Design-oriented modelling on cooling performance of the earth-air heat exchanger for livestock housing

TY - JOUR

T1 - Design-oriented modelling on cooling performance of the earth-air heat exchanger for livestock housing

AU - Wang, Xiaoshuai

AU - Bjerg, Bjarne Schmidt

AU - Zhang, Guoqiang

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Access to inexpensive cooling sources is a precondition for developing cost-effective methods to mitigate heat stress among farm animal under hot climate conditions. The earth-air heat exchanger (EAHE) is a promising energy-effective technique that can be used to reduce the cooling load of a livestock building in hot days. Several studies have been carried out to assess the feasibility of EAHE for tempering air in livestock buildings. However, no mathematical model serving for EAHE design for livestock buildings has been developed, in which the EAHE system is often operated continuously to keep animals comfortable and productive. This work firstly deduced a regression model for predicting the air temperature difference between an EAHE tube inlet and outlet (ΔTi-o) using response surface methodology (RSM) based on the data obtained from validated steady-state numerical simulations. Four key design and operation factors (tube diameter, tube length, air velocity, and the temperature difference between inlet air and the undisturbed soil) were incorporated into the model. Based on the regression model, a mathematical model for predicting the cooling capacity (CC) of an EAHE tube was obtained. Parametric analysis was conducted to reveal the effects of the four factors on both the ΔTi-o and the CC. The models on cooling performance allow the designers to optimize the EAHE configuration for cooling livestock buildings.

AB - Access to inexpensive cooling sources is a precondition for developing cost-effective methods to mitigate heat stress among farm animal under hot climate conditions. The earth-air heat exchanger (EAHE) is a promising energy-effective technique that can be used to reduce the cooling load of a livestock building in hot days. Several studies have been carried out to assess the feasibility of EAHE for tempering air in livestock buildings. However, no mathematical model serving for EAHE design for livestock buildings has been developed, in which the EAHE system is often operated continuously to keep animals comfortable and productive. This work firstly deduced a regression model for predicting the air temperature difference between an EAHE tube inlet and outlet (ΔTi-o) using response surface methodology (RSM) based on the data obtained from validated steady-state numerical simulations. Four key design and operation factors (tube diameter, tube length, air velocity, and the temperature difference between inlet air and the undisturbed soil) were incorporated into the model. Based on the regression model, a mathematical model for predicting the cooling capacity (CC) of an EAHE tube was obtained. Parametric analysis was conducted to reveal the effects of the four factors on both the ΔTi-o and the CC. The models on cooling performance allow the designers to optimize the EAHE configuration for cooling livestock buildings.

KW - Earth-air heat exchanger

KW - Livestock housing

KW - Mathematical model

KW - Numerical simulation

KW - Parametric analysis

U2 - 10.1016/j.compag.2018.07.006

DO - 10.1016/j.compag.2018.07.006

M3 - Journal article

AN - SCOPUS:85049482447

SN - 0168-1699

VL - 152

SP - 51

EP - 58

JO - Computers and Electronics in Agriculture

JF - Computers and Electronics in Agriculture

ER -