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Pierre-Emmanuel Bournet

Pierre-Emmanuel Bournet
Agrocampus Ouest, Angers, France. Research Unit EPHor Environmental Physics and Horticulture

About

98
Publications
25,091
Reads
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1,138
Citations
Citations since 2016
35 Research Items
737 Citations
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Additional affiliations
January 2001 - present
Agrocampus Ouest
Position
  • Professor

Publications

Publications (98)
Article
Computational Fluid Dynamics (CFD) approach is a versatile technique being applied to multiple areas of knowledge. CFD approach has contributed to comprehensively understand the complexity of biological systems and it has gained relevance since the end of the twentieth century. CFD became the key approach to replicate spatiotemporal phenomena combi...
Article
Full-text available
The energy balance components of a greenhouse as well as the greenhouse design may strongly impact the greenhouse energy. Few studies were devoted to the description of the energy balance components of a greenhouse located in the semi arid region of the southern Mediterranean basin, and no attention was paid to the prediction of the inside air temp...
Article
This datasheet on Urban Horticulture covers Identity, Overview, Description, Further Information.
Article
Full-text available
In the context of climate change, Nature-Based Solutions (NBSs), a recently developed concept, are increasingly considered as part of the adaptation strategies of the cities. Studies using expert models and methods (EMM) receive a great deal of scientific attention. Considering EMM increasing use, this study aims to perform an analysis of the repor...
Article
Cities experience overheating due to factors such as urban form and materials, concentration of human activities, reduction in the amount of vegetation and water surfaces. Vegetation is one of the ways to reduce temperature peaks in the city during heat waves. The objectives of this paper are twofold: first, to study the impact on the microclimate...
Article
The ecosystem services provided by urban plants strongly depend on the plants’ well-being. Indeed, environmental factors such as soil compaction, shading and irrigation can affect plant physiology, growth, and aspect. Plants in cities are often living in stress-inducing environments characterized by unfavorable and fluctuating aerial and subterrane...
Article
Full-text available
In order to cope with water scarcity, improved water management should be implemented to reduce water inputs without affecting production. A better quantifying of the heat and water vapour transfers in response to water restriction is thus needed. Distributed climate models, with the addition of transfers through the substrate-plant-atmosphere cont...
Article
Raising poultry in livestock buildings requires housing that can provide acceptable living conditions in terms of climate and air quality. Accurately assessing the interior climate dynamics of a naturally ventilated poultry house needs advanced computer-based modelling tools. The present work proposes a three-dimensional modelling tool that uses co...
Article
Full-text available
Air inside poultry houses must be removed on a regular basis to prevent excess of heat, particles and noxious gases that can imperil animals. To cope with this issue, natural ventilation could be an effective method when assisted by accurate predictions. This study investigates air discharges caused by natural ventilation of a poultry house by mean...
Article
Full-text available
Since agriculture is known as the main consumer of water in the world, reducing water inputs to crops appears a real challenge. This is true in particular in greenhouse ornamental systems, where a compromise must be found to reduce water inputs without impacting plant quality. Indeed, it is known that water restriction tends to limit plant height a...
Article
Full-text available
In greenhouses, reducing water consumption by increasing water efficiency is of great interest in order to limit the environmental footprint of cultivation and reduce costs. However, satisfactory irrigation is needed to get plants of a good quality. When reducing water inputs, if the quality decreases because of visible physical adaptations, these...
Article
Cucumbers grown in heated greenhouses represent an important economic activity in western France (Loire Atlantique). Heating makes it possible to crop three times a year, but with high energy consumption, corresponding to 20-40% of the total cost. It is therefore necessary to improve energy efficiency while maintaining the productivity and quality...
Article
Full-text available
The energy balance components of a greenhouse as well as the greenhouse design may strongly impact the greenhouse energy. Few studies were devoted to the description of the energy balance components of a greenhouse located in the semi arid region of the southern Mediterranean basin, and no attention was paid to the prediction of the inside air temp...
