Showing papers in "Applied Thermal Engineering in 2004"

TL;DR: In this paper, an experimental study was conducted on the cooling of mobile electronic devices, such as personal digital assistants (PDAs) and wearable computers, using a heat storage unit (HSU) filled with the phase change material (PCM) of n-eicosane inside the device.

TL;DR: In this article, the cooling capacity, junction temperature, coefficient of performance, and required heat sink thermal resistance at the TEC hot side were computed for thermoelectric cooler applications in the electronic cooling.

TL;DR: In this paper, the development of microprocessing technology and present a project being carried out to develop combined two-phase heat transfer and heat pipe technology with forced air convection and liquid condenser systems.

TL;DR: In this paper, a regenerative solar desalination unit is modeled and its performance evaluated, and the results of the simulations show that the productivity of the regenerative still is 20% higher compared to the conventional still.

TL;DR: In this paper, a 3 kW cooling capacity steam ejector refrigerator was constructed and the static pressure along the ejector axis at various operating conditions was measured and plotted, and analyzed experimental results introduced three new parameters.

TL;DR: In this paper, a resistor model is presented for easy estimation of effective thermal conductivity (ETC) of highly porous metal foams based on experimental data available, which is based on numerical simulations in which ETC of a random two-phase medium is being comprised of contributions from both the phases.

TL;DR: In this article, the performance of a horizontal ground-source heat pump (GSHP) system used for space heating experimentally is evaluated in a test room with 16.24 m2 floor area in Firat University, Elazig (38.41° N, 39.14° E).

TL;DR: In this paper, a comparison between using two different types of air coolers, namely water spraying system and cooling coil, is performed, and the results show that spray coolers are capable of boosting the power and enhancing the efficiency of the gas turbine power plant in a way that is much cheaper than the cooling coils.

TL;DR: In this paper, an energy and exergy analysis of an open-cycle desiccant cooling system with natural zeolite as the desiccants is presented, and an experimental unit operating in ventilation mode has a coefficient of performance (COP) of 0.35, a reversible COP of 3.11 and an exergy efficiency of 11.1%.

TL;DR: In this article, the effects of inlet temperature, mass flow rate, and heat flux on convection heat transfer in the mini-tube and the porous tube were investigated experimentally.

TL;DR: In this paper, two stainless steel tubes of internal diameter 426 and 201 mm were experimentally investigated using R134a as the working fluid, and it was found that the nucleate boiling is dominant when the vapour quality is less than about 40-50% for the 426 mm tube and 20-30 % for the 201 mm tube.

TL;DR: In this article, an overview of an intake air-cooling system that uses a steam absorption chiller and an air cooler to address the above problem in the Chabahar power plant is presented.

TL;DR: In this paper, the authors compared the performance of three types of domestic air-conditioners, namely the vapour compression airconditioner (VCAC), the absorption air conditioner (AAC) and the thermoelectric air conditioners (TEAC), and showed that although they have the advantages of high COP and low purchase price, use of these systems will be phased out due to their contribution to the greenhouse effect and depletion of the ozone layer.

TL;DR: In this paper, a computer code based on existing one-dimensional ejector theory is written to analyze performance of the ejector, which includes effects of friction at the constant-area mixing chamber and change in specific heat of the working fluid besides internal irreversibility of ejector.

TL;DR: In this paper, the relative merits of using polymers over metals are shown through a quantitative comparison, between PVDF and Hastelloy heat exchangers, when incorporating the same tube dimensions, thickness and fluid film coefficients, significant cost savings can be achieved using the PVDF exchanger.

TL;DR: In this article, a large cooling system of residential building in Changsha City in China was investigated in the summer of 2003, and the relationships among the controlled variables, uncontrolled variables and the chillers' performance were obtained empirically with the test data.

TL;DR: In this paper, the energy and exergy losses forming in the heat distribution network of district heating systems were evaluated for the purpose of identifying equations of exergy and energy losses and by using them, heat distribution networks of the university campus which has a heating network of pipes 11,988 m in length and 65-250 mm in diameter was analyzed.

TL;DR: The AFTUR project as mentioned in this paper aims to extend this capability to a wider range of potentially commercial fuel types, including those of lower calorific value produced by gasification of biomass (LHV).

TL;DR: In this paper, the authors presented an analysis of energy and exergy utilization in the transportation sector of Saudi Arabia by considering the sectoral energy and energy flows for the years of 1990-2001.

TL;DR: In this article, the authors investigated the environmental impact of heat insulation used for reducing heat losses in building and determined that CO2 emissions amount decreased 50% by means of optimum insulation thickness used and other energy savings methods in buildings.

TL;DR: In this article, a phase change material (PCM) was used to store the rejected heat from air conditioning systems, which can be used to generate low-temperature hot water.

TL;DR: In this paper, the optimal thickness of insulation for some insulating materials used in order to reduce the rate of heat flow to the buildings in hot countries has been determined for a typical house in Qatar which is an example of hot area.

TL;DR: In this paper, the effects of the turbulators on the heat transfer, friction factor and performance characteristics were investigated, and it was observed that as the pitch increases, the vortex shedding frequencies decrease and the maximum amplitudes of pressure fluctuation of vortices produced by coiled wire turbulators occur with small pitches.

TL;DR: In this paper, the authors investigated the general optimum speed variation for off-design efficiency with an analytical approach proposed by the last two authors, and they showed that the optimum part-load performance is basically not influenced by the design temperature ratio and pressure ratio.

TL;DR: In this paper, a desiccant wheel integrated air-conditioner is studied for low humidity air conditioning, which dehumidifies and heats the supply air to maintain indoor air quality.

TL;DR: In this paper, a thermal stratification model with minimum mixing between hot and cold water is proposed for the evaluation of the performance of storage system by the assumption of the uniform plug-type flow.

TL;DR: In this paper, a technique for modeling proton exchange membrane (PEM) fuel cell stack thermal systems is presented to determine the fundamental thermal-physical behavior of the thermal systems, and to investigate the system parameters.

TL;DR: In this paper, the authors investigated latent heat storage by materials with phase change temperatures in the above range, and focused on a mixture of magnesium nitrate hexahydrate as a base material and magnesium chloride hexahedrate as an additive to modulate the melting point.

TL;DR: In this article, a simulation model was used to quantify design tradeoffs associated with refrigerant maldistribution caused by header pressure gradients in microchannel evaporators, and a fundamentally different concept for header design was identified and characterized, based on parametric analyses.