METHODS FOR EVALUATION OF THE THERMAL ENVIRONMENT IN THE ANIMAL-OCCUPIED ZONE FOR WEANED PIGLETS

2005 ◽  
Vol 48 (6) ◽  
pp. 2323-2332 ◽  
Author(s):  
A. V. van Wagenberg ◽  
J. H. M. Metz ◽  
L. A. den Hartog
Keyword(s):  
Thermal Environment ◽  
Weaned Piglets ◽  
Occupied Zone

Evaluating Thermal Environments by Using an Air-Conditioning Energy-Saving Mechanism

2012 ◽  
Author(s):  
Nguyen Anh Tuan ◽  
K. D. Huang
Keyword(s):  
Energy Saving ◽  
Air Conditioning ◽  
Energy Use ◽  
Thermal Environment ◽  
Minimum Energy ◽  
Outlet Port ◽  
Thermal Environments ◽  
Environment Control ◽  
Port Opening ◽  
Occupied Zone

In a highly developed living, people are always looking for a comfortable indoor environment with minimum energy use. Individual air-conditioning system (IACS) can create an individual thermal environment control in a workroom which can contribute to save air-conditioning energy. In this study, we analyze the airflow circulation cell of the IACS with varied outlet port opening and outlet port position dimensions using the computational fluid dynamics (CFD) technique. We created an IACS, two workstations, lightings, and a cabinet in a 3-dimensional room. The fluid was assumed to be Newtonian, unsteady, and incompressible. A Bossinesq approximation was determined in order to consider the buoyancy effect. We examined the effects of the outlet port opening and outlet port position on airflow circulation establishing process. Air temperatures along the various midline of the occupied zone were predicted and compared for a range of outlet port opening and outlet port position by using non-dimensional form. We also showed the occupied zone temperature at various planes in the workroom. Results will indicate the suitable outlet port opening and outlet port position for maintaining individual satisfied occupants’ requirements and improving energy saving potential.

scholarly journals CONFORTO TÉRMICO E DESEMPENHO DE LEITÕES CRIADOS EM GAIOLAS ENRIQUECIDAS COM PISO DE RESÍDUOS DE EVA (ETILENO-ACETATO DE VINILA)

2019 ◽  
Vol 34 (2) ◽  
pp. 230-240 ◽  
Author(s):  
Silvia Noelly Ramos de Araújo ◽  
José Pinheiro Lopes Neto ◽  
José Wallace Barbosa do Nascimento ◽  
Fernanda Fernandes de Melo Lopes ◽  
Maria Luíza de Souza Rezende
Keyword(s):  
Thermal Comfort ◽  
Thermal Environment ◽  
Productive Performance ◽  
Weaned Piglets ◽  
Alternative Material ◽  
Globe Temperature ◽  
And Performance ◽  
Comfort Indices ◽  
Black Globe Temperature

