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Ако желаете да допринесете за превеждането на Академията: http://khanacademybulgaria.wordpress.com/</text>
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Съдържанието е със свободен достъп за некомерсиални цели, като при използване е необходимо да се посочва изрично източник сайта или канала и автор Кан Академия. Съдържанието на партньорските на Кан Академия организации с видеа на сайта и в канала на Кан Академия също е със свободен достъп, но е необходимо изричното посочване на притежателя на правата, особено за съдържанието по физика, музика, философия и медицина. Нито една част от съдържанието на сайта и канала на Кан Академия не може да се използва за генериране на приходи, ресурсите са и завинаги ще са със свободен достъп.&#13;
Сайт на български: https://bg.khanacademy.org &#13;
YouTube канал: https://www.youtube.com/c/khanacademybulgarian</text>
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                    <text>ВЪЗМОЖНОСТИ ЗА РЕШАВАНЕ НА ЕКОЛОГИЧНИТЕ
ПРОБЛЕМИ, СВЪРЗАНИ С ТОПЛИННОТО ЗАМЪРСЯВАНЕ
Нашето общо бъдеще е устойчивото развитие – развитие, което удовлетворява
нуждите ни сега, но без да подлага на риск способността на бъдещите
поколения да задоволяват своите нужди. Хората днес трябва да се съобразяват с
ограничеността на природните ресури. Само така може да се запази