Remote sensing image processing using MCDF

Modified conjugate directional filtering (MCDF) is a new method proposed by Guo and Watson in 2002 for digital data and image processing. It provides ability in not only integrating directional-filtered results in conjugate directions into one image that shows the maximum linear features in these conjugate directions, but also further manipulating the outcomes using a number of predefined MCDF operations for different purposes. The use of MCDF (add1) to remote sensing image processing with 2D spectral analysis proves that the MCDF operation brings enhanced information integration operated in two different directions, which is the weaknesses of using the conventional methods in image processing. Its adaptive weighting system offers even more choices in combining selectively intensified results together to achieve a balanced presentation, which cannot be achieved using any traditional processing methods

Non-equilibrium theoretical analysis of resorption power generation cycle with multiple expansions

The performance of the proposed multiple expansion resorption power generation cycle using three typical resorption salt pairs, including sodium bromide - manganese chloride, strontium chloride - manganese chloride and sodium bromide - strontium chloride, have been investigated not just based on theoretical thermodynamics but also with the consideration of practical factors to obtain better understanding and more insights for a real system design. The multiple expansion resorption power generation using sodium bromide - manganese chloride and sodium bromide - strontium chloride pairs can achieve 100~600 kJ/kg (ammonia) work output when heat source temperature is from 30 °C to 150 °C; the multiple expansion using strontium chloride - manganese chloride pair has higher average work output per one expansion stage than that using the other two pairs. The cyclic energy efficiency can be achieved as 0.06~0. 15 when implementing 2~4 expansions in a more practical scenario where the equilibrium pressure drop is set to 2 bar and the heat source temperature is in the range of 80~150 °C. Such efficiencies are circa 27~62% of Carnot efficiency under the same thermal conditions

Numerical calculation of absorption heat transformer to upgrade ultra-low grade waste heat

The data is some calculation results about the performance of a absorption heat transformer to upgrade ultra-low grade heat from 40 to 60 C , including temperature lift and system efficiency. The study was conducted to satisfy the project requirement to seek possible method for low grade waste heat recovery

Advanced Absorption Power Generation Cycles

This data gives the introduction of the proposed advanced absorption power generation cycles, their analysis method and their performance

Ejector modelling for ejection refrigeration system

The data gives all the used modelling equations and the results of an ejector for ejection refrigeration. The key finds of this modelling was the values of hypothetical throat area for the secondary fluid in the ejector, based on which empirical equations have been built for the working fluids of R134a, R141b and steam

Model and parameters for calculating the energy and exergy efficiency of a hybrid absorption-compression high temperature heat pump

This work explored a hybrid absorption-compression heat pump (HAC-HP) to upgrade and recover the industrial waste heat in the temperature range of 60°C–120°C. The new HAC-HP system proposed has a condenser, an evaporator, and one more solution pump, compared to the conventional HAC-HP system, to allow flexible utilization of energy sources of electricity and waste heat. In the system proposed, the pressure of ammonia-water vapor desorbed in the generator can be elevated by two routes; one is via the compression of compressor while the other is via the condenser, the solution pump, and the evaporator. The results show that more ammonia-water vapor flowing through the compressor leads to a substantial higher energy efficiency due to the higher quality of electricity, however, only a slight change on the system exergy efficiency is noticed. The temperature lift increases with the increasing system recirculation flow ratio, however, the system energy and exergy efficiencies drop towards zero. The suitable operation ranges of HAC-HP are recommended for the waste heat at 60°C, 80°C, 100°C, and 120°C. The recirculation flow ratio should be lower than 9, 6, 5, and 4 respectively for these waste heat, while the temperature lifts are in the range of 9.8°C–27.7 °C, 14.9°C–44.1 °C, 24.4°C–64.1°C, and 40.7°C–85.7°C, respectively, and the system energy efficiency are 0.35–0.93, 0.32–0.90, 0.25– 0.85, and 0.14–0.76

Numerical calculation of sodium acetate trihydrate as seasonal solar energy storage material

The data gives the basic thermo-physical properties of sodium acetate solution and sodium acetate trihydrate, including phase diagram, density, specific heat and thermal conductivity. The simulation process of the solidification process of sodium acetate solution is given. The temperature changes of each components in the storage system are given

Increasing reactivity of plasmonic hot holes by a trapping strategy

Plasmonic photocatalysis has emerged as a promising solution for global energy crisis and environment pollution by facilitating wide ranging chemical transformations using photons in a broad region of solar spectrum. Despite numerous successful examples on improvement of electron-driven photochemistry, effective utilization of plasmonic hot holes is a long-standing challenge due to their ultrafast relaxation and short lifetime. Herein, we report that the reactivity of plasmonic hot holes can be greatly enhanced by a novel hot hole trapping strategy. We demonstrate a new concept of a metal-adsorbate interfacial structure that can be in situ constructed on gold (Au) surface in the presence of molecular hydrogen (H2) under plasmonic excitation, where the key is to employ an electron-filled antibonding state hybridized by H1s and Au5d as a localized “trap” to improve utilization efficiency of plasmonic hot holes. This interfacial structure is evidenced by light-induced H2 spillover and d-band model analysis. The prolonged lifetime and preserved oxidation power of plasmonic hot holes was evidenced by superior photocatalytic activity for methylene blue (MB) degradation in the presence of H2 which was accelerated by over 5 times. In addition, FTIR coupled with CO molecular probe reveals that the physical location of hole trapping are low coordinated positions sites on Au nanoparticles. These findings could provide an innovative pathway to increase utilization efficiency of hot holes for visible-light-driven photocatalysis applications

Heating demand and available useful solar heat in different cities in the UK

The data contains three Excel documents with different return water temperatures at 30, 40 and 50 °C respectively. The calculated heating demands of dwellings in 8 different cities in the UK with different heat loss coefficients (50, 150 and 250 W/K) were given; The available useful solar heat from tilted flat-plate solar collector (30, 45, 60°C slope angle, facing south) were calculated and given

Data of calculation results of SSTES system using chemisorption for domestic dwellings in the UK

The data is the calculated results of the performance of a seasonal solar thermal energy storage system using CaCl2-NH3, BaCl2-NH3 or NaBr-NH3 chemisorption for a typical domestic dwelling in Newcastle-upon-Tyne, including the charging performance in the summer and the discharging performance in the winter. The storage volume, stored energy and the fraction of the released heat to the total heat are given