Modeling and Assessing Heat Transfer of Piglet Microclimates
| Autor: | Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
heat mat
integumentary system pre-weaning heat lamp Agriculture (General) animal diseases Infrared lamp Airspeed Microclimate Pharmaceutical Science swine Engineering (General). Civil engineering (General) Thermal conduction Atmospheric sciences S1-972 Complementary and alternative medicine Creep Heat transfer Thermal Environmental science Pharmacology (medical) TA1-2040 Mean radiant temperature environment |
| Zdroj: | AgriEngineering Volume 3 Issue 4 Pages 48-782 AgriEngineering, Vol 3, Iss 48, Pp 768-782 (2021) |
| ISSN: | 2624-7402 |
| Popis: | High piglet pre-weaning mortality rates can be attributed to poor creep area microclimate resulting in negative productivity, welfare, and economic consequences. A piglet mechanistic steady-state thermal balance model was developed using previous models and expanded to assess (a) thermal interactions of multiple pigs and (b) conduction heat transfer. The piglet Effective Environment Temperature (EET) equation was also modified to incorporate piglet age (day 0 to 30) and a conduction heat transfer term. Model parameters were validated with empirical data consisting of the thermal component (dry-bulb temperature, Tdb mean radiant temperature, TMR airspeed, U mat underside temperature, Tm) of the microclimate and dimension data of the piglets (i.e., body weight, length, height, width, and calculated surface area). Model results demonstrate that the common microclimate supplemental heat sources (heat mats and heat lamps HL) can meet the needs of the piglets. The new EET was more consistent for a novel semi-enclosed heated microclimate (SEHM) in comparison to the HL. This demonstrates the benefit of precision technologies over manually adjusted supplemental heat sources. The experimental data and model results suggest further development of an ideal thermal index for piglet microclimates needs to account for variations of piglet health and body condition to be more applicable in industry. |
| Databáze: | OpenAIRE |
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