Keywords: Technology: general issues ; History of engineering & technology ; indoor air quality ; high occupancy rate ; natural ventilation ; university building ; intelligent packaging ; temperature ; humidity ; supply chain ; food waste ; food quality ; food preservation ; transportation ; grain bin ; PCM ; phase change temperature ; energy saving ; PCM latent heat ; mobile public toilets ; thermal environment ; public health security ; mechanical ventilation ; aerosol transmission risk ; underground commercial buildings ; field measurement ; air distribution optimization ; M-cycle ; evaporative cooling ; solid desiccant ; humidification–dehumidification desalination ; water production ; load data analysis ; demand side management (DSM) ; rural home hotels ; cluster control strategy ; PCM storage ; air conditioning system ; pattern recognition ; clustering ; correlation analysis ; defrosting operation mode ; low-carbon substation ; climate zones ; envelope thermal design ; window to wall ratio ; shape factor ; chillers ; fault diagnosis ; fusion ; residual ; data ; air-conditioned bed system ; heat conduction heating ; convection heating ; thermal comfort ; energy conservation ; genetic algorithm ; existing office parks ; whole life cycle ; cost benefits ; carbon reduction ; retrofit ; relative humidity ; CO concentration ; CO2 concentration ; cooking procedure ; n/a