Evaluation of thermal performance for natural and forced draft wet cooling tower

Al-Dulaimi, Mustafa J.; Kareem, Fadhil Abdulrazzaq; Hamad, Faik

doi:10.15282/jmes.13.4.2019.19.0475

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The performance of the cooling tower can be expressed by some parameter such as the cooling rage, which defines as the water temperature difference of the inlet and outlet streams [7] wi we R T T =− (5) Cooling capacity defines as the heat rejected from water to the air stream [7,12] ( )…”

Section: Energy Analysismentioning

confidence: 99%

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Effect Of The Water Inlet Temperature And Flow Rate On The Energy And Exergy Performance of A Forced Draft Counter Wet Cooling Tower

Kareem

Khalaf

Al-Dulaimi³

et al. 2021

Preprint

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Cooling towers, wherein water and air are contacted directly with each other, are specialized heat exchangers. These open-topped, tall, cubical or cylindrical shaped are responsible for reducing the temperature of the water that generated from the industrial or HVAC systems. The performance of the forced draft wet cooling tower is investigated experimentally. The performance analysis is based on the first and second law of thermodynamics. The impact of the inlet water temperature and water inlet flow rate is investigated. The inlet water temperature is varied from 28 °C to 42 °C for the water flow rates of (0.03, 0.05 and 0.075 kg/sec). The results reveal that the cooling capacity, cooling range, thermal efficiency and the total exergy destruction increase according to the increase in the inlet water temperature and the water flow rate. The maximum cooling range is found to be 14.8 °C with the maximum thermal efficiency of 74 %. On other hand, the exergy efficiency decreases with the increasing of the inlet water temperature and the water flow rate within a range of 11.9 % to 57.8 %.

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Section: Energy Analysismentioning

confidence: 99%

“…Cooling tower efficiency defines as the ratio of actual heat rejected from water to the maximum heat that can be rejected from cooling tower, and it can be calculated by [7,12] ( ) ( )…”

Section: Energy Analysismentioning

confidence: 99%

Effect Of The Water Inlet Temperature And Flow Rate On The Energy And Exergy Performance of A Forced Draft Counter Wet Cooling Tower

Kareem

Khalaf

Al-Dulaimi³

et al. 2021

Preprint

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“…thermal performances of natural wet cooling refrigerant is presented in [1]. Two different alternatives for powering refrigeration systems, they are direct current (DC) or alternative current (AC) [2].…”

Section: Introductionmentioning

confidence: 99%

DC Environment for a Refrigerator With Variable Speed Compressor; Power Consumption Profile and Performance Comparison

Sabry

Ker

2020

IEEE Access

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DC power distribution in residential sector has regained interest among researchers and industrial players as new electronics-based appliances became locally available. However, the compatibility of appliances with DC distribution systems still requires much research effort. This work mainly explores on the power consumption profile of an inverter-driven Variable Speed Controller (VSC-based) refrigerator that has not yet been analyzed as one of the most important household loads. This paper compares the power consumption in two scenarios; 1) using three supply configurations for a VSC-based refrigerator, a Battery-Inverter-Load, a Battery-Load and Grid-Load, and 2) using a same AC power source to supply a VSC-based refrigerator and a same-size conventional refrigerator. This analysis helps toward modeling and energy estimation of PV system applications involving storage batteries. A wireless monitoring circuit has been employed to handle temperature, current and voltage measurements with a high sampling rate to cover the potential surge power. The experimental measurements show a better performance on using DC over AC power source and the power rate consumed has a smooth pattern at the starting-on time until approach a rated power. The measured efficiency of the Battery-Load topology approaches 99% compared to that of the Battery-inverter-load topology, which is approximately 78.5%. It is also found that the tested refrigerator with Battery-Load topology consumes an energy amounting to 1.850 kWh daily, while with Battery-inverterload topology consumes 2.466 kWh daily under the same operating conditions. These results can serve as a model for modeling refrigerators and other appliances that adopt speed controller technology to drive their motors.INDEX TERMS Compression refrigeration system, dc microgrid, total power consumption, building energy modeling, PV-battery systems.

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“…In addition, Phase Change Materials (PCMs) technology is widely used in arid regions to enhance the occupant's thermal comfort [8][9][10][11]. For cooling applications, Dulaimi et al [12] investigated the thermal performance of a natural draft wet cooling tower, natural draft condition, and a forced draft condition created by an axial fan. Their results showed a 22% increase in the cooling effectiveness in comparison with the traditional techniques.…”

Section: Introduction Thermal Comfortmentioning

confidence: 99%

Investigation of the natural ventilation of wind catchers with different geometries in arid region houses

Sakhri

Menni

Ameur³

et al. 2020

JMES

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The wind catcher or wind tower is a natural ventilation technique that has been employed in the Middle East region and still until nowadays. The present paper aims to study the effect of the one-sided position of a wind catcher device against the ventilated space or building geometry and its natural ventilation performance. Four models based on the traditional design of a one-sided wind catcher are studied and compared. The study is achieved under the climatic conditions of the South-west of Algeria (arid region). The obtained results showed that the front and Takhtabush’s models were able to create the maximum pressure difference (ΔP) between the windward and leeward of the tower-house system. Internal airflow velocities increased with the increase of wind speed in all studied models. For example, at Vwind = 2 m/s, the internal flow velocities were 1.7, 1.8, 1.3, and 2.5 m/s for model 1, 2, 3, and 4, respectively. However, at Vwind = 6 m/s, the internal flow velocities were 5.6, 5.5, 2.5, and 7 m/s for model 1, 2, 3, and 4, respectively. The higher internal airflow velocities are given by Takhtabush, traditional, front and middle tower models, respectively, with a reduction rate between the tower outlet and occupied space by 72, 42, 36, and 33% for the middle tower, Takhtabush, traditional tower, and the front model tower, respectively. This reduction is due to the due to internal flow resistance. The third part of the study investigates the effect of window (exist opening) position on the opposite wall. The upper, middle and lower window positions are studied and compared. The air stagnation or recirculation zone inside the ventilated space reduced from 55% with the lower window to 46% for the middle window and reached 35% for the upper window position. The Front and Takhtabush models for the one-sided wind catcher with an upper window position are highly recommended for the wind-driven natural ventilation in residential houses that are located in arid regions.

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Evaluation of thermal performance for natural and forced draft wet cooling tower

Cited by 3 publications

References 10 publications

Effect Of The Water Inlet Temperature And Flow Rate On The Energy And Exergy Performance of A Forced Draft Counter Wet Cooling Tower

Effect Of The Water Inlet Temperature And Flow Rate On The Energy And Exergy Performance of A Forced Draft Counter Wet Cooling Tower

DC Environment for a Refrigerator With Variable Speed Compressor; Power Consumption Profile and Performance Comparison

Investigation of the natural ventilation of wind catchers with different geometries in arid region houses

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