Speaker
Description
This study explores a systematic review of a decentralized ventilation (DV) system compared with conventional centralized ventilation systems adapting Nordic climates. Air ventilation strategies can be classified into three main categories: natural ventilation, mechanical ventilation, and hybrid ventilation. Decentralized ventilation (DV) offers several advantages. For instance, it can simplify individual zoning control in spaces because outdoor air supply volume can be easily controlled by fans in compact decentralized ventilation units. These systems are also less affected by outdoor environmental conditions such as high stack or wind pressure compared to natural ventilation systems, which means they can consistently supply air into a room. This review introduces the systematic performance of a compact mechanical air ventilator designed for decentralized ventilation as a replacement for natural ventilation and conventional centralized ventilation (CV) system in urban areas. The study compares the DV system to conventional CV systems for adapting to Nordic climates. To evaluate acceptable operating conditions for fan-assisted natural ventilation systems as a hybrid ventilation system, the study uses selected Nordic weather conditions and analyzes the cooling and heating loads of the decentralized ventilation system. The research calculates the entire fan and pump loads of the DV system using published data. Compared to conventional centralized ventilation systems, the DV system has shorter air transport distances, resulting in lower fan pressure losses. Additionally, the fan speed and airflow rate of the DV system can be adjusted easily and effectively according to indoor thermal conditions. For example, natural ventilation and centralized mechanical ventilation systems face certain challenges when it comes to adjusting the supply airflow rate effectively based on factors such as indoor occupant rates, air quality, and thermal comfort. The study demonstrates that a radiant panel with a decentralized ventilation system (RPDV) consumes the least amount of heating, ventilation, and air conditioning (HVAC) energy. Especially Norwegian regulations for building constructions does not allow indoor air recirculation, therefore, all-air system has not used in Norway. The radiator, radiant panel or air convection coils for heating and cooling with air ventilation system is quite common in Scandinavian countries. The RPDV minimizes supply and exhaust air pressure losses and can also function as a fan-assisted natural ventilation system during periods when outdoor air can be used without additional thermal loads. This systematic review includes a new analysis of fan and pump energy consumption in the decentralized ventilation system compared to centralized ventilation systems, based on both numerically calculated and measured data. The study provides insights into fan assisted DV systems in Nordic climates, taking into account outdoor weather conditions.
References
M.K.Kim, L.Baldini, Energy analysis of a decentralized ventilation system compared with centralized ventilation systems in European climates: Based on review of analyses, Energy and Buildings, 111, 2016, page 424-433, https://doi.org/10.1016/j.enbuild.2015.11.044
A. Strand, M.K.Kim, Comparative Numerical Energy Analysis of Decentralized Ventilation Adapting to Local Norway Climates, E3S Web of conferences, 2022,362, 11005
M.K.Kim, Ventilation system and heating and cooling, Handbook of Ventilation Technology for the Built Environment: Design, Control and Testing, 2022, pp. 225–246
| Keywords | Decentralized ventilation, indoor air quality, ventilation, energy analysis |
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