A two-node mechanistic thermophysiological model for pigs reared in hot climates: Part 2: Model performance assessments

TY - JOUR

T1 - A two-node mechanistic thermophysiological model for pigs reared in hot climates

T2 - Part 2: Model performance assessments

AU - Huang, Tao

AU - Rong, Li

AU - Zhang, Guoqiang

AU - Brandt, Pia

AU - Bjerg, Bjarne Schmidt

AU - Pedersen, Poul

AU - Granath, Simon W.L.

PY - 2021/12

Y1 - 2021/12

N2 - The performance of the mechanistic two-node thermophysiological model was assessed using the experimental data with respect to gestating sows and fattening pigs. The relation between the convective heat transfer coefficient and local airspeed was derived from CFD simulation. The improvement brought by the newly proposed active module over the selected available models was analysed and discussed. Generally, the proposed two-node model with novel active modules for pulmonary ventilation rate (related to panting) and vasodilatation could predict rectal and skin temperatures for fattening pigs and gestating sows with an error of 0.88% and 3.96%, and 0.42% and 1.27% respectively. Employing existing relationships for pulmonary ventilation rate and vasodilatation resulted overestimations on the skin and rectal temperature. Additionally, the convective heat transfer coefficient should be developed based on the field conditions when the flow pattern is not similar to that under which the existing models were developed. The mean radiant temperature should be input with a decent level of accuracy when a high level of accuracy of prediction was necessary. The proposed model is reliable and robust when predicting the pig thermal status under various climate conditions and it is expected to be applied when operating the technical approaches to mitigate the heat stress.

AB - The performance of the mechanistic two-node thermophysiological model was assessed using the experimental data with respect to gestating sows and fattening pigs. The relation between the convective heat transfer coefficient and local airspeed was derived from CFD simulation. The improvement brought by the newly proposed active module over the selected available models was analysed and discussed. Generally, the proposed two-node model with novel active modules for pulmonary ventilation rate (related to panting) and vasodilatation could predict rectal and skin temperatures for fattening pigs and gestating sows with an error of 0.88% and 3.96%, and 0.42% and 1.27% respectively. Employing existing relationships for pulmonary ventilation rate and vasodilatation resulted overestimations on the skin and rectal temperature. Additionally, the convective heat transfer coefficient should be developed based on the field conditions when the flow pattern is not similar to that under which the existing models were developed. The mean radiant temperature should be input with a decent level of accuracy when a high level of accuracy of prediction was necessary. The proposed model is reliable and robust when predicting the pig thermal status under various climate conditions and it is expected to be applied when operating the technical approaches to mitigate the heat stress.

KW - Convective heat transfer coefficient

KW - Mechanistic model

KW - Pig thermoregulation

KW - Pulmonary ventilation rate

KW - Vasodilatation

UR - http://www.scopus.com/inward/record.url?scp=85114701172&partnerID=8YFLogxK

U2 - 10.1016/j.biosystemseng.2021.08.021

DO - 10.1016/j.biosystemseng.2021.08.021

M3 - Journal article

SN - 1537-5110

VL - 212

SP - 318

EP - 335

JO - Biosystems Engineering

JF - Biosystems Engineering

ER -