The effect of the distance between the burner and the heat exchanger on the heat transfer characteristics and NOx and CO emission characteristics in a compact combustion system was studied. The premixed burner was installed in front of a heat exchanger, and the distance between the burner and...

An experimental investigation of the performance of a wraparound loop heat pipe (WLHP) charged with R134a is reported in this paper. The copper WLHP has a two-pass evaporator section and a two-pass condenser section, each pass is 330 mm in length with an inner tube diameter of 11.2 mm. The...

A two-dimensional cross-flow tube bank heat exchanger arrangement problem with internal laminar flow is considered in this work. The objective is to optimize the arrangement of tubes and find the most favorable geometries, in order to simultaneously maximize the rate of heat exchange while...

Curved pipes constitute essential components in engineering systems such as heat exchangers, and process pipelines. In curved pipes with 180° bends, the excess pressure drop, and the excess entropy generation (through heat and fluid flow) bring forth serious penalties. To overcome these...

This paper examines the advantages of using the ethanol–water azeotrope as a wickless heat pipe working fluid and the suitability of an inclined condenser structure for a horizontal evaporator operation. Water has, also, been tested as a working fluid for the heat pipe for comparison with the...

This study presents a theoretical and experimental analysis of the thermal performance of a solar water heater prototype with an internal exchanger using thermosiphon system. The results focus mainly on the levels of the heat fluxes temperatures recorded, mass flow rate and efficiency of...

In the present work, we focus on an incomplete combined heat and power (CHP) system. The supplementary thermal performance has been designed to increase the efficiency of the heating system by designing a shell and tube heat exchanger to recover the heat from the exhaust gases. A plate heat...

On the basis of the Number of Transfer Units (NTU) method a functional relation between electric power for fans/pumps and effectiveness in dry coolers and wet cooling towers is developed. Based on this relation, a graphical presentation method of monitoring and simulation data of heat rejection...

We present simulation results on a novel dew-point evaporative air conditioner which was designed based on a counter-flow closed-loop configuration consisting of separated working channels and product channels. The novel evaporative air conditioner is able to cool air to temperature below...

The case of combined conduction–convection–radiation heat transfer usually occurred in solar thermal usages is the aim of the present study. This type of combined heat transfer in heat exchangers filled with a fluid saturated cellular porous medium is investigated. The flow is modeled by the...