A refrigerator works in large part by allowing a medium to circulat...

Question
A refrigerator works in large part by allowing a medium to circulate continuously in a system with a compressor and an expansion valve. Between the compressor and the expansion valve (in the flow direction), the system has high pressure and the refrigerant condenses. The pressure between the expansion valve and the compressor is lower and the medium evaporates. The medium used may be, for example, isobutane, tetrafluoroethane, ammonia, or dichlorodifluoromethane (Freon).

In this case, tetrafluoroethane (R134a) is used as a refrigerant. The brine is saturated when it reaches the compressor (Hˆ1 = 249 kJ / kg) and after compression the gas is overheated (Hˆ2 = 273 kJ / kg). When R134a leaves the condenser, the liquid is saturated with a specific enthalpy of 91.5 kJ / kg and the enthalpy is constant during expansion in the valve.

• a) Draw a schematic picture of your refrigerator. Select where heat is absorbed and emitted respectively. Where do you place your refrigerator?

• b) The refrigerator has an annual energy consumption of 360 kWh / year which is used to operate the compressor. Calculate the refrigerant flow rate (kg / s) and the maximum cooling power (kW) that the refrigerator has, i.e. the heat that can be absorbed from the cooling compartment. Suppose the compressor and valve operate adiabatically and neglect kinetic and potential energy changes.

