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Article
Study of Transient Simulation for Solar Heating System

Authors: Laith Abdulmonem. Ismael --- Qussai Jihad Abdul-Ghafour --- Sabah Tarik Ahmed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 4 Pages: 677-697
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In the current study simulation method was used for design of solar waterheating system. An integrated transient simulation program was built up forsimulating the Iraqi solar house heating system using TRNSYS as a design tool.The modeling was carried out is modeled for other virtual solar heating systemssimilar to the Iraqi solar house. The results obtained were used to develop ageneral design procedure for solar heating systems in Baghdad.Using the design charts and TRNSYS as a design tool simplifies the designer’stask for predicting the long - term heating energy supplied from a solar collectorarray.The above simulation was applied for Iraqi solar house and the results gave theincreasing in storage volume caused increase the auxiliary energy supplied to thesystem. So, the best practical storage volume is 20m3 and increasing the collectorarea to optimum value results in increasing the solar fraction (f). The solar fractionmay reach 0.97 when the collector area becomes as 400m2 at storage volume of20m


Article
Modeling and Simulation of an Absorption Solar Cooling System Under Iraqi Weather Conditions

Author: H.A. Hussein
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 4 Part (A) Engineering Pages: 356-364
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This work aims to model and simulate an absorption cooling system using solar flat- plate receiver with water lithium bromide (li.Br-H2O) mixture as a working fluid, and to select the optimum type for absorption cooling system, which have suitable application in Iraq. Weather conditions for Erbil city have been selected. Coefficient of performance (COP) for a single, double (series and parallel), half and triple effect of an absorption cooling system are calculated and optimized. COP Prediction, hot water temperature, and the rate of heat transfer have been simulated and represented by using TRNSYS and EES programs. Active area of the solar flat-plate receiver is calculated and optimized for five suggested areas of (140, 150, 160, 170, and 180 m 2). Average heating load, average daily - radiation and cooling load for summer months (June, July, August, and September) have been calculated. The results indicated that, the superior type of the four absorption-cooling systems is a single effect, which has COP 80% at generator temperature of (81 °C). Also the results indicated that the optimum area of solar flat-plate receiver was 160 m2 which has achieved the maximum capacity of cooling power and consumed capacity in the generator (50, and 62.5) kW respectively. I think, according to the previous studies , the current work is the first in Iraq because it approved that, single effect type is an efficient and more relevant type for good working under Iraqi climate by using solar flat–plate receiver and suitable to apply it experimentally in a wide range.

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