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1. Phi-T map analysis on RCCI engine fueled by methanol and biodiesel

Author:
Wenming, Yang; Meng, Yang
Source:
Energy 2019 v.187
ISSN:
0360-5442
Subject:
specific heat,   etc   ; air; biodiesel; combustion; emissions; latent heat; methanol; mixing; nitrogen oxides; reaction mechanisms; soot;     Show all 11 Subjects
Abstract:
... In this work, a 3-dimensional numerical platform coupled with skeletal chemical reaction mechanism is employed to investigate the impact of various operating conditions on the performance and emissions of a RCCI engine fueled with biodiesel and methanol. Especially, a φ-T map was employed to investigate the methanol percentage on the performance of the engine. The results indicated that the groups ...
DOI:
10.1016/j.energy.2019.115958

2. Air source thermoelectric heat pump for simultaneous cold air delivery and hot water supply: Full modeling and performance evaluation

Author:
Cai, Yang; Zhang, Dong-Dong; Liu, Di; Zhao, Fu-Yun; Wang, Han-Qing
Source:
Renewable energy 2019 v.130 pp. 968-981
ISSN:
0960-1481
Subject:
specific heat,   etc   ; air; air temperature; cold; coolers; energy; heat exchangers; heat pumps; mass flow; mathematical models; renewable energy sources; thermal conductivity; water supply; water temperature;     Show all 14 Subjects
Abstract:
... An air-source thermoelectric heat pump (AS-THP) system is proposed in the present work, and it actively exploits ambient air source energy serving for cold air delivery and hot water supply simultaneously. A mathematical model, combining thermoelectric theory and the effectiveness-number of transfer units (ε-NTU), is firstly conducted to predict the performance of AS-THP system. Subsequently, the ...
DOI:
10.1016/j.renene.2018.07.007

3. Simultaneous determination of soil bulk density and water content: a heat pulse‐based method

Author:
Lu, Y.; Horton, R.; Ren, T.
Source:
European journal of soil science 2018 v.69 no.5 pp. 947-952
ISSN:
1351-0754
Subject:
specific heat,   etc   ; air; energy transfer; equations; heat; models; soil density; soil sampling; soil texture; soil thermal properties; thermal conductivity; water content;     Show all 12 Subjects
Abstract:
... Soil bulk density (ρb) and volumetric water content (θ) determine the volume fractions of soil solids, water and air, and influence mass and energy transfer in soil. It is desirable to monitor ρb and θ concurrently and non‐destructively. We present a heat pulse‐based method for simultaneous determination of ρb and θ from soil thermal properties. The method uses equations that relate ρb and θ to so ...
DOI:
10.1111/ejss.12690

4. Novel thermal management system using mist cooling for lithium-ion battery packs

Author:
Saw, Lip Huat; Poon, Hiew Mun; Thiam, Hui San; Cai, Zuansi; Chong, Wen Tong; Pambudi, Nugroho Agung; King, Yeong Jin
Source:
Applied energy 2018 v.223 pp. 146-158
ISSN:
0306-2619
Subject:
specific heat,   etc   ; air; cooling; electric vehicles; lithium batteries; mass flow; mathematical models; mists; surface temperature;     Show all 9 Subjects
Abstract:
... Thermal management system is crucial for a Lithium-ion battery pack as cycle life, driving range of electric vehicle, usable capacity and safety are heavily dependent on the operating temperature. Optimum operating temperature of Lithium-ion battery pack is about 25–40 °C. Power availability of the battery pack may differ according to the operating temperature. Although air cooling is the simplest ...
DOI:
10.1016/j.apenergy.2018.04.042

5. Modeling of heterogeneous heat transfer in fabrics

Author:
Shen, Hua; Yokoyama, Atsushi; Sukigara, Sachiko
ISSN:
1746-7748
Subject:
specific heat,   etc   ; air; anisotropy; fabrics; heat flow; heat transfer; heat transfer coefficient; models; temperature; textile fibers; thermal conductivity; yarns;     Show all 12 Subjects
Abstract:
... Thermal comfort, an important factor when designing fabric, is strongly related to heat transfer in the fabric. Fabric is not homogeneous because the constituent yarns are interlaced at a certain weave angle, and the contact area between yarns varies. Therefore, heat transfer along the yarn in the fabric is not yet well understood. In this study, we developed a heterogeneous fabric model in which ...
DOI:
10.1177/0040517517698986