The solution should include a schematic image of the refrigerator with marked heat flows as well as relevant connections and balances. The calculation process should be clear.
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      • Illuminate\Database\Events\QueryExecuted (1.04ms)
      • eloquent.retrieved: App\Models\SubjectCat (116μs)
      • Illuminate\Cache\Events\KeyWritten (1.35ms)
      • Illuminate\Cache\Events\CacheHit (286μs)
      • Illuminate\Cache\Events\CacheHit (228μs)
      • Illuminate\Cache\Events\CacheHit (171μs)
      • Illuminate\Cache\Events\CacheHit (334μs)
      • Illuminate\Cache\Events\CacheHit (386μs)
      • Illuminate\Cache\Events\CacheHit (210μs)
      • Illuminate\Cache\Events\CacheHit (307μs)
      • Illuminate\Cache\Events\CacheHit (554μs)
      • Illuminate\Cache\Events\CacheHit (195μs)
      • Illuminate\Cache\Events\CacheHit (186μs)
      • Illuminate\Cache\Events\CacheHit (165μs)
      • Illuminate\Cache\Events\CacheHit (294μs)
      • Illuminate\Cache\Events\CacheHit (176μs)
      • Illuminate\Cache\Events\CacheHit (185μs)
      • Illuminate\Cache\Events\CacheHit (161μs)
      • Illuminate\Cache\Events\CacheHit (183μs)
      • Illuminate\Cache\Events\CacheHit (148μs)
      • creating: site.layouts.app (834μs)
      • composing: site.layouts.app (20μs)
      • creating: components.canonical (895μs)
      • composing: components.canonical (108μs)
      • creating: components.open-graph (392μs)
      • composing: components.open-graph (92μs)
      • creating: site.headers.header (329μs)
      • composing: site.headers.header (80μs)
      • Illuminate\Cache\Events\CacheHit (2.04ms)
      • creating: components.footer (98μs)
      • composing: components.footer (99μs)
      • Illuminate\Cache\Events\CacheHit (1.07ms)
      • Illuminate\Cache\Events\CacheMissed (380μs)
      • Illuminate\Database\Events\StatementPrepared (980μs)
      • Illuminate\Database\Events\QueryExecuted (1000μs)
      • eloquent.retrieved: App\Models\SubjectCat (99μs)
      • Illuminate\Cache\Events\KeyWritten (423μs)
      • Illuminate\Cache\Events\CacheHit (287μs)
      • Illuminate\Cache\Events\CacheHit (139μs)
      • Illuminate\Cache\Events\CacheHit (201μs)
      • Illuminate\Cache\Events\CacheHit (153μs)
      • Illuminate\Cache\Events\CacheHit (123μs)
      • Illuminate\Cache\Events\CacheHit (395μs)
      • Illuminate\Cache\Events\CacheHit (325μs)
      • Illuminate\Cache\Events\CacheHit (202μs)
      • Illuminate\Cache\Events\CacheHit (358μs)
      • Illuminate\Cache\Events\CacheHit (206μs)
      • Illuminate\Cache\Events\CacheHit (349μs)
      • Illuminate\Cache\Events\CacheHit (251μs)
      • creating: components.forms.contact-us (490μs)
      • composing: components.forms.contact-us (202μs)
      • creating: components.forms.get-started (200μs)
      • composing: components.forms.get-started (103μs)
      • creating: components.forms.free-tool-download (158μs)
      • composing: components.forms.free-tool-download (78μs)
      • creating: components.forms.claim-free-worksheet (183μs)
      • composing: components.forms.claim-free-worksheet (79μs)
      • creating: components.forms.tutor-subscription-waitlist (143μs)
      • composing: components.forms.tutor-subscription-waitlist (706μs)
      • creating: components.forms.tutor-subscription-join (163μs)
      • composing: components.forms.tutor-subscription-join (63μs)
      • creating: components.forms.tutor-support (133μs)
      • composing: components.forms.tutor-support (72μs)
      • 312 x Illuminate\Cache\Events\CacheHit (17.82%)
        114ms
        19 x Illuminate\Database\Events\StatementPrepared (5.94%)
        38.14ms
        19 x Illuminate\Database\Events\QueryExecuted (4.49%)
        28.84ms
        10 x Illuminate\Cache\Events\KeyWritten (1.65%)
        10.61ms
        1 x Illuminate\Foundation\Events\LocaleUpdated (0.93%)
        6.00ms
        1 x eloquent.booting: App\Models\HomeworkLibrary\HomeworkLibraryFile (0.93%)
        5.94ms
        2 x eloquent.retrieved: App\Models\Subject (0.92%)
        5.89ms
        10 x Illuminate\Cache\Events\CacheMissed (0.55%)
        3.54ms
        1 x Illuminate\Database\Events\ConnectionEstablished (0.31%)
        2.02ms
        1 x Illuminate\Routing\Events\Routing (0.27%)
        1.77ms
        11 x eloquent.retrieved: App\Models\SubjectCat (0.21%)
        1.38ms
        1 x Illuminate\Routing\Events\RouteMatched (0.16%)
        998μs
        1 x eloquent.booting: App\Models\SubjectCat (0.14%)
        910μs
        1 x creating: components.canonical (0.14%)
        895μs
        1 x creating: site.layouts.app (0.13%)
        834μs
        8 x eloquent.retrieved: App\Models\HomeworkLibrary\HomeworkLibraryFile (0.12%)
        766μs
        1 x composing: components.forms.tutor-subscription-waitlist (0.11%)
        706μs
        1 x eloquent.booted: App\Models\HomeworkLibrary\HomeworkLibrary (0.09%)
        601μs
        1 x eloquent.booting: App\Models\HomeworkLibrary\HomeworkLibrary (0.08%)
        507μs
        1 x creating: components.forms.contact-us (0.08%)
        490μs
        1 x creating: components.open-graph (0.06%)
        392μs
        1 x creating: site.headers.header (0.05%)
        329μs
        1 x creating: components.breadcrumbs (0.04%)
        288μs
        1 x creating: homework.show (0.04%)
        271μs
        7 x eloquent.retrieved: App\Models\HomeworkLibrary\HomeworkLibrary (0.04%)
        253μs
        1 x composing: components.forms.contact-us (0.03%)
        202μs
        1 x creating: components.forms.get-started (0.03%)
        200μs
        1 x creating: components.forms.claim-free-worksheet (0.03%)
        183μs
        1 x eloquent.booted: App\Models\HomeworkLibrary\HomeworkLibraryFile (0.03%)
        176μs
