scholarly journals Evaporative cooling system for gestating and lactating sows: a systematic review

2020 ◽  
Vol 50 (10) ◽  
Author(s):  
Melissa Fabíola dos Santos Alves Mendes ◽  
David Henrique de Oliveira ◽  
Fábio Loures Cruz ◽  
Múcio André dos Santos Alves Mendes ◽  
Bruna Pontara Vilas Boas Ribeiro ◽  
...  
Keyword(s):  
Systematic Review ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Ambient Temperatures ◽  
Lactating Sows ◽  
Evaporative Cooling System ◽  
Bibliographic Search ◽  
And Performance ◽  
Lactating Sow ◽  
Climatic Characteristics

ABSTRACT: Climatic characteristics of the production sites of pigs influence the yield of the system, with breeding sows being a category extremely sensitive to high temperatures, especially when their upper critical temperature is reached. This review evaluated the effects of the evaporative cooling system on environmental, physiological and performance parameters in breeding sows. By means of this review, a bibliographic search was performed using the following keywords: sow; swine; gilt and pig combined individually with the expression ‘evaporative cooling’. A total of 11 papers met the prerequisites determined to compose the systematic review and the studies involved gestating and lactating sows maintained in environments that presented ambient temperatures between 21.5 and 34.8 °C and relative humidity between 32.2 and 84.2%. The evaporative cooling system was used in order to cool the macro or micro environment. It can be concluded that the use of evaporative cooling system promotes increase in feed intake per lactating sow, decrease in weight loss in lactation, increase of weight of piglets at weaning, temperature reduction of the barns and decrease of the respiratory rate of the sows. For gestating sows, no changes in reproductive performance were reported.

Study of the Thermodynamic Processes and Performance Evaluation of Self-Circulation Evaporative Cooling System in Hydro-Generator

2014 ◽  
Vol 488-489 ◽  
pp. 979-982
Author(s):  
Hai Hong Dong ◽  
Lin Ruan ◽  
Shu Qin Guo ◽  
Rui Cao ◽  
Jin Xiu Chen
Keyword(s):  
Performance Evaluation ◽  
Power Loss ◽  
Heat Load ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Second Law Of Thermodynamics ◽  
Evaporative Cooling System ◽  
Cooling Technology ◽  
And Performance ◽  
Thermodynamic Processes

The self-circulation evaporative cooling system (SECS) of stator collector ring is a kind of new cooling technology, utilizing the evaporating of work fluid to cool the stator collector ring of hydro-generator. In this article, the thermodynamic processes of SECS of stator collector ring were analyzed by the second law of thermodynamics. The entropy production and power loss of isolated SECS were analyzed. Based on the distinctive characteristics of SECS, a performance evaluation function was proposed. The influence of heat load on was discussed by simulating. The conclusions provide the theory basis for the application of this new cooling technology.

scholarly journals Gas Turbine Performance Improvement Direct Mixing Evaporative Cooling System American Atlas Cogeneration Facility Rifle, Colorado

1990 ◽  
Author(s):  
J. P. Nolan ◽  
V. J. Twombly
Keyword(s):  
Gas Turbine ◽  
Performance Improvement ◽  
Return On Investment ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Turbine Performance ◽  
Potential Problems ◽  
Evaporative Cooling System ◽  
Media Systems ◽  
And Performance

This paper discusses the design, installation, operation and performance of a direct mixing evaporative cooling system as an alternate to conventional wetted rigid media systems used for gas turbine power augmentation. The economic return on investment, the ease of installation, and the potential problems as they apply to a typical gas turbine based cogeneration facility are discussed and analyzed. Especially of interest is the low capital cost of this system, approximately one fourth that of a conventional system.

Important Parameters and Performance Testing of Evaporative Inlet Air Cooling System for Gas Turbines: A User’s Experience

2006 ◽  
Author(s):  
Hemant Gajjar
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Cooling System ◽  
Low Cost ◽  
Evaporative Cooling ◽  
Performance Testing ◽  
Air Cooling ◽  
Air Cooling System ◽  
Evaporative Cooling System ◽  
And Performance

Inlet Air Cooling of gas turbine engines for power augmentation has seen increasing application over the past decade. Evaporative inlet air cooling has been particularly preferred by the Gas Turbine operators due to its low cost and ease of installation. Two of the important considerations for a GT operator are the proper selection of the EIAC and, after installation, its proper testing to assure required performance. This paper is based on the experience, as a user, of selecting a inlet air cooling system and then implementing a Fogging type Evaporative Cooling system. It highlights the important parameters related to evaporative cooling system and in particular fogging, and how the site testing can be handled to ensure proper performance. Concepts of ‘Conversion Effectiveness’ and ‘Evaporation Effectiveness’ have also been introduced in this paper.

scholarly journals The impact of evaporative cooling on the thermoregulation and sensible heat loss of sows during farrowing

2014 ◽  
Vol 34 (6) ◽  
pp. 1050-1061 ◽  
Author(s):  
Eliene Justino ◽  
Irenilza de A. Nääs ◽  
Thayla M. R. Carvalho ◽  
Diego P. Neves ◽  
Douglas D'Alessandro Salgado
Keyword(s):  
Surface Temperature ◽  
Respiratory Rate ◽  
Heat Loss ◽  
Rectal Temperature ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Sensible Heat ◽  
Lactating Sows ◽  
Evaporative Cooling System ◽  
The Impact

Pigs are more sensitive to high environmental temperatures explained by the inability of sweating and panting properly when compared to other species of farmed livestock. The evaporative cooling system might favor the thermal comfort of animals during exposure to extreme environmental heat and reduce the harmful effects of heat stress. The purpose of this study was to assess the sensible heat loss and thermoregulation parameters from lactating sows during summer submitted to two different acclimatization systems: natural and evaporative cooling. The experiment was carried out in a commercial farm with 72 lactating sows. The ambient variables (temperature, relative humidity and air velocity) and sows physiological parameters (rectal temperature, surface temperature and respiratory rate) were monitored and then the sensible heat loss at 21days lactation was calculated. The results of rectal temperature did not differ between treatments. However, the evaporative cooling led to a significant reduction in surface temperature and respiratory rate and a significant increase in the sow's sensible heat loss. It was concluded that the use of evaporative cooling system was essential to increase sensible heat loss; thus, it should reduce the negative effects of heat on the sows' thermoregulation during summer.

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