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Cooling performance of earth-to-air heat exchangers applied to a poultry barn in semi-desert areas of south Iraq

International Journal of Agricultural and Biological Engineering 2018年第3期11卷 47-53页

作者： Wasseem Morshed lorenzo leso Leonardo Conti Giuseppe Rossi Stefano Simonini Matteo Barbari Department of Agricultural Food and Forestry SystemsUniversity of FirenzeVia San Bonaventura13.50145 FirenzeItaly

Earth-to-air heat exchangers(EAHE)can reduce the energy consumption required for heating and cooling of *** composition and the thermal characteristics of the soil influence the heat exchange capacity,and the soil moisture can furthermore affect thermal performance of *** aim of this study was to compare the thermal performance of EAHE in dry and artificially wetted *** were carried out in the Basra Province(Iraq),in a semi-desert *** experimental EAHE were built in a poultry barn and tested from June 2013 to September *** pipe exchangers were buried at 2 m *** heat exchanger operated in dry soil(DE),while the other one operated in artificially wetted soil(WE).In the WE system,a drip tubing placed 10 cm above the air pipe wetted the soil around the *** temperatures at the inlet and at the outlet of both the exchangers as well as soil temperature at 2 m deep were continuously *** experimental results confirmed that wetting the soil around EAHE improves the general heat exchange *** coefficient of cooling performance(COP)of the earth-to-air heat exchangers system was evaluated on the basis of the ratio between the heat removed from the air or added to the air and the energy *** the day,with an average COP of 6.41,the WE system cooled the air more than the DE system,which reported a value of *** average,in the hottest hours of the day,the outlet temperature of the WE was 37.35℃ while in the DE it was 38.91℃.Moreover,during the nighttime,the WE system warmed the air more than the DE system.

关键词： Earth-to-air heat exchangers thermal performance cooling artificially wetted soil poultry barn heat stress

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Influence of Cooling Systems on the Behaviour of Dairy Cows Housed in Cubicle Barn

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Journal of Agricultural Science and Technology(A) 2012年第1期2卷 40-49页

作者： Matteo Barbari lorenzo leso Giuseppe Rossi Alberto Scaramelli Stefano Simonini Department of Agricultural and Forest Economics Engineering Sciences and Technologies University of Firenze Firenze 50145 Italy

The aim of this paper is to collect information about dairy cow"s behaviour connected to different environmental conditions. During summer 2009 and winter 2010 experimental trials were arranged to verify the behaviour of dairy cows in a farm located in Po Plain (Italy). The barn was provided with an air-water cooling system, based on the use of fans and sprinklers placed only in the feeding alley. Two different trials were carried out. The first experiment was targeted on verifying the use of the cubicles by the cows in relation to the availability of the cooling system only in feeding area. The second trial aimed at testing the effectiveness of zone cooling systems placed in the front of cubicles. For this purpose three cubicles in the barn were provided with cooling systems, based on the input of high velocity conditioned air streams. The results clearly remark that the behaviour of the animals is greatly influenced by the environmental conditions. With high temperatures the use of the cubicles is deeply reduced and the animals prefer to stay in feeding area, thus benefiting from the cooling effect of water sprinkled by the showers and of the air streams created by the fans. With air temperatures increasing from 21 °C to 33 °C the cows reduce the staying in the cubicles, which gets down from 54% to 32% (r2 = 0.2608). As regards the efficacy of zone cooling system in the cubicles, the results are not particularly encouraging. The cows continue to use the cubicles without changing the behaviour in relation to the presence of conditioned air flow.

关键词：冷却系统奶牛行为谷仓空调冷却水系统冷却效果冷气流试验

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