Tingzhen Ming

Unsteady numerical simulation of solar chimney power plant system with energy storage layer

Abstract Numerical simulations were carried out to analyse the performance of the solar chimney power plant systems with energy storage layer in this paper. Mathematical models were developed to describe the flow and heat transfer mechanisms of the collector, chimney and the energy storage layer, and the responses of different energy storage materials to the solar radiation, and the effects of these materials on the power output with different solar radiations were analysed. Numerical simulation results show the following: first, soil and gravel both have suitable values of the property of thermal inertia, and they could be used as energy storage material for the solar chimney system; second, energy storage layer with comparatively higher heat capacity can store more energy on sunny days and can thus effectively decrease the variations of the chimney outlet parameters caused by the fluctuations in solar radiation related to the day-night cycle; third, the higher the temperature of the energy storag...

Simple analysis on thermal performance of solar chimney power generation systems

A simple analysis is made on the air flow through a solar chimney power generation system and a thermodynamic cycle of the system including the environment is established. Later, mathematical models for the ideal and actual cycle efficiencies are also established. The research results show that the ideal cycle efficiency and actual efficiency of standard Brayton cycle corresponding to medium scale solar chimney power generation system are 1?33 and 0?3% respectively, while the same parameters for large scale solar chimney power generation systems are 3?33 and 0?9% respectively. The results can give a theoretical guidance to the commercial application of solar chimney power generation systems in China.

Fighting global warming by greenhouse gas removal: destroying atmospheric nitrous oxide thanks to synergies between two breakthrough technologies.

Even if humans stop discharging CO2 into the atmosphere, the average global temperature will still increase during this century. A lot of research has been devoted to prevent and reduce the amount of carbon dioxide (CO2) emissions in the atmosphere, in order to mitigate the effects of climate change. Carbon capture and sequestration (CCS) is one of the technologies that might help to limit emissions. In complement, direct CO2 removal from the atmosphere has been proposed after the emissions have occurred. But, the removal of all the excess anthropogenic atmospheric CO2 will not be enough, due to the fact that CO2 outgases from the ocean as its solubility is dependent of its atmospheric partial pressure. Bringing back the Earth average surface temperature to pre-industrial levels would require the removal of all previously emitted CO2. Thus, the atmospheric removal of other greenhouse gases is necessary. This article proposes a combination of disrupting techniques to transform nitrous oxide (N2O), the third most important greenhouse gas (GHG) in terms of current radiative forcing, which is harmful for the ozone layer and possesses quite high global warming potential. Although several scientific publications cite “greenhouse gas removal,” to our knowledge, it is the first time innovative solutions are proposed to effectively remove N2O or other GHGs from the atmosphere other than CO2.

Heat transfer enhancement by filling metal porous medium in central area of tubes

Abstract Given that the fluid within the tubes of some industrial heat exchangers is under a state of fully developed laminar flow with a constant Nu number, increasing the surface area for heat transfer will significantly increase the flow resistance. In this paper, we filled metal porous medium with high thermal conductivity, high porosity and high filling radius in the central area of fully developed laminar flow within the tube, and established corresponding numerical models for fluid flow and heat transfer. Numerical simulation results indicate that after filling the tube with metal porous medium, the temperature profiles within the porous medium area are very uniform, and the temperature difference between the tube wall and the fluid decreases significantly which correspondingly results in a notable increase of Nu number; meanwhile, the characteristic of flow field redistribution occurs within the enhanced tube, but the total flow resistance composed of the Darcy resistance and inertial resis...

Thermoeconomic analysis and multiobjective optimization of a combined gas turbine, steam, and organic Rankine cycle

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Multiobjective optimization design of the solar field and reverse osmosis system with preheating feed water using Genetic algorithm

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Thermal Comfort and Pollutant Transport in Outdoor Street Buildings

With the development of economic construction in China, the scale of city is on a high speed extension (Cao et al. in Population and Environment 33:137–60, 2012; Cheng and Masser in Landscape And Urban Planning 62:199–217, 2003).

A Solar Chimney with an Inverted U-Type Cooling Tower to Mitigate Urban Air Pollution

The idea of solar chimney power plant (SCPP) was first put forward by Schlaich et al. (Journal of Solar Energy Engineering 127:117–124, 2005 [1]). It is based on the utilization of the air density decrease with increasing temperature. The air is heated in a solar collector, then it rises inside a chimney driven by buoyancy, and it drives turbines to generate electricity. In 1983, the world’s first SCPP was built in Manzanares, Spain. This experimental SCPP with 194.6 m chimney height and 5.08 m radius was fully tested and validated till 1989.

Heat Transfer and Pollutant Dispersion in Street Canyons

The Heat transfer rapid economic development with a dramatic growth of urbanization has induced many environmental issues. The emission of various pollutants into the atmospheric is one of the most severe pollutions, which directly associated people’s health problems in urban air environment.

Filed Synergy Analysis on Pollutant Dispersion in Built Environment

Guo et al. (Int J Heat Mass Transf 41:2221–2225, [1]) firstly put forward the concept of field synergy between the velocity distribution and the temperature distribution.