Acute effects of the work environment on pulmonary functions of swine confinement workers

Posted in: Environment by admin on January 1, 1984 | No Comments

The Contributions of Livestock Manure to Profitability and to Self-Sufficiency in Plant Nutrients on Mixed Farms.

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Extraction of Energy from an Aerobic Farm Waste Lagoon

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Minimal labor and management resources had to be invested in the operation of the heat recovery system. If considering that the capital and running cost of the waste system is not included and that the first purpose of the waste management system is for manure treatment and odour control, the heat recovery system is cost effective by the money saved on energy costs. The pay-back period of the heat pump is around 3 to 4 years. As the operating cost of aeration treatment are superior to the heat recovery by the heat pump, improving the aerator efficiency would be more appropriate than improving the heat recovery system. The behavior of such system under very cold weather would need to be verified as the micro-organisms activity would be lower at low temperature and could probably not maintain temperature high enough to achieve a good treatment.

Performance of a Solar Collector/Storage Wall for Preheating Ventilation Air in a Swine Barn

Posted in: Energy by admin on January 1, 1983 | No Comments

Heat Exchangers for Swine Buildings

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Up to 90% of the heat lost from heated livestock buildings is lost in the ventilation exhaust air. There has recently been a great deal of interest in the recovery and reuse of this energy with heat exchangers designed specifically for livestock building applications. Heat exchangers provide several advantages to the livestock producer, however the heat recovered is not necessarily “free”. The purpose of this paper is to evaluate the use of heat exchangers on the farm and to help the livestock producer decide if he would benefit from and could justify one on his or her farm.

Swine Housing and Equipment Handbook

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This book was prepared by the Midwest Plan Service under the direction of agricultural engineers and consulting specialists. This book is a comprehensive look at housing and equipment for swine facilities. The heating, draft, ventilation and maintenance sections are of particular interest as they deal with energy issues.

Airborne bacteria, endotoxin and fungi in dust in poultry and swine confinement buildings

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The Efficiency of a Solar Concrete (Trombe) Wall in Providing Supplemental Heat

Posted in: Energy by admin on January 1, 1982 | No Comments

This paper examines the use of a Trombe-wall type solar wall for heating an existing farrowing barn at the PSC in Saskatoon, Sk. Data was obtained during January, February and March of 1982. The solar wall assisted heating 44% for the winter months of 1982. The system was able to warm the outside temperature. Average solar collection efficiency was 56%.

A Note on Energy Use in Housing Food Animals

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Professor DeShazer emphasized many important concepts relative to energetic efficiency in food animal production. These concepts included an overview of general energy flow in livestock systems, energetics of domestic animals as affected by environmental temperature and factors that affect heating requirements of animal shelters. These general principles are reiterated in this discussion of his paper. Slightly different aspects of each concept are presented. Practical considerations that are important in applying research results to farm environments are emphasized.

Methodology for Determining Seasonal Energy Usage and Energy Conservation in Animal Housing Systems

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Traditional methods for estimating energy usage have found form in the “degree day method”. The “bin” method lends itself to incorporating selected space temperatures and internal gains in a more encompassing manner. Manipulation of the bin method to incorporate variables such as space temperatures, internal gains, and ventilation rates is presented in this paper to provide a two-fold purpose. First, to provide an appropriate method to evaluate seasonal energy usage in livestock buildings in a simple, convenient manner using tabulated bin data. Second, to provide a technique to model livestock buildings for hourly computer simulation of energy usage.