Long axis heat distribution in a tunnel-ventilated broiler house equipped with an evaporative pad cooling system

2009 ◽  
Vol 49 (12) ◽  
pp. 1125 ◽  
Author(s):  
M. Dağtekin ◽  
C. Karaca ◽  
Y. Yildiz
Keyword(s):  
High Temperatures ◽  
Air Temperature ◽  
Egg Production ◽  
Cooling System ◽  
Heat Distribution ◽  
Exit Point ◽  
Cooling Efficiency ◽  
Cooling Systems ◽  
Southern Turkey ◽  
Broiler House

Chicken meat and egg production in the Çukurova region of Southern Turkey shows enormous potential for growth. However, high temperatures in summer pose serious difficulties for these types of production. Evaporative pad cooling systems have been used to minimise rises in temperature and are commonly used in poultry houses in this region. The change of air temperature from the entry point to the system through the pads, to the exit point of the broiler house was investigated in this study. Experiments were carried out in a tunnel-ventilated broiler house in the Çukurova region. The broiler house has the capacity to house 15 000 chicks with a floor area of 70 by 12 m. In this experiment, the broiler house incorporated 15-cm-thick cellulose-based pads. Results obtained in August–September 2007 revealed a cooling efficiency of 69.35%, a 5.19°C decrease from the outside air temperature after passing through the pads, and a 1.52°C increase in air temperature at the exit point, which was located at the end of the broiler house.

scholarly journals Efficiency of cooling systems in broiler houses during hot days

2021 ◽  
Vol 51 (8) ◽  
Author(s):  
Maurício Portella dos Santos ◽  
Matheus Deniz ◽  
Karolini Tenffen de Sousa ◽  
Daniela Regina Klein ◽  
Tatiane Branco ◽  
...  
Keyword(s):  
Mechanical Ventilation ◽  
Spatial Distribution ◽  
Environmental Variables ◽  
Cooling System ◽  
Ventilation System ◽  
Cooling Efficiency ◽  
Cooling Systems ◽  
Hot Days ◽  
Evaporative Cooling System ◽  
Broiler House

ABSTRACT: This study evaluated: (1) the vulnerability of broiler houses with different cooling systems, and (2) the spatial distribution of environmental variables during hot days. Four potentially vulnerable commercial broiler houses in southern Brazil were selected according to the following parameters: absence or presence of different cooling systems, broilers older than 28 days, and outside air dry-bulb temperature over 30°C. Broiler house vulnerability was classified according to the cooling and mechanical ventilation system: cellulose pad cooling (CPC), sprinkling (SPK), fogging (FOG), and mechanical ventilation without evaporative cooling system (VTL). The air dry-bulb temperature (Tdb, °C) and relative humidity (RH, %) were recorded every 10 min. For each broiler house, we evaluated: (1) relative cooling efficiency (RCE) and (2) inside spatial distribution of microclimate variables using a geostatistical technique. The CPC and SPK did not differ (P<0.05) in RCE (81.6% and 80.7%, respectively), but both differed from FOG (23.8%) and VLT (1.87%) systems. The highest variations in indoor Tdb were recorded in the FOG (7 °C), followed by the SPK (4 °C) and CPC (3 °C). In the CPC, there was an increase in RH from the middle to the end of the broiler house near the exhaust fans. In conclusion, the relative cooling efficiency and the inside spatial distributions of environmental variables in the broiler houses were influenced by the existing cooling system.

scholarly journals Cooling of a Processor With the Use of a Heat Pump

2018 ◽  
Vol 28 (1) ◽  
pp. 16-25
Author(s):  
Zygmunt Lipnicki ◽  
Hanna Lechów ◽  
Katarzyna Pantoł
Keyword(s):  
Theoretical Analysis ◽  
Heat Pump ◽  
External Surface ◽  
Cooling System ◽  
Heat Distribution ◽  
Surface Cooling ◽  
Cooling Systems ◽  
Model Calculations ◽  
Systems Model ◽  
Liquid Evaporation

Abstract In this paper the problem of cooling a component, in the interior of which heat is generated due to its work, was solved analytically. the problem of cooling of a processor with the use of a heat pump was solved based on a earlier theoretical analysis of authors of external surface cooling of the cooled component by using the phenomenon of liquid evaporation. Cases of stationary and non-stationary cooling were solved as well. The authors of the work created a simplified non-stationary analytical model describing the phenomenon, thanks to which heat distribution within the component, contact temperature between the component and liquid layer, and the evaporating substance layer thickness in relation to time, were determined. Numerical calculations were performed and appropriate charts were drawn. The resulting earlier analytical solutions allowed conclusions to be drawn, which might be of help to electronics engineers when designing similar cooling systems. Model calculations for a cooling system using a compressor heat pump as an effective method of cooling were performed.