Article
In greenhouses, reducing water consumption by increasing water efficiency is of high interest. Water need is linked to the plant transpiration, which itself depends on the stomatal resistance (Rs). Up until now however, prediction of Rs through models was mainly conducted for well-watered plants in open field conditions and very few models exist fo...
Article
In greenhouses, reducing water consumption by increasing water efficiency is of high interest. Water need is linked to the plant transpiration, which itself depends on the stomatal resistance (Rs). Up until now however, prediction of Rs through models was mainly conducted for well-watered plants in open field conditions and very few models exist fo...
Article
Full-text available
The greenhouse design as well as the cover material properties in particular may strongly impact the greenhouse energy. To study the effect of these parameters, three typical unheated greenhouses equipped with rows of canopy were considered. Experiments were launched to establish the boundary conditions and validate the model. Two parametric studie...
Article
Predictive models of soil-plant-atmosphere water transfers may be helpful to better manage water inputs to plants in greenhouses. In particular, Computational Fluid Dynamics appears to be a powerful tool to describe the greenhouse microclimate and plant behavior. Up until now, most models for potted plants grown in greenhouses were established for...
Article
Full-text available
Abstract The stomatal resistance (Rs) appears as a key parameter governing plant transpiration. For that reason, it has deserved a particular attention of modelers. Up to now however, most models were multiplicative models established at a given plant growth stage and not valid at another growth stage. In this prospect, the objective of the present...
Article
In greenhouses, optimized plant crop management is crucial for environmental reasons and for maintaining the competitiveness of the horticultural sector. In particular, optimizing water consumption is of high interest but requires predictive models needing leaf stomatal resistance (Rs) estimation. Until now, most studies deduced Rs by inverting the...
Article
Full-text available
Indoor microclimate is important for crop production and quality in greenhouse cultivation. This paper focuses on microclimate study based on a computational fluid dynamics (CFD) model of a typical three different greenhouse (tunnel, Venlo and a plastic vertical wall greenhouse) popularly used in the world. A simulation model has been developed in...
Article
Full-text available
In greenhouses, reducing water consumption by increasing water efficiency is of high interest. To reach this goal, predictive models of soil-plant-atmosphere water transfers may be used. However such models have been mainly developed for open field conditions and very few models exist for greenhouse plants grown in pots. Implementing these models r...
Article
Full-text available
Greenhouse design and cover material properties may strongly impact greenhouse energy. To study the effect of these parameters, three typical unheated agricultural buildings equipped with rows of canopy were considered, and two-dimensional simulations were conducted using the discrete ordinate model for simulating radiative transfers. Experiments w...
Article
Full-text available
Natural ventilation represents a strong tool for ameliorating climate and air quality in poultry houses if the benefits of weather conditions can be maximised. To that end, this investigation analyses the impact of natural ventilation on the dynamics of the internal climate of a poultry house focussing on the role played by the outside climatic par...
Article
In greenhouses, reducing water consumption by increasing water efficiency in order to fulfil the requirements of sustainability is a challenge. To reach this goal, we need to better understand the water demand of plants. Transpiration is the main mechanism involved in water transfer, which is controlled by stomatal resistance Rs. Predictive models...
Article
Peat Matric potential Stomatal resistance Penman Monteith Water restriction In greenhouses, reducing water consumption by increasing water efficiency is of high interest. To reach this goal, predictive models of soil-plant-atmosphere water transfer could be helpful. However, such models have been mainly developed for open field conditions, and very...
Article
Full-text available
In the context of increasing energy costs, alternative methods to the energy consuming venting-heating method must be considered for greenhouse dehumidification. In this paper the performance of a heat pump used as a dehumidifier is investigated. Contrary to the classical control aiming at maintaining the greenhouse air at a relative humidity set p...
