1,721,026 research outputs found
MICROCLIMATE MEASURING AND FLUID-DYNAMICS SIMULATION IN AN INDUSTRIAL BROILERS HOUSE: TESTING OF AN EXPERIMENTAL VENTILATION SYSTEM
No full textThe environment in the poultry house is a combination of physical and biological factors which interact as a complex dynamic system of interactions between birds, husbandry system, light, temperature and the aerial environment. The most important role of ventilation is to remove carbon dioxide and water from the air of the house. Adequate ventilation rates provide the most effective method of controlling temperature within the house and also allows for control of relative humidity and can play a key role in alleviating the negative effects of high stocking density and of wet litter. In the present study the results of experimental tests performed in a breeding broilers farm are shown; in particular the efficiency of a semi transversal ventilation system was studied against the use of a pure transversal one. In order to verify the efficiency of the systems, fluid dynamic simulations were carried out using the software Comsol multiphysics. The results of this study show that a correct architectural and structural design of the building must be complemented by an equally correct mechanical and fluid dynamics design of the ventilation system in order to maintain the environmental parameters within the limits of the thermo-neutral and welfare conditions, to achieve the highest levels of productivity
Comparative Analysis of Ventilation Systems for Aging Salami
Full text linkThe aim of this study was to evaluate the influence of different ventilation systems in two aging cells. One cell featured transverse airflow starting from the top, while the other had a dual-flow
system with vertical air motion from top to bottom and vice versa. In addition to monitoring weight loss during aging, chemical and physical analyses were conducted on various salamis to assess the influence of ventilation both between the two aging cells and among different positions of the salamis within the same cell. It was found that the dual-evaporator (DEV) cell behaved better than transverse flow (TFL) cel
Model definition for 3D phenomena describing microclimate through the use of devices for automatic environment’s detection
No full textWithin the limits of the productive activity, the optimization of the micro-environment concerning a building utilisation can make use of new technical opportunities. The phases of planning and/or checking can be visualized and especially repeatedly modified through devices and software able to carry out 3D models. In these models, the physical-geometrical parameters or the peculiar features of the buildings can be changed and the resulting micro-environment aspects can be directly detected. The more and more close integration between CAD modelling environments and CAE analysis tools allows, on one hand, to modify the geometry by a close control of the size and the geometrical characteristics, and, on the other hand, it allows CAE system to evaluate the effects of different geometric forms or physical parameters on the analyzed micro-environment. In the agro-livestock field there are countless situations called “dynamic situations”. They need a plan of the micro-environment able to take into account the use-changing during each productive cycle. If the study concerns one existing environment, it is necessary to make measures by geometrical instruments or by optional technologies such as the photogrammetry. It allows recreating geometrical details on real scale from high-quality digital photos. The consequent geometrical model can be parameterised subsequently in a CAD environment and transferred to the analysis one for a fluiddynamics study. The geometrical model of the studied environment has been rebuilt by the use of the close photogrammetry software PhotoModeler®. The numerical analysis has been carried out by the multiphysics simulation software Comsol®
The Challenge of Advanced Indoor Control: A new Multi-operative Lab with Innovative Envelope Solutions and Multiple Air-conditioning Systems
No full textIndoor conditions in a confined space are the result of the interactions with the surrounding environments, air-conditioning effects, occupants' presence, and activities. The airconditioning systems' role in controlling the microclimate became fundamental in the last years, but with the COVID-19 pandemic also their crucial task in contamination and infection diffusion emerged, especially in healthcare facilities. The idea of H-MOLISE (Healthcare Multi-Operative Lab for Innovative Structures and Equipment), whose setup is presented below, arose from these considerations. The new lab is under construction in Campobasso (Italy) at the University of Molise and it will aim to test innovative solutions for the envelope (ventilated facades, green roof, etc.) and active energy systems for advanced control of indoor conditions, as can be necessary in hospitals. In particular, it will be possible to simulate a real-scale operating block with an operating room compliant for the most advanced surgeries, or rooms of the civil sector. The lab will be equipped with a multitude of plants and terminals to evaluate their effects on indoor fluid dynamics, air quality, and thermal-hygrometric conditions. The lab plants will be reconfigurable, and a dedicated monitoring and data acquisition system for the main quantities to be controlled will be installed
Microclimatic Monitoring and Analysis in a Hydroponic Greenhouse
No full textIn the last decades, the increasing reduction of per capita arable land and the increasing demand for food requires the development of advanced solutions like soilless cultivations. Hydroponics represents an interesting and efficient response for sustainable cultivations, in particular its evolution hydroponic greenhouse that uses water instead of soil and, so, characterized by a different management. In particular, it is important to well manage not only the cultivation area, but also: structural characteristics of greenhouse, microclimate management, nutrients management. To maximize resources efficiency and quality food production, it is fundamental to characterize the microclimatic parameters and their distribution inside greenhouses.
