Showing papers in "Applied Thermal Engineering in 2013"

TL;DR: In this paper, a review of the history of internal combustion engine exhaust waste heat recovery focusing on organic Rankine cycles is presented, with a focus on the selection of the cycle expander and working fluid, since they are regarded as having the largest impact on system performance.

TL;DR: In this article, heat transfer enhancement technique by using internal and external fins for PCM melting in a triplex tube heat exchanger (TTHX) was investigated numerically.

TL;DR: In this article, the authors analyzed heat pumps with radiators or underfloor heating distribution systems coupled with thermal energy storage (TES) with a view to showing how a heat pump system behaves and how it influences the building occupants' thermal comfort under a DSM strategy designed to flatten the shape of the electricity load curve by switching off the heat pump during peak hours.

TL;DR: In this paper, the authors compared the flexibility and efficiency of different types of thermal gasification of biomass and showed that they can be both highly flexible and efficient if used optimally.

TL;DR: In this paper, an overview of original and literature data on several classes of materials potentially promising for this important application, namely, metalaluminophosphates (AlPOs, SAPOs, MeAPOs), metal-organic frameworks (MIL, ISE), ordered porous solids (MCM, SBA, etc.), porous carbons and various composites (SWSs, AlPO-Al foil).

TL;DR: In this article, the authors provide an extensive overview of convective heat transfer coefficients for external building surfaces (hc,ext) implemented in building energy simulation (BES) programs together with the corresponding assumptions.

TL;DR: In this paper, the shape stability and thermal conductivity of composite phase change material (PCM) with GPNs were investigated for thermal energy storage applications, where the maximum mass percentage of PA absorbed by GNPs was 91.94% without leakage of PA in molten state as proven by dropping point test.

TL;DR: In this paper, the authors present a review of technologies suitable for utilisation of waste heat energy, with specific focus on low grade heat, including: (i) chemical heat pumps, such as adsorption and absorption cycles for cooling and heating; (ii) thermodynamic cycles such as the organic Rankine cycle (ORC), the supercritical Rankine Cycle (SRC), and the trilateral cycle (TLC), with further focus on expander and zeotropic mixtures, and (iii) thermal energy storage, including sensible and latent thermal energy storages and

TL;DR: In this paper, an experimental investigation carried out to characterize the thermal performance of different configurations of phase change material (PCM) based pin fin heat sinks was carried out and the results showed that there exists sufficient scope to optimize the thermal design of the heat sink.

TL;DR: In this paper, a regenerative organic Rankine cycle (ORC) was used to utilize the solar energy over a low temperature range and a thermal storage system was employed to store the collected solar energy and provide continuous power output when solar radiation is insufficient.

TL;DR: The Saudi Cultural Bureau in London, the Ministry of Higher Education and the Mechanical Engineering Department, Umm Al-Qura University as discussed by the authors have published a survey on the Saudi cultural heritage.

TL;DR: In this article, the heat transfer performance of the automobile radiator is evaluated experimentally by calculating the overall heat transfer coefficient (U ) according to the conventional ǫ-NTU technique.

TL;DR: In this article, a geothermal regenerative organic Rankine cycle based on both energy and exergy concepts is presented, where the authors investigate the effect of operating parameters and their effects on the system energetic and exergetic efficiencies and economic parameters.

TL;DR: In this paper, the authors explored the forced convective heat transfer performance of using Al2O3/water nanofluid to replace the pure water as the coolant in a copper minichannel heat sink.

TL;DR: In this article, the effect of fluid flow and geometrical parameters on heat transfer rate in shell and coiled tube heat exchangers has been investigated experimentally using Wilson plots.

TL;DR: An extensive review of computational fluid dynamic (CFD) modeling to study combustion and gasification in fluidized beds has been done in this article, where mathematical equations governing the fluid flow, heat and mass transfer and chemical reactions are described and main CFD models are presented.

TL;DR: In this paper, a phase change composites (PCC) using graphite and nickel particles as highly thermal conductive fillers was developed and its effective thermal conductivities became two orders of magnitude larger than that of the original PCM.

TL;DR: In this paper, the first and second law of thermodynamic properties of two different technologies (ORC and Kalina cycle) for power production through an enhanced geothermal system (EGS) were analyzed.

TL;DR: A review of the literature on TIM reliability can be found in this paper, where a test procedure is proposed for TIM selection based on the information available in the open literature, based on beginning and end of life performance.

TL;DR: In this paper, the authors studied the thermodynamic aspects of PTES, including energy and power density, and the various sources of irreversibility and their impact on round-trip efficiency.

TL;DR: In this paper, a three-dimensional numerical model of the interrupted microchannel heat sink is presented to study the effects of pressure drop and heat transfer characteristics due to various dimensions and positions of rectangular ribs in the transverse microchambers.

TL;DR: In this article, a generic energy systems engineering framework is proposed for the optimal design of DES in China, with the purpose of obtaining optimal combination of technologies and capacity of equipment for a given area with given energy demands.

TL;DR: In this paper, the effect of ethanol on combustion and emissions in premixed low temperature combustion (LTC) was investigated in a four cylinders heavy-duty diesel engine, where the biodiesel was used as an additive to prevent the stratification of ethanol and diesel blends.

TL;DR: In this paper, a two-phase flow ejector model was used to determine the internal ejector component efficiencies using measured performance data external to the ejector in conjunction with the model.

TL;DR: In this article, a detailed numerical simulation tool was used to conduct the analysis of the helical and triple U-tube configurations inside a foundation pile, where the problem of heat transfer was solved by means of an equivalent electrical circuit of suitable thermal resistances and capacitances.

TL;DR: In this paper, an analysis is made of the efficiency of storing liquefied air in a Rankine cycle and a more complex combined cycle is studied, and it is shown that the ideal cycles have a high efficiency.

TL;DR: In this paper, the influence of external solar shading devices on the energy requirements of a typical air-conditioned office building for Italian climates was analyzed for the entire year by using a building energy simulation code.

TL;DR: In this paper, the effect of tunnel slope on the fire induced hot gas temperature profile beneath the ceiling has not been clarified nor included in existing models and experiments are carried out in a reduced scale model tunnel with dimensions of 6m (length) − 1.3m (width) − 0.8m (height).

TL;DR: In this article, a new correlation was developed for laminar flow in helically coiled tubes, which can predict the experimental heat transfer data very well, and the Seban and McLaughlin correlation can accurately predict the thermal behavior of water and nanofluids when nanof-luid properties are taken into account.

TL;DR: A review of the best available technologies for recovery of waste heat is provided, ranging from heat transfer between source and sink, to novel technologies for the generation of electricity and refrigeration.