scholarly journals DESEMPENHO DE UM SISTEMA DE RESFRIAMENTO EVAPORATIVO DO AR EM CASA-DE-VEGETAÇÃO

Irriga ◽  
2010 ◽  
Vol 15 (2) ◽  
pp. 140-150
Author(s):  
Antonio José Steidle Neto ◽  
SÉRGIO ZOLNIER
Keyword(s):  
Vapor Pressure ◽  
Air Temperature ◽  
Vapor Pressure Deficit ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Climatic Conditions ◽  
Air Cooling ◽  
Cooling Efficiency ◽  
Growing Period ◽  
Air Cooling System

Este trabalho foi conduzido com o objetivo de analisar o desempenho de um sistema de resfriamento evaporativo do ar (tipo painel-exaustor) em casa-de-vegetação, ao longo do período diurno em dias com condições climáticas distintas. Foram realizadas medições de temperatura e umidade relativa do ar no interior e exterior de uma casa-de-vegetação durante o período de crescimento e desenvolvimento de tomateiros cultivados em substrato de areia. Verificou-se que as eficiências médias diárias de resfriamento evaporativo do ar variaram entre 74% e 81%. Os decréscimos máximos na temperatura do ar, imediatamente após a sua passagem pelo painel de celulose, foram de 8,2ºC e 11,4ºC. Observou-se ainda que, a eficiência de resfriamento do ar foi sensivelmente melhorada quando o déficit de pressão de vapor d'água do ar externo foi superior a 1,8 kPa.   UNITERMOS: déficit de pressão de vapor d'água do ar, temperatura do ar, eficiência de resfriamento evaporativo.     STEIDLE NETO, A. J.; ZOLNIER, S. EVAPORATIVE AIR COOLING SYSTEM PERFORMANCE IN A GREENHOUSE     2 ABSTRACT   This work aimed to analyze the performance of an evaporative air cooling system (pad-fan type) in greenhouse along daytime period in days with different climatic conditions. Air temperature and relative humidity measurements inside and outside of an greenhouse were made during the growing period of tomato plants cultivated in sand substrate. It was verified that the average daily evaporative cooling efficiency ranged from 74% to 81%. The maximum air temperature decrements, immediately after its passage through the cellulose pad, were 8.2°C and 11.4°C. It was also observed that the air cooling efficiency was sensitively improved when the vapor pressure deficit of the external air was higher than 1.8 kPa.   KEYWORDS: vapor pressure deficit, air temperature, evaporative cooling efficiency.  

scholarly journals Use of Magnetocaloric Material for Magnetic Refrigeration System: A Review

2019 ◽  
Vol 16 (3) ◽  
pp. 209-224
Author(s):  
I. A. Abdel-Latif ◽  
Mahrous R. Ahmed
Keyword(s):  
Materials Science ◽  
Cooling System ◽  
Global Climate ◽  
Environmentally Friendly ◽  
Magnetic Refrigeration ◽  
Cooling Efficiency ◽  
Cooling Systems ◽  
Magnetic Refrigerator ◽  
System A ◽  
Alternative Materials

Our daily need to cooling system is grown up. The used cooling systems are the source of the harmful changes in the global climate. And so, we need to search a new alternate cooling systems applying environmentally friendly technology that may help in decreasing the pollutions in our world. The progress in materials science allows to use some materials for cooling purposes. This new class of materials is so called "magnetic refrigerator". The basics of magnetic refrigeration depends on the magneto-caloric properties to reach low temperatures and obtain cooling system. The advantage of magnetic refrigerator (MR); First, the cooling efficiency is higher than conventional vapor refrigerator CVM where its cooling efficiency ~30-60% while the cooling efficiency in CVM ~ 5-10%. Second, MR can be more compactly built. Third, it is safe and an environmentally friendly cooling. In this work, we will highlight on the scientific efforts to find optimum properties to be applied as the magnetic refrigeration. In this review the highlights of the scientific efforts to seek for the best alternative materials to be used as a magnetic refrigeration applications. The low coast and small size of magnetic cooling is one the important advantage. This review consists of five sections; I. Introduction, II.Synthesis of MC materials, III. Crystal structure of MC materials and IV. Characterization and applications of MC materials, and V. Conclusions.

