Relation between energy use and indoor thermal environment in animal husbandry: a case study (original) (raw)
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Energy Use for Climate Control of Animal Houses: The State of the Art in Europe
Energy Procedia, 2016
Animal rearing is done into houses where heating, cooling, ventilation and lighting are adopted to control the indoor climate, however there are not reference values for the energy performance of such enclosures. In this paper, a first analysis on the energy use for climate control of animal houses that can be found in the technical and scientific literature is done for broilers, hens and pig houses, deriving reference energy use values that may be used for the benchmarking of the performance of these buildings.
EUREKA: Physics and Engineering, 2021
Pig farming is a sector of animal husbandry, the development of which is great attention. The pork market occupies a large share in the trade in animal products. In the conditions of they do competition more efforts are made to improve the quality and reduce the cost of production. To achieve this goal, work is being done in several areas – development and expansion of the gene pool, improvement of the living environment in the premises for animal husbandry, reduction of energy costs. Along with the development of feeding technologies, it is necessary to create a suitable microclimate in the premises, in which the animals to realize their productive potential, which in turn is directly related to the use of heating and cooling systems. The design of these systems for both existing and new buildings is carried out according to generally accepted methodologies, which in turn require time for calculation and use of specialized software. The methodologies for determining the loads for h...
Energy Performance and Indoor Environmental Control of Animal Houses: A Modelling Tool
Energy Procedia, 2015
The energy-related products Directive (ErP) 2009/125/EC has set a new generation of equipment that are more energy efficient and reliable. In the case of climate control for livestock housing, a key role can be played by EC motors direct drive variable flow fans that can be used instead of traditional AC fans in applications like broiler or dairy houses. The energy consumptions of such fans strictly depend on the specific application and on the outdoor weather conditions, and there is therefore the need to forecast their energy performance by means of computational tools. In this work, we present a tool developed by the Authors and based on a dynamic model for the estimation of the global (electricity, natural gas, etc.) annual energy consumption of a system installed into an animal house. The calculation is based on a customization of the ISO 13790 Standard simplified hourly model for the energy performance assessment of broiler houses.
Dynamic model of the indoor climate inside livestock buildings: A case study for fattening pigs
2000
Indoor climate of livestock buildings is of importance for the well-being and health of animals and their production performance (daily weight gain, milk yield, etc.). By using a steady-state model for the sensible and latent heat fluxes and the CO 2 and odour mass flows, the indoor climate of mechanically ventilated livestock buildings can be calculated. These equations depend on the livestock (number of animals and how they are kept), the insulation of the building and the characteristics of the ventilation system (ventilation rate). Since the model can only be applied to livestock buildings whose ventilation systems are mechanically controlled (this is the case for a majority of pig fattening units), the calculations were done for a pig fattening unit with 1000 animal places. The model presented needs half-hour values of the outdoor parameters temperature and humidity, here collected for a two-year period, as input. The environment inside the livestock building is evaluated according to a comparison with recommended values for animals. Further, the duration of condensation of the inside surfaces is calculated. The sensitivity of the model is investigated by varying the livestock, the insulation and the ventilation system of the livestock building with the control unit.
Revista Brasileira de Engenharia de Biossistemas, 2009
Climate control systems are one alternative for minimizing losses due to high temperature and large thermal variations in swine production units. However, because of the possibility of increase the productions cost, the benefits of climate control systems should be assessed before they are implemented. This research aims to assess the efficiency of different swine growing and finishing facilities regarding the animal thermal comfort, and the use of electric energy. The treatments are the following: S1 -two old automatic started fans + constructively inappropriate, S2 -two new automatic started + constructively inappropriate fans, S3 -one old manual started fan + constructively inappropriate, S4 -no one acclimatization system + constructively appropriate. The variables used in comparing these constructions were dry-bulb temperature, relative humidity, enthalpy and the thermal control index (ITH), as well as the electric variables and electric energy efficiency indexes. The use of two new fans and a sprayer system, both automatically started, provided animals with better thermal comfort, than compared wit h old ones. The use of automatic climate control equipment improves thermal comfort conditions as well as the use of electric energy.
