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Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles

In hot and humid environments, cows suffer from several heat stress that causes reduction in milk production and breeding inefficiencies. Generally, drops in milk yield of 20% to 30% following hot, muggy stretches are not uncommon in high producing herds without supplemental cooling. Therefore...

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Main Author: Chong, Yian Sia
Format: Monograph
Language:English
Published: Universiti Sains Malaysia 2003
Subjects:
T Technology
TJ Mechanical engineering and machinery
Online Access:http://eprints.usm.my/57056/1/Simulation%20Of%20Total%20Heat%20Loss%20From%20Wet%20Skin%20Surface%20Of%20Dairy%20Cattles_Chong%20Yian%20Sia.pdf
http://eprints.usm.my/57056/
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spelling my.usm.eprints.57056 http://eprints.usm.my/57056/ Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles Chong, Yian Sia T Technology TJ Mechanical engineering and machinery In hot and humid environments, cows suffer from several heat stress that causes reduction in milk production and breeding inefficiencies. Generally, drops in milk yield of 20% to 30% following hot, muggy stretches are not uncommon in high producing herds without supplemental cooling. Therefore, the main purpose of this study is to develop a simulation model that simultaneously calculates heat and mass transfer from a wetted skin surface and fur layer of a cow. In addition, respiration and urine heat losses are also included in the model. The model predicts evaporative, convective, radiant, respiration and urine heat losses with respect to the changes of levels of skin wetness (25, 50 and 75%), air velocity (0.5, 1.0, 2.0 m/s), relative air humidity (20, 40, 80%), ambient air temperature (30, 35, 380C), breathing rate (40, 60, 80 breaths/min) and volume of urine discharged (0.5, 1.0, 1.5 l/h). In the model, fur layer (hair coat) properties such as fur thickness and hair density assumed are that of summer condition. This prediction is done through the numerical solution by using the commercial Matlab software with version 6.5. This project discussed in detail about the effect of the five parameters or factors (levels of skin wetness, air velocity, relative air humidity, ambient air temperature, breathing rate and volume of urine discharged) on the types of heat losses as mentioned above based on the predicted values obtained. Graphs and tables of results are generated to show the relationship between the heat losses and each parameter. Besides that, the suggestions and recommendation for the future work are also included in the end of the thesis. Universiti Sains Malaysia 2003-03-01 Monograph NonPeerReviewed application/pdf en http://eprints.usm.my/57056/1/Simulation%20Of%20Total%20Heat%20Loss%20From%20Wet%20Skin%20Surface%20Of%20Dairy%20Cattles_Chong%20Yian%20Sia.pdf Chong, Yian Sia (2003) Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles. Project Report. Universiti Sains Malaysia, Pusat Pengajian Kejuruteraan Mekanikal. (Submitted)
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic T Technology
TJ Mechanical engineering and machinery
spellingShingle T Technology
TJ Mechanical engineering and machinery
Chong, Yian Sia
Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles
description In hot and humid environments, cows suffer from several heat stress that causes reduction in milk production and breeding inefficiencies. Generally, drops in milk yield of 20% to 30% following hot, muggy stretches are not uncommon in high producing herds without supplemental cooling. Therefore, the main purpose of this study is to develop a simulation model that simultaneously calculates heat and mass transfer from a wetted skin surface and fur layer of a cow. In addition, respiration and urine heat losses are also included in the model. The model predicts evaporative, convective, radiant, respiration and urine heat losses with respect to the changes of levels of skin wetness (25, 50 and 75%), air velocity (0.5, 1.0, 2.0 m/s), relative air humidity (20, 40, 80%), ambient air temperature (30, 35, 380C), breathing rate (40, 60, 80 breaths/min) and volume of urine discharged (0.5, 1.0, 1.5 l/h). In the model, fur layer (hair coat) properties such as fur thickness and hair density assumed are that of summer condition. This prediction is done through the numerical solution by using the commercial Matlab software with version 6.5. This project discussed in detail about the effect of the five parameters or factors (levels of skin wetness, air velocity, relative air humidity, ambient air temperature, breathing rate and volume of urine discharged) on the types of heat losses as mentioned above based on the predicted values obtained. Graphs and tables of results are generated to show the relationship between the heat losses and each parameter. Besides that, the suggestions and recommendation for the future work are also included in the end of the thesis.
format Monograph
author Chong, Yian Sia
author_facet Chong, Yian Sia
author_sort Chong, Yian Sia
title Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles
title_short Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles
title_full Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles
title_fullStr Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles
title_full_unstemmed Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles
title_sort simulation of total heat loss from wet skin surface of dairy cattles
publisher Universiti Sains Malaysia
publishDate 2003
url http://eprints.usm.my/57056/1/Simulation%20Of%20Total%20Heat%20Loss%20From%20Wet%20Skin%20Surface%20Of%20Dairy%20Cattles_Chong%20Yian%20Sia.pdf
http://eprints.usm.my/57056/
_version_ 1759690256725049344
score 13.211869

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