University of Campinas, UNICAMP, School of Agricultural Engineering, Avda. Cândido Rondon 501, Campinas, 13083875, Brazil.
Int J Biometeorol. 2018 May;62(5):773-781. doi: 10.1007/s00484-017-1479-x. Epub 2017 Nov 28.
The use of enhanced technologies of temperature control can improve the thermal conditions in environments of livestock facilities. The objective of this study was to evaluate the spatial distribution of the thermal environment variables in a pig nursery with a heating system with two temperature control technologies based on the geostatistical analysis. The following systems were evaluated: overhead electrical resistance with Proportional, Integral, and Derivative (PID) controller and overhead electrical resistance with a thermostat. We evaluated the climatic variables: dry bulb temperature (Tbs), air relative humidity (RH), temperature and humidity index (THI), and enthalpy in the winter, at 7:00, 12:00, and 18:00 h. The spatial distribution of these variables was mapped by kriging. The results showed that the resistance heating system with PID controllers improved the thermal comfort conditions in the pig nursery in the coldest hours, maintaining the spatial distribution of the air temperature more homogeneous in the pen. During the hottest weather, neither system provided comfort.
利用增强的温度控制技术可以改善家畜设施环境的热条件。本研究的目的是通过地统计学分析评估具有两种基于比例-积分-微分（PID）控制器的 overhead 电阻器和恒温器的加热系统的猪舍热环境变量的空间分布。评估了以下系统：干球温度（Tbs）、空气相对湿度（RH）、温度和湿度指数（THI）以及冬季 7:00、12:00 和 18:00 时的焓。这些变量的空间分布通过克里金法进行了映射。结果表明，带有 PID 控制器的电阻加热系统在最冷的几个小时内改善了猪舍的热舒适度，使猪舍内的空气温度空间分布更加均匀。在最热的天气下，两个系统都没有提供舒适感。