Studies of Radiative Cooling Systems for Storing Thermal Energy

1989 ◽  
Vol 111 (3) ◽  
pp. 251-256 ◽  
Author(s):  
S. Ito ◽  
N. Miura
Keyword(s):  
Heat Flux ◽  
Energy Storage ◽  
Air Temperature ◽  
Storage Tank ◽  
Cooling System ◽  
Ambient Air ◽  
Radiative Cooling ◽  
Cooling Systems ◽  
Average Temperature ◽  
Radiative Power

The thermal performance of an uncovered radiator and a radiative cooling system was investigated experimentally and theoretically. The net radiative power of a black painted surface at ambient air temperature was measured by heat flux plates at night in order to use the results for predicting temperatures of the radiator surface and the fluid in the cooling system on the same night. The net radiative power obtained by the measurements was 40–60 W/m2 on clear nights in the summer and 60–80 W/m2 in the fall and winter. The average temperature of the energy storage tank on clear nights became 2–5°C below the ambient temperature. The experimental and analytical results agreed well with each other.

scholarly journals Heat Treatment and Ventilation Optimization in a Deep Mine

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Xingxin Nie ◽  
Xiaobin Wei ◽  
Xiaochen Li ◽  
Caiwu Lu
Keyword(s):  
High Temperatures ◽  
Mine Water ◽  
Cooling System ◽  
Ventilation System ◽  
Ventilation Network ◽  
Cooling Systems ◽  
Deep Mine ◽  
Working Face ◽  
Deep Pit ◽  
Western Area

In order to address the issue of high temperatures and thermal damages in deep mines, the factors causing downhole heat damage at high temperatures were analyzed, the mine ventilation system was optimized and rebuilt, and a cooling system was established. The proposed cooling system uses mine water as the cooling source, and its features are based on the analysis of traditional cooling systems. The current ventilation system in the 1118 m deep pit of the Jinqu Gold Mine was evaluated, and the ventilation network, ventilation equipment, and ventilation structures near the underground working face were optimized. The low-temperature mine water stored in the middle section of the mine at 640 m depth was used as the cooling source, and a cooling system was established near the 440 m deep middle return well to alleviate the high-temperature and high-humidity conditions of the 280 m deep middle-western area. The results show that the effective air volume in the west wing at 280 m was 3.0 m3/s, the operating ambient temperature was 27.6°C, the relative humidity was reduced to 76%, and the temperature was reduced by 5-6°C after the optimization of the system.

Cooling Systems for Refuge Alternatives in Hot Mine Conditions

2018 ◽  
Author(s):  
Lincan Yan ◽  
David Yantek ◽  
Miguel Reyes ◽  
Nicholas Damiano ◽  
Justin Srednicki ◽  
...  
Keyword(s):  
Air Temperature ◽  
Elevated Temperatures ◽  
Storage Capacity ◽  
Cooling System ◽  
Cooling Capacity ◽  
Cooling Systems ◽  
Air Conditioning System ◽  
Test Methodology ◽  
Air Supply ◽  
Entire Duration

The accumulated heat and humidity inside occupied refuge alternatives (RAs) can impose risk of heat stress to the occupants. The accumulated heat could be from the metabolic and environmental sources. For hot mines, the high ambient temperature makes it more difficult to dissipate heat accumulated inside the RA. A cooling system is then needed to reduce the interior heat and humidity. Two types of cooling systems were tested out for their cooling capacity. One cooling system is a portable, battery-powered, air conditioning system and the other is a portable cryogenic air supply. During the testing, the mine air temperature surrounding the RA was elevated to and maintained at 85°F to simulate hot mine environment. The tests demonstrated that both cooling systems were able to control the air temperature inside the RA even though they did not last the entire duration of a 96-hour test. This paper provides an overview of the test methodology and findings as well as guidance on improving the performance of both cooling systems, including: optimizing the cooling cycle for the battery-powered AC system and increasing the flow rate and tank storage capacity for the cryogenic system. The information in this publication is useful for RA manufacturers and mines to develop the cooling systems that will enable providing the life sustaining environment in mines with elevated temperatures.

