In this paper thermo-hydrodynamic characteristics were investigated experimentally for a new type shell-helical coiled tube heat exchanger used as storage tank of closed loop solar water heater system. Triple concentric helical coils made copper tubes (12.5mm OD and 10mm ID) with diameter (207, 152.2, 97mm) outer, middle inner respectively. The experiments carried out during clear sky days (Mar...

The most common type of heat exchanger used in a variety industrial applications is the shell-and-tube (STHE). In this work, impact graphene nanoplate (GNP)/water nanofluids at 0.01 wt.%, 0.03 and 0.06 wt.% on thermal efficiency, performance factor, pressure drop, overall transfer, convective transfer coefficient (CVHTC), characteristics was examined. For these experiments, new STHE designed bu...

The success of quenching process during industrial heat treatment mainly depends on the heat transfer characteristics of the quenching medium. In the case of quenching, the scope for redesigning the system or operational parameters for enhancing the heat transfer is very much limited and the emphasis should be on designing quench media with enhanced heat transfer characteristics. Recent studies...

In this study, the exergy analysis of graphene-based nanofluids in a compact heat exchanger is examined. experiments using distilled water as base fluid, graphene nano-ribbon and oxide were used at 0.01% 0.02% volume concentrations. The carried out 36, 40, 44 oC fluid inlet temperatures 0.6, 0.7, 0.8, 0.9 m3/h mass flow rates. As result calculations made for all temperature rates, it was found ...

A plate-fin heat exchanger is a type of heat exchanger widely used in air conditioners, and tubes and fins are tightly assembled by the mechanical expansion process of tubes. The tube expansion process deforms the grooves inside the tube, and the groove shapes also affect the adhesion between tubes and fins. In this study, the adhesion and heat transfer performance affected by the tube expansio...

Leakage in heat exchanger tubes can result in unreliable products and dangerous situations, which could cause great economic losses. Along with fast development of modern acoustic detection technology, using acoustic signals to detect leakage in heat exchange tube has been gradually accepted and considered with great potential by both industrial and research societies. In order to further advan...

In this paper, the heat transfer enhancement in a counter-flow double pipe exchanger with longitudinal rectangular fins on outer surface of inner tube was numerically investigated by ANSYS 20.R1 software using CFD package and finite volume method. Hot water flows at 60℃ while cold 25℃. The flow is laminar five mass rates from 0.012kg/s to 0.02kg/s) for hot side 0.01kg/s 0.03kg/s side. Two types...

Nanofluids are new generation heat transfer fluids and have opened a new horizon in the areas of heat transfer applications. Nanofluids are prepared by dispersing nano-sized metallic particles in conventional fluids of heat transfer. Heat transfer performance of nanofluid depends primarily on its thermo physical properties like viscosity, thermal conductivity, specific heat and density. Viscosi...

Leakage in heat exchanger tubes can result in unreliable products and dangerous situations, which could cause great economic losses. Along with fast development of modern acoustic detection technology, using acoustic signals to detect leakage in heat exchange tube has been gradually accepted and considered with great potential by both industrial and research societies. In order to further advan...