Ali Khalid Shaker Al-Sayyab

Southern Technical University -Iraq | STU · Basra Engineering Technical College (BETC)

This work presents a theoretical study on the application of low global warming refrigerants as alternative refrigerant to R 134a in a refrigeration system. The refrigerants investigated are R1234yf, R1234ze, R245fa and R227ea. The performance characteristics of the refrigeration system were predicted using mathematical models running by using EES...

In this work, the effect of capillary tube diameter on refrigerator performance is studied for refrigerants R134a, R290, R600a and its mixture which named RMix1(70%R134a,20%R290,10%R600a), RMix2(70%R134a,10%R290,20%R600a),RMix3.(50%R134a,20%R290,30%R600a),RMix4 (60%R134a,20%R290,20%R600a). The three adopted capillary tubes diameter are 1.4 mm, 1.8...

The refrigerant R134a widely used in refrigerating and air conditioning units .It has zero ozone depilation potential factor (ODP) but have 1300 global warming potential (GWP) and their interaction with heat radiation. It is necessary to minimize the global warming, by changing R134a with the ones that are not depleting the ozone layer and very lit...

This study presents the impacts of suitable refrigerant charge to test the performance of laboratory refrigerator rig for using three refrigerants of (R134a, R600a and R290) instead of R12 .The coefficient of performance and maximum consumption amperes are taken as function to evaluate the optimum charge of these refrigerants. The results imply tha...

In this paper, an experiment has been conducted where additive materials have been added to heavy crude oil to improve transportation. This is done on a pipeline length of 186 km. During the experiment, materials will be added to the inner pipeline to lubricate the heavy crude oil fiber and reduce the pressure drop. The additive materials, which ar...

An efficient mobile air conditioning (MAC) system using a safe and climate-friendly refrigerant is necessary for human comfort, increases the vehicle's energy performance, and reduces fuel/electricity consumption. In the current work, we perform a drop-in experimental comparison for low GWP alternatives to R134a in reversible MAC systems. The study...

Using renewable heat energy sources, recovering the waste heat, and enhancing the processes and energy efficiency can reduce the electricity dependency of several industrial applications. Renewable and waste heat have a low-grade enthalpic level and should be combined with other technologies to bring it to a practical level. This could be achieved...

Internal heat exchangers (IHX) are commonly used to improve the energy performance of vapour compression refrigeration cycles. However, the magnitude of the improvement depends on the refrigerant and operational conditions. This paper experimentally investigates the influence of a high IHX on vapour compression systems. The new low global warming p...

This work analyses a novel combined organic Rankine-compound ejector vapour compression cycle for power, cooling and heating production using a low-grade ground heat source as the primary heat source. Ultra-low global warming potential working fluids (R1234ze(E), R1243zf, and R1234yf) and parameters quantifying energy and exergy efficiency are cons...

This article evaluates the energy and exergy performance of a novel dual fluid combined organic Rankine-compound ejector multi evaporators vapour compression system (ORCEMES) for power, cooling and heating purposes. Six working fluids with ultra-low global warming potential: R1234ze(E), R1243zf, R1234yf for the CEMES and R1234ze(Z), R1336mzz(Z) and...

A comprehensive techno-economic evaluation is evaluated based on an innovative compound ejector-heat pump system with PV/T (photovoltaic thermal) waste heat-driven. The aim of the system is simultaneous data centre cooling and waste heat recovery for district heating to reduce residential greenhouse gas emissions. The new system avoids the ejector...

This work presents an experimental comparison for low GWP refrigerants used in vapour compression cooling and heating systems. The study compares three lower global warming potential (GWP) refrigerants (R513A, R516A, and R1234yf) as drop-in refrigerants to replace the hydrofluorocarbon (HFC) R134a. Measurements are taken from a test rig at differen...

This work presents an energy, exergy, and environmental evaluation of a novel compound PV/T (photovoltaic thermal) waste heat driven ejector-heat pump system for simultaneous data center cooling and waste heat recovery for district heating networks. The system uses PV/T waste heat with an evaporative-condenser as a driving force for an ejector whil...

This work investigates the theoretical influence of the evaporating temperature on the performance of a compound waste heat-solar driven ejector-solar assisted heat pump. R450A and R513A are the alternative refrigerants to be compared to the hydrofluorocarbon R134a. The system recovers waste heat from PV/T (photovoltaic thermal) panels and a conden...

Heat Transfer, Fluid Mechanics and Thermodynamics

ATE-2021 conference

This paper is the consequence of a multi-year study investigating low Global Warming Potential (GWP) refrigerants to fulfil the European F-Gas Regulation requirements and follow up the greenhouse gas hydrofluorocarbon (HFC) reductions established by the Paris Agreement and Kigali Amendment, respectively. New single fluids added since 2013, and the...