Conference Paper
Full-text available
Using Computational Fluid Dynamics (CFD), we investigated the spread of gases inside and around of a poultry house. A 3D CFD model takes account of the natural ventilation combined with heat and water vapour produced by the animals. In order to validate a 3D CFD model a cycle of production for experimental purposes located West of France during the...
Conference Paper
Full-text available
A 2D CFD model was developed to simulate interior climate of a poultry house. To validate the CFD model, an experiment was conducted in West of France during spring 2014. Two cases were evaluated: Case I and II at the early (19th day) and late (69th day) stage of production, respectively. For Case II, the CFD model evaluated three different densiti...
Article
Full-text available
Improvements to the living conditions in semi-enclosed spaces such as broiler houses can be achieved by better control of the heat and mass transport that occur in climate and air quality. This study shows that computer-aided modelling, and in particular computational fluid dynamics (CFD), can provide to researchers the ability to integrate the pri...
Article
Humidity and temperature are key factors in greenhouse climate management since they impact crop growth. For example, under high humidity and low temperatures, condensation may occur and lead to crop damage. In order to assess the condensation mechanism inside a closed greenhouse during the night, a closed monospan 100-m2 Venlo glasshouse was consi...
Conference Paper
Full-text available
Intensive production of broilers is seen as a promising way to efficiently operate livestock buildings. However, there are great concerns about the required optimal settings that accomplish the best living conditions for the animal. These living conditions strongly depend on the broiler house climate dynamics. The assessment of climate, incorporati...
Conference Paper
Full-text available
The operation of animal housing requires a comprehensive analysis of the interaction between the animal and its surroundings. Apart from good nutrition and management, comfortable living conditions, in particular, climate can also enhance animal productivity. The climate conditions become one of the main problems to solve once there are prevalent h...
Book
Energy Simulation (ES) is an interesting tool to explore and predict the evolution of the mean climatic parameters inside a greenhouse. A limitation of this tool is that it requires the ventilation rate and the heat transfer coefficients along the walls as inputs. This information may be obtained from Computational Fluid Dynamics (CFD). The present...
Article
Full-text available
Greenhouses play an important role in the field of agriculture, allowing the grower to have more control on the environmental factors that govern the behaviour of crops. The interactions of the environmental factors on the inside climate of a greenhouse are complex and involve a set of physical mechanisms that constitute challenges to modellers. To...
Article
Assessing the distribution of short wavelength radiation inside a greenhouse crop is of prime interest as absorbed radiation is one of the main factors governing the energy and water vapour transfers at plant level. The aim of this paper is to analyse the distribution of solar radiation inside an ornamental crop and to improve the crop submodel imp...
Article
Full-text available
The increase of fossil energy costs in the past years led producers to use more and more airtight greenhouses (air-inflated double-layer greenhouse) to reduce heat loss. Limiting air renewal however induces higher air moisture content and risks of condensation. Under such conditions, which may enhance fungal development (e.g., Botrytis), growing mo...
Data
Full-text available
Intensive production of broilers is seen as a promising way to efficiently operate livestock buildings. However, there are great concerns about the required optimal settings that accomplish the best living conditions for the animal. These living conditions strongly depend on the broiler house climate dynamics. The assessment of climate, incorporati...
Conference Paper
Humidity control is a key factor in greenhouse management as it impacts the growth of most greenhouse crops. Excessive humidity and the presence of droplets may enhance the development of fungal diseases or affect optical properties of the cover material. For that reason, growers have to adapt their climatic strategy in order to warranty an optimal...
Article
The aim of this study is to implement an unsteady 2D CFD model to predict the time-evolution of greenhouse temperature and humidity distributions all night long in winter, taking account of both radiative transfers and crop interactions with the inside climate. Beyond the classical conservation equations, specific radiativeand crop-submodels were a...
Article
The determination of the Convective Heat Coefficients (CHC) is a challenge to get a detailed knowledge of the microclimate of greenhouses in order for instance to improve energy management of these buildings. Computational Fluid Dynamics tools (CFD) have been developed to predict the distributed inside climate. However, most of the previous studies...
