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

Theoretical thermodynamic analysis on resorption power generation and pumpless ORC

Resorption power generation cycle (RPGC) has been theoretically investigated and compared with pumpless organic Rankine cycle (PORC). The PORC operates without a liquid pump in conventional ORC and shares the similar configuration with RPGC. Three different organic fluids (pentane, R123 and R245fa) used in PORCs and four different reactant salts (manganese chloride, strontium chloride, barium chloride and sodium bromide) used in RPGCs have been analysed and evaluated in terms of the power generation capacity, thermal efficiency and energy density under the conditions of heat source temperature from 60 °C to 180 °C and heat sink temperature at 30 °C. The RPGCs have been analysed at ideal equilibrium conditions. Resorption power generation system using a pair of two same salts has been studied for the first time

Data supporting A hybrid Reverse Osmosis/Adsorption desalination plant for irrigation and drinking water

Technical data underpinning the publication A hybrid Reverse Osmosis/Adsorption desalination plant for irrigation and drinking water includes the modelling results and assumptions

Model, parameters and experimental data quantifying the macroscopic spray characteristics of next-generation bio-derived diesel fuels in comparison to mineral diesel

This data includes the results of the fuel spray tests, the validation of the numerical model and post-processing

Solar photovoltaic-thermal collector integrated with thermochemical sorption thermal energy storage

Modelling and simulation of the electric and thermal energy generation performance of a solar photovoltaic-thermal collector; using MATLAB and ANSYS Fluent software; potential study of the integration with hot water tank for daily domestic hot water use or with thermochemical sorption system using SrCl2-NH3 working pair for seasonal thermal storag