Exergy analysis emboldens in cases that all the inefficiencies and bottlenecks to improve energy systems are to be addressed. In this study, a novel vapor compression air dehumidifier integrated with an auxiliary heat exchanger in series arrangement with the main condenser in order to mitigate the reheat coil, and an extra mixing box to recover the ventilated air heat has been introduced. A com...

This paper investigates the application of thermoelectric devices to enhance the performance of conventional vapor compression based air conditioning systems. Thermoelectric devices are capable of converting electrical energy into thermal heat-pumping at a very high efficiency. In this paper, a validated air-cooled heat exchanger simulation tool is used to study the effect of adding thermoelect...

the objective of the present study is the synthesis of mwcnt-tio2 hybrid nanostructures by solvothermal synthesis method with ticl4 as precursor. the heat transfer enhancement due to the use of mwcnt-tio2 nanofluid was investigated. as-prepared hybrid materials were characterized by x-ray diffraction (xrd) and scanning electron microscopy (sem). the results showed that mwcnts were uniformly dec...

Ground Source Heat Hump is one of the emerging technic to utilize the reservoir of geothermal energy in Europe. The crucial factor is to find the optimal length of the borehole to successfully design a heating system. The length of the borehole varies depending on the geographical area, the capacity of the heat pump and heat load of the desired building in consideration. Several methods have be...

Solar air heater is a type of heat exchanger which transforms solar radiation into heat energy. The thermal performance of conventional solar air heater has been found to be poor because of the low convective heat transfer coefficient from the absorber plate to the air. It is attributed to the formation of a very thin boundary layer at the absorber plate surface commonly known as viscous sub-la...

A hybrid air conditioning system, which is composed of a novel gravity-assisted heat pipe (GAHP)-based indirect evaporative cooler (IEC) and direct expansion (DX) cooling coil, proposed investigated here. After developing mathematical model to describe the performance GAHP-based IEC, system evaluated during design day for providing thermal comfort an office building in Poland. The results are o...

The effect of the internal heat exchanger (IHE) on the performance of the transcritical carbon dioxide refrigeration cycle with an expander is analyzed theoretically on the basis of the first and second laws of thermodynamics. The possible parameters affecting system efficiency such as heat rejection pressure, gas cooler outlet temperature, evaporating temperature, expander isentropic efficienc...

Heat exchangers play significant role in refrigeration and air conditioning systems. Ongoing research aims to improve, or at least maintain, the system performance while reducing the size, weight and cost of the heat exchangers. This in turn leads to lower system refrigerant charge and reduced environmental impact. Using heat exchangers with small tube diameters (less than 5 mm) instead of larg...

According to experts’ forecasts, by 2040 the global demand for energy will increase 37%, and renewable sources in next 20 years become fastest growing segment of world energy, their share decade grow about one a half times. Solar is industry among all non-conventional gaining highest rates development comparison with other sources. In this article, authors provide an overview technologies that ...

In concentrated solar energy applications, the Stirling engine is optimum option for extracting mechanical work. The engine's most notable features are minimal noise, vibration, and pollution, as well its capacity to function with any external heat source, including biomass, energy, industrial waste. gamma-type STE-1008 subject of our research. This can handle a maximum charging pressure 10 bar...