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Numerical Modelling of Air Temperature and Velocity in a Forced Ventilation Piggery

Journal of Thermal Science 2000年第3期9卷 211-216页

作者： ruth mossad (Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, QLD 4350, Australia ) Faculty of Engineering and Surveying University of Southern Queensland Toowoomba Australia

Pigs are subjected to intensive environment control and management for higher productivity due to their sensitivity to climatic variation, which affects their growth. The aim of the current work is to numerically model the air speed and temperature in a forced ventilation piggery to achieve optimum environmental control. This work can also help to identify problems in the design of piggeries and offer suggestions for improvements. A steady two-dimensional numerical model including the effect of buoyancy, turbulence and heat generated by the pigs was solved using the computational fluid dynamics software Fluent, using the integral volume method. Air speed and temperature inside the piggery and at the pigs level were predicted for three different locations of ventilation opening, inlet velocities in the range (0.3 - 7 m/s), insulation or no insulation in the external walls, and for 5 ℃ and 32℃ ambient temperatures.

关键词： computational fluid dynamics piggery design forced ventilation numerical modelling.

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Investigating Two Configurations of a Heat Exchanger in an Indirect Heating Integrated Collector Storage Solar Water Heating System

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Journal of Energy and Power Engineering 2013年第1期7卷 66-73页

作者： ruth mossad Marwaan AL-Khaffajy Faculty of Engineering and Surveying University of Southern Queensland Toowoomba 4350 Australia

Due to the environmental impact of energy usage and increased price of fusel fuel, consumers need to be encouraged to use renewable energy sources. The IHICSSWHS （indirect heating integrated collector storage solar water heater system） is one of the most economical systems. It incorporates the collection of a solar energy component and a hot water storage component in one unit. The objective of this study was to investigate ways to enhance the thermal performance of the system. Two configurations of the system were studied： system with double row HX （heat exchanger） and tube length of 16.2 m, and system with single row HX and tube length of 8.1 m and 10.8 m. The service water tube inside diameter was also varied to 10.7 mm and 17.1 mm The steady state continuity, momentum and energy equations were numerically solved, using FLUENT software. A standard k-w turbulent model and surface-to-surface radiation model were used. The result showed that the system of 10.8 m tube length and single row HX provided higher outlet temperature than the system of 16.2 m and double row HX. Therefore, a significant reduction in cost and power usage can be achieved by using a single row HX.

关键词： Heat exchanger FLUENT solar collector k-co turbulent model.

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