Showing papers in "Journal of Heat Recovery Systems in 1981"

TL;DR: In this article, a simple mathematical model is developed to predict the performance of a two-phase closed thermosyphon, where water, ethanol and Freon 113 are used as the working fluids.

TL;DR: In this article, the entrainment or flooding limit of a copper-water thermosyphon was investigated in more detail, and the experimental results have been assessed and compared with existing theories.

TL;DR: Gas-gas heat recovery systems are probably the most prolific in all application areas, and are certainly of considerable interest for rapid "retrofitting" on industrial plant as an energy saving measure as discussed by the authors.

TL;DR: In this article, an experimental investigation was performed in order to observe the effect of the inclination angle on the transport behavior of a closed two-phase thermosyphon, where a vertical or inclined steel pipe was used; this was electrically heated at the lower part (heating zone) and it was cooled by water at constant temperature along the upper part (cooling zone).

TL;DR: In this paper, a self-driven chemical heat pipe is provided in a circuit including an endothermic reaction chamber and an exothermic chamber connected by a pair of arms extending therebetween.

TL;DR: The process of ceramics firing, as well as many other high temperature processes, is highly inefficient and it is possible to recover an important fraction of the heat input as mentioned in this paper.

TL;DR: In this article, the authors reviewed the following schemes to achieve liquid pumping over critical distances: (a) Mechanical pumping using external power, (b) buoyancy bubble pumping, (c) bubble injection, (d) electrohydrodynamic pumping, cascaded heat pipe, (e) mechanical pumping using internal power, rotating wheel, oscillating pressure driven pumping, and (i) osmotic heat pipe.

TL;DR: In this paper, the effect of centrifugal force on the performance of a rotating heat pipe has been investigated, and it is found that the internal structure of the heat pipe remarkably affects the performance characteristics of rotating heat pipes, and that adequate internal structure makes it possible to take advantage of increasing maximum heat transport capability by revolution without decrease of the apparent internal heat transfer coefficient.

TL;DR: In this paper, an experimental study of a heat pipe to be used as a component in an air-to-air heat recovery heat exchanger is described, where the two fluids used are water and refrigerant 22, over a temperature range of 20-100°C.

TL;DR: In this paper, the performance limitation of screen-wick heat pipes has been determined as a function of various heat pipe parameters, and a correlation could be derived allowing to predict the maximum performance.

TL;DR: The use of the heat pipe as a component in a heat recovery device has gained worldwide acceptance; over one million gravity-assisted heat pipes are now installed in commercial and industrial heat recovery applications as discussed by the authors.

TL;DR: In this article, an improved heat exchanger finned tube and a method and apparatus for producing elongated segments of the finned tubes comprising knurling the outside surface of a central tube of heat conductive material, forming strip stock material into a continuous fin and spirally winding the fin about the outer knurled surface of the central tube.

TL;DR: In this paper, a system for recovery and recycling of a washing liquid and heat contained in the washings discharged from a metal surface treatment process comprises a hot water washing tank with an associated cushion tank, a cold-water washing tank and an associated ion exchanger.

TL;DR: In this article, the compatibility of water and mild steel as the working fluid and vessel material in a heat pipe application was evaluated and it was concluded that mild steel heat pipes had a lower overall thermal resistance than the stainless steel pipes, and that performance recovery occurs at a greater rate in the mild steel pipes when noncondensible gas is generated.

TL;DR: In this article, a study of viscosity, density and surface tension of a sulfur-iodine binary system in the temperature range 300-700°C in the saturation line has been carried out.

TL;DR: In this paper, air and particle flow and heat transfer tests for steel and alumina particles were carried out on the Falling Cloud Heat Exchanger rig at the University of Aston in Birmingham.

TL;DR: The authors derives a corresponding function for the greatest possible utility of heat in producing heating and suggests that it be named thermergy, as an analogue of exergy, and discusses some aspects of its use.

TL;DR: In this paper, a specially designed and instrumented heat pump is described and its performance, using R22 as the working fluid has been evaluated, and an equation is also presented which correlates the actual coefficient of performance against temperature lift.

TL;DR: In this paper, the theoretical Rankine coefficients of performance (COP) R and the compression ratios have been presented for heat pump systems operating on R22, for temperature lifts of 10−75°C in 5°C increments and condensing temperatures T CO for every degree in the range of 15−85°C.

TL;DR: The success of a heat recovery installation depends as much on the integration of the heat recovery unit with the system to which it is being applied, as on the heat exchanger itself as discussed by the authors.

TL;DR: In this article, the main concern of heat recovery from the processing in the iron melting industry is discussed. But the main focus of this paper is on the heat recovery of the process.

TL;DR: In this article, the authors derived the theoretical Rankine coefficient of performance (COP) R and the compression ratio P CO /P EV for R11 for temperature lifts in 5°C increments and condensing temperatures T CO for every degree in the range 15-175°C.

TL;DR: In this paper, a table of derived thermodynamic data for water, Refrigerant 718, is presented in a form suitable for calculations based on the use of water as the working fluid of a heat pump.

TL;DR: In this paper, the most important results in the framework of developing and testing gravity-type heat pipes in a large-space stable are reported, which involve the optimum volume of the heat-transfer medium (ammonia), the course of efficiency in dependence on the temperature differential between exhaust air and outside air, and the annual quantity of recovered heat.