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Chemistry Assignment: Heat Exchange Analysis

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Added on  2020-05-28

Chemistry Assignment: Heat Exchange Analysis

   Added on 2020-05-28

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Chemistry Assignment: Heat Exchange Analysis_1
Heat exchange analysisHeat exchanger is a piece of equipment which helps in transferring thermal energy between two or more fluids which happens to be at different temperatures. The heat exchangers are used in heating and also in air conditioning applications. Also the devices are also applied in industries such as chemical and food industries as well as electrical power generation. In addition, heat exchangers are also applied in everyday activities on activities such as hot water radiations and also car cooling systems. High temperature exchangers are frequently employed for preheating combustion air for industrial burners. The design of heat exchangers is critical to enhance their effectiveness of heat and pressure transfer. In the design, the diameter and length of the heat exchanger devices are important to enhance the effectiveness of the devices. This project was able to focus on the design of twin-tube counter flow heat exchanger. The major conditions on this device are that it works to balance flow rates between the cold and hot air streams. In addition, during the design, the walls of the device were believed to act as fins and have an efficiency of 100%. Another key assumption which was made is that the average pressure of the air stream was taken to be 1 atm. In addition, the maximum allowable pressure drop for the cold air was 10 Kpa. The temperature for the cold air was taken to be 280 K and it was to be increasedto 340 K through the use of hot air stream of 360 K. Other key assumptions which were used during the design include steady-state conditions. In addition heat losses to the surrounding were assumed to be negligible and the flow was fully developed. The design process was meant to determine the appropriate diameter D and length T for the twin-tube counter flow heat exchanger. In the aim to achieve at the best dimension of heat exchanger, two key specification methods for the diameter D and length L were recommended which was done through the method which
Chemistry Assignment: Heat Exchange Analysis_2
involved heat transfer based upon the effectiveness-NTU method. This method involved cold air heating requirement the second step involved was the calculation of pressure drop which was applied on the 10 Kpa pressure requirement. In the design process, the effectiveness was determined first and then pressure drop was used to determine the D and L parameters. The following diagram represents the key dimensional and characteristics which were used during thedesign process of the heat exchangers in this process. During the design, thermal considerations were made to be important and the shell thermal design and tube heat exchangers were considered. The first thing in the design was to find the energy balance between the two conditions available. The heat transfer balance and effectivenesswas achieved from the conditions that Cmin = Cmax and Cr = 1. The effectiveness ε is the ratio of the actual heat transfer rate and the maximum possible heat transfer rate, which is given inform of the flow and temperature conditions within the heat exchanger. Substituting the values in the following equation,Effectiveness, ε=qqmax=C(Tc,oTc,i)C(Th,iTc,i)=(340280)(360280)=0.75
Chemistry Assignment: Heat Exchange Analysis_3

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