Research methods is a broad term. While methods of data collection and data analysis represent the core of research methods, you have to address a range of additional elements within the scope of your research.
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The equal friction method, as its name implies, is based on maintaining the. same pressure drop per unit of duct length (or friction rate) throughout the system (ACCA. 1990). The duct size is based on the flow rate through a particular section of duct, and design. value for the friction rate.