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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| Format: | Monograph |
| Language: | English |
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Universiti Sains Malaysia
2003
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| Online Access: | http://eprints.usm.my/57056/1/Simulation%20Of%20Total%20Heat%20Loss%20From%20Wet%20Skin%20Surface%20Of%20Dairy%20Cattles_Chong%20Yian%20Sia.pdf |
| _version_ | 1797013776384393216 |
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| author | Chong, Yian Sia |
| author_facet | Chong, Yian Sia |
| author_sort | Chong, Yian Sia |
| collection | USM |
| 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. |
| first_indexed | 2024-03-06T16:06:51Z |
| format | Monograph |
| id | usm.eprints-57056 |
| institution | Universiti Sains Malaysia |
| language | English |
| last_indexed | 2024-03-06T16:06:51Z |
| publishDate | 2003 |
| publisher | Universiti Sains Malaysia |
| record_format | dspace |
| spelling | usm.eprints-570562023-02-27T09:52:47Z 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) |
| spellingShingle | T Technology TJ Mechanical engineering and machinery Chong, Yian Sia Simulation Of Total Heat Loss From Wet Skin Surface Of Dairy Cattles |
| title | 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_short | 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 |
| topic | T Technology TJ Mechanical engineering and machinery |
| url | http://eprints.usm.my/57056/1/Simulation%20Of%20Total%20Heat%20Loss%20From%20Wet%20Skin%20Surface%20Of%20Dairy%20Cattles_Chong%20Yian%20Sia.pdf |
| work_keys_str_mv | AT chongyiansia simulationoftotalheatlossfromwetskinsurfaceofdairycattles |