Energy saving in HVAC systems using nanofluid

Firouzfar, Ehsan; Soltanieh, Mohammad; Noie, S.H.; Saidi, Samir

doi:10.1016/j.applthermaleng.2011.01.029

Cited by 71 publications

(22 citation statements)

References 8 publications

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“…The nanofluid in these studies consists mainly of CuO/water [1,2], CuO/ethylene glycol [3], Al 2 O 3 /ethylene glycol [3,4], Al 2 O 3 /water [4][5][6][7][8][9], Al 2 O 3 /ethylene glycol/water [10], TiO 2 /water [8,11], and Ag/methanol nanofluid [12]. Moreover, heat exchangers used in these studies include the microchannel heat sink (MCHS) [1,7,10], miniature-plate heat exchanger [2], plate heat exchangers [3], double-tube flow heat exchanger [3,11], multichannel heat exchanger [5], shell and tube heat exchanger [8], finned tube heat exchanger [9,13], and the thermosyphon heat exchanger [12]. Results of these studies demonstrate that nanofluid could improve the performance of heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Estimation and experimental study of the density and specific heat for alumina nanofluid

Teng

Hung

2012

Journal of Experimental Nanoscience

121

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This study analyses the density and specific heat of alumina (Al 2 O 3 )/water nanofluid to determine the feasibility of relative calculations. The Al 2 O 3 /water nanofluid was produced by the directsynthesis method with cationic chitosan dispersant served as the experimental sample, and was dispersed into three concentrations of 0.5, 1.0 and 1.5 wt.%. This experiment measures the density and specific heat of nanofluid with weight fractions and sample temperatures with a liquid density meter and a differential scanning calorimeter (DSC). To assess the availability of these equations, it then compares the experimental data with the calculated results according to the concepts of mixing theory and statistical mechanism. Comparing the calculated results of density and specific heat with the experimental data, the deviation of density fell within the range of À1.50% to 0.06% and 0.25% to 2.53%, whereas the deviation of specific heat fell within the range of À0.07% to 5.88% and À0.35% to 4.94%, respectively. Calculated results of density and specific heat show a trend of greater deviation with an increased concentration of nanofluid. However, two kinds of density and specific heat of the calculated results fall within an acceptable deviation range in this study.

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Section: Introductionmentioning

confidence: 99%

Estimation and experimental study of the density and specific heat for alumina nanofluid

Teng

Hung

2012

Journal of Experimental Nanoscience

121

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“…El-Baky and Mohamed [8] stated that the incoming fresh air could be cooled down by the application of heat pipe exchanger between two streams of fresh and return air in an air conditioning system. Firouzfar et al [9] established that the application of methanol-silver nanofluid as the working fluid in a two-phase thermosyphon heat exchanger saves energy by 9-31% for cooling and 18-100% for reheating the air supply stream in an air conditioning system. In addition, China Mobile and Tsinghua University [10] developed a system of separated heat pipe, which can save 80% energy compared with air conditioning system.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and economic analysis of gravity heat pipe exchanger applied in communication base station

et al. 2017

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“…Firouzfar et al [16] used silver-methanol nanofluid in thermosyphon heat exchanger to examine the effectiveness of saving energy compared to pure methanol in an air conditioning system. Therefore, methanol based nanofluids can potentially enhance the heat transfer rate of heat exchangers and save energy compared to methanol.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical properties of methanol based Al2O3 nanofluids

Mostafizur

Saidur

Aziz

et al. 2015

International Journal of Heat and Mass Transfer

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a b s t r a c tIn this study, different volume concentrations (0.05, 0.10, 0.15, 0.20 and 0.25 vol%) of cylindrical shaped Al 2 O 3 nanoparticles (50 nm length and 8 nm diameter) were suspended in methanol to produce methanol based nanofluid (MBNF). The nanofluid was prepared by using an ultrasonic homogenizer without any surfactants. Thermal conductivity (k), viscosity (l), density (q) and specific heat (C p ) of the nanofluid were measured for a wide range of temperatures (5, 10, 15, 20 and 25°C). The k values in the range of 0.207-0.234 W/mK, l values in the range of 0.70-0.94 mPas, q values in the range of 791-814 kg/m 3 and C p values in the range of 1.024-1.416 J/g°C were observed as the volume concentration increased from 0.05 to 0.25 vol% with the temperature rising from 5 to 25°C. The results showed that thermal conductivity, viscosity and density increased while specific heat decreased with increase in Al 2 O 3 particle concentration. Besides, thermal conductivity and specific heat increased while viscosity and density decreased with increase in temperature.

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Energy saving in HVAC systems using nanofluid

Cited by 71 publications

References 8 publications

Estimation and experimental study of the density and specific heat for alumina nanofluid

Estimation and experimental study of the density and specific heat for alumina nanofluid

Experimental investigation and economic analysis of gravity heat pipe exchanger applied in communication base station

Thermophysical properties of methanol based Al2O3 nanofluids

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