6. Thermal Desorption Analysis of Effective Specific Soil Surface Area

Author:
Smagin, A.V.; Bashina, A.S.; Klyueva, V.V.; Kubareva, A.V.
Source:
Eurasian soil science 2017 v.50 no.12 pp. 1428-1434
ISSN:
1064-2293
Subject:
specific heat,   etc   ; adsorption; air; desorption; drying; relative humidity; soil; soil sampling; sorption isotherms; surface area; temperature; volatilization; water potential; water vapor;     Show all 14 Subjects
Abstract:
... A new method of assessing the effective specific surface area based on the successive thermal desorption of water vapor at different temperature stages of sample drying is analyzed in comparison with the conventional static adsorption method using a representative set of soil samples of different genesis and degree of dispersion. The theory of the method uses the fundamental relationship between t ...
DOI:
10.1134/S1064229317120080

7. Thermophysical properties of raw, hot-air and microwave-vacuum dried cranberry fruits (Vaccinium macrocarpon)

Author:
Zielinska, Magdalena; Ropelewska, Ewa; Markowski, Marek
Source:
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2017 v.85 pp. 204-211
ISSN:
0023-6438
Subject:
specific heat,   etc   ; Vaccinium macrocarpon; air; chemical composition; cranberries; drying; fruits; raw fruit; thermal conductivity; thermal diffusivity;     Show all 10 Subjects
Abstract:
... The aim of this study was to compare the thermal properties of cranberry fruits measured with a thermal probe with the values calculated based on the chemical composition of raw, hot air convective dried (HACD, 80 °C) and microwave-vacuum dried (MWVD, microwave power density of 0.75 W g−1, absolute pressure of 4–6 kPa) cranberry fruits. The influence of the drying technique on the thermophysical p ...
DOI:
10.1016/j.lwt.2017.07.016

8. Numerical investigation of a joint approach to thermal energy storage and compressed air energy storage in aquifers

Author:
Guo, Chaobin; Zhang, Keni; Pan, Lehua; Cai, Zuansi; Li, Cai; Li, Yi
Source:
Applied energy 2017 v.203 pp. 948-958
ISSN:
0306-2619
Subject:
specific heat,   etc   ; air; air temperature; aquifers; electricity generation; energy recovery; heat; hydrodynamics; mathematical models; permeability; thermal conductivity;     Show all 11 Subjects
Abstract:
... Different from conventional compressed air energy storage (CAES) systems, the advanced adiabatic compressed air energy storage (AA-CAES) system can store the compression heat which can be used to reheat air during the electricity generation stage. Thus, AA-CAES system can achieve a higher energy storage efficiency. Similar to the AA-CAES system, a compressed air energy storage in aquifers (CAESA) ...
DOI:
10.1016/j.apenergy.2017.06.030

9. Numerical simulation and experimental investigations of air drawing model and air jet flow field model in wide slot positive pressure spunbonding process

Author:
Zhao, Bo
Source:
The journal of the Textile Institute 2017 v.108 no.9 pp. 1590-1599
ISSN:
1754-2340
Subject:
specific heat,   etc   ; air; air temperature; atmospheric pressure; fabrics; mathematical models; melting; particle image velocimetry; polymers;     Show all 9 Subjects
Abstract:
... An air drawing model of polymers and a model of the air jet flow field model in wide slot positive pressure spunbonding process are established. The air jet flow field model is solved by means of the finite difference method. The numerical simulation computation results of distributions of the air velocity match quite well with the experimental data. We find that the variation of the density and t ...
DOI:
10.1080/00405000.2016.1269402

10. How to handle the Hydrogen enriched Natural Gas blends in combustion efficiency measurement procedure of conventional and condensing boilers

Author:
Lo Basso, Gianluigi; Nastasi, Benedetto; Astiaso Garcia, Davide; Cumo, Fabrizio
Source:
Energy 2017 v.123 pp. 615-636
ISSN:
0360-5442
Subject:
specific heat,   etc   ; air; boilers; carbon dioxide; carbon monoxide; certification; combustion; combustion efficiency; computer software; energy; equations; hydrogen; natural gas; normal values; oxygen; relative humidity;     Show all 16 Subjects
Abstract:
... This paper focused on the hydrogen-methane mixtures (H2NG) implications on end-user devices such as boilers, so as to provide a useful tool for maintenance operators. In detail, according to current standards, H2NG blends characteristics parameters for boilers combustion efficiency measurement are calculated. Then, the Ostwald chart for each blend is built by the analytical procedure and is plotte ...
DOI:
10.1016/j.energy.2017.02.042

