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Thermal Characteristics of Closed Wet Cooling Tower Using Different Heat Exchanger Tubes Arrangement

This paper presents thermal characteristics analysis of a modified Closed Wet Cooling Tower (CWCT) based on heat and mass transfer principles to improve the performance of this tower in Iraq. A prototype of CWCT optimized by added packing was designed, manufactured and tested for cooling capacity of 9 kW. Experiments are conducted to explore the effects of various operational and conformational parameters on the thermal performance. In the test section, spray water temperature and both dry bulb temperature and relative humidity of the air measured at intermediate points of the heat exchanger and packing. Heat exchangers consist of four rows and eight columns for an inline tubes arrangement and six rows and five columns for staggered tubes arrangement. According to experimental data, the inline tubes arrangement has a better thermal performance than the staggered tubes arrangement. The inline tubes arrangement enhanced thermal efficiency more than (7%) compared to the staggered tubes arrangement. Furthermore the effect of added packing to CWCT on thermal performance was significant compared to CWCT without packing. Comparing CWCT with packing, it has been observed that the best performance for the CWCT with packing under heat exchanger. It can be watched that the thermal efficiency for CWCT with packing under heat exchanger and CWCT with packing above heat exchanger approximately (28%) and (16%) higher than that CWCT without packing respectively. This study provides correlations to predict heat and mass transfer considering the influences of operational parameters for both inline and staggered heat exchanger tubes arrangement.

 

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Publication Date
Wed Jun 01 2022
Journal Name
Political Sciences Journal
Radical democracy of Axel Honneth

In contemporary discourses the debate of most Western thinkers is about the efforts to clarify the normative foundations of democracy. And then, some political thinkers have adopted other models differ in terms of standards for traditional liberal democracy. Be the common goal of democracy will give the formation of a greater role than usual in political liberalism rather than limiting the participatory activity of citizens on the function to give permanent legitimacy to the exercise of state authority. The activity is to be permanently enshrined in the democratic public sphere and the issue must be understood as the source of all political decisions.

 

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Publication Date
Sun Jul 01 2001
Journal Name
Bulletin Of The Iraq Natural History Museum (p-issn: 1017-8678 , E-issn: 2311-9799)
CHECK LIST OF IRAQI BRYOFLORA

The pioneer contributions included a sign for Iraqi Bryoflora were those of (Juratzka &
Milde) and Schiffner published at the end of the 19th century i.e. (1870 & 1897) respectively.
However, throughout the whole next century, the 20th, only few papers, by different authors,
have been published separately. They are Schiffner (1913); Handel-Mazzetti (1914); Froelich
(1959); Vondracek (1962 & 1965); Agnew &Townsend (1970); Agnew ( 1973 ) ; Agnew&
Vondracek (1975); Long (1979); Al-Ni’ma (1994). The most comprehensive work among
them was the “Moss Flora of Iraq” by Agnew & Vondracek (1975). It included a description
of 54 genera and 145 species with an identification key in addition to notes

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Publication Date
Sun Aug 01 2021
Journal Name
Journal Of Engineering
Flood Management of Diyala River

Diyala Governorate was recently exposed to high flood waves discharged from Hemrin Dam. Since the dam was at its full capacity during the flood period, these waves were discharged to the Diyala River. Because of the reduction in Diyala River capacity to 750m3/s, the cities and villages on both sides of the river banks were inundated. Thus, the study's objective is to design a flood escape out of the Diyala River, to discharge the flood wave through it. The flood escape simulation was done by using HEC- RAS software. Two hundred twenty-three cross sections for the escape and 30 cross-sections of the Diyala River were used as geometric data. Depending on the geological formation that the escape passed t

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Publication Date
Sun Dec 01 2013
Journal Name
Political Sciences Journal
Activities of International Studies Branch

نشاطات فرع الدراسات الدولية

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Publication Date
Sat Jun 15 2019
Journal Name
Ibn Al-haitham Journal For Pure And Applied Sciences
Nuclear Structure Study of 188OS

The energy level scheme of 188Os has been established on the basis of
y-y coincidence measurements. Ge (Li) and HPGe detectors were
employed to study the gamma spectra produced in the -decay of 188Re to
188Os. Fourteen new transitions and four new levels at 1660, 1871, 1948
188and 2034 keV are suggested. Relative intensities from singles
measurements, branching ratios  and loft values were calculated and
multipolarities, spins and parities deduced

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Publication Date
Sun Jul 02 2023
Journal Name
Iraqi Journal Of Science
Seismicity Study of Khanaqin Area

A seismicity study of khanaqin city and surrounding area is carried out. More than 270
quakes between 22 Nov. to 30 Dec. 2013 are recorded by Iraqi Seismic Network (ISN).
Analyses of these events show earthquakes magnitude range between (1.2 – 5.6) degree,
focal depth between (4 – 27) km. Seismotectonic map for studied area is drawn .
Isointensity maps for the felt earthquakes are drawn and show the intensity range
between (I-VII) according to the modified Mercalli scale. Fault plane solutions for four
events in the study area indicate a reverse strike slip solution along planes with NW –SE
direction 

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Publication Date
Sun Apr 03 2005
Journal Name
Journal Of The Faculty Of Medicine Baghdad
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Publication Date
Thu Apr 11 2019
Journal Name
Political Sciences Journal
Scientific Activities College of branches

Scientific Activities College of branches

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Publication Date
Wed Jul 29 2020
Journal Name
Iraqi Journal Of Science
Security of Wireless Sensor Nodes

Due to the large-scale development in satellite and network communication technologies, there is a significant demand for preserving the secure storage and transmission of the data over the internet and shared network environments. New challenges appeared that are related to the protection of critical and sensitive data
from illegal usage and unauthorized access. In this paper, we address the issues described above and develop new techniques to eliminate the associated problems. To achieve this, we propose a design of a new sensor node for tracking the location of cars and collecting all information and all visited locations by cars, followed by
encryption in a sensor node and saving in the database. A microcontroller of Arduino es

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Publication Date
Sat Aug 17 2019
Journal Name
Journal Of Legal Sciences
Conditions of Criminal Procedural Work

In the event of a crime, a right to society arises in the imposition of the penalty by the perpetrator of the crime, through the criminal case, as it is the only way to do so. The acts carried out by the parties to the criminal proceedings, whether they are the litigants or others, are referred to as procedural actions. Directly any procedural action given only the availability of conditions

these conditions on the two communities: the first objective and the second formality, may relate to those conditions that the person who initiates the procedural or procedural work itself and can not work procedural to produce its impact if one of his conditions. The importance of these conditions of the importance of the rules of criminal p

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