Heating, Ventilation and Air Conditioning (HVAC) systems are one of the biggest energy consumers around the world. With the efforts of moving to sustainable energy consumption, heat-pump based HVAC systems have gained popularity due to their high efficiency and due to the fact that they are powered by electricity rather than by gas or oil. One drawback of heat-pump systems is that their efficie...

Acquisition of the extracellular tetracycline (TC) resistance plasmid pAST2 affected host gene expression and phenotype in the oil-degrading soil bacterium, Acinetobacter oleivorans DR1. Whole-transcriptome profiling of DR1 cells harboring pAST2 revealed that all the plasmid genes were highly expressed under TC conditions, and the expression levels of many host chromosomal genes were modulated ...

For the problem of low efficiency of conventional valve control systems, an economical PWM-based valve control system with no throttle loss is put forward and examined in this paper. There are four no-throttling-loss units used to control a single rod cylinder in this fixed displacement pump system, which breaks the mechanical linkage of meter-in and meter-out flow in the traditional four way d...

Analytical and experimental studies were carried out on a progressive cavity pump (PCP) fitted with a metallic stator with a fixed, positive clearance around the single helical rotor. This eliminates wear and greatly increases pump life, but it allows leakage or slip back to suction, which decreases the net output flow rate for a given imposed pressure rise. On the other hand, conventional PCPs...

Microfluidic device fabrication: The devices are made in PDMS (polydimethylsiloxane), using the standard soft lithography technique. In brief, we create SU8 (SU8 2015, Microchem) masters on a silicon wafer, then proceed to PDMS (RTV615, Momentive Performance Materials) molding and thermal curing at 80 °C overnight. We treat the PDMS surfaces and the glass slide that closes the channel with oxyg...

The basis of every hydraulic system is based on energy transformations, which are realized through working fluid. Hydraulic oils certainly subject to changes within their structure, meaning the basic characteristics and parameters oil, such as density, viscosity, humidity. that exploited exposed process degradation, largely leads significantly poorer quality paper deals with influence in fluid ...

Condensate transfer is one part of upstream oil and gas production operations. a liquid hydrocarbon obtained from wells. Transfer carried out using pump. In the activity pump, we need to analyze pump parameters. The aim evaluate energy performance according variation velocity fluid being flowed determine pump's working point. research was conducted by testing in field analyzing it CFD solidwork...

Abstract Mechanisms that lead to different quantities of hydrocarbon accumulation in complex fault blocks are a major subject impacts further development plans oil and gas fields. To better understand such mechanisms, activity has been interpreted along with existing electron micrographs from the zone, petrophysical data, occurrence seismic pump. This enabled us investigate controlling mechanis...

By analyzing the type and content of gas in oil, latent faults equipment can be found as soon possible, monitored at any time. In this paper, a degassing device based on headspace method is designed. The oil circuit adopts way pump battery valve to complete inlet discharge. Through stirring, dissolved reach dynamic balance gas-liquid two-phase, so realize rapid effective separation oil. At same...

Hydraulic systems are widely used in industry because of the advantages of their small size-to-power ratios and their ability to produce very large linear force and torque. There are tendencies for compact electro-hydraulic systems which deliver powerful, linear movement having hydraulic oil circulation only when operating. This paper investigates directly driven hydraulic setup for non-road mo...