In this experimental work, the investigation about impact of geometrical dispositions triangular obstacles on performance parameters such as pressure drop and thermal efficiency. A number input affects system. These are heat flux, mass flow rate ( = 0.01 to 0.02 kg/s), obstacles’ height, h from 22 mm 37.5 mm, their cross-stream wise pitch (Ly 56 206 mm), angle inclination with vertical plane (Θ...

Solar air heaters (SAHs) are used in a wide variety of household and industrial applications. Smooth absorber plate traditional solar duct has low value convective heat transfer coefficient. Enhancing the thermal efficiency SAHs can be achieved by using artificial roughness ribs placed on plate. However, this use results increasing pressure loss due to friction between airflow roughened surface...

In this investigation, the effect of replacing conventional solar absorber with a new on thermal performance double-pass air heater has been studied experimentally and numerically. Three configurations have introduced, first configuration is double pass flat plate (DPSAHWFP) for aim comparison, second tubular that includes set tubes which are fitted perpendicularly to direction airflow (DPSAHWT...

This paper presents a micro-fluid gathering tool for a versatile capsular endoscope that employs a solid chemical propellant, azobisisobutyronitrile (AIBN). The proposed tool consists of a micro-heater, an AIBN matrix, a Venturi tube, a reservoir, an inlet, and an outlet. The micro-heater heats the AIBN matrix to be decomposed into by-products and nitrogen gas. This nitrogen gas generates negat...

Defrosting is an important issue that should be considered when air source heat pump operating in a cold climate. For the transcritical CO2 (TCHP) water heater, high pressure affects application of defrosting methods. In this paper, reverse cycle (RCD) and hot gas bypass (HGBD) methods were experimentally investigated TCHP heater. The dynamic characteristics, influences on system operation over...

A hybrid photovoltaic solar assisted loop heat pipe/heat pump (PV-SALHP/HP) water heater system has been developed and numerically studied. The system is the combination of loop heat pipe (LHP) mode and heat pump (HP) mode, and the two modes can be run separately or compositely according to the weather conditions. The performances of independent heat pump (HP) mode and hybrid loop heat pipe/hea...

This paper proposes a methodology to develop a decision-making aid tool which purpose is to assess the dependability and performances of an industrial system. This model is based on a new formalism, called the probabilistic relational model (PRM) which is adapted to deal with large and complex systems. The objective is to evaluate system’s performances in order to optimize the enterprise mainte...

This semester project investigates strategies aimed at controlling the aggregate power demand of large groups of domestic electric water heaters. An existing model of a single electric water heater that considers thermal stratification along the height of the hot water tank was tuned and verified using experimental data. The tuned model was then incorporated into an existing model of a water he...

The large displacements produced by vanadium dioxide (VO2) integrated microelectromechanical systems (MEMS)-based actuators have been precisely controlled through the use of a simple proportional-integral-derivative (PID) controller and an integrated heater. A complete device characterization is performed, including quasi-static response, frequency response, creep, repeatability, and rate depen...