Steady-state rates of heat transfer to a cold horizontal pipeline within an atmospheric pressure, air-filled, horizontal rectangular cavity with relatively hot isothermal walls, have been determined experikentally. The optimal geometrical arrangement, i.e. that for which the least rate of heat...

Combined heat and power (CHP) generation is not a new concept, but it provides an elegant solution to some of our present fuel problems, offering, as it does, 80% or greater efficiency. However, Great Britain lags behind other European countries with respect to the rate of introduction of CHP...

Experimental measurements and theoretical predictions of steady-state heat transfers to or from horizontal single or double pipelines enclosed in horizontal circular or rectangular enclosures have been collated. The optimal configurations of the pipelines to achieve maximum thermal resistances...

The behaviour of a double-pipe arrangement, consisting of a hot supply pipe and a warm return pipe enclosed within a relatively cold, rectangular, air-filled trench was considered. The minimum rates of steady-state heat losses occurred with the supply and the return pipes at displacement ratios...

The optimal configuration, i.e. that which achieves the minimum steady-state rate of heat gain by the (colder) supply pipe for the considered conditions, has been determined experimentally. By using the displacement ratios of the two pipes as the experimental variables, the optimal configuration...

Factors influencing the heat loss behaviours of horizontal [`]supply' and [`]return' hot-water pipes, within a rectangular trench, are considered (see Fig. 1). The use of such atmospheric-pressure air channels for district-heating systems is prevalent in the UK in order to facilitate drainage...

Visualisation of the air flows in the gaps between horizontal cylindrical pipes surrounding relatively cooler pipes has been undertaken, and the corresponding steady-state heat losses measured. Consequently, preliminary recommendations concerning how to improve the thermal insulation...

An experimental investigation into the effect of the displacement ratio of a heated horizontal pipeline within an atmospheric pressure air-filled, relatively cold, horizontal rectangular cavity was made. The optimal position of the pipeline to achieve maximum energy thrift occurred at a...

Flow patterns, temperature distributions and steady-state heat transfers inwards across a horizontal annular, atmospheric-pressure, air-filled eccentric cavity have been determined. Several different configurations of two low-conductivity baffles (arranged symmetrically with respect to the...

The widespread implementation of combined heat-and-power (CHP) is especially desirable for Hungary, which is a country poor in fossil-fuel resources yet facing a rising energy demand in the wake of recent political and economic upheavals. However, predicting the economics of prospective CHP...