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Because of its potential to directly transform solar energy into heat and energy, without harmful environmental effects such as greenhouse gas emissions. Hybrid nanofluid is an efficient way to improve the thermal efficiency of solar systems using a possible heat transfer fluid with superior thermo-physical properties. The object of this paper is the study the latest developments in hybrid applications in the fields of solar energy systems in different solar collectors. Hybrid nanofluids are potential fluids with better thermo-physical properties and heat transfer efficiency than conventional heat transfer fluids (oil, water, ethylene glycol) with single nanoparticle nanofluids. The research found that a single nanofluid can be replaced by a hybrid nanofluid because it enhances heat transfer. This work presented the recent developments in hybrid nanofluid preparation methods, stability factors, thermal improvement methods, current applications, and some mathematical regression analysis which is directly related to the efficiency enhancement of solar collector. This literature revealed that hybrid nanofluids have a great opportunity to enhance the efficiency of solar collector due to their noble thermophysical properties in replace of conventional heat transfer working fluids. Finally, some important problems are addressed, which must be solved for future study.

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Bangladesh has made a tremendous contribution to RMG (Ready Made Garment) sector since the 1970s. Textiles and apparels consider for about 85% of the total export earnings of Bangladesh. Though it’s quite difficult to mete out the dimension of performance and objection of the RMG sector in Bangladesh but to fulfill the task this study has made a search based on the study of attainable documents. The beauty of this study lies in its way of narration, a sequential way of description. The study discovers that since its inception, the RMG industry contributed significantly to our economy especially during the last three decades. The cross-check analysis has been conducted to compare the last three decades’ export of RMG, specific garments export, GDP, market share, etc to get a lucid idea of the business trend of the RMG industry. These initiatives focus more on the establishment of sound structure, skilled manpower, enhanced market access, access to finance at the competitive interest rate, adaptation with advanced technology as well as institutional development. Therefore, both public and private sectors need to take several preliminaries, independently and collaboratively to overcome these challenges. Moreover, to take control and reserve the golden share of RMG, assured branding needs to be expansive.

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The aim of this experimental research study is to evaluate the thermal behaviour of crystal nanocellulose (CNC) nanofluids. Aqueous ethylene glycol (60: 40; W: EG) used as base fluid and 0.1%, 0.3% and 0.5% volume concentrations were designated here. Crystal nanocellulose nanofluids were prepared by two-step method. Thermal conductivity, viscosity, density, specific heat capacity and pH were assessed with standard measurement method and equipment. In this present work, thermal conductivity of 0.3% CNC nanofluids was increased of about 25% at 80 0 c; viscosity decreased; 0.1% nanofluid exhibit lowest viscosity performance at 80 0 c. In addition to this, 0.5% CNC nanofluid performed better declination of specific heat with increasing temperature up to 70 0 C and lowest error percentage in density measurement. However, some data of the experiments were distracted.