Showing papers in "Energy Conversion and Management in 1984"

TL;DR: In this article, a cost analysis of three types of solar energy systems, viz., solar dryers, solar water heating systems and solar distillation units, has been described and a uniform cost analysis procedure has been adopted.

TL;DR: In this article, the authors examined the correlations between monthly-average daily values of diffuse and total insolation and between hourly and daily insolation, and found that the relationship between monthly diffuse/total and total/extraterrestrial ratios is linear.

TL;DR: In this paper, a double condensing, multiple wick solar still has been proposed to increase the area of the condensing surface by introducing an additional G.I. sheet just below the blackened wet jute cloth with a slight spacing around the absorbing surface.

TL;DR: In this paper, a review of salt-gradient solar ponds and their applications is presented, along with the basic thermophysical processes and considering the three zone configuration of a solar pond.

TL;DR: In this paper, a correlation between hourly diffuse ratio and clearness index for New Delhi was developed on the basis of measured data for two years and the performance of this correlation was checked by calculating the difference between computed and measured diffuse radiation.

TL;DR: In this article, a detailed mathematical model of vapor compression heat pumps is described, which predicts the spatial values of temperature and enthalpy as functions of time for the two heat exchangers.

TL;DR: A solar distillation plant of capacity 70 litres/day (annual average) has been installed at the Centre of Energy Studies, Indian Institute of Technology, New Delhi, India as mentioned in this paper.

TL;DR: The current status of materials research for high-temperature thermoelectric energy conversion is reviewed in this paper, where two general classes of materials show promise for high temperature figure of merit (Z) values, viz, the rare-earth chalcogenides and the boron-rich borides.

TL;DR: In this paper, the authors examined the high-temperature thermoelectric energy-conversion theory and showed that semiconductors are the logical choices for high-figure of merit-value materials, but the requirements for optimization differ depending on whether the material is classed as a broadband or narrowband semiconductor.

TL;DR: In this article, the authors used daily global and diffuse radiation data for 13 stations in India to establish a correlation between the daily diffuse ratio and the clearness index, and found that a cubic equation provides a fairly accurate fit for this relationship.

TL;DR: In this article, a new electrolyte has been proposed for the deposition of nickel-black selective coatings for use in flat-plate solar collectors, which exhibits better corrsion resistance than the well known black-nickel coatings (which contains nickel, zinc and sulphur) apart from having thermal stability upto 380°C.

TL;DR: In this paper, the effect of the dimensions of rectangular ducts through which air flows in solar air heaters on the air heater performance has been studied for laminar, transitional and turbulent flows.

TL;DR: In this paper, a cylindrical collector-cum-storage type solar water heater has been designed, developed and tested and its year round performance has been carried out and reported in this paper.

TL;DR: In this paper, an analytical model to study the performance of a two-channel suspended flat plate air heater is presented, where the effect of different parameters, e.g. spacing between the plates, plate length, same and different flow rates of air in the two channels of the air heater, on the air temperature has been studied.

TL;DR: In this paper, solar distillation tests were performed with samples of muddy water in a deep basin type solar still and the results showed that, on a 24-hour basis, the distillate output is independent of the muddiness of the water sample.

TL;DR: In this paper, an experimental investigation has been carried out on a thermosyphon solar water heater for domestic hot water supply in Basrah, Iraq (latitude 30.76°N).

TL;DR: In this paper, it was shown that this oxide coating may be stabilized by an annealing of the slowly air-oxidized and Ni(OH)2-coated catalyst in hydrogen at 350°C, followed by an airoxidation again.

TL;DR: In this article, the momentum theory is applied to wind energy concentrator systems and the concentration of the mass flow through the turbine and the augmentation of the specific energy drop over the turbine are taken into account.

TL;DR: In this paper, a dimensionless analysis of matrix air heaters has been developed to study the effect of different boundary conditions on its performance, and the theoretical results have been compared with measurements of an experiment performed with one type of matrix solar air heater.

TL;DR: In this paper, a periodic thermal model for an evaporative cooling system over the roof has been presented, where the time dependency of solar radiation, ambient air, sol-air and room air temperatures has explicitly been taken into account by expressing as a Fourier series of time for a 24-hour cycle.

TL;DR: In this paper, the authors propose and analyze an air-heating system which differs from conventional systems in the sense that it stores a substantial amount of heat and hence can be used in the night hours also.

TL;DR: In this paper, a mathematical model has been developed to predict the performance of a shallow solar pond water heater with a heat exchanger, by properly taking into account the absorption of solar radiation in the body of pond water.

TL;DR: In this article, a three-zone solar pond with a diffusely reflecting bottom was investigated and the dynamic performance and its optimization as a large scale solar energy collection and long term storage system were discussed.

TL;DR: In this paper, an experimental investigation is carried out on a forced circulation solar water heater to assess its performance under various operating conditions, which consisted of two identical collectors of total absorber area of 3.45 m 2 and a storage tank of 200 litre capacity.

TL;DR: In this paper, a quantitative estimate of the reduction in lattice thermal conductivity of lead telluride type material as a function of doping level, grain size, alloying and temperature was made.

TL;DR: In this paper, the authors derived the thermodynamic optimum for reversible and irreversible heat pumps for transfer heat from a low temperature heat source stream to a high temperature heat sink stream and the manner of use and operation of a number of heat pumps in such a system.

TL;DR: In this article, the relative merits of a thermosyphon heater for domestic water heating are brought to light with special emphasis to Libyan weather conditions, and the experimental performance of this type of heater was studied by the authors for a brief period and reported in an earlier study.

TL;DR: In this article, a simple solar collector cum crop drying system is described and analyzed analytically and experimentally in terms of drying ratio, rehydration ratio, culinary and organoleptic characteristics of Methi and Bhendi crops.

TL;DR: In this article, generalized K T -curves were developed for the Indian region and used in deriving a monthly average correlation between diffuse ratio (D/H ) and (K T ).

TL;DR: The MHD disk generator has been used as an experimental tool to study plasma properties and to explore new diagnostic techniques, since it provides a near-ideal geometry for plasma studies due to its electrodeless configuration combined with near-perfect insulating walls.