Showing papers in "Applied Thermal Engineering in 1996"

TL;DR: In this article, a unique profile for the reflecting surfaces has been developed such that the solar cells are evenly illuminated under any degree of concentration, and a prototype of an east-west trough solar concentrator using the profile developed for reflecting surface, and incorporating a thermosyphon cooling system for the photovoltaic cells, was manufactured and successfully tested.

TL;DR: In this paper, the authors present a review of the application of variable-speed capacity control to refrigeration systems and present a diversified information in a single source and to appraise recent advances in variable speed technology.

TL;DR: In this paper, a real thermoelectric power generator utilizing waste heat is proposed, where the generator is treated as an external and internal irreversible heat engine and the specific power output is analyzed and compared with that of the Carnot, endoreversible and external reversible heat engines.

TL;DR: In this article, a kinetic study of the hydration of magnesium oxide was performed to test the possibility of developing a magnesium oxide/water chemical heat pump, and an empirical rate equation based on this hypothesis was proposed with parameters determined from experimentally measured values.

TL;DR: In this paper, an adorption system with the temperature wave heat generation is numerically analyzed, using a two-dimensional model which takes into account both heat and mass transfer processes inside the adsorber.

TL;DR: In this article, a preliminary survey on the ambient compatibility and thermophysical capability of the novel or unconventional fluids is investigated in tests using equipment annexed to a supersonic wind tunnel operating on the blowdown principle.

TL;DR: In this paper, the impact of heat of adsorption on gas performance during discharge was evaluated with commercially available ANG cylinders under realistic conditions, and the results showed that the performance loss was as high as a 37°C temperature drop at high discharge rate with a performance loss approaching 25% of isothermal capacity.

TL;DR: In this paper, an energy-efficient system is proposed to reduce energy consumption in air-conditioning (A C ) systems using CaCl2 solution as a liquid desiccant, which consists mainly of two packed beds, a heat pump, air washers and a cooling coil.

TL;DR: In this article, the authors applied computational fluid dynamics to the prediction of ejector performance for heat pumps and found that the performance of an ejector varies with types of refrigerant used.

TL;DR: In this paper, the results of fitting to the Dubinin equation and modelling of cycles based on these pairs are presented, and a range of alternatives, including R32 and butane, as refrigerants and new monolithic carbon adsorbents are presented.

TL;DR: In this paper, an inlet air precooler connected to the evaporator of an aqua ammonia absorption chiller is used to partially recover the exhaust heat before entering the generator of the chiller.

TL;DR: In this article, a two-bed solid-sorption refrigeration system using activated carbon/ammonia sorbent/sorbate pair was evaluated using the ANSI Standard Z21.40.

TL;DR: In this paper, the role of recuperators and regenerators in future gas turbines is put into perspective, and it is shown that these will essentially necessitate the utilization of ceramic-composite heat-exchanger configurations that are amenable to large-volume manufacturing methods.

TL;DR: In this article, the authors compared the thermal vapour-compression process with the predominant multi-stage flash (MSF) desalting system and showed that the conventional multi-effect (ME) system can produce desalted water at a lower cost than the MSF system when both are supplied with steam after its expansion in steam turbines.

TL;DR: In this article, a double-pipe adorber was used to simulate real refrigeration cycles, where the heat transfer fluid flows in one direction during hot front (heating period), and in the other direction during cold front (cooling period).

TL;DR: In this article, a novel storage unit of multiple phase change materials (PCMs) is developed, which consists of a tube which is surrounded by an external coaxial cylinder made up of several segments of different PCMs with different melting points.

TL;DR: In this article, the performance of phase-change, thermal energy storage units from the second-law viewpoint is evaluated for a complete charging-discharging cycle of a system consisting of two storage units.

TL;DR: In this article, a sophisticated equation-based model, consisting of the conservation equations (energy, mass, momentum) and engineering design relations, is presented to model the dry cooling systems performance for power plant applications.

TL;DR: In this article, the authors studied the drying characteristics of coriander in a stationary 0.5 tonne/batch capacity deep-bed dryer coupled with a solar air heater and a rockbed storage unit to receive hot air during sunshine and off-sunshine hours, respectively.

TL;DR: This paper aims at extending the number of factors considered in pinch analysis towards a life-cycle optimisation and proposes new synthesis representation schemes and results in an improved and more coherent exergy balance for comparing energy recovery schemes.

TL;DR: In this article, the authors present a review of methods to estimate the properties of oil-refrigerant solutions required in the design of RRCMs, and in some cases propose more efficient ones.

TL;DR: In this article, a generator-absorber heat exchange (GAX) heat pump was modeled using OSU-ABSIM, a modular steady-state simulation program, and the effect of ambient temperature on system COP was determined for the cooling and heating modes.

TL;DR: In this article, a steam power plant thermodynamic model developed using the ASPEN Plus shell is presented, validated using field data from two units, one with a capacity of 105 MWe and the other 150 MWe.

TL;DR: In this article, the effect of inlet flow distortions on fan performance in forced-draught air-cooled heat exchangers (ACHEs) is investigated numerically and experimentally.

TL;DR: In this article, the two-phase heat transfer coefficient and pressure drop characteristics of refrigerant R22 and R407C (a mixture of R32/R125/R134a, 23%/25%/52%) in a micro-fin tube with nominal diameter 9.52 mm were taken at an evaporation pressure of 600 kPa.

TL;DR: In this article, the Miropolskiy's slip ratio combined with Lin's frictional pressure-gradient correlations was used to predict the slip ratio in the flow within the capillary tube.

TL;DR: In this paper, a simulation model able to represent the gas-solid bed behavior for different operating parameters and design choices has been presented, with reference to the air-cooled bed of a sintering plant for blast furnace feeding.

TL;DR: In this paper, the convective thermal wave adsorption cycle is described and a thermodynamic model which takes account of the variations in temperature and concentration in the bed is proposed, and the results of using the model with a particular carbon adsorbent and ammonia adsorbate are presented for a range of cycle temperatures and system heat transfer effectiveness values.

TL;DR: An improved lumped parameter model has been developed to predict the dynamic performance of adsorption cycles with a single and/or double adsorber with heat recovery in this article, which is based on the conservation equations and the isosteric equation of state.

TL;DR: In this paper, an empirical correlation to predict pressure drop in beds of cylindrical particles has been developed, and comparisons have been made with particles, such as hollow cylinders, and hollow cylinders have been examined.