Proceeding Published in MIE http://103.99.128.19:8080/xmlui/handle/123456789/100 2026-04-09T19:32:24Z 2026-04-09T19:32:24Z Pramanik, Md Masum Rana Hridoy, Monowar Wadud http://103.99.128.19:8080/xmlui/handle/123456789/397 2024-03-12T05:36:58Z 2020-12-19T00:00:00Z

Title: The Influences of the Burnable Absorber (UO2+Gd2O3) on VVER-1200 Fuel Assembly Authors: Pramanik, Md Masum Rana; Hridoy, Monowar Wadud Abstract: Burnable absorber rods (UO2+Gd2O3) and chemical shim are the main control poisons that are used in the core for improving the reactor behavior and satisfying the safety criteria during the core life time. These absorbers (Gd2O3) have several constraints, criteria, and advantages and also disadvantages from the safety and operation points of view; and these characteristics depend on the concentration and distribution of mentioned poisons in the reactor core. In this study, the influences of the burnable absorbers (Gd2O3) on the main parameters of the reactor such as multiplication factor (Keff), neutron flux and burnup over the reactor life time are investigated. Monte Carlo Serpent code is used to design a three dimensional model for VVER-1200 assembly. The VVER-1200 assembly is loaded in different operation process with 8.0% Gd2O3 as integral burnable absorbers (IBAs). Burnable absorber rods (UO2+Gd2O3) are used in two rings in reactor core, one is central rings with low percentage of absorber (Gd2O3) due to low neutron flux in central part of core, and another is peripheral ring with high percentage of absorber (Gd2O3) because of high neutron flux in peripheral part of core. In this article, optimal position of absorbers (Gd2O3) and optimal amount of absorbers (Gd2O3) in VVER-1200 core are calculated. The strong influence of the burnable absorbers (BAs) composition and their location in the fuel elements on the dependence of the multiplication factor on fuel burnup is shown.

2020-12-19T00:00:00Z Hridoy, Monowar Wadud Mohammad, Mahathir Islam, Saiful Hakim, Md. Masbah-Ul Kadir, C.H.M Imran http://103.99.128.19:8080/xmlui/handle/123456789/396 2024-03-12T05:36:10Z 2020-12-19T00:00:00Z

Title: Experimental Investigation on Traditional Fan Performance Improvement using Front Mounted Cooling Coil of Vapor Compression Refrigeration System Authors: Hridoy, Monowar Wadud; Mohammad, Mahathir; Islam, Saiful; Hakim, Md. Masbah-Ul; Kadir, C.H.M Imran Abstract: The temperature of the world is increasing day by day and the effects of this warming are influential in Bangladesh. A record amount of temperature is rising every year. So, in this situation to work and live comfortably in the hot summer season it is necessary to have cooling devices. In Bangladesh, for the cooling purpose, most of the peoples generally use a traditional fan. Only a few of them are capable to buy Air Conditioner because a major portion of its peoples is poor. But only a fan sometimes is not enough to cool. So, the problem remains between cost and comfort. Considering this issue, a solution is proposed in this work which may serve both the problems. The problem could be solved if a cooling coil is placed on the path of air flow. When the incoming air is passed through the cooling coil it gets cool. The cooling coil is activated by the Vapor compression refrigeration Cycle. This system also made portable. That is, one may call this system a portable air cooler. For this cooling coil 50 feet, a copper tube is used. A 320-watt compressor and fin type condenser are used to construct the vapor compression system. This cooling is used for spot cooling for a periodic basis. A 3.5ºC temperature reduction has been found where the inlet and outlet temperature of the air is 25ºC and 21.5ºC respectively.

2020-12-19T00:00:00Z Hridoy, Monowar Wadud Khan, Shawkut Ali Ahmad, Rana Rahman, Md. Abdur Kadir, C.H.M. Imran http://103.99.128.19:8080/xmlui/handle/123456789/395 2024-03-12T05:35:33Z 2020-12-19T00:00:00Z

Title: Experimental Analysis of Heat Transfer Improvement of Water Utilizing Double Counter Twisted Tape Insert Authors: Hridoy, Monowar Wadud; Khan, Shawkut Ali; Ahmad, Rana; Rahman, Md. Abdur; Kadir, C.H.M. Imran Abstract: This investigation was done for improving tube side heat transfer execution by double counter twisted tape insert. The test segment comprises of a long copper tube of 26.6 mm inlet diameter and 30 mm external diameter and length was 900 mm. The inserts were 850 mm in long, 8.5 mm in width, 1.5 mm in thickness and twist ratio was 6.25. Two thermometers were utilized at the inlet and outlet segment of the circular tube for estimating the bulk temperature. Five K type thermocouples were utilized in the test area to estimate the outer surface temperature. From rotameter, a certain amount of mass flow rate was estimated for calculation of water flow velocity. Just as from manometer reading, pressure head was estimated for measuring the pressure difference of the flow segment. After measuring all the parameter values, Reynolds Number, heat transfer rate, convective heat transfer coefficient, Nusselt Number, Prandtl Number, experimental friction factor was calculated. At comparable Reynold number 2960 to 5382 Nusselt Number was increased by 60.5% to 70.8% for double counter twisted tape insert compared to plain tube. At comparable Reynold number 2960 to 5382 friction factor of the insert was also increased 1.05 to 1.37 times compared to plain tube. From previous data of segmented twisted tape there showed a comparison of Nusselt number of Double counter twisted tape (31.6 to 42.6) which is higher than the segmented twisted tape (20 to 37) at same Reynold number 2960 to 5382.

2020-12-19T00:00:00Z Hridoy, Monowar Wadud Hossan, Md. Nahid Kadir, C.H.M. Imran Sarkar, Deepok Kumar Ahmad, Rana http://103.99.128.19:8080/xmlui/handle/123456789/393 2024-03-12T05:32:37Z 2020-12-19T00:00:00Z

Title: Design and Cost Estimation of an Economic Air Blast Freezer Authors: Hridoy, Monowar Wadud; Hossan, Md. Nahid; Kadir, C.H.M. Imran; Sarkar, Deepok Kumar; Ahmad, Rana Abstract: Air blast freezer is the technology of rapidly freezing food to its desired storage temperature. This quick-freezing form very small crystals of ice which do not rupture the preserved food’s cells when melts and thus ensures the taste and texture of food being unaffected. This paper presents economic design of an air blast freezer considering preservation of 1000 kg poultry meat from 25oC to -18oC within 4 hours, selection of necessary equipment, cooling load calculation and finally a calculation of BOQ (Bill of Quantity). A very simple design was selected that could be made by locally available low-cost material and could be fabricated and installed by local technicians. The proposed design minimizes the complication in structure and best equipment for best performance is tried to select. The estimated cost for the proposed design and equipment is found lower than the existing system of same capacity.

2020-12-19T00:00:00Z