A membrane-based enthalpy exchanger is a device used for heat and humidity recovery in ventilated buildings. The energy-saving potential of such dependent on the parameters responsible moisture recovery. trend toward composite membranes, which are custom produced, their can be adjusted given application; therefore, diffusion sorption characteristics membranes unknown. In order to obtain values ...

Mechanical loss spectra (two peaks) observed in ZrO, doped with Y,O, (2-10 mol%), are attributed to oxygen vacancy 0-yttrium (Y) associates (V-Y pairs and V-2Y agglomerates). Both peaks were analysed numerically by applying the coupling model. It has been shown that: i) the activation enthalpy H for both peaks increases with Y20, content, ii) the values of coupling parameter n are about 0.6 0.7...

Using a mixed basis pseudopotential method, total energy calculations were performed to obtain the enthalpy of vacancy formation in Ta as a function of pressure, which is important for understanding the effects of pressure on mechanical properties. The vacancy formation enthalpy is found to increase from 2.95 eV at ambient pressures to 12.86 eV at 300 GPa, and the vacancy formation volume decre...

polycyclic aromatic hydrocarbon (pah) plays an important role in the formation of combustion-generatedparticles such as soot, and their presence in atmosphere aerosols has been widely shown. the formation of five-membered rings, detected in combustion effluent, is of great interest due to their genotoxic activity.the present study reports an investigation of the electronic structure of acenapht...

Heats of thermal denaturation of chromatin core particles and core particles with covalently crosslinked histones were measured by differential scanning calorimetry. The additional stabilization of the nucleoprotein complex by crosslinking is not reflected in the transition enthalpy. The contribution of protein denaturation to the total heat was estimated by comparison of core particles with co...

To measure enthalpy densities, respectively overall specific heats, frequently the differential scanning thermal analysisis (DSC) is applied. Other useful methods are also available, but all of them have disadvantages. Therefore, an alternative measurement procedure the online enthalpy measurment method which was presented six years ago, has now been further improved. The quality of the results...

Introduction High enthalpy geothermal systems have been harnessed for electrical power generation for over a 100 years. While the classification scheme for low, medium, and high enthalpy systems varies for different authors (Axelsson and Gunnlaugsson 2000; Benderitter and Cormy 1990; Hochstein 1990; Kaya et al. 2011; Muffler and Cataldi 1978; Nicholson 1993), reservoir temperatures above 150–22...

Nomenclature H AW adiabatic wall enthalpy (J/kg) H w wall enthalpy (J/kg) H 0 total enthalpy (J/kg) h heat transfer coefficient (kg/m 2 /sec), h FR reference Fay-Riddell heat transfer coefficient (kg/m 2 /sec) L model reference length (m) M ∞ free stream Mach number q FR reference Fay-Riddell heat transfer rate (W/m 2) Re ∞ free stream unit Reynolds number (1/m) T ∞ free stream temperature (K) ...