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Ingeniería agrícola y biosistemas
versão On-line ISSN 2007-4026versão impressa ISSN 2007-3925
Resumo
ROJANO, Fernando; CHOI, Christopher Y.; ORTIZ, Xavier A. e COLLIER, Robert J.. Development of a water pipe network serving as a conductive cooling system applied to dairy farms. Ing. agric. biosist. [online]. 2019, vol.11, n.2, pp.161-179. Epub 24-Ago-2020. ISSN 2007-4026. https://doi.org/10.5154/r.inagbi.2018.06.012.
Introduction:
In desert climates, high temperatures can cause heat stress on dairy farms. A viable alternative to this problem is to develop a network of water pipes connected to heat exchangers (HEs) that operate as a conductive cooling system.
Objective:
To propose a water supply system connected to a series of HEs, installed under bedding in a dairy barn freestall system, and analyze heat transfer along a large-scale water pipe network.
Methodology:
The EPANET water quality module was used to design the system. Temperature predictions were validated with experimental data from a network of four HE pipes installed under the bedding. A network was then designed to supply water to 1 000 HEs in order to calculate the efficiency of the system for a real dairy farm.
Results:
Insulations with values of 0.095 and 0.0475 W·m-1·°C-1 increased the cooling capacity of water-carrying pipes by 7 and 12 %, respectively. Increasing the flow rates from 1 to 7 L·min-1 increased the cooling capacity; however, the cooling efficiency decreased by at least 12 %.
Study limitations:
A validation was performed on a section of the pipe network and a simulation for the entire network.
Originality:
EPANET was implemented for a mass and heat balance in a pipe network supplying water to HEs.
Conclusion:
The conductive cooling system is viable in areas with a desert climate and its efficiency depends on the level of thermal insulation and flow in the pipe network.
Palavras-chave : EPANET; heat exchangers; hydraulics; heat transfer.