11. Intense summer heat fluxes in artificial turf harm people and environment

Author:
Jim, C.Y.
Source:
Landscape and urban planning 2017 v.157 pp. 561-576
ISSN:
0169-2046
Subject:
specific heat,   etc   ; air; athletes; athletic fields; convection; cooling; energy; evapotranspiration; heat stress; heat transfer; lawns and turf; solar radiation; summer; temperature; China;     Show all 15 Subjects
Abstract:
... Artificial turf (AT) sports fields have increasingly replaced natural turf (NT). High AT material-cum-air temperature incurs heat-stress impacts on athletes, demanding better understanding of thermal regimes vis-à-vis weather conditions. Adjacent AT and NT sites in humid-tropical Hong Kong were studied. Four radiant-energy components (direct-solar, reflected-solar, sky-thermal, ground-thermal) and ...
DOI:
10.1016/j.landurbplan.2016.09.012

12. Effect of oxygen content on n-heptane auto-ignition characteristics in a HCCI engine

Author:
Wu, Zhijun; Kang, Zhe; Deng, Jun; Hu, Zongjie; Li, Liguang
Source:
Applied energy 2016 v.184 pp. 594-604
ISSN:
0306-2619
Subject:
specific heat,   etc   ; air; combustion; heat; isomerization; kinetics; models; nitrogen; oxidants; oxygen; temperature;     Show all 11 Subjects
Abstract:
... To take maximum advantage of the high efficiency of homogeneous charge compression ignition combustion mode and internal combustion Rankine cycle concept, in this study, the n-heptane auto-ignition characteristics have been investigated using a compression ignition internal combustion Rankine cycle engine test bench and a zero-dimensional thermodynamic model coupled with a detailed kinetic model. ...
DOI:
10.1016/j.apenergy.2016.10.050

13. Theoretical and experimental substantiation of a thermogravimetric method for assessing the water-retention capacity and specific surface area of disperse systems

Author:
Smagin, A. V.; Sadovnikova, N. B.; Bashina, A. S.; Kirichenko, A. V.; Vityazev, V. G.
Source:
Eurasian soil science 2016 v.49 no.12 pp. 1382-1391
ISSN:
1064-2293
Subject:
specific heat,   etc   ; Arenosols; Chernozems; Histosols; air; drying; equations; evaporation; heat; humidity; models; peat soils; sandy soils; sediments; soil colloids; soil water; soil water characteristic; sorption; surface area; temperature; thermogravimetry; vapor pressure; water potential; water vapor; Russia; United Arab Emirates;     Show all 26 Subjects
Abstract:
... A conceptually new instrumental method has been proposed for the determination of the sorption fragment of the soil water retention curve and the specific surface area of soils and sediments by drying samples at different temperatures, which is based on fundamental models for relative air humidity and thermodynamic water potential (Ψ) as functions of temperature (T). The basic equation for the cal ...
DOI:
10.1134/S1064229316100136

14. Comparison of compressed air energy storage process in aquifers and caverns based on the Huntorf CAES plant

Author:
Guo, Chaobin; Pan, Lehua; Zhang, Keni; Oldenburg, Curtis M.; Li, Cai; Li, Yi
Source:
Applied energy 2016 v.181 pp. 342-356
ISSN:
0306-2619
Subject:
specific heat,   etc   ; air; aquifers; energy efficiency; heat; hydrodynamics; mathematical models; permeability; porous media; temperature;     Show all 10 Subjects
Abstract:
... CAESA (compressed air energy storage in aquifers) attracts more and more attention as the increase need of large scale energy storage. The compassion of CAESA and CAESC (compressed air energy storage in caverns) can help on understanding the performance of CAESA, since there is no on running CAESA project. In order to investigate the detail thermodynamic process, integrated wellbore-reservoir (cav ...
DOI:
10.1016/j.apenergy.2016.08.105

15. Numerical investigation of the performance and soil temperature recovery of an EATHE system under intermittent operations

Author:
Mathur, Anuj; Surana, Ankit Kumar; Mathur, Sanjay
Source:
Renewable energy 2016 v.95 pp. 510-521
ISSN:
0960-1481
Subject:
specific heat,   etc   ; air; convection; energy; heat exchangers; mathematical models; renewable energy sources; soil degradation; soil temperature; summer; water content; winter;     Show all 12 Subjects
Abstract:
... One of the problems in operating earth air tunnel heat exchangers (EATHE) for cooling in summer, with soil having high specific heat and low moisture content is accumulation of heat around the pipe. The low rate of heat dissipation due to conduction restricts the performance of EATHE over subsequent years. In the present paper, numerical simulations have been performed to investigate the thermal p ...
DOI:
10.1016/j.renene.2016.04.037

16. Thermophysical properties of laboratory-prepared corn/wheat dried distillers grains and dried distillers solubles dehydrated with superheated steam and hot air