CONFORTO TÉRMICO E DESEMPENHO DE LEITÕES CRIADOS EM GAIOLAS ENRIQUECIDAS COM PISO DE RESÍDUOS DE EVA (ETILENO-ACETATO DE VINILA)   SILVIA NOELLY RAMOS DE ARAÚJO1, JOSÉ PINHEIRO LOPES NETO2, JOSÉ WALLACE BARBOSA DO NASCIMENTO3, FERNANDA FERNANDES DE MELO LOPES4, MARIA LUIZA DE SOUZA REZENDE5   Engenharia Agrícola, Universidade Federal de Campina Grande, Rua Aprígio Veloso, 882 – Universitário, 58429-900, Campina Grande, Paraíba, Brasil, [email protected]; [email protected]; [email protected]; [email protected]; [email protected].   RESUMO: Objetivou-se analisar o conforto térmico de leitões na fase de creche, mantidos em instalações com piso de placas de resíduos EVA, utilizadas para reduzir a transferência de calor dos animais para a superfície de contato, utilizando-se 24 leitões desmamados, com idade média de 23 + 2 dias, distribuídos em 8 baias, utilizando-se dois tipos de pisos: tratamento 1- Placas de EVA + piso plástico vazado e o tratamento 2- piso plástico vazado. O delineamento experimental foi inteiramente casualizado (DIC) e a comparação entre as médias através do teste de Tukey (P<0,05). A caracterização do ambiente térmico foi realizada por meio do registro da temperatura do ar, umidade relativa, temperatura de globo negro, luminosidade e velocidade do vento. Para a análise do conforto térmico proporcionado pelos pisos utilizou-se os índices de conforto térmico (temperatura de globo negro e umidade e a carga térmica de radiação), o mapeamento térmico superficial (pisos e leitões) e o desempenho produtivo dos animais. Os resultados indicaram que, as placas sobre o piso mostraram ser eficiente na redução da transferência de calor sensível entre o piso-leitão, o que tornou o aquecimento mais eficaz para os animais.   Palavras-chaves: conforto térmico, creche suína, material alternativo, piso plástico.   THERMAL COMFORT AND PERFORMANCE OF PIGLETS CREATED IN ENRICHED CAGES WITH EVA WASTE FLOOR (VINYL ETHYLENE ACETATE)   ABSTRACT: The aim of this study was to analyze the thermal comfort of piglets in nursery phase, maintained in systems with EVA waste plates floor, used to reduce the animal heat transfer to the contact surface, using 24 weaned piglets, average age 23 + 2 days, distributed in 8 bays, using two types of floors: treatment 1: EVA plates + leaked plastic floor and treatment 2: leaked plastic floor. The experimental design was completely randomized (CRD) and the means were compared using Tukey's test (P<0.05). The characterization of the thermal environment was performed by recording the air temperature, relative humidity, black globe temperature, luminosity and wind speed. Thermal comfort indices (black globe temperature and humidity and thermal radiation load), thermal thermal mapping (floors and piglets) and the productive performance of animals were used to analyze the thermal comfort provided by the floors. The results indicated that the boards on the floor were shown to be efficient in reducing the transfer of sensible heat between the floor-piglet, which made heating more effective for the animals.   Keywords: thermal comfort, nursery, alternative material, plastic floor.

Airflow pattern and performance of wall confluent jets ventilation for heating in a typical office space

2019 ◽  
Vol 29 (1) ◽  
pp. 67-83
Author(s):  
Diyi Tan ◽  
Baizhan Li ◽  
Yong Cheng ◽  
Hong Liu ◽  
Jinhua Chen
Keyword(s):  
Air Temperature ◽  
Temperature Difference ◽  
Thermal Environment ◽  
Ambient Air ◽  
Air Velocity ◽  
Text Model ◽  
Jet Velocity ◽  
Ventilation Performance ◽  
Heating Mode ◽  
Occupied Zone

To investigate an air distribution system with the potential to provide a comfortable thermal environment and efficient ventilation performance in heating mode, this study compared the numerical results of the RNG k-[Formula: see text] model, realizable k-[Formula: see text] model and SST k-ω model with experimental data obtained from a typical office with wall confluent jets ventilation (WCJV) for heating. The SST k-ω model was chosen for numerical study of WCJV. The findings showed that the WCJV performed better than mixing ventilation (MV) in the heating mode because WCJV could entrain less ambient air and maintain the jets’ momentum and energy to reach the occupied zone. The effects of supply air temperature difference (in the range of 2.00°C to 7.79°C) and supply air velocity (in the range of 2.20 m/s to 8.50 m/s) on the jet velocity profiles and ventilation performance of WCJV were also quantified. The results showed that the jet velocity profile was more sensitive to the supply air velocity than to the supply air temperature difference. Accordingly, reducing the supply air velocity might result in poorer thermal environment and air quality in the occupied zone because the warm air jets cannot spread out over the floor area. The results can be helpful in understanding WCJV used for ventilation under heating mode.

scholarly journals Thermal Environment Assessment of Gas Stove Surroundings

2018 ◽  
Vol 26 (4) ◽  
pp. 26-31
Author(s):  
Anita Vörösné Leitner ◽  
László Kajtár
Keyword(s):  
Thermal Effects ◽  
Thermal Environment ◽  
Field Studies ◽  
Combustion Products ◽  
Indoor Temperature ◽  
Air Movement ◽  
Forced Air ◽  
Ventilation Method ◽  
Occupied Zone ◽  
Gas Stoves