MAXIMIZING WATER USE EFFICIENCY OF EVAPORATIVE COOLING SYSTEMS USED TO DELAY GRAPE BUDBREAK

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 853G-853
Author(s):  
R. Louis Baumhardt ◽  
W. N. Lipe ◽  
David Rayburn ◽  
C. W. Wendt
Keyword(s):  
Wind Speed ◽  
Air Temperature ◽  
Water Conservation ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Global Radiation ◽  
Operation Time ◽  
Late Winter ◽  
Cooling Efficiency ◽  
System Operation

Mild temperatures during late winter have caused early budbreak in grapes which resulted in freeze injury and significant crop losses in 1980 and 1988. Evaporative cooling of grapevines with microsprinklers when the air temperature exceeded 10 °C (50 °F) used 100 liters/min/hectare of treated grapes (11 gallons/min/acre) and delayed budbreak for a period of 7 to 10 days. Methods of reducing the amount of water used while not reducing the cooling were evaluated. The average hourly difference between wet and dry bud temperatures, measured with thermocouples, were summed during the system operation time and compared as a function of air temperature, wind speed, global radiation, and relative humidity limits. Limiting the cooling system operation time as a function of air temperature, wind speed, or global radiation reduced cooling efficiency by approximately a one to one ratio. Limiting system operation to humidities less than 60% reduced the amount of water used by 33%, with only a 9% reduction in cooling efficiency. By changing the wetting interval employed in this research from 25 seconds every three minutes to 25 seconds every four minutes, total water conservation would increase to 50% with insignificant changes in cooling efficiencies. These system modifications would reduce water application requirements to 50 liters/min/hectare of grapes (5.5 gallons/minute/acre).

scholarly journals MAXIMIZING WATER USE EFFICIENCY OF EVAPORATIVE COOLING SYSTEMS USED TO DELAY GRAPE BUDBREAK

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 853g-853
Author(s):  
R. Louis Baumhardt ◽  
W. N. Lipe ◽  
David Rayburn ◽  
C. W. Wendt
Keyword(s):  
Wind Speed ◽  
Air Temperature ◽  
Water Conservation ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Global Radiation ◽  
Operation Time ◽  
Late Winter ◽  
Cooling Efficiency ◽  
System Operation

Mild temperatures during late winter have caused early budbreak in grapes which resulted in freeze injury and significant crop losses in 1980 and 1988. Evaporative cooling of grapevines with microsprinklers when the air temperature exceeded 10 °C (50 °F) used 100 liters/min/hectare of treated grapes (11 gallons/min/acre) and delayed budbreak for a period of 7 to 10 days. Methods of reducing the amount of water used while not reducing the cooling were evaluated. The average hourly difference between wet and dry bud temperatures, measured with thermocouples, were summed during the system operation time and compared as a function of air temperature, wind speed, global radiation, and relative humidity limits. Limiting the cooling system operation time as a function of air temperature, wind speed, or global radiation reduced cooling efficiency by approximately a one to one ratio. Limiting system operation to humidities less than 60% reduced the amount of water used by 33%, with only a 9% reduction in cooling efficiency. By changing the wetting interval employed in this research from 25 seconds every three minutes to 25 seconds every four minutes, total water conservation would increase to 50% with insignificant changes in cooling efficiencies. These system modifications would reduce water application requirements to 50 liters/min/hectare of grapes (5.5 gallons/minute/acre).

Assessment of thermal behavior of a cooling system to reduce thermal fatigue cracks in aluminum injection molds

2020 ◽  
pp. 75-86
Author(s):  
Sergio Antonio Camargo ◽  
Lauro Correa Romeiro ◽  
Carlos Alberto Mendes Moraes
Keyword(s):  
Thermal Fatigue ◽  
Cooling System ◽  
Fatigue Cracks ◽  
Cooling Water ◽  
Thermal Conditions ◽  
Thermal Gradients ◽  
Ansys Software ◽  
Cooling Systems ◽  
Thermal Fatigue Cracks ◽  
Number Of Cycles

The present article aimed to test changes in cooling water temperatures of males, present in aluminum injection molds, to reduce failures due to thermal fatigue. In order to carry out this work, cooling systems were studied, including their geometries, thermal gradients and the expected theoretical durability in relation to fatigue failure. The cooling system tests were developed with the aid of simulations in the ANSYS software and with fatigue calculations, using the method of Goodman. The study of the cooling system included its geometries, flow and temperature of this fluid. The results pointed to a significant increase in fatigue life of the mold component for the thermal conditions that were proposed, with a significant increase in the number of cycles, to happen failures due to thermal fatigue.

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