Chapter 5, Problem 5.8DOEP

A Block has the potential to produce up to 3000 MWh of geothermal energy when the project is developed to completion. In the  region, the average geothermal temperature gradient is 20 °C/km, the maximum depth that can be reached using conventional drilling technology is 10 km, the average annual surface temperature is 25 °C and the rock under the surface in that region has a density of 2600 kg/m3 and a specific heat of 1000 J/kg.K. Determine the minimum mass of rock required to meet this demand.

Please give a detailed explanation, don't just give the existing solution. (Handwritten recommended)

p46,#13 with illustration and explanation

THERMODYNAMICS UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS. NO LONG EXPLANATION NEEDED. BOX THE FINAL ANSWER AND USE 3 DECIMAL PLACES. A rigid, perfectly insulated system contains 0.53m3 of helium at 1000 kPa. The system receives 1000 kJ of paddle work. Determine the final pressure. (ANSWER: 2256 kPa)

It is a hot day in Atlanta and you and your friends bought an ice cream maker. The unit consists of a bowl and a base that rotates the bowl around a stationary mixing paddle. The walls of the bowl contain an unknown mixture that absorbs heat from the ice cream. The bowl must be frozen (-20°C) before use. Unfortunately, your friends have lost the instructions and can't remember how long to operate the unit. You tell them not to worry since you have mastered energy conservation problems and can calculate the amount of time required to freeze the ice cream. Looking at the box, you find the specifications for the unit: a) Inner surface area of freezing bowl: 600 cm2; b) Heat transfer coefficient for bowl:h = 0.025 J / (cm2 s .°C); c) Power required to stir the bowl (100% efficiency):25 W; d) Amount of ice cream mixture added: 1 kg; e) The rate of heat transfer is between the bowl and the milk. You know that solutes lower the freezing point of water. Assume that the freezing point is…

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Show your correct and complete solution for this problem. Box your final answers and express in two decimal places. Sketch the schematic diagrams.

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One pound of air with an initial temperature of 200F is allowed to expand without flow between pressure of 90 and 15 psia. if the air is undergoing a process that follows pVn=n, where n=1, what is the heat transferred in BTU.