Effects Of Temperature Parameters Research Articles

Absorption seasonal thermal storage cycle with high energy storage density through multi-stage output

Absorption thermal storage is attractive due its small thermal loss during long term storage, which is advantageous for seasonal solar thermal storage. For the long term storage, high energy storage density is favorable to ensure a compact system. In this paper, the novel absorption seasonal thermal storage cycles with multi-stage output processes are proposed. Comparing to the conventional cycle with single stage output, larger concentration glide could be achieved by the proposed cycles under the same condition, resulting in high energy storage density. Performances of the water-LiBr absorption thermal storage cycles with double stage output and triple stage output are calculated and compared with that of the conventional single stage cycle. Energy flows, effects of temperature parameters, and working pair comparison are analyzed. For typical condition of solar thermal charging in summer and heat output in winter with output temperature of 50 °C, the proposed cycles with double stage output and triple stage output have 75.4% and 82.3% less heat losses, and achieve 7.32 times and 6.78 times higher energy storage densities than the single stage cycle. The proposed absorption thermal storage cycle with multi-stage output could be a good option for seasonal solar thermal energy storage.

Seasonal dynamics of the phenotypic structure of a natural Epischura baicalensis Sars population from quantitative morphological traits

The seasonal dynamics of the phenotypic structure of a natural E. baicalensis Sars population from Southern Baikal was studied from the number of bristles on the 5th and 6th segments of the antenna (BNA), the length of the 5th and 6th segments of the antenna (5LAS and 6LAS), cephalothorax length (CL), and the length of the 5th pair of swimming legs (SLL) in 2001 and 2004. The phenotypic structure in terms of BNA, 5LAS, and 6LAS is characterized by the presence of bimodality and, in terms of CL and SLL, it has a normal distribution. The seasonal dynamics of the arithmetic mean of the whole population is determined by changing the ratio of the number of individuals in classes with low and high values of traits. The increase in the arithmetic mean is accompanied by decreased variability. The effect of temperature parameters on the quantitative morphological traits is discussed.

Nonlinear convection in a non-Darcy porous medium

In this paper, the natural convection in a non-Darcy porous medium is studied using a temperature-concentration-dependent density relation. The effect of the two parameters responsible for the nonlinear convection is analyzed for different values of the inertial parameter, dispersion parameters, Rayleigh number, Lewis number, Soret number, and Dufour number. In the aiding buoyancy, the tangential velocity increases steeply with an increase in the nonlinear temperature parameter and the nonlinear concentration parameter when the inertial effect is zero. However, when the inertial effect is non-zero, the effect of the nonlinear temperature parameter and the nonlinear concentration parameter on the tangential velocity is marginal. The concentration distribution varies appreciably and spreads in different ranges for different values of the double dispersion parameters, the inertial effect parameter, and also for the parameters which control the nonlinear temperature and the nonlinear concentration. Heat and mass transfer varies extensively with an increase in the nonlinear temperature parameter and the nonlinear concentration parameter depending on Dacry and non-Darcy porous media. The variation in heat and mass transfer when all the effects, i.e., the inertial effect, double dispersion effects, and Soret and Dufour effects, are simultaneously zero and non-zero. The combined effects of the nonlinear temperature parameter, the nonlinear concentration parameter and buoyancy are analyzed. The effect of the nonlinear temperature parameter and the nonlinear concentration parameter and also the cross diffusion effects on heat and mass transfer are observed to be more in Darcy porous media compared with those in non-Darcy porous media. In the opposing buoyancy, the effect of the temperature parameter is to increase the heat and mass transfer rate, whereas that of the concentration parameter is to decrease.

Temperature dependent parameters of stability and protection in an adiabatic niobium titanium coil

Experiments were performed to determine temperature-dependent parameters of stability and protection in a small adiabatic niobium titanium test magnet. Quench propagation velocity and minimum quench energy were measured as a function of operating temperature, transport current, and magnetic field. The operating temperature was controlled in an isothermal environment between 4.2 K and approximately 8 K. A computer code was modified to predict the magnet's behavior accurately within the temperature range. The aim was to develop improved analytical models of the effect of temperature parameters on stability in order to expand the understanding of the thermal behavior of adiabatic magnets operating at temperatures up to approximately 100 K.