Search

Based on rural revitalization in China, the strengths, weaknesses, opportunities and threats model combined with the politics, economy, society and technology model (SWOT-PEST) has been used to comprehensively analyze the advantages, disadvantages, opportunities and threats to the development of rural energy-efficient buildings in Henan Province based on national policies, the local economic development level, the social situation and technology. The results showed that rural energy-efficient buildings have both advantages and disadvantages at the levels of policy, the economy, society and technology, and that overall, rural energy-efficient building development is at an optimum time. On this basis, we proposed energy-saving countermeasures to execute the primary responsibilities of local party committees and governments, enhance innovation in energy-saving technologies and improve the affordability of energy-efficient buildings. These are the three ways to encourage the effective establishment of rural energy-efficient buildings. This study provides references for promoting rural energy transformation and energy-saving policy reform in developing countries. [ABSTRACT FROM AUTHOR]

This research focuses on innovative stealth equipment by integrating a liquid cooling plate and phase change material (PCM), and the temperature rise on the cold surface and PCM melting rate is reported to illustrate the PCM thermal behavior in lifting the heat shielding performance. Results show that the integrated PCM system is effective in delaying the temperature rise within a certain time. A slower temperature rise on the cold surface is found at the first 1200 s, and a significant acceleration in the temperature rise is given within 1200 s ∼ 2000 s as the heat flood breaks through the PCM layer. The PCM melting rate increases rapidly and then rises slowly, and the complete melting time is shortened as increasing heat power. The heat shielding performance is significantly reduced with increasing the liquid flow rate, and the influence of the coolant temperature on the temperature rise becomes more and more prominent as the completion of the PCM melting process. A slower temperature rise is observed at the lower PCM phase transition temperature, and a further increase in the PCM covering layer has little influence on the temperature rise at the initial stage. • PCM built-in water-cooled pipe system is proposed to develop temperature control technology. • Beneficial effect of applying PCM in the improvement of the heat shielding is verified. • Effect of different PCM performance parameter on the improvement of heat shielding is studied. • Mechanism of PCM in improving the heat shielding is revealed using the PCM melting rate. • Heat flood effect of PCM built-in water-cooled pipe system for the temperature control is given. [ABSTRACT FROM AUTHOR]

A roof-mounted radiant cooling system incorporating a bypass structure, intended for use on liquid natural gas (LNG)-fueled refrigerated vehicles and offering stable dynamic regulation was designed. A model was established using the TRNSYS software package to simulate the operation of this system, and the effects of various factors on the refrigeration performance were analyzed. The quantitative relationship between the LNG flow rate and the ambient temperature was determined and a dynamic regulation strategy proposed. The results of this work show that, when the vehicle is operated at an economical speed, the cooling capacity provided by the system is greater than 1.2 kW, which meets the requirements for a refrigerated vehicle. The dynamic regulation approach developed in this study was found to allow use of the refrigerated vehicle under different climactic conditions and to improve the stability of the cooling system. [ABSTRACT FROM AUTHOR]