This work focused on a compound PV/T waste heat driven ejector-heat pump system for simultaneous data centre cooling and waste heat recovery for district heating. The system uses PV/T waste heat as the generator’s heat source, acting with the vapour generated in an evaporative condenser as the ejector drive force. Conventional and advanced exergy a...

A heat transfer modeled for predicting the wall temperature of aeration tank in a biological wastewater treatment subsystem of Hamden station is presented. The method to treatment employed depending upon the pollutants in wastewater and extent to which it is desired to eliminate them in order to congregate required standards of water quality. Sever...

The energy extracted from the solar is changing cording to seasons and the way of tracking. In this study, have been five tracking modes are North-South and East-West, which have been rotating over the seasons of the year. Also, the Baghdad city has been chosen to select the optimum tracking mode. A mathematical pattern has been used to solve numer...

In this study, the performance of a window-type air-conditioning unit with an alternative, ozonefriendly refrigerant was enhanced by incorporating a nozzle instead of a capillary tube as an expansion device. An experimental evaluation was adopted on a 1.5 RT window-type air-conditioning unit with a controlled environmental zone. According to operat...

Energy and exergy analysis were carried out for ten TR multistage vapour compression cycles and a flash gas intercooler, with alternative refrigerants to R134a, namely R1234yf, R1234ze, R245fa, and R227ea. The condensing temperature varied from 40 to 50 o C, while the evaporator temperature remained constant at-10 o C. The irreversibility analysis...

This work includes a theoretical and experimental study to evaluate the effect of a photovoltaic cell tilted angle variation on the generated power of a photovoltaic cell, located in Basra city. In this study, to find an optimum tilted angle, without using the tracking system, a mathematical model is used that is programmed by Mat lab R218a. This m...

The performance of parabolic solar water heater is quite sensitive to the latitude, day of operation as well as the tracking mode. In this study a five different tracking mode are invited North -South rotate and East- West rotate over the four season of the year, and to perform the suitable one for using in Basra city an mathematical model was used...

This work was carried out to predict both the monthly and yearly optimum tilt angle for the photovoltaic cells that are located in Baghdad (latitude 33°20′), Diyala (33°14′), and Tikrit (34°35′). These Iraqi cities were selected based on their geographical location. Mathematical models were used and programmed by engineering equation solver, EES, t...

In this work, the performance of window-type air-conditioning units was improved. The study was achieved by adding a diffuser at the compressor outlet. An experimental investigation was carried out on 2 RT window-type air-conditioning units with controlled environmental zones. According to the compressor-outlet conditions, an ANSYS-fluent program w...

This study presents the theoretical modeling of solar water pumps, which can be useful work at the Sun days. The solar water pump it is a thermally driven pump which raised the water form the deep well by evaporating the Ethanol at the solar collector (parabolic heater), which in turn pumps the water to the top without any mechanical work. The mode...

AB S T RA C T In this study, a theoretical analysis is been carried for the application of the alternative refrigerant with low global warming to R22 in small air conditioning unit. The refrigerants investigation is R290, R600, R600a and R1270. The system mathematical models are running by using EES program .The results show that at any working con...

In this work, a performance study was achieved on air cooled condenser of an airconditioning unit. An experimental investigation was carried out on two condenser designs aided by a controlled environmental zone, which was designed and constructed for the current study. The effect of ambient air temperature on the condenser performance was studied b...

The performance of photovoltaic cell is affected by the value of its tilt angle with respect to horizontal plane, where the variation of tilt angle changes the amount of solar radiation permit to the photovoltaic cell surface. So that, the using of solar tracking system for photovoltaic cell will get the maximum solar radiation that permit to the s...

Photovoltaic cell need to be inclined at the optimum angle to maximize the receiving solar energy then maximize the out but electric power. In this study, the collector surface is assumed to be facing toward south, solar global radiation on a tilted surface was estimated using a mathematical model which programed in engineering equation solver EES...

Photovoltaic cell need to be inclined at the optimum angle to maximize the receiving solar energy then maximize the out but electric power. In this study, the collector surface is assumed to be facing toward south, solar global radiation on a tilted surface was estimated using a mathematical model which programed in engineering equation solver EES...

Photovoltaic cell need to be inclined at the optimum angle to maximize the receiving solar energy then maximize the out but electric power. In this study, the collector surface is assumed to be facing toward south, solar global radiation on a tilted surface was estimated using a mathematical model which programed in engineering equation solver EES...