditioning Systems

2021

IJOMAM

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This study investigated the performance of a compound unit combining an air source heat pump (ASHP) and a small solid dehumidification runner. In this system, the exhaust gas and the condensation heat of the compressor were used as the regeneration energy of the runner dehumidifier. The detail of the exhaust temperature and the utilization energy characteristics of the heat pump were analyzed; the dehumidification runner under the waste energy utilization of the heat pump was also analyzed. The simulation result showed that the heating performance (COP) of the compound unit was 3.68 at the same evaporation temperature; but when the ASHP supplies heat, the condensing temperature becomes 55.0°C. Also, the primary energy utilization rate of the compound unit was 25 % higher than that of the ASHP. Also, the waste heat of the heat pump system was sufficient to realize the regeneration of the dehumidification runner under the dehumidification and cooling conditions in the hot season and met the prerequisites of the indoor wet load.

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