International journal of biometeorology, 2000
The indoor climate of livestock buildings is of importance for the well-being and health of animals and their production performance (daily weight gain, milk yield etc). By using a steady-state model for the sensible and latent heat fluxes and the CO 2 and odour mass flows, the indoor climate of mechanically ventilated livestock buildings can be calculated. These equations depend on the livestock (number of animals and how they are kept), the insulation of the building and the characteristics of the ventilation system (ventilation rate). Since the model can only be applied to animal houses where the ventilation systems are mechanically controlled (this is the case for a majority of finishing pig units), the calculations were done for an example of a finishing pig unit with 1000 animal places. The model presented used 30 min values of the outdoor parameters temperature and humidity, collected over a 2-year period, as input. The projected environment inside the livestock building was compared with recommended values. The duration of condensation on the inside surfaces was also calculated.
Study of Energy Saving Techniques in a Broiler Farm in Spain. Preliminary Results
The objective of this work is to compare the performance of a broiler house climate control system based on ventilation heat exchangers and ventilation regulation by psychometric chart, to a reference one, in terms of energy saving and gaseous emissions. Preliminary results seem to indicate a reduction of propane consumption in the building equipped with the energy saving techniques, both in mild and cold seasons. During the summer, this effect is reduced, especially considering that the electricity consumption increase may have to be compensated. The differences of temperature and pressure between inside and outside of the building have to be considered for the heat exchangers handling and for the evaluation of its economical benefit. Further analysis are required to complete the evaluation of the economical benefit of the heat exchangers, to characterize the isolated effect of the ventilation by psychometric chart and to complete the effect of these techniques on emissions and on ...
1998
The indoor climate of livestock buildings is of importance for the well-being and health of animals and their production performance (daily weight gain, milk yield etc). By using a steady-state model for the sensible and latent heat fluxes and the CO 2 and odour mass flows, the indoor climate of mechanically ventilated livestock buildings can be calculated. These equations depend on the livestock (number of animals and how they are kept), the insulation of the building and the characteristics of the ventilation system (ventilation rate). Since the model can only be applied to animal houses where the ventilation systems are mechanically controlled (this is the case for a majority of finishing pig units), the calculations were done for an example of a finishing pig unit with 1000 animal places. The model presented used 30 min values of the outdoor parameters temperature and humidity, collected over a 2-year period, as input. The projected environment inside the livestock building was compared with recommended values. The duration of condensation on the inside surfaces was also calculated.
Biosystems Engineering
In large livestock houses, controlling the internal environmental condition is a key factor for enhancing livestock productivity. The basis of thermal comfort, contaminants, and ventilation efficiency is the internal air flow, which can be controlled by the ventilation system. Field experimentation is a challenging method for analysing air flows due to limited number of measurement points, cost, unstable weather conditions, and experimental errors. Alternatively, computational fluid dynamics (CFD) have been extensively used to overcome the limitations of field experiments by means of their ability to artificially control experimental conditions and the ease with which structural configurations are modified. Most of the previous CFD simulations have regarded livestock structures as twodimensional or simplified three-dimensional domains and complicated configurations that include animals have been ignored in simulation models. However, the presence of animals in commercial livestock buildings can significantly influence air flow patterns and internal environmental conditions. In this study, a full-scale commercial pig house was modelled to investigate the ventilation problems during the cold season. The simulation of pigs, and specific configurations of the ventilation system, was considered to improve the reliability of the CFD model. The CFD computed air temperature showed a À4.4% error compared to the field experimental data and this model was used to enhance the internal environmental conditions in the existing pig house by changing ventilation designs by sealing the entrances and reducing the size of inlet area, resulting in 24% improved thermal uniformity.