This paper gives information about different value added waste for preparation of activated carbon is used as adsorbent. There are different types of waste which can be converted into activated carbon by chemical activation using different activating agents like Cacl 2 , H 2 So 4 , H3Po4, KoH, and Zncl 2 .These activating agents are used by different investigators for activation of carbon prepared from waste at different performing conditions. Adsorption isotherms were developed by different authors with respect to their work.

Heat exchangers are used in a variety of industrial and technical settings. The design of heat exchangers is fairly sophisticated, since it necessitates an accurate study of heat transfer rate and pressure drop estimates, as well as considerations like as long-term performance and cost. Whenever heat transfer inserts are employyed, Along with the rise in heat transfer rate, the pressure drop increases as well. The pressure has risen.Energy conservation is critical for both industrial development and environmental impact reduction. Because of current energy prices, the need for energy conservation is rising. More resourceful gadgets can help reduce energy costs. In the refrigeration, automotive, chemical, and process sectors, heat exchangers are the most significant device. As a result, there is a demand in the industrial sector for heat exchangers that are less expensive, more efficient, and smaller. Inserts in channels are widely employed as part of a passive heat transfer augmentation technique.

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