A boiler is used to heat steam at a brewery to be used invarious applications such as heating water to brew the beer andsanitizing the brewing tanks. 75.0% of the heat produced by theboiler is used to create saturated steam at 12.0 bars (absolute)from liquid water at 22Â° C. If 1.60*10^2 m3/h of steam is needed,what rate of heat does the boiler output?

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Jarrod RobelLv2

12 Jul 2019

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This Thermodynamics Lab is somewhat different from the norm. I have attached the Thermo lab that normally would be performed by the student for this Thermo class. Each student would be one of several in a small group of students taking their turn at performing an experiment on a single, small steam boiler. As may be read in the Lab Protocol, the experiment consists of measuring the temperature and pressure of the water as it is electrically heated from liquid water to vapor steam as a function of time. It is an interesting experiment BUT I think a more interesting experiment (even if it is only a Gedanken Experiment[1]) would be to transform this lab theme into a practical example. Iâve chosen a simple experiment that involves a 2 or 4-cup espresso coffee pot as a practical example of the heating and thus the pressurization of water in a closed vessel. The espresso coffee pot is used in homes and not in cafes where a more sophisticated steam generator is used to produce the rich espresso coffee (see Attachment No. 1 for âhuman interestâ story related to this coffee pot

[1] A Gedanken Experiment was often used in the early years of the 1900âs in physics by the Leaders of theoretical physics such as Bohr, Einstein, Madame Curie, Schrodinger, Heisenberg, et al. It consists of a simple sketch and a very basic thought experiment of ââ¦what would happen ifâ. It was often used when experimental apparatus was not yet available to actually do the experiment to test a hypothesis.

The coffee pot will be available for your inspection in class and the attached photo of an âexploded viewâ of the pot is offered for your review. If you have access of one of these pots, then your reward for actually doing the experiment will be to enjoy the coffee that is produced. However, this lab

can be completed as a simple âthought experimentâ with some calculations required.

By inspecting the attached sketch you will note that the pot is actually a closed vessel once the pot is filled with water, the coffee basket/strainer is filled with coffee, and the top is tightly screwed together with the bottom that is filled water. There is a pressure relief valve shown and a gasket on the top chamber that keeps a tight seal between the top and bottom halves. The heated fluid will be forced through the coffee strainer via the inverted spout that is submerged in the water. If the experiment is successful, the espresso coffee is found in the top chamber.

The âexperimentâ is essentially to answer the following questions. BUT, the Lab Report should present a professional summary of the experiment using a sketch and/or photo (from any source with appropriate credit given) and any necessary calculations that was performed in order to answer the question.

Question 1. Clearly and carefully describe the heating process with a concise written description of the process. It is suggested that the description will be easier to explain if it is accompanied by a sketch of the process on a P (or T) vs. v (specific volume). Try to sketch what you believe to be the shape of the temperature change of the pot and water vs. time for the entire process. Also indicate what could happen if the source of heat is not turned-off after the coffee is produced. What is the motive force that moves the cold water to the top chamber?

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