This work provides the preliminary study to measure and analyze the main microclimatic parameters in a hydroponic greenhouse without microclimatic controlling system, located in Vinchiaturo (Italy), with a set of sensors that acquire data continuously.
After the installation of sensors to monitor the temperature, the humidity and the light intensity, a supervision system was installed to manage and historicize all the measured data.
From the data analysis, an appropriate management of the hydroponic greenhous
Experimental study of a mechanical ventilation system in a greenhouse
No full textGreenhouse cultivation is one of the most energy intensive activities in agriculture. This is especially true in cold climate zone. Generally heating systems involves boilers fed with fossil fuels. This means low yields of the heat generator and high pollutant emissions. Moreover, the increase of annual crop yield in greenhouses is possible only through a very close control of the internal conditions. Ventilation systems could allow proper control of temperature, relative humidity and CO2rate. For this purpose a prototype of a mechanical ventilation unit was installed at service of a mini-tunnel greenhouse. The recovery unit is equipped with a heat pump and is able to increase the thermal energy recovered, by the flow of exhaust air, through a high efficiency heat exchanger. A first study was carried out to evaluate the thermophysical and energy performances of the system during the heating season. The experimental apparatus consists of mechanical ventilation system, a perforated duct for air distribution, a fog system to adjust humidity and a supervision system to acquire the field data. Another dedicated supervision system allows to measure and collect all the parameters of the prototype, such as thermophysical parameter of the air flow, thermophysical parameter of the refrigerant circuit of the heat pump, status and alarms of the unit. To characterize the whole system under investigation the main data measured are temperature, relative humidity and carbon dioxide inside the greenhouse and temperature in all section of the prototype. Other two mini-tunnel greenhouses are monitored as references. One is heated with radiant tubes placed on the bench and humidified with a fog system, the other is completely passively heated (without heating system) and humidified with the same fog system. A First test was performed to evaluate the ability of the system to regulate the indoor temperature of the greenhouse with a set point of 27 °C. By using a temperature probe installed on the return side of the machine, the results shown an appropriate temperature regulatio
Study and proposal for the development of guidelines for areas subject to landscape bond(Molise) in view of energy conservation and improvement
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Study of a mechanical ventilation system with heat recovery to control temperature in a monitored agricultural environment under Summer conditions
No full textProper management of the microclimatic environment plays a main role for a more rational use of energy in greenhouses. In particular, ventilation systems in controlled environment agriculture (CEA) are essential to make the indoor environment as compatible as possible with production needs. In this study, a prototype of mechanical ventilation (SIVeMeC: Integrated System for Controlled Mechanical Ventilation) was analysed in cooling mode by simulating, through two climatic rooms, typical Summer outdoor temperature (i.e., 29 °C, 32 °C, 35 °C, 38 °C and 40 °C) and an indoor set-point of 24 °C. The main results show a very high performance of the system and reliable temperature control within the confined environment. Finally, a comparison was made with a representative commercial unit, which confirmed the suitability of SIVeMeC to efficiently manage the internal temperature
Strategies for energy recovery in respect of quality: an example of rural architecture in Molise
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