Jasim Abdulateef | University of Diyala (original) (raw)

Papers by Jasim Abdulateef

The continuous increase in the level of greenhouse gas emissions and the depletion of fossil fuel... more The continuous increase in the level of greenhouse gas emissions and the depletion of fossil fuels are identified, as the major driving forces behind efforts to effectively utilize different sources of renewable energy. Solar energy considered one of the most prospective sources of this energy. This review paper mainly focuses on the majority of heat-transfer enhancement techniques between the phase-change material (PCM) and the heat-transfer fluid (HTF) based on the application of fins embedded in the PCM. This study also investigated the geometrical dimensions, dimensionless numbers, and fin location through numerical and experimental works conducted to assess the influences of these parameters on the thermal performance of PCM-latent heat thermal energy storage (LHTES) containers. The best enhancement is achieved using the longitudinal finned configurations because of its easy design and fabrication, especially along circumference of the cylindrical PCM containers. The circular-finned tube was also more effective than the pinned-tube for different shell and tube. PCMs based on heat sinks with internal pin fins were widely used for the thermal management of various pieces of electronic products. The heat enhancement factor was effectively dependent on increasing the numbers and dimensions of these fins. Further researches still require to explore the possible geometrical designs of fins and their key findings, which have more effect on the thermal performance of the finned-LHTES system.

International Journal of Mechanical Engineering and Applications, 2015

This paper aims to investigate the relationship between maximum stresses produced and cycle life ... more This paper aims to investigate the relationship between maximum stresses produced and cycle life of different shaped bellows expansion joints. Flexible pipe bellows which have been selected in the present study are made of stainless (STS 304) and (STS 316) material based on two types of (axial, and axial with control ring) with three shapes of bellow section (U-shape, Ω-shape and disc-shape). Our calculation is done using simulation model written by MATLAB. The simulation results show that, U-shaped bellow has smaller internal pressure-induced stress, longer fatigue life, and is more suited for higher internal pressure situations. The most essential bellow design factor is the correct specification of the bellow movement requirements.

A procedure is presented for assessing the economic viability of combined solar-assisted ejector ... more A procedure is presented for assessing the economic viability of combined solar-assisted ejector absorption refrigeration system in terms of the life cycle savings function. The optimization is carried out for a combined system that has been designed for Malaysia and similar tropical regions using ammonia-water as working fluid. The life cycle savings is expressed in a generalized form in terms of two economic parameters, P 1 and P 2 , which relate all life cycle cost considerations to the first year fuel cost or the initial solar system investment cost. The typical meteorological year file containing the weather parameters for Malaysia is used to calculate the monthly average daily radiation and solar fraction. An example for economical evaluation and optimization is presented. The optimum system for Malaysia's climate for a 5 kW (1.5 refrigeration ton) system consists of 35 m 2 evacuated tubes solar collector sloped at 15 o .

... study of Malaysia. WSEAS Transactions on Environment and Development 2008.4(4) 373-378 [14] A... more ... study of Malaysia. WSEAS Transactions on Environment and Development 2008.4(4) 373-378 [14] AW Azhari, A. Zaharim, K. Sopian, AH Ibrahim. Cloud based models in determination of solar radiations. Proceedings of the ...

Solar Energy, 2013

ABSTRACT Performance of the absorption cooling system is still a challenge due to the coefficient... more ABSTRACT Performance of the absorption cooling system is still a challenge due to the coefficient of performance (COP) that is generally poor when compared with the conventional vapor compression cycle. High solar radiation in hot climates is usually associated with high ambient temperature and consequently peak cooling demand. Absorption cooling cycles can be powered by solar but the performance is limited by heat source temperature (solar collector) and high ambient temperature that can affect the condensation process. Efficiency enhancement of the system components is essential to increase the COP of the system. A modification in the combined absorption–ejector cooling system is adopted. Adding a removable flash tank between the condenser and evaporator could improve entrainment ratio of the ejector, along with improving the cooling effect inside the evaporator. A computer simulation program is developed to evaluate the performance of the modified combined cycle using aqua-ammonia (NH3–H2O) refrigerant. The performance of the proposed combined cooling cycle is compared with basic absorption, and combined absorption–ejector cooling cycles. Results showed a significant improvement in the COP of the modified cycle at different operating conditions. Cooling effect and capacity of the evaporator is enhanced due to the reduction of flash gas delivered to the evaporator. Furthermore, the flash tank optimized the ejector entertainment ratio and consequently increasing the condenser pressure. This optimization will enable the system to perform well in hot climates where the condenser efficiency is limited by ambient temperature.

SSRN Electronic Journal, 2000

Low-income people do not have the alternatives to choose for a quality house, and they also do no... more Low-income people do not have the alternatives to choose for a quality house, and they also do not have many options to rent or buy an affordable house in the centre of town due to financial constraints. These people spend a long time commuting from the suburb to the work place located in the core of the city. They face many problems, such as air and noise pollution, and traffic congestion every day. All of these issues happen because of the lack of attention to sustainable development elements and smart growth. Hence, this research introduces a financial model that enables the low-income people to live near their work stations. It discusses the implementation of Smart Growth principles, which can help urban managements to improve the urban quality for the residents. By making new extra value with the introduction of new aspects for density and estimating the saving of Smart Growth can provide the opportunity to shift from low-income housing to affordable quality housing. The main case study for this research is the Gasing Indah project, which includes a mixed development on the border between Kuala Lumpur and Petaling Jaya in Malaysia. This case study makes a feasibility study on different regulations on both sides of the above border for a unique project. It means that, this project is a unique one with two different governmental restrictions and prices. A practical guideline is presented to all urban planners, municipalities and governmental policy makers, which can improve the life quality and housing efficiency of low-income people who are working in city centres.

