• Energy Research
• 2025-2025close
• 12. Responsible consumption close
• 2. Zero hunger close
• CN close

With the development of the world, the energy crisis has become increasingly prominent, which has greatly affected the sustainable development of the global economy. To ease the energy crisis and move towards sustainable development, the recovery of low-grade waste heat has gained increasing attention. Through a literature tracking strategy, this report provides the current state of research on internal leakage of the scroll expander, a key component of the organic Rankine cycle system. The structure, working principle, heat transfer and expansion efficiency of the scroll expander are introduced. The types of internal leakage, calculation model of leakage, influencing factors, influencing factors and solutions are analysed in detail. The main influencing factors of internal leakage are axial clearance, radial clearance, speed, air pressure, lubricating oil and so on.

Plant factory with artificial light (PFAL) is a promising technology for relieving the food crisis, especially in urban areas or arid regions endowed with abundant resources. However, lighting and HVAC (heating, ventilation, and air conditioning) systems of PFAL have led to much greater energy consumption than open-field and greenhouse farming, limiting the application of PFAL to a wider extent. Recent researches pay much more attention to the optimization of energy consumption in order to develop and promote the PFAL technology with reduced energy usage. This work comprehensively summarizes the current energy-saving methods on lighting, HVAC systems, as well as their coupling methods for a more energy-efficient PFAL. Besides, we offer our perspectives on further energy-saving strategies and exploit the renewable energy resources for PFAL to respond to the urgent need for energy-efficient production.