Heating and Cooling Performance of Earth-Tube Heat Exchanger in a Mechanical Ventilated Farrowing House
Heating and Cooling Performance of Earth-Tube Heat Exchanger in a Mechanical Ventilated Farrowing House作者机构：Department Animal Sciences Georg-August-University Goettingen Division: Process Engineering Universitaetsstr. 7 Vechta D-49377 Germany
出 版 物：《Journal of Agricultural Science and Technology(A)》 (农业科学与技术（A）)
年 卷 期：2011年第1卷第2X期
页 面：187-193页
学科分类：0832[工学-食品科学与工程（可授工学、农学学位）] 08[工学] 082304[工学-载运工具运用工程] 080204[工学-车辆工程] 0802[工学-机械工程] 083203[工学-农产品加工及贮藏工程] 0823[工学-交通运输工程]
主 题：冷却空气 管式换热器 地球 加热 机械通风 分娩 性能 空气温度
摘 要：Earth tempering of stable air has attracted great attention as a sustainable air conditioning method in pig houses. At summer time air cooling of income air strongly reduces heat stress and required ventilation rate. At winter time heating costs can be reduced. The effect of air condition using geothermal energy was investigated in a farrowing house. Underneath the foundation of the farrowing house 88 non perforated ribbed tubes (diameter: 20 cm) were piped in a depth of 1.6-2.0 m. Over a period of 12 month following data were recorded at hourly intervals and analyzed: outside air temperature, as well as air temperature in the air supply duct and in the compartments. Incoming air (supply duct) was heated up to 20 °C during winter time and in summer time cooled by up to 15 °C compared to the outside air temperature. In contrast to the outside air diurnal variation, temperature fluctuations of the incoming air were reduced by 90%. Due to cooling of the incoming air at summer time the stable inside temperature could be limited to maximal 29 °C (maximum outside temperature was 35 °C). Earth-tube heat exchangers with non perforated ribbed tubes were very efficient for air conditioning in farrowing houses. They were a cost effective supplement for sustainable cooling and heating of farrowing houses.
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