        1 x creating: components.forms.tutor-subscription-join (0.03%)
        163μs
        1 x creating: components.forms.free-tool-download (0.02%)
        158μs
        1 x creating: components.forms.tutor-subscription-waitlist (0.02%)
        143μs
        1 x creating: components.forms.tutor-support (0.02%)
        133μs
        1 x composing: components.breadcrumbs (0.02%)
        125μs
        1 x composing: homework.show (0.02%)
        110μs
        1 x composing: components.canonical (0.02%)
        108μs
        1 x composing: components.forms.get-started (0.02%)
        103μs
        1 x eloquent.booted: App\Models\SubjectCat (0.02%)
        99μs
        1 x composing: components.footer (0.02%)
        99μs
        1 x creating: components.footer (0.02%)
        98μs
        1 x composing: components.open-graph (0.01%)
        92μs
        1 x composing: site.headers.header (0.01%)
        80μs
        1 x composing: components.forms.claim-free-worksheet (0.01%)
        79μs
        1 x composing: components.forms.free-tool-download (0.01%)
        78μs
        1 x composing: components.forms.tutor-support (0.01%)
        72μs
        1 x eloquent.booted: App\Models\Subject (0.01%)
        63μs
        1 x composing: components.forms.tutor-subscription-join (0.01%)
        63μs
        1 x eloquent.booting: App\Models\Subject (0.01%)
        59μs
        1 x composing: site.layouts.app (0%)
        20μs
      14 templates were rendered
      • 1x homework.showshow.blade.phpblade
      • 1x components.breadcrumbsbreadcrumbs.blade.phpblade
      • 1x site.layouts.appapp.blade.phpblade
      • 1x components.canonicalcanonical.blade.phpblade
      • 1x components.open-graphopen-graph.blade.phpblade
      • 1x site.headers.headerheader.blade.phpblade
      • 1x components.footerfooter.blade.phpblade
      • 1x components.forms.contact-uscontact-us.blade.phpblade
      • 1x components.forms.get-startedget-started.blade.phpblade
      • 1x components.forms.free-tool-downloadfree-tool-download.blade.phpblade
      • 1x components.forms.claim-free-worksheetclaim-free-worksheet.blade.phpblade
      • 1x components.forms.tutor-subscription-waitlisttutor-subscription-waitlist.blade.phpblade
      • 1x components.forms.tutor-subscription-jointutor-subscription-join.blade.phpblade
      • 1x components.forms.tutor-supporttutor-support.blade.phpblade
      uri
      GET college-homework-library/{category}/{subject}/{id}
      middleware
      web, utm.parameters
      controller
      App\Http\Controllers\HomeworkLibraryController@show
      namespace
      where
      as
      homework.show
      file
      app/Http/Controllers/HomeworkLibraryController.php:79-176
      19 statements were executed, 5 of which were duplicates, 14 unique. Show only duplicated40.65ms
      • Connection Establishedtwenty4_siteHomeworkLibraryController.php#91
        Backtrace
        • 13. app/Http/Controllers/HomeworkLibraryController.php:91
        • 14. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 15. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 16. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `solutionslibrary` where `status` = 'published' and `price` > 0 and `solutionslibrary`.`id` = '61809' limit 1
        9.22mstwenty4_siteHomeworkLibraryController.php#97
        Bindings
        • 0: published
        • 1: 0
        • 2: 61809
        Backtrace
        • 16. app/Http/Controllers/HomeworkLibraryController.php:97
        • 17. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 18. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 19. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 20. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `subjects` where `subjects`.`id` in (269)
        1.68mstwenty4_siteHomeworkLibraryController.php#97
        Backtrace
        • 21. app/Http/Controllers/HomeworkLibraryController.php:97
        • 22. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 23. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 24. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 25. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` in (61809)
        4.94mstwenty4_siteHomeworkLibraryController.php#97
        Backtrace
        • 21. app/Http/Controllers/HomeworkLibraryController.php:97
        • 22. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 23. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 24. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
        • 25. vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
      • select * from `subject_cats` where `subject_cats`.`id` = 34 limit 1
        4.53mstwenty4_siteHomeworkLibrary.php#201
        Bindings
        • 0: 34
        Backtrace
        • 20. app/Models/HomeworkLibrary/HomeworkLibrary.php:201
        • 26. app/Http/Controllers/HomeworkLibraryController.php:105
        • 27. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
        • 28. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
        • 29. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
      • select * from `solutionslibrary` where `id` <> 61809 and `subject` = 269 and `status` = 'published' and `price` > 0 order by RAND() limit 6
        3.63mstwenty4_siteHomeworkLibraryRepository.php#30
        Bindings
        • 0: 61809
        • 1: 269
        • 2: published
        • 3: 0
        Backtrace
        • 14. app/Repositories/HomeworkLibraryRepository.php:30
        • 15. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 16. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 18. app/Repositories/HomeworkLibraryRepository.php:39
        • 19. app/Http/Controllers/HomeworkLibraryController.php:139
      • select * from `subjects` where `subjects`.`id` in (269)
        1.04mstwenty4_siteHomeworkLibraryRepository.php#30