Article
Full-text available
The thermal behavior of the inside air of a closed Venlo glasshouse without plants was analysed under semi-arid climate conditions. The aim of the study was to investigate to what extent the characteristics of the greenhouse design and outside climatic conditions influence airflow and temperature patterns inside the greenhouse. For the purpose of t...
Article
The determination of the Convective Heat Coefficients (CHC) is a challenge to get a detailed knowledge of the microclimate of greenhouses in order for instance to improve energy management of these buildings. Computational Fluid Dynamics tools (CFD) have been developed to predict the distributed inside climate. However, most of the previous studies...
Article
Reducing water consumption in greenhouses is one of the main concerns for growers. This implies better knowledge of the transpiration process in order to adapt water inputs to plant needs. Several simple models have been developed to estimate transpiration. The Penman–Monteith (PM) model and the Direct Method (DM) model are two of the most widespre...
Article
Following the rise of energy costs and fuel scarcity, energy becomes today one of the main greenhouse crop production expenses. In this context, growers have to adapt their production system and climate management strategy in order to remain competitive, particularly at night when heat supply is often required and risk of condensation is enhanced....
Article
Numerical simulations of the microclimate inside a greenhouse canopy were validated. Experiments were conducted inside a 100 m(2) greenhouse compartment with a shading screen and potted Impatiens plants grown on benches. The greenhouse was equipped with a set of sensors, including a sonic and hot-bulb anemometers, thermocouples, air-humidity/temper...
Article
The crop activity inside a greenhouse is strongly affected by the local microclimatic conditions (radiation, temperature and humidity of air in particular). In order to reduce the consumption of energy and water, the control of these parameters is of prime interest. A better knowledge of the local climate may also help to formalize processes in CFD...
Article
Full-text available
The aim of this work is to analyze the thermal performance of a greenhouse exposed to semi-arid conditions by investigating experimentally the heat transfers occurring through the walls and ground. A closed unheated Venlo greenhouse without crop in the area of Batna (southern Mediterranean basin) was considered. The study focuses on the effects of...
Article
Full-text available
In this paper, we present the global set of elements required for the numerical simulation of wind effects on elementary bridge profiles, particularly possible aeroelastic instabilities. We also propose a possible methodology which is based on an efficient coupling algorithm, a finite-element solver for three-dimensional incompressible Navier-Stoke...
Article
Full-text available
Numerical simulations of the microclimate inside a greenhouse canopy were validated. Experiments were conducted inside a 100 m(2) greenhouse compartment with a shading screen and potted Impatiens plants grown on benches. The greenhouse was equipped with a set of sensors, including a sonic and hot-bulb anemometers, thermocouples, air-humidity/temper...
Chapter
Semi-arid regions are frequently subject to major temperature changes during a 24 h period, which may drastically affect greenhouse indoor climates. In order to improve energy management of these buildings, numerical tools have been developed to predict the evolution of the inside climatic conditions. However, most of the available models neither t...
Article
The aim of this work is to analyze the thermal performance of a greenhouse exposed to semi-arid conditions by investigating experimentally the heat transfers occurring through the walls and ground. A closed unheated Venlo greenhouse without crop in the area of Batna (southern Mediterranean basin) was considered. The study focuses on the effects of...
Article
Full-text available
Crop growth in greenhouses is strongly influenced by the local inside climate. In the present study, a model for predicting the thermal and water behaviour inside an unheated closed plastic tunnel greenhouse is presented. The energy balance method is applied to each element of the shelter: cover, indoor air and soil surface. Radiative transfers are...
Article
The crop activity strongly interacts with the climate inside a greenhouse. The crop exerts a mechanical strain onto the flow and exchanges heat and water vapour with the surrounding environment. Conversely, the outside climate conditions (wind, air temperature and radiation) also affect the metabolism of plants. Up to now, the mechanisms involved i...