Effect of Water Flow Rate on Cooling Effectiveness and Air Temperature Change in Evaporative Cooling Pad Systems

Karaca, Cengiz; Yildiz, Yılmaz; Dağtekin, Metin; Gümüş, Zekai

doi:10.30638/eemj.2016.089

Cited by 7 publications

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“…The weekly mean values for saturation efficiency during the experimental period were 73.75%, 71.3%, and 70.63% for water flow rates of 4.76, 5.56, and 6.35 L min -1 m -2 , respectively. These findings are similar to those ofKaraca et al (2016). Three multiple regression equations were developed to describe the relationship between SE and outdoor temperature (Tdb,o), outdoor relative humidity (RHo), and temperature of the pad (Tp) for the various water flow rates.…”

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confidence: 73%

“…The pad face air velocity should range between 0.5 and 1.5 m s -1 ( Dağtekin et al, 2011). Karaca et al (2016) studied the relationship between the cooling effect and the pad water flow rate (2, 4, and 6 L min -1 m -2 ) and two different pad air velocities (1.0 and 1.5 m s -1 ). The cooling effect and saturation efficiency values were the lowest at a water flow rate of 6 L min -1 m -2 , but they also were relatively similar at water flow rates of 4 and 2 L min -1 m -2 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of pad water flow rate on evaporative cooling system efficiency in laying hen housing

Ghoname

2020

J Agricult Engineer

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An experiment was conducted in three commercial laying hen houses with 32-week-old hens in the summer of 2017 in a commercial farm in Gharbia Province, Egypt (31.06ºN, 31.16ºE) using an evaporative pad cooling system to determine the most suitable water flow rate for maintaining indoor air temperature within the thermal comfort zone. The experiment was conducted using three different water flow rates, i.e. 4.76, 5.65, and 6.35 L min–1.m–2, to assess the effect of different water flow rates on evaporative pad cooling system performance and determine the most suitable water flow rate for maintaining the thermal comfort zone of laying hens. The evaporative pad cooling system maintained the mean indoor air temperature below 28°C. The mean indoor air relative humidity during the experimental period ranged from 72.6 to 73.8%. The 4.76 L min–1.m–2 water flow rate resulted in the highest saturation efficiency (ca. 73.75%). In contrast, the 6.35 L min–1 m–2 water flow rate resulted in the lowest saturation efficiency (70.63%). The mean cooling energy values were 69.11, 66.0, and 66.65 kwh for water flow rates of 4.76, 5.56, and 6.35 Lmin–1m–2, respectively. The highest temperature-humidity index was 27.78°C, which indicated that birds were not stressed in all treatments.

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confidence: 73%

Section: Introductionmentioning

confidence: 99%

Effect of pad water flow rate on evaporative cooling system efficiency in laying hen housing

Ghoname

2020

J Agricult Engineer

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“…Adult chickens body temperature varies between 39 and 40 o C. Poultry house indoor temperature has an immediate impact on poultry, depending on how well it is monitored and controlled. Karaca et al (2016) found that cooling efficiency and the reduction temperature of the air passing through the pad were lower at water flow rate of 6 l/min.m 2 . The most adequate water flow rate for the experimental conditions was considered 4 l/min.m 2 .…”

Section: Introductionmentioning

confidence: 94%

“…The maximum values were 10, 11.5 and 8.8 o C under water flow rates of 2, 4 and 6 l/min.m 2 , respectively at 13.00 pm. The most adequate water flow rate for the experimental conditions was considered 4 l/min.m 2 according to Karaca et al (2016). The decrease in temperature reduction at 6 l/min.m 2 With regard to using indirect evaporative cooling system (IEC), it was seen that increasing water flow rates from 2 to 6 l/min.m 2 gave inverse results of temperature reduction.…”

Section: Temperature Reductionmentioning

confidence: 99%

Performance Evaluation of Poultry Houses Under Different Evaporative Cooling Systems

