Upon an improvement in the quality of life, air-conditioning has generally been applied. Nevertheless, environmental and health issues related with the use of air-conditioning occurs more often. Therefore, this paper aims to theoretically assess the principles of sustainability to achieve sustainability for renewable smart air-conditioning. Not only with consideration to the geometry (i.e. system mechanisms and components), fuzzy logic control and proportional-integral-derivative that such studies drawn particular attention to, but with concerns to a matter which has been previously ignored. That is with consideration to the potential which the renewable-based options, advanced smart control technique and profitability measures of air-conditioning reinforces the three pillars of sustainability, and their sustainable indicators as context-specific transformations have, to not only eradicate indoor health effects, lower the levels of energy consumption and rate of carbon emissions, but to uncover the significance of and particular contribution renewables and smart control opportunities makes to the sustainability of the system. In meeting this aim and demonstrating the sustainability of the theoretical framework, this paper reveals renewable and smart control system as the fundamental key components of the air-conditioning as it promotes to reduce levels of energy consumption and lower carbon emissions, vis-à-vis establish a comfortable and healthy indoor environment as an exercise in the sustainable theoretical framework whose status as renewable smart air-conditioning not only tackle poor indoor air quality but also combat global warming and climate change.

Substandard ventilation in restricted air-conditioning indoor places is allied with upsurge in the respiratory infections’ transmission. There have been several COVID-19 spread occurrences connected with indoor environment, together with a few from pre-symptomatic situations. Ventilation role in averting coronavirus transmission is not precise (i.e., through inhibiting transmission of an infectious dose to susceptible individuals or preventing the spreading of contagious particles to lessen the risk of transmission). SARS-CoV-2 is believed to be mainly spread through significant respiratory droplets, nevertheless, a growing amount of epidemic information associate aerosol role in the epidemics of coronavirus. Aerosols comprise of droplet nuclei and little droplets which stay in the air for longer than significant droplets. Recent studies show that coronavirus particles can stay transmissible on numerous substances, including aerosols within the indoor environments, as well as the contagion period contingent on humidity and temperature. Thus far, COVID-19 transmission via air-conditioning systems is unclear, but it is considered possible.

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This paper aims to present renewable air-conditioning as a sustainable system for varied climatic conditions with the feasibility of optimization to reduce the level of energy consumption and the rate of carbon emissions. Extreme use of air-conditioning has caused substantial growth in the level of energy consumption and carbon emissions. This fact clarifies the requirement for considering improvement applications of renewable energy sources for air-conditioning systems. The components of solar air-conditioning are studied and employed as the basis for system optimization. The approach this paper presented implements a key component-based modelling analysis of renewables and modelling concepts that the geometry of this air-conditioning is founded on. The optimized model is performed using Polysun program, a renewable system analysis tool. As an exercise in the system modelling, the principle component analysis also accounts for the renewables of air-conditioning in relation to the context of the application and with respect to their integration into the climatic conditions of London, Toulouse and Rome. This, in turn, allows for the interpretation of the findings on the significance of renewables in energy consumption and carbon emissions. It also allows for the generation of a sustainability-based system that can reduce the level of energy consumption and the rate of carbon emissions. In this way, this paper uncovers the significance of renewables as a source of clean energy and sustainable practice in air-conditioning. It also reveals the particular contribution they make to the levels of energy consumption and carbon emissions that not only tackles global warming but also combats climate change.