Abstract Residential kitchens with gas stoves are unique spaces inside dwellings.Occupants directly exposed to the combustion products and thermal effects of the stove. Applying a general model with the knowledge of describing parameters, designer could taken thermal aspects also into consideration in order to provide a save, healthy and comfortable environment in residential kitchens and homes. The aim of this study to develop this model and a new ventilation method. Results of field studies shows disadvantageous effect of kitchen exhaust unit during the operation of oven. However turbulence intensity was decreased from 123% to 25% , indoor temperature was increased by 3,7K in the occupied zone due to the forced air movement. PMV index remained within the recommended intervals (between -1,0 and +1.9), therefore it could be applied to evaulate thermal environment aroun the residential gas stove. Unpleasent effect of draught is not expected.

scholarly journals Subzone Control of Air Distribution to Improve Thermal Comfort and Energy Efficiency

2019 ◽  
Vol 111 ◽  
pp. 02008
Author(s):  
Sheng Zhang ◽  
Yong Cheng ◽  
Xiaoliang Shao ◽  
Zhang Lin
Keyword(s):  
Energy Efficiency ◽  
Thermal Comfort ◽  
Conventional Method ◽  
Thermal Condition ◽  
Thermal Environment ◽  
Heat Removal ◽  
Air Distribution ◽  
Overall Performance ◽  
Thermal Preferences ◽  
Occupied Zone

The conventional method for air distribution (e.g., mixing ventilation and stratum ventilation) controls the averaged thermal condition in the occupied zone to satisfy the averaged thermal preference of a group of occupants. However, since the thermal environment cannot be absolutely uniform, the microclimates of occupants can be distinct from the averaged thermal condition of the occupied zone. Moreover, the thermal preferences of occupants are well recognized to be diversified beyond the averaged value. Thus, the conventional method is unable to ensure thermal comfort and risks energy wastage because of overcooling. The method proposed by this study divides the occupied zone into several subzones, and determines the supply air parameters to optimize the overall performance regarding thermal comfort and energy efficiency of the subzones using the multi-criteria decision-making technique. Thermal comfort is indicated by the thermal deviation of the achieved thermal conditions of the subzones from the respective thermal preferences, and energy efficiency is indicated by the heat removal efficiencies of the subzones. Case studies based on experiments of stratum ventilation have demonstrated the effectiveness of the method proposed. Results show that the method proposed achieves thermal comfort for each subzone, and improves the overall performance by 2.1% to 31.0%.

OPERANT CONTROL OF THE THERMAL ENVIRONMENT AND LEARNING TIME OF YOUNG CHICKS AND PIGLETS

1987 ◽  
Vol 67 (2) ◽  
pp. 343-347 ◽  
Author(s):  
W. D. MORRISON ◽  
I. McMILLAN ◽  
E. AMYOT
Keyword(s):  
Key Words ◽  
Thermal Environment ◽  
Learning Criterion ◽  
Weaned Piglets ◽  
Learning Time ◽  
Time Required ◽  
Young Chicks

Eight-day-old chicks and newly weaned piglets were used in 56 and 32 groups respectively, involving operant procedures. In each group, six chicks and six piglets were placed in a chamber adapted for the particular species and equipped with a microswitch whereby the animals could activate heat lamps. The time required for the animals to reach the criterion of learning to control the operation of the heat lamps varied from 1 h to 25 h with a mean of 7.38 h (SD 7.12 h) for the chicks, and from 1 h to 22 h with a mean of 4.4 h (SD 3.79 h) for the piglets. Failure to reach the learning criterion within 25 h occurred in five groups of chicks out of 56 and two groups of piglets out of 32. Seventy-five percent of the groups of chickens learned within 12 h while 84% of the groups of piglets learned within the first 6 h. Key words: Operant, thermoregulation, chicks, piglets, learning

Characterisation of the occupational thermal environment of operating rooms

2012 ◽  
Author(s):  
Alberto Miguel ◽  
Nelson Rodrigues ◽  
Senhorinha Teixeira ◽  
Jose Teixeira ◽  
Ricardo Oliveira
Keyword(s):  
Thermal Environment ◽  
Operating Rooms
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