Author:
Zielinska, M.
Source:
Drying technology 2016 v.34 no.10 pp. 1147-1161
ISSN:
1532-2300
Subject:
specific heat,   etc   ; air; bulk density; coproducts; corn; distillers grains; drying; geometry; models; porosity; regression analysis; steam; temperature; thermal conductivity; thermal diffusivity; wheat;     Show all 16 Subjects
Abstract:
... The objective of this study was to dry–wet distillers grains and centrifuged solubles and to examine the effect of two different drying media, superheated steam and hot air, at different drying temperatures (110, 130, and 160°C), moisture contents (5–30% wb), and percentages of solubles’ presence (0 or 100%) on some thermophysical properties of laboratory-prepared corn/wheat dried distillers co-pr ...
DOI:
10.1080/07373937.2015.1099543

17. Solar–terrestrial radiant-energy regimes and temperature anomalies of natural and artificial turfs

Author:
Jim, C.Y.
Source:
Applied energy 2016 v.173 pp. 520-534
ISSN:
0306-2619
Subject:
specific heat,   etc   ; air; athletes; athletic fields; convection; cooling; energy; heat stress; heat transfer; hydrophobicity; irrigation; lawns and turf; light intensity; plastics; polyethylene; rain; solar radiation; summer; surface temperature; thermal radiation; water content; China;     Show all 22 Subjects
Abstract:
... Artificial turf can develop unusually high surface temperature on hot sunny days. Solar and terrestrial radiant energy regimes as key determinants of thermal performance deserve detailed investigation. This study evaluated six components of the radiant-energy environment of a natural turf (NT) and a contiguous artificial turf (AT) sports fields in Hong Kong: direct solar, reflected solar, net sola ...
DOI:
10.1016/j.apenergy.2016.04.072

18. Numerical investigation of natural convection of cavity receiver for low power application

Author:
Ngo, Lloyd Chabala; Bello-Ochende, Tunde; Meyer, Josua
Source:
International journal of green energy 2016 v.13 no.8 pp. 845-851
ISSN:
1543-5083
Subject:
specific heat,   etc   ; air; ambient temperature; convection; energy; heat; solar radiation; thermal conductivity; viscosity; wind;     Show all 10 Subjects
Abstract:
... A parabolic dish/cavity receiver configuration is one of the solar thermal systems used for light-heat conversion at high temperature. Such systems are subject to continuous changes in ambient conditions such as wind, solar insolation, and ambient temperature. These environmental variations, as well as changes in receiver inclination angle, affect the overall receiver performance leading to energy ...
DOI:
10.1080/15435075.2016.1161628

19. Inner Relationship between CO, NO, and Hg in a 6 kWth Circulating Fluidized Bed Combustor under an O2/CO2 Atmosphere

Author:
Wang, Hui; Duan, Yufeng; Li, Ya-ning; Xue, Yuan; Liu, Meng
Source:
Energy & Fuels 2016 v.30 no.5 pp. 4221-4228
ISSN:
1520-5029
Subject:
specific heat,   etc   ; air; carbon dioxide; carbon monoxide; coal; combustion; mercury; nitric oxide; oxygen; temperature;     Show all 10 Subjects
Abstract:
... Combustion experiments of semianthracite coal were conducted on a 6 kWₜₕ oxy-fuel circulating fluidized bed combustor. The inner relationship between CO, NO, and Hg in the combustor under an O₂/CO₂ atmosphere was explored. The results demonstrate that all temperatures are lower under a 21% O₂/79% CO₂ atmosphere than those under an air atmosphere. In oxy-coal combustion, the increasing oxygen conce ...
DOI:
10.1021/acs.energyfuels.6b00119

20. Interface-mediated extremely low thermal conductivity of graphene aerogel

Author:
Xie, Yangsu; Xu, Shen; Xu, Zaoli; Wu, Hongchao; Deng, Cheng; Wang, Xinwei
Source:
Carbon 2016 v.98 pp. 381-390
ISSN:
0008-6223
Subject:
specific heat,   etc   ; air; ambient temperature; graphene; heat tolerance; insulating materials; thermal conductivity; thermal diffusivity;     Show all 8 Subjects
Abstract:
... Due to the ultra-high thermal conductivity (κ) of graphene, graphene-based materials are expected to be good thermal conductors. Here, however, we uncovered extremely low κ of ultralight graphene aerogels (GAs). Although our GA (∼4 mg cm−3) is about two times heavier than air (∼1.2 mg cm−3), the κ (4.7 × 10−3−5.9 × 10−3 W m−1 K−1) at room temperature (RT) is about 80% lower than that of air (0.025 ...
DOI:
10.1016/j.carbon.2015.11.033