Peer Review

Sizing a Heat Exchanger: Double pipe, counter-Flow

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Effectiveness:

Ease of Use:

Overview:: The video presents how to calculate the length of a concentric, counter flow heat exchanger using an overall heat transfer coefficient and the log mean temperature. The content matches the heat transfer concepts one can find in most part of heat transfer handbooks for engineering teaching. It describes how counter-flow is different from parallel flow. The video could be integrated very easily in most basic courses on heat transfer for engineers, as a stand-alone activity.
Type of Material:: Video presentation
Recommended Uses:: It could be recommended as a basic self-learning or homework tool on heat transfer engineering courses.
Technical Requirements:: Chrome v 79, Mozilla Firefox v 68.0.1, Cool Novo and Microsoft edge are valid to watch the video.
Identify Major Learning Goals:: The user will develop a basic understanding of the method used to size a double pipe, counter flow heat exchanger by the overall heat transfer coefficient method. The presentation takes into account the differences in the calculation of the delta T log mean between a counter flow and a parallel flow heat exchangers.The video allows both the qualitative and the quantitative approach of engineering calculations.
Target Student Population:: High School, College Upper Division, First level of undergraduate courses, Professional.
Prerequisite Knowledge or Skills:: It is necessary to have previous knowledge on physics and mathematics at high-school level.

Rating:
Strengths:: The overall heat transfer coefficient method is clearly stated and developed by means of an example. It presents a paced step by step example, covering the main concepts of double pipe heat exchangers. Hypothesis of calculations are clearly stated.
Concerns:: The contents require previous knowledge on conduction and convection heat transfer to be understandable. It could be interesting to provide information on how to calculate convection coefficients for both the two fluids, since these values may vary depending on several properties (temperature, viscosity, speed of flow…).

Rating:
Strengths:: The material could be used for self-learning as well as a supplementary material in traditional or blended courses. The video presentation demonstrates how to apply the overall heat transfer method for sizing heat exchangers, frequently used in heat transfer engineering handbooks. The material could be also effective when used with undergraduate students that begin to learn about heat exchangers. The learning objective is clearly stated.
Concerns:: Students should have prior knowledge on how to calculate the overall heat transfer coefficient, as well as knowledge on convection and convection coefficients calculation. The video presents only one example. It has to be complemented with further assessment activities to be integrated as a full learning tool.

Rating:
Strengths:: The presentation is very clear and engaging. Because the speaker speaks slow, this presentation could be easily followed by medium-level English students. No need of instructions of use, YouTube repository. Heat exchanger calculations are presented in a linear sequence, as in most engineering textbooks, which mean a reinforced coherence.
Concerns:: No interactivity with the user. Direct, straight presentation. Visual appealing is low, as it reproduces the same appearance of the blackboard in the traditional classroom.

Other Issues and Comments:: Very good material, both for students and for teachers to learn / teach the main concepts concerning counter flow heat exchanger calculations. The video presentation could be recommended as a basic tool on double pipe heat exchanger issue for those persons with a basic knowledge of heat transfer. The material could be used for self-learning or homework, but it should be complemented with assessment activities. The quality of contents is correct and addresses core concepts of basic undergraduate engineering courses. Very adequate for mechanical and chemical engineering students.
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