        Backtrace
        • 19. app/Repositories/HomeworkLibraryRepository.php:30
        • 20. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 21. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 23. app/Repositories/HomeworkLibraryRepository.php:39
        • 24. app/Http/Controllers/HomeworkLibraryController.php:139
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` = 61809 and `solutionslibrary_files`.`solutionlib_id` is not null and `publish` = 'question' order by `order` asc, `id` asc
        1.15mstwenty4_siteHomeworkLibrary.php#260
        Bindings
        • 0: 61809
        • 1: question
        Backtrace
        • 15. app/Models/HomeworkLibrary/HomeworkLibrary.php:260
        • 16. app/Transformers/HomeworkLibrary/HomeworkLibraryTransformer.php:58
        • 19. vendor/league/fractal/src/TransformerAbstract.php:128
        • 20. vendor/league/fractal/src/TransformerAbstract.php:107
        • 21. vendor/league/fractal/src/Scope.php:383
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` = 61809 and `solutionslibrary_files`.`solutionlib_id` is not null and `publish` = 'teaser' order by `order` asc, `id` asc
        1.06mstwenty4_siteHomeworkLibrary.php#260
        Bindings
        • 0: 61809
        • 1: teaser
        Backtrace
        • 15. app/Models/HomeworkLibrary/HomeworkLibrary.php:260
        • 16. app/Transformers/HomeworkLibrary/HomeworkLibraryTransformer.php:69
        • 19. vendor/league/fractal/src/TransformerAbstract.php:128
        • 20. vendor/league/fractal/src/TransformerAbstract.php:107
        • 21. vendor/league/fractal/src/Scope.php:383
      • select * from `solutionslibrary_files` where `solutionslibrary_files`.`solutionlib_id` = 61809 and `solutionslibrary_files`.`solutionlib_id` is not null and `publish` = 'solution' order by `order` asc, `id` asc
        1.14mstwenty4_siteHomeworkLibrary.php#260
        Bindings
        • 0: 61809
        • 1: solution
        Backtrace
        • 15. app/Models/HomeworkLibrary/HomeworkLibrary.php:260
        • 16. app/Transformers/HomeworkLibrary/HomeworkLibraryTransformer.php:80
        • 19. vendor/league/fractal/src/TransformerAbstract.php:128
        • 20. vendor/league/fractal/src/TransformerAbstract.php:107
        • 21. vendor/league/fractal/src/Scope.php:383
      • select * from `subject_cats` where `subject_cats`.`id` = 34 limit 1
        1.85mstwenty4_siteHomeworkLibrary.php#201
        Bindings
        • 0: 34
        Backtrace
        • 20. app/Models/HomeworkLibrary/HomeworkLibrary.php:201
        • 32. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
        • 33. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
        • 34. vendor/livewire/livewire/src/ComponentConcerns/RendersLivewireComponents.php:69
        • 35. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:70
      • select * from `subject_cats` where `subject_cats`.`id` = 3 limit 1
        1.2mstwenty4_siteSubject.php#100
        Bindings
        • 0: 3
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 4 limit 1
        1.3mstwenty4_siteSubject.php#100
        Bindings
        • 0: 4
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 10 limit 1
        1.07mstwenty4_siteSubject.php#100
        Bindings
        • 0: 10
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 33 limit 1
        1mstwenty4_siteSubject.php#100
        Bindings
        • 0: 33
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 11 limit 1
        1.2mstwenty4_siteSubject.php#100
        Bindings
        • 0: 11
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 5 limit 1
        1.03mstwenty4_siteSubject.php#100
        Bindings
        • 0: 5
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 34 limit 1
        1.27mstwenty4_siteSubject.php#100
        Bindings
        • 0: 34
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 31 limit 1
        1.19mstwenty4_siteSubject.php#100
        Bindings
        • 0: 31
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 34. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:110
      • select * from `subject_cats` where `subject_cats`.`id` = 36 limit 1
        1.15mstwenty4_siteSubject.php#100
        Bindings
        • 0: 36
        Backtrace
        • 18. app/Models/Subject.php:100
        • 19. vendor/laravel/framework/src/Illuminate/Cache/Repository.php:397
        • 20. vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php:419
        • 22. app/Models/Subject.php:101
        • 28. view::components.footer:170
      App\Models\SubjectCat
      11SubjectCat.php
      App\Models\HomeworkLibrary\HomeworkLibraryFile
      8HomeworkLibraryFile.php
      App\Models\HomeworkLibrary\HomeworkLibrary
      7HomeworkLibrary.php
      App\Models\Subject
      2Subject.php
          _token
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          utm_source
          direct
          redirectUrl
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          _previous
          array:1 [ "url" => "https://staging.dev.24houranswers.com/college-homework-library/Physics/Thermod...
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          PHPDEBUGBAR_STACK_DATA
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          path_info
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          status_code
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          status_text
          OK
          format
          html
          content_type
          text/html; charset=UTF-8
          request_query
          []
          
          request_request
          []
          
          request_headers
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          request_cookies
          []
          
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