Environmental parameters assessment of a new diffuser for air cooling/heating system: Measurements and numerical validation

Abstract

Air distribution of HVAC systems is the most popular type used in the building sector, having a relevant impact on indoor air quality and occupant wellness. The balance between guaranteeing indoor thermal comfort and reducing energy consumption has become a significant issue in the last years, especially connected to the building construction. In line with this, this research investigates the potentialities of a new air diffuser type, installed in the ceiling of an exhibition room. This system provides a variable mass flow rate thanks to its configuration, allowing to determinate a good thermal comfort. A warm wall is chosen as the heating system. Several tests are carried out, six for cooling and two for heating with different volumetric air rate and supply air temperature of the diffusers. The combination of two methods, the measurements campaigns and the Computational Fluid Dynamics techniques, allows studying the thermal indoor environment. In general, results show a strong capability of this diffuser to provide a uniform temperature and velocity field inside the room. Moreover, experimental and numerical data are significantly comparable giving an average deviation of 1% for the velocity and lower 1% for the temperature. According to this, it is evident that the design of INDULINE allows to obtain optimal temperature and velocity distribution on the vertical and horizontal planes.

Mitigation of Renewable Energy Source Production Variability in Residential Stock through Small-Scale Gas–Liquid Energy Storage Technology Application

“…I prototype, the oil flow is controlled by the oleo-dynamic circuit shown in the diagra Figure 2a. A Marzocchi ALP 1D-5 gear pump (Bologna, Italy), with a displacement o cm 3 /revolution and delivering a flow of 5 L/min at a rotation speed of 1500 rev/m inserted inside the tank, from which it draws the oil (Eni OSO VG46 hydraulic oil, R Italy), driven by a 0.37 kW SMEM electric motor (Monza, Italy). The selected flow r set and kept constant, regardless of load changes, by means of a compensated flow r lator.…”

“…This urgency is also due to the progressive deterioration in environmental conditions [1]. International energy forecasts estimate that the building sector will consume 40% of global energy by 2050 [2,3]. Buildings use electricity to light, heat, cool, operate equipment, and operate appliances; these uses represent half of the total electricity consumed and some 42% of global CO 2 emissions.…”

A new concept of a thermal network for energy resilience in mountain communities powered by renewable sources

“…Moreover, the energy crisis event, started in 1970, was a crucial sign for pushing European countries from fossil fuel usage to the newest independent sources, such as renewable ones (Lund et al 2014;Buffa et al 2019;Frederiksen and Werner 2014). To face with the current energy and environmental forceful call, academic researchers together with technologies industries developed strategies for conserving energy related to the thermal insulation, double-and triple-glazed windows, solar shading (Mattoni et al 2019), efficient HVAC systems (Nardecchia et al 2022), and the use of renewable and green energy sources. Considered as a promising green alternative solution, the District Heating (DH) network has been developed through the years (Lund et al 2010).…”

Computational analysis of a new biomimetic active ventilation paradigm for indoor spaces

“…The advancement in commercial computational fluid dynamics (CFD) packages has made them more available and commonly used to simulate and help design ventilation and air conditioning in indoor structures (Li and Nielsen, 2011). Computational models were implemented for different rooms to simulate natural ventilation via designed openings with and without human models (Detaranto, 2014; Etheridge, 2015; Gilani et al , 2016; Mousa et al , 2017), as well as the efficiency and air quality of air conditioning for different designs of air inlets and outlets (Hormigos-Jimenez et al , 2018; Nardecchia et al , 2022; Ning et al , 2016; Younsi et al , 2019). It should be noted that the efficiency of interior ventilation is subjected to the definitions and assumptions of the specific study or regulation (Bazant and Bush, 2021; Liddament, 1993; Sandberg, 1981; Zhang et al , 2021).…”