Showing papers in "Applied Energy in 1991"

TL;DR: In this article, the authors present a review of US applications of nuclear-powered thermoelectric generators in space and a 100kW system is being developed to provide electrical power to a variety of commercial and military projects including SDI.

TL;DR: In this paper, the screening process undertaken to choose the most suitable expansion machine for a steam Rankine-cycle engine, operating principally as a ‘mini’ combined heat and power unit, is described.

TL;DR: The Savonius rotor can develop a relatively high torque at low rotational speeds and is cheap to build, but it harnesses only a small fraction of the wind energy incident upon it as mentioned in this paper.

TL;DR: In this paper, a Wankel expander was selected as the most appropriate device for a steam Rankine engine, operating principally, as a mini combined heat-and-power unit with a mechanical power output of 5-20 kW.

TL;DR: In this article, the effects of energy-saving measures in a production system are analyzed using an aggregate model composed of sub-models that describe unit operations on a technical level of aggregation.

TL;DR: In this article, a computer-aided design technique for selecting the optimal geometry and location of the ports of the expander is described: the computer programs are available from the authors.

TL;DR: In this paper, methods for estimating the change in atmospheric concentration of methane, and for predicting its global-warming effect, are described, and Influences of some of the suggested emission control policies are also discussed.

TL;DR: In this paper, a new model for an air-fluidized solar collector is developed which is based on Trombe wall structure and theoretical and experimental studies on fluidized beds.

TL;DR: In this paper, the authors present a review of both hybrid and active natural-cooling systems for achieving thermal comfort in buildings constructed in hot regions of the world during the last 50 years.

TL;DR: In this article, the authors suggest using an absorption system to cool the intake air to the compressor, which can be powered from the waste heat of the exhaust gases, which attain higher temperatures during the summer.

TL;DR: The evolution of energy education within UK schools and the inherent problems associated with teaching the subject of "energy" to children are reviewed in this paper, where macro-level recommendations are proferred to enhance the quality of energy-education provision within primary and secondary schools.

TL;DR: In this article, a computer code has been employed to evaluate some thermodynamic properties of the most common working fluids for vapor compression plants and to analyze a standard reversed Rankine cycle.

TL;DR: In this paper, a discrete vortex method was applied to the behavior of a Savonius rotor with one bucket shielded, and the flow around and past the rotor was computed for two case studies; namely, rotating and stationary for a number of rotor angular positions.

TL;DR: In this paper, the capacity of an open absorption system with cross-flow absorber was investigated under both adiabatic and non-adiabatic conditions, and the results showed that non-diabatic condition gave a considerable increase in the absorption capacity.

TL;DR: In this paper, the influence of the aspect ratio, pond size, convective-zone thickness, and bottom surface reflectivity on the collection and storage of solar energy is examined analytically, and the relative importance of such factors is illustrated.

TL;DR: A review of experimental work and the algorithms developed is presented, and the requirements for improving existing airflow algorithms are outlined.

TL;DR: In this article, a coiled-pipe exchanger was employed to extract heat rapidly at relatively high temperatures from a 90-litre hot-water charged tank, the water being initially at a temperature of approximately 80°C.

TL;DR: An overview of the electric-power generation and supply industry and its new structure in the UK, as a result of the 1989 Electricity Act, is presented in this paper, where the environmental issues that have arisen in connection with this industry are summarised.

TL;DR: In this paper, experimental analyses of the thermal performances of various heating-element configurations, a low-emissivity internal oven-lining, control systems for regulating internal air temperatures, and various thermal-insulation systems for an oven have been undertaken.

TL;DR: In this paper, the Duhring and enthalpy-concentration charts have been constructed for absorption heat pumps using experimental vapor pressure and heat capacity data, and the enthalpies of solution were calculated using the Haltenberger method.

TL;DR: In this article, a feasibility assessment for the rate of CO 2 emissions from a mini-packaged combined heat and power (CHP) unit serving a high-rise block of 126 flats is presented.

TL;DR: In this article, the interaction between different types of building energy retrofits has been investigated via the OPERA model, which is used for energy retrofit optimization. But the authors also show that the interaction can be neglected, as long as optimal retrofits are introduced.

TL;DR: In this paper, the individual sources of methane are identified and discussed, and available estimates of emission rates from these sources are presented, but the accuracy of available estimates from individual sources is poor; so more field measurements are still required for a more satisfactory evaluation of methane sources.

TL;DR: In this article, a solar air-conditioning system including an absorption heat pump, already in production since the early 1980s, is described for potable water production while performing its airconditioning duty in a solar house.

TL;DR: In this article, a coiled finned-pipe heat exchanger was employed to extract heat rapidly, at temperatures in excess of 30° C, from a 90-litre hot-water charged tank; the water being initially at a temperature of approximately 80° C. Free-convective buoyancy movements of the water around the outside of this coiled pipe (immersed in the store) occur as a result of initially-cold water (at ∼ 20° C) being forced internally through the heat exchange's pipe.

TL;DR: In this article, the authors analyzed the heat transfer and friction properties of laminar forced-convection flows in a parallel-plate channel with an array of fin mounted on the wall.

TL;DR: In this article, the authors compared measurements of airflow rate through a heat-exchanger coil made with a rotating vane-anemometer and a tracer-gas technique and found that the tracer gas technique was simpler to use in practice and has the additional advantages that it does not require detailed specification of the coil or the actual density of air.

TL;DR: In this paper, the authors describe the building and testing of a domestic hot-water system in a laboratory of the Department of Mechanical Engineering, University of Canterbury, New Zealand, which included not only conventional household devices, but also solar panels and a waste-water heat exchanger.

TL;DR: In this paper, the optimal horizontal pitch-to-diameter ratio for cylindrical metal billets should be 1·33 ± 0·05 for a given load of billets.

TL;DR: In this paper, the use of sulphur hexafluoride (SF 6 ), nitrous oxide (N 2 O) or carbon dioxide (CO 2 ) as tracer-gases was examined for the measurement of airflows between two tightly-sealed chambers.