Abstract Recent studies have shown that surface and gaseous contaminant interactions may play an important role in indoor air quality. Modeling is an important tool to improve our knowledg...

This paper presents the results from simulation work regarding the design of a net zero energy office building with a mixed-mode ventilation system which assures the thermal comfort of the occupants according to the ASHRAE 55/2010 Standard, with a rational consumption of energy and a minimal environmental impact. This was a particular difficult task as the studied city, New Delhi, is one of the most polluted in the world. The study relied on the use of easily accessible building materials and customary Air Conditioning (AC) equipment, in order to meet the requirements. For this purpose, three different AC systems had been selected: a Chilled Beams (CB) system, a Fan Coil Units (FCU) system, and a Variable Refrigerant Flow (VRF) system. All the simulations have been performed within the Design Builder platform, a user-friendly interface of the Energy Plus software. The chilled beams AC system came on top of the energy performance ranking, with 4,6% less energy consumption than the fan coil units system and 2,3% less than the variable refrigerant system, for a payback period of 11,3 years. As for the energy production, 160 modules of photovoltaic panels with a total energy yield of 64260 [kWh/year] were used to cover the building electrical needs (lighting and appliances)

The development of photovoltaic (PV) market needs to improve the knowledge of the electrical production of a PV system on various given sites particularly to estimate its economical profitability. This accurate estimation of the energy production can only be achieved by taking into account the effects of shading that have dramatic consequences on the produced power. In this paper, we tested a two-diode I-V model of m-Si PV module (BP585F) under normal insolation conditions; then, after a brief explanation of the electrical behaviour of a totally or partially shaded PV cell, we present the implemented experimentation. These tests allow validating partially this model for shaded PV module. At last, the power loss induced by the shading has been estimated.

Decentralized ventilation systems in schools are becoming more important due to the focus on indoor air quality and energy economy. The research aims to explore how these technologies affect classroom air quality, thermal comfort, and noise. The study examined four decentralized ventilation systems in a real-world school using field measurements and data analysis. This included measuring the CO₂, temperature, noise, and thermal comfort using the Predicted Mean Vote (PMV) index. All systems greatly improved the air quality, keeping CO₂ levels within suggested limits. They failed to control indoor humidity, often lowering it to below optimal levels. Noise surpassed the 35 dB(A) criteria at maximum operation but was acceptable at lower airflows. Noise and air drafts did not bother residents. The study found that decentralized ventilation systems improve air quality and are easy to adapt to, although they need humidity control and noise management at higher operational levels.