Showing papers in "Applied Thermal Engineering in 2001"

TL;DR: In this paper, materials for thermal conduction are reviewed, including materials exhibiting high thermal conductivity (such as metals, carbons, ceramics and composites), and thermal interface materials such as polymer-based and silicate-based pastes and solder.

TL;DR: In this paper, the authors presented the results of a numerical and experimental investigation realized on finned tubes with the objective of using them in thermal storage systems, based upon the pure conduction mechanism of heat transfer, the enthalpy formulation approach and the control volume method.

TL;DR: In this paper, an experimental approach for the determination of thermodynamic characteristics of silica gel-water working pair is described, which is essential for the sizing of adsorption chillers.

TL;DR: In this article, the thermodynamic and physical properties of some unconventional fluids for use in organic Rankine-cycles supplied by waste energy sources were investigated using realistic design operating conditions and the energy requirement and recovery system performances were analyzed.

TL;DR: In this article, the authors reviewed the research done in chemical heat pumps regarding to status of technology, current applications and their future prospect, with special reference to their utilization with solar thermal energy for cold production and upgrading/storage of heat.

TL;DR: In this article, a closed-loop pulsating heat pipe (PHP) was analyzed using a charge coupled device (CCD) and the authors observed that during the start-up period, the working fluid oscillates with large amplitude, however, at steady operating state, the fluid circulates.

TL;DR: In this article, a new approach to modelling dynamic processes of vapour-compression liquid refrigeration systems using a dynamic neural network model for the performance prediction has been proposed using a generalised radial basis function neural network as inputs require only those parameters that are easily measurable.

TL;DR: In this article, a hybrid air conditioning system consisting of desiccant dehumidification, evaporative cooling and vapor compression air conditioning has been established, which consists of sections of dehumdification, evaporation and compression.

TL;DR: In this paper, a solar assisted heat pump water heating system, where unglazed, flat plate solar collectors acted as an evaporator for the refrigerant R-134a was designed and fabricated locally, and operated under meteorological conditions of Singapore.

TL;DR: In this article, a phase change energy storage system consisting of sections of different materials with different melting temperatures is proposed for air conditioning applications, where the phase change materials (PCMs) are placed in thin flat containers and air is passed through gaps between them.

TL;DR: In this paper, a computer simulation of a vapour jet refrigeration system is carried out using a one-dimensional model based on mass, momentum and energy balances, which is in good agreement with the available experimental performance from the literature.

TL;DR: In this article, the authors used raised dimples on the inner tube of a coaxial-pipe heat exchanger to increase the heat transfer coefficient and friction factor of the tube.

TL;DR: In this paper, an effective prediction is proposed to estimate the optimal rotation speed and performance of a rotary adsorber, in which simultaneous enthalpy and humidity changes are dealt with separately by visualising changes of state of product or exhaust air on a psychrometric chart.

TL;DR: In this article, a mathematical model for a counterflow wet cooling tower is derived, which is based on one-dimensional heat and mass balance equations using the measured heat transfer coefficient.

TL;DR: In this article, the results of a numerical and experimental study on thermally efficient windows were presented, which indicated large reduction in the infrared and ultraviolet radiations while maintaining good visibility.

TL;DR: In this article, the authors addressed certain issues, which would elucidate the task of pellet/packing design in packed bed-based unit operations, which is very much influenced by the structure of the packing matrix, which in turn is governed by shape, dimensions and the loading of the constituent particles.

TL;DR: In this paper, the authors describe the development of a small-scale system designed to generate electricity from low temperature heat (e.g., solar energy) using n-pentane as the working fluid.

TL;DR: In this paper, the authors describe the development of an ejector refrigeration system that is powered by solar thermal energy, which can provide up to 20 kW of heating to the building during the winter.

TL;DR: In this article, the thermophysical properties (effective thermal conductivity k, permeability K, porosity x and effective specific heat C) of two types of monolithic activated carbons are investigated with the intention of designing a high performance generator for sorption refrigeration systems and heat pumps using ammonia as refrigerant.

TL;DR: In this paper, the results of a detailed study of solid desiccant-based hybrid air-conditioning systems are presented, where the performance of four hybrid cycles (which include a new proposed cycle) for typical hot-dry and hot-humid weather conditions has been evaluated using a detailed procedure for the analysis of rotary dehumidifier, based on the analogy method of Maclaine-Cross and Banks.

TL;DR: In this article, a working prototype of a latent heat storage system for night-time cooling of buildings has been presented, and the design, construction and testing of the prototype is reported, including measurements of heat transfer rates.

TL;DR: In this article, 12 research investigations, carried out by the author and associates during the last 10 years, cover 12 gas turbine systems which would contribute towards efficient use of energy, including closed gas turbine cycle; the organic Rankine cycle; repowering; integrated power and refrigeration; cryogenic power; liquefied natural gas (LNG) gasification; and inlet air cooling.

TL;DR: In this paper, the authors evaluated the suitability of HFC-134a, HC-290, R-407C, R410A, and R-410A for replacing HCFC-22 for air conditioners.

TL;DR: In this paper, an incremental area efficiency methodology was used for the targeting stage of the design and the design was carried out using the network pinch method consisting of both a diagnosis and optimisation stage.

TL;DR: In this article, an experimental and theoretical investigation of air humidification/dehumidification processes carried out in a hollow-fibre membrane contactor is carried out, where the heat and vapour mass transfer between the liquid phase (water and LiCl saturated solution) and the process air is analyzed.

TL;DR: In this paper, the authors examined thermal energy storage (TES) systems for cooling capacity and their applications from the perspectives of energy savings, environmental impact and economics, and highlighted the reduction possible through TES in energy use and environmental pollution levels.

TL;DR: In this paper, a mass recovery process is proposed to improve the performance of an ad-hoc air conditioner and some operation results are summarized. And performance predictions are presented and show that mass recovery can play an important role to better the performance.

TL;DR: In this article, the authors present a review of energy-efficient technologies introduced over the last two decades in the European ceramic industry and analyze the trends for the future and present an assessment of these technologies.

TL;DR: In this article, an electrostatic blower, which is utilized to cool heat-generating bodies, such as typical power-unit chips, was studied, and it was concluded that the heat transfer coefficient can easily be increased by a factor of more than two compared with a natural convection mechanism.

TL;DR: In this paper, phase change materials (PCMs) were integrated with thermosyphons in a thermoelectric refrigeration system to improve the storage capability of the system.