Question

Problem 2: Cool drinks on the beach (75 points) It's the week of Spring Break; after months of relentless snowstorms in Montreal and considerable suffering at McGill, you and your buddies are enjoying a few days of well-deserved R&R on the Florida coast. You brought six bottles of an age- appropriate drink to the beach, but forgot to put them in the refrigerator and you don't have a cooler. The bottles are now at ambient temperature (Tamb- 35°C or 308 K): you can either have your drink warm (in which case you will receive zero credit on this problem or use your newly-acquired knowledge of thermodynamics to determine what it would take to cool the bottles. There is a small refrigerator at the tiki bar; you put the bottles in the refrigerator and plug it in a power outlet. The bottles (including their liquid content) have a total mass of 3.1 kg and an average specific heat of 2900 J/kg-K. a) (10 Points) Taking the refrigerator (but not the bottles within) as the system, draw a black-box' schematic diagram showing all the energy transfers (including their sign) between the system and the environment (35 Points) Calculate the work transfer required by the refrigerator to cool the bottles to 5°C (278 K). In doing so, you may assume that the refrigerator has a COP which is only 70% the COP of a reversible refrigerator. You may also assume that the refrigerator itself is massless, therefore it does not store either energy or entropy. This implies that the temperature inside the refrigerator is equal to the temperature of the bottles at any given time during the process. b) c) (30 Points) Calculate the total entropy generated in the refrigerator during the process

Iam looking for the detailed solutions to this question. Absolute answers are given but Im looking for the step by step solutions with every step clearly explained. Thanks In advance..

Answer 1

Please find the attached detailed solution,do reply in case of any query.

Solucho Ave'ome specific heat _ 2900%,-K esmbient Re Electoical S CHet Output) System venv CHeat seleased by Sy stem Ve outpud lo we wos pd input 27 30g-273 9.266

Now, cop= Refnge oahon Effect Wosk Input 2 Re fa'gesation ect ta i n the tempe mture of bottles to 5 Het etcie oo hid Contert contemt using C),(2) & 26970 0 norkIn put Cop_一6.486二 6.426 581.86 Toles 41. 5819 lo Joud es

Enrtoo 30g K Energy balne effed 279k 3t281. g62 Tades goed = 311.282 AS 2697000-31128 tese lowe 278 30g sote Pace actually Refagromtoy sandi should be ydeseddWhple syg rtoo Sou ambient -308k

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