The cleaning of heat exchangers, and other large process equipment, using large-scale ultrasonic systems has, in the past few years, progressed from a “curiosity” to a proven, practical tool for many clients. Research and a greater understanding of the physics involved in the cleaning process and the practical considerations of operating in the field have led to improvements in design and usabi...

Nanofluids are a new class of fluids engineered by dispersing nanometer-size structures (particles, fibers, tubes, droplets) in base fluids. The very essence of nanofluids research and development is to enhance fluid macroscopic and megascale properties such as thermal conductivity through manipulating microscopic physics (structures, properties and activities). Therefore, the success of nanofl...

. The development of ~n eddy current testing system is described which encloses a 4-frequency test dev1ce as well as extens1ve computer programs to optimize layout and adaptation to practical problems. Results obtained on the testing of welds and heat exchanger tubes are presented. The testing aim is to detect defects and to determine their type and size.

Ground-coupled heat pump (GCHP) systems have been gaining increasing popularity for space air conditioning in buildings due to their reduced energy and maintenance costs. The efficiency of GCHP systems is inherently higher than that of the traditional options because it utilizes the ground which maintains a relatively stable temperature all the year round as a heat source/sink. Compared with tr...

Thermal management is crucial for the proper functioning of a system whether it in electronics, process industry, automobile, and renewable devices. Micro-channel heat exchanger has proved to be efficient ejection from systems due high transfer surface volume ratio. This study focuses on evaluating cooling performance straight, wavy, dual wavy Micro-Channel Heat Exchanger by modelling model ANS...

The present study aims to experimentally investigate heat transfer performance of rectangular and semicircular tubes in the presence of Ag / water nanofluids. The nanoparticles of Ag (silver) were used in seven different volume concentrations of 0.03%, 0.07%, 0.1%, 0.2%, 0.4%, 1% and 2%. The experiment was conducted in relatively low Reynolds numbers of 301 to 740. A heater with the power of 20...

The three-dimensional tubular heat exchanger has excellent performance in single-phase flow, but its gas solid two-phase flow is still lacking research. In this paper, analysis and comparison of prototypes made up four different tubes by comprehensive evaluation methods are carried out through experimental research theoretical analysis. results show that the ratio long axis to short tube an imp...

in this article the effect of fouling on tube side and the overall performance of preheat exchangers of crude distillation unit of petroleum refinery have been investigated. for this purpose the experimental data of australian light crude oil in surface temperature of 200-260oc and the velocity between 0.25 to 0.4 m/s have been used. first, an overall dirty heat transfer coefficient was calcula...

The use of nanofluids for heat transfer has been examined in recent years as a potential method augmentation different systems. Often, the nanoparticles working fluid does not disrupt system significant ways. As result this general improvement system’s capabilities with relatively few detrimental factors, and hybrid have become an area considerable research interest. One subcategory that under ...

The using of double heat pipe based heat exchanger (HPHX) in a conventional fully fresh air air-conditioning (AC) system was examined in the present study. The fabricated HPHXs were tested under the actual conditions and the measured data were used to study the performance of the existing AC system (System A) and AC system equipped with the double HPHX (System B) for a yearly operation through ...