scholarly journals Physiological and productive responses of environmental control on housed sows

2008 ◽  
Vol 65 (4) ◽  
pp. 335-339 ◽  
Author(s):  
Carlos Eduardo Bites Romanini ◽  
Yamilia Barrios Tolon ◽  
Irenilza de Alencar Nääs ◽  
Daniella Jorge de Moura
Keyword(s):  
Mechanical Ventilation ◽  
Natural Ventilation ◽  
Environmental Control ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Daily Weight Gain ◽  
Combined Treatments ◽  
Reproductive Response ◽  
Evaporative Cooling System ◽  
Fat Thickness

Swine housing must promote an adjusted environment for thermal comfort and high animal productivity without negatively affecting the sow performance and reproductive response. This study evaluated the use of distinct environmental cooling equipments on sow performance, both on the gestation and on nursing in open sided housing. Two treatments were tested in the gestation building: natural ventilation and mechanical ventilation associated to fogging; while in the nursing rooms three treatments were tested: natural ventilation; mechanical ventilation; and evaporative cooling with forced ventilation. Sows were randomly chosen from the same genetic lot form six combined treatments. The evaporative cooling system in the farrowing room differed for piglet performances, at birth (4% higher) and on daily weight gain (15% higher), and also for sow physiological response improving the respiratory rate (8%) and back fat thickness (3%), without influencing skin temperature. The use of evaporative cooling directed to the sow head during nursing improved the physiological and productive results.

scholarly journals A review of common natural ventilation and evaporative cooling systems for Greenhouses and the Nigerian reality

2021 ◽  
Vol 46 (3) ◽  
pp. 1-22
Author(s):  
C.E. Ikechukwu-Edeh ◽  
M.C. Ndukwu ◽  
I.E. Ahaneku
Keyword(s):  
Natural Ventilation ◽  
Cooling System ◽  
Local Development ◽  
Evaporative Cooling ◽  
Cooling Systems ◽  
Saturation Efficiency ◽  
Evaporative Cooling System ◽  
The Common ◽  
Ventilation Method ◽  
Cooling Methods

Greenhouses simulate the "desired" environment for successful growth and development of plants. They, by design, achieve this desired environment by supplying the necessary climatic inputs needed by the plants to strive and at the same time exclude factors impeding the growth of plants, hence it is called a controlled environment. One of the common and most desired attribute of the greenhouse is its ability to provide effective cooling to the plants. This paper reviewed, extensively, the concept of evaporative cooling as applied in greenhouses. Factors like Vapor Pressure deficit (VPD), Relative Humidity, Ambient Temperature were also discussed with regards to its effects on the efficiency of the evaporative cooling system. The efficiencies of the Fan and Pad System and the Fog systems were reviewed and compared with their consequent dependence on factors like nozzle spacing, nozzle length, saturation efficiency of pad material etc. The Natural Ventilation method was also reviewed as a "stand alone " greenhouse cooling method and as an augmentation to other cooling systems. Factors like rate of air exchange, total area of vents, wind speed, vent opening angles etc. were also discussed in line with their effects on the effectiveness of the Natural ventilation method. The Nigerian Perspective on Greenhouses and its Cooling methods was also discussed with reference to local development of evaporative coolers as well as its importation, its affordability, management, availability and appliance to the Nigerian farming culture.

scholarly journals Sustainability of Evaporative Cooling System for Environment Control for Preservation of Unearthed Historical Sites within Archaeological Museums in China

2020 ◽  
Vol 12 (23) ◽  
pp. 9882
Author(s):  
Bin Chang ◽  
Yuexi Dang ◽  
Xilian Luo ◽  
Chuck Wah Yu ◽  
Zhaolin Gu
Keyword(s):  
Energy Consumption ◽  
Environmental Control ◽  
Cooling System ◽  
Evaporative Cooling ◽  
High Energy ◽  
Suitability Analysis ◽  
Large Space ◽  
Desiccation Cracking ◽  
Evaporative Cooling System ◽  
Environment Control

Archaeological museums are usually constructed at the location where historical relic sites are unearthed and are often characterized by large-space building layouts and high energy consumption for the environmental control. However, the traditional strategies for environmental control are limited in protecting the unearthed relics from desiccation cracking and salt concentration. In this study, an environmental control strategy of evaporative cooling system is proposed as a solution to develop a sustainable preservation environment to maintain the condition of the ancient relics at a state of moist saturation. Afterwards, a verification of sustainability and climate suitability analysis of the proposed system were conducted. The results indicate that (1) the evaporative cooling system can fulfil the high humidity preservation environment requirements for the unearthed historical relic sites with a low energy consumption; and (2) the potential use of the evaporative cooling systems is significant in Xi’an and Chengdu (i.e., being 62% and 75%, respectively), and not in Lanzhou and Urumqi. As a conclusion, the proposed strategy provides a sustainable protocol for the preservation of unearthed historical relic sites in archaeological museum.

scholarly journals Analysis of the Performance of a Passive Downdraught Evaporative Cooling System Driven by Solar Chimneys in a Residential Building by Using an Experimentally Validated TRNSYS Model

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3486
Author(s):  
Andrés Soto ◽  
Pedro Martínez ◽  
Victor M. Soto ◽  
Pedro J. Martínez
Keyword(s):  
Natural Ventilation ◽  
Energy Savings ◽  
Cooling System ◽  
Evaporative Cooling ◽  
Residential Building ◽  
Climatic Conditions ◽  
Cold Climate ◽  
Humid Climate ◽  
Combined Model ◽  
Evaporative Cooling System

Natural ventilation, combined with a passive cooling system, can provide significant energy savings in the refrigeration of indoor spaces. The performance of these systems is highly dependent on outdoor climatic conditions. The objective of this study was to analyse the feasibility of a passive, downdraught, evaporative cooling system driven by solar chimneys in different climatic zones by using an experimentally validated simulation tool. This tool combined a ventilation model and a thermal model of the dwelling in which an empirical model of a direct evaporative system made of plastic mesh was implemented. For experimental validation of the combined model, sensors were installed in the dwelling and calibrated in the laboratory. The combined model was applied to Spanish and European cities with different climates. In the simulation, values of cooling energy per volume of air ranging between 0.53 Wh/m3 and 0.79 Wh/m3 were obtained for Alicante (hot climate with moderate humidity) and Madrid (hot and dry climate), respectively. In these locations, medium and high applicability was obtained, respectively, in comparison with Burgos (cold climate with moderate humidity) and Bilbao (cold and humid climate), which were low. The evaluation of the reference building in each location allowed establishing a classification in terms of performance, comfort and applicability for each climate.

Sign in / Sign up

Export Citation Format

Share Document