This experimental investigation exemplifies the design and testing of diffuser at compressor inlet nozzle condenser outlet in vapour compression refrigeration system with help R134a refrigerant. The divergence angle 12°,14° convergent are designed for same diameters. Initially diffusers tested is used diameter equal to exit tube evaporator suction compressor. Diffuser helps increases pressure r...

This paper reports on an experimental investigation on the effects of air gap, wind and walking motion on the thermal properties of traditional Arabian thawbs and Chinese cheongsams. Total thermal resistance (It) and vapour resistance (Re) were measured using the sweating fabric manikin – ‘Walter’, and the air gap volumes of the garments were determined by a 3D body scanner. The results showed ...

A numerical algorithm for kinetic modelling of droplet evaporation processes is suggested. This algorithm is focused on the direct numerical solution of the Boltzmann equations for two gas components: vapour and air. The physical and velocity spaces are discretised, and the Boltzmann equations are presented in discretised forms. The solution of these discretised equations is performed in two st...

Here we report that the equation of state (EOS) of Mo is obtained by an integrated technique of laser-heated DAC and synchrotron X-ray diffraction. The cold compression and thermal expansion of Mo have been measured up to 80 GPa at 300 K, and 92 GPa at 3470 K, respectively. The P-V-T data have been treated with both thermodynamic and Mie-Grüneisen-Debye methods for the thermal EOS inversion. Th...

A theoretical investigation of the effect gas velocity oscillations on droplet number density and evaporation rate is presented. Oscillations in cause a wave, i.e. an inhomogeneous, unsteady variation concentration. The as it propagates downstream at mean flow speed, causes modulation local rate, creating vapour wave with corresponding equivalence ratio. present work devises analytical formulat...

The performance of heat transfer is the essential area research in field thermal engineering. For process transfer, there are numbers refrigerants which used domestic refrigeration to from low-temperature reservoir high-temperature reservoir. vapour compression technology has made a great improvement over few decades form efficiency cycle through significant efforts engineers and manufacturers....

Recent interest in natural refrigerants has created a new impetus for studies of CO2 as a working fluid in vapour compression systems for refrigeration and air conditioning. Two major drawbacks to its use are the very high pressure differences required across the compressor and the large efficiency losses associated with the throttling process. To overcome the throttle losses, a number of propo...

A heat transfer model of boiling flow in steam heated calandria tubes is presented. The model predictions for vapour formation, heat transfer and pressure difference are compared with experimental data and yield reasonable agreement. Characteristic curves are presented showing predicted evaporation rate, heat transfer and pressure difference for a set of parameters representative of a high grad...

In an experimental investigation of the transient processes that occur when a single droplet of butane at the superheat limit vaporizes explosively, short-exposure photographs and fast-response pressure measurements have been used to construct a description of the complete explosion process. It is observed that only a single bubble forms within the drop during each explosion, and that the growt...

Surface plasmon resonance (SPR) is used in a wide range of applications, including biology, physics and materials science, because its ability to obtain sub-wavelength measurements from simple white light source, real time non-invasively. Surprisingly, this technique just beginning be the field phase change heat transfer, whereas fundamental phenomena occurring near interfaces, such as ice, liq...