Abdel-Rahman

2020

Zagazig Journal of Agricultural Research

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Poultry production occupied a major role in the agriculture industry worldwide. Poultry housing design plays a vital role in determination of the internal climatic conditions for optimum health, growth and productive performance of the poultries. The present investigation aimed to evaluate the performance of different evaporative cooling systems with environmental control of poultry houses. The effect of two different evaporative cooling systems (direct and indirect) under three water flow rates of 2, 4 and 6 l/min.m 2 on poultry houses performance was evaluated in terms of temperature reduction, relative humidity, evaporative cooling efficiency, poultry weight, consumed energy and cost. Experimental results revealed that using direct evaporative cooling system with 4 l/min.m 2 water flow rate and indirect evaporative cooling system with 2 l/min.m 2 water flow rate provided sufficient conditions of temperature reduction (9.59 and 7.28 o C), relative humidity (63.88 and 61.21%), cooling efficiency (75.67 and 83.67 %), poultry weight (2.4 and 2.3 kg) and consumed energy (1.2 and 6 kW.day) with net return (7.54 and 5.80 LE/kg), in that order. Based on previously mentioned results, it is recommended to use direct evaporative cooling system for poultry houses as it minimizes both energy and cost requirements compared to the indirect evaporative cooling system, therefore it was found to be suitable for small rural farmers.

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“…The results clarified that the average daily cooling efficiency values during June, July and August were determined by 77.4%, 75.6% and 79.5%, respectively. Karaca et al (2016) determined the relation between the temperature decrease of the passing air through cellulose based pad and the water flow rate of pad moistening in the evaporative cooling pad systems. Values of cooling efficiency and the temperature decrease of the air passing through the pad were lower at water flow rate of 6 L/min.m 2 , while they were close to each other at (2 and 4 L/min.m 2 ).…”

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confidence: 99%

Applying Direct Evaporative Cooling System for Controlling Environmental Conditions in Rabbit Houses

El-Maghawry

2018

Misr Journal of Agricultural Engineering

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Heat stress is a major problem that faces rabbit's breeders. This problem adversely affects rabbit's growth and reduces the resistance to diseases. The present research was carried out to apply and evaluate the performance of a direct evaporative pad cooling system in rabbit houses to control environmental conditions. The direct evaporative pad cooling system performance was studied as a function of change in pad thickness (10 and 15 cm), water flow rate (3, 5 and 7 L/min.m 2 ) and rabbit stocking density with an approximate average (0.5 and 1.0 rabbit/m 2 ). Performance evaluation of the evaporative pad cooling system was carried out in terms of temperature reduction, cooling efficiency, temperature-humidity index, daily body weight gain and mortality ratio. The experimental results clarified that values of temperature reduction (7.3 and 6.8 o C), cooling efficiency (94.92 and 90.91 %), temperature-humidity index (26.30 and 27.40 o C), daily body weight gain (38.80 and 38 g/rabbit/day) and mortality ratio (0.2 and 0.4 %) are in the optimal limits under conditions of 15 cm pad thickness and 5 L/min.m 2 water flow rate for rabbit stocking densities of 0.5 and 1.0 rabbit/m 2 , respectively. INTRODUCTION he Egyptian people like so many foods made of rabbits; therefore, rabbit's projects are economically important. Rabbits are often breeding in cages or batteries. The clearest limitation of rabbit production in hot climate regions is this species susceptibility to heat stress. Heat stress occurs mainly when animals are exposed to high direct and indirect solar radiation, high humidity, high ambient temperatures and low wind speed. Willmer et al. (2000) defined heat stress as a stress caused by an extensive range of environmental conditions that motivate physiological strain state within the animal's body, meaning that animals are unable to regulate their thermal balance in a negative way.

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Effect of Water Flow Rate on Cooling Effectiveness and Air Temperature Change in Evaporative Cooling Pad Systems

Cited by 7 publications

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Effect of pad water flow rate on evaporative cooling system efficiency in laying hen housing

Effect of pad water flow rate on evaporative cooling system efficiency in laying hen housing

Performance Evaluation of Poultry Houses Under Different Evaporative Cooling Systems

Applying Direct Evaporative Cooling System for Controlling Environmental Conditions in Rabbit Houses

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