The storage of surplus heat in the underground and retrieval when required is a promising method for optimizing the energy efficiency of new housing estates. A new approach for the coupled numerical modelling of such problems will be presented. Here, the energy simulation software TRNSYS is directly coupled with the finite element subsurface flow and transport simulation software FEFLOW. This w...

OBJECTIVE To evaluate the possible changes in tidal volume, minute volume and respiratory rate caused by the use of a heat and moisture exchanger in patients receiving pressure support mechanical ventilation and to quantify the variation in pressure support required to compensate for the effect caused by the heat and moisture exchanger. METHODS Patients under invasive mechanical ventilation i...

We describe breakthrough results obtained in a feasibility study of a fundamentally new architecture for air-cooled heat exchangers. In conventional “fan-plus-finned-heat-sink” air-cooled heat exchangers, the primary physical limitation to performance (i.e. achieving low thermal resistance) is the boundary layer of motionless air that adheres to and envelops all surfaces of the heat exchanger. ...

Heat exchanger is an essential device used in complex engineering systems related to heat transfer processes in many industrial applications. Plate Heat Exchanger (PHE) is an important part of a condensing or evaporating system. Among many of factors which should concentrate on, the heat transfer and pressure drop is most important part during sizing and rating the performance of PHE. Due to th...

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...

Ground thermal properties are prerequisites for designing the size of borehole heat exchanger. In this study, a 3D transfer model is developed to simulate response test (TRT) shallow coaxial exchanger (SCBHE), and effects ground on slope mean value inlet outlet fluid temperatures studied. The results show that strongly affected by conductivity slightly capacity, capacity only has small effect s...

A numerical and experimental investigation of flow and heat transfer in a gas- liquid Thermosyphon Heat Exchanger "THE" with built in heat pipes and aluminum plate fins for moderate Reynolds numbers has been carried out. It's module is composed of 6 rows and 15 columns copper pipes with aluminum plate fins with dimensions of 130cm height, 47cm width and  20cm depth. The tubes have been fill...

Air pre-cooling equipment is normally being employed in air-conditioning systems for pre-cooling the ambient outdoor air to enhance the air-conditioning systems performance. In this study, the potential of a passive water-to-air heat pipe based heat exchanger (HPHEX) for air pre-cooling purpose in air-conditioning systems for the high cooling load demanding regions of Iran was investigated. To ...

Analysis of a thermoelectric generator (TEG) in an ocean thermal energy conversion (OTEC) application is presented. An analytic model is developed for describing the heat exchanger-TEG interactions. This model is used to illustrate limitations of applying conventional fixed junction temperature assumptions to systems experiencing significant temperature drops across the heat exchanger surfaces....