Development and validation of a data logger for thermal characterization in laying hen facilities

Letícia C Da S R Freitas,Richard S Gates,Matteo Barbari,João V Toledo,Ilda De F F Tinôco,Márcia G L Cândido

doi:10.1590/1807-1929/agriambi.v23n10p787-793

Abstract

ABSTRACT The environmental monitoring in animal facilities that includes collected data storage in a robust, practical and feasible way is a constant challenge. The aim of this study was to develop a reliable data logger for monitoring the air temperature and air relative humidity of aviaries and to assess the adequacy of the design using commercially available reference standard instruments. The experimental data logger was installed together with a commercial data logger, a mercury thermometer and a calibrated Vaisala HMP110 air relative humidity probe in a meteorological shelter. Linear regression analysis was performed with the collected air temperature and air relative humidity to develop calibration equations. The Nash-Sutcliffe Index and the relative error were calculated to validate the experimental data logger. The air temperature and the air relative humidity calibration equations presented Nash-Sutcliffe of 0.993 and -0.281 for the commercial data logger, and 0.913 and 0.932 for the experimental data. The mean relative error of the air temperature readings was 3 and 1% and for air relative humidity 5 and 20%, for the experimental and commercial logger, respectively. The experimental data logger reliably stored all collected data without error to the micro-SD card. The experimental data logger can be considered low-cost and sufficiently accurate for monitoring air temperature and air relative humidity in aviaries, presenting field performance very close to the commercial data logger for air temperature measurement, and better performance than the commercial data logger for the measurement of air relative humidity.

Highlights

The continuous monitoring of the thermal environment throughout the production cycle is necessary to provide ideal environmental conditions for animals in real time while balancing other inputs such as energy and feed
The air temperature and air relative humidity measured used in the regression analysis ranged from 9.25 to 26.00 °C and 37 to 73%, respectively
The intercept and slope coefficients of the commercial data logger air temperature regression were not significant (p > 0.05), which indicates that the data of the air temperature values measured by the commercial data logger are statistically the same as those measured by the mercury thermometer under consideration as a reference standard

Summary

Introduction

The continuous monitoring of the thermal environment throughout the production cycle is necessary to provide ideal environmental conditions for animals in real time while balancing other inputs such as energy and feed. Husain et al (2016) and Ünsal et al (2016) developed a low-cost, portable and manageable device to monitor air quality in urban settings. In the international poultry industry, studies related to the automation of the real-time environmental monitoring of the facilities are being carried out with the aim of optimizing environmental control (Li et al, 2015; Hongqian et al, 2016; Ji et al, 2016). For the Brazilian poultry industry, automated environmental monitoring in a practical and operable way is still a challenge to be overcome

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Conclusion