Renewable and Sustainable Energy Reviews, 2009

The objective of this paper is to provide a literature review on solar-driven ejector refrigerati... more The objective of this paper is to provide a literature review on solar-driven ejector refrigeration systems and to give useful guidelines regarding background and operating principles of ejector. The development history and recent progress in solar-driven ejector refrigeration systems are reported and categorized. It shows that solar-driven ejector refrigeration technologies are not only can serve the needs for cooling requirements such as air-conditioning and ice-making and medical or food preservation in remote areas, but ...

Journal of Mechanical Engineering, 2013

Proceedings of the …, 2010

Abstract:-Solar hydrogen system is a unique power system that can meet the power requirement for ... more Abstract:-Solar hydrogen system is a unique power system that can meet the power requirement for the energy future demand, in such a system the hydrogen used to be the energy carrier which can produced through the electrolyzers with the assist of the power ...

Proceedings of the 3rd Wseas Int. Conf. On Renewable Energy Sources, 2009

Abstract:-The experimental investigation of the performance of a solar absorption refrigeration s... more Abstract:-The experimental investigation of the performance of a solar absorption refrigeration system is described. The influence of generator, evaporator and condenser temperatures on the system performance is studied using evacuated tube solar collectors and ammonia-water as working fluid. It was seen that if higher cooling capacity and also lower evaporator temperature are desired from the system, the generator temperature should be increased considerably. In general, a solar absorption system can work only if ...

Int J Energy, 2007

Abstract-Absorption refrigeration systems powered by solar energy increasingly attract research i... more Abstract-Absorption refrigeration systems powered by solar energy increasingly attract research interests in the last years. In this study, thermodynamic analyses for different working fluid pairs are performed. A computer simulation model has been developed to predict the performance of solar absorption refrigeration system using different working fluid. The model is based on detailed mass and energy balance and heat and mass transfer for the cycle component. Detailed thermodynamic properties for ammonia-water, ammonia- ...

Proceedings of the 4th …, Feb 24, 2009

Abstract: A procedure is presented for assessing the economic viability of a solar cooling system... more Abstract: A procedure is presented for assessing the economic viability of a solar cooling system in terms of the life cycle savings function. The optimization is carried out for a solar cooling system that has been designed for Malaysia and similar tropical regions using evacuated tube solar collectors and ammonia-water absorption unit. The life cycle savings is expressed in a generalized form in terms of two economic parameters, P1 and P2, which relate all life cycle cost considerations to the first year fuel cost or the initial solar system ...

International Journal of Mechanical and Materials Engineering, 2008

Solar absorption refrigeration systems increasingly attract research interests. The most common c... more Solar absorption refrigeration systems increasingly attract research interests. The most common cycles are H 2 O-LiBr and NH 3 -H 2 O, absorption machines that have served as standards for comparison in studying and developing new cycles and new refrigerant-absorbent pairs. In recent years, research has been devoted to improvement of the performance of ammonia-water absorption refrigeration systems. In the present study, thermodynamic properties for ammonia-water, ammonia-lithium nitrate and ammoniasodium thiocyanate solutions are compiled and are used in cycle simulation. Detailed thermodynamic design data and optimum design results are presented. Thermodynamic properties of these binary fluids are expressed in polynomial equations. The performances of these three cycles against various generator, evaporator, absorber and condenser temperatures are compared. The results show that the ammonia-lithium nitrate and ammonia-sodium thiocyanate cycles give better performance than the ammonia-water cycle, not only because of higher COP values, but also because of no requirement for analyzers and rectifiers. The ammonia-sodium thiocyanate cycle cannot operate at evaporator temperatures below -10°C for the possibility of crystallization. These results form a source of reference for developing new cycles and searching for new refrigerant-absorbent pairs. They can also be used in selecting operating conditions for existing systems and achieving automatic control for maintaining optimum operation of the systems.

Abstract: This study presents an economic analysis on a solar based stand-alone PV system to prov... more Abstract: This study presents an economic analysis on a solar based stand-alone PV system to provide the required electricity for a typical home. The area under interest selected is the solar energy park located at University Kebangsaan Malaysia in Bangi, Malaysia. The stand-alone PV system consists of a Solar panel, DC-DC Converter, Maximum Power Point Tracker, DC/AC Inverter, and Battery. The life cycle cost (LCC) analysis is used to assess the economic viability of the system. The economic analysis results of the study encouraged ...

A numerical investigation of transient, two-dimensional natural convection in horizontal isotherm... more A numerical investigation of transient, two-dimensional natural convection in horizontal isothermal cylindrical annuli is performed to investigate the Prandtl number and diameter ratio effect on flow and heat transfer characteristics. The finite difference method is used to solve the governing equations, in which buoyancy is modeled via the Boussinesq approximation. Both vorticity and energy equations are solved using alternating direction implicit (ADI) method and stream function equation by successive over relaxation (SOR) method. Solutions for laminar case are obtained up to Grashof number of 10 5 as well as three different diameter ratios, namely 1.2, 1.5, and 2.0 and the Prandtl number varies from 0.7 to 10 are considered. The computed flow patterns and temperature fields are shown by means of streamlines and isotherms, respectively, and the average heat transfer coefficients are also presented. The numerical results are summarized by Nusselt number vs. Grashof number correlations with the Prandtl number and diameter ratio as a parameter. The results of the parametric study show that the diameter ratio and Grashof number have a profound influence on the temperature and flow field and they are almost independent of a low Prandtl number fluid. The average Nusselt number increases by 25% at large of diameter ratio and Prandtl number. Good agreement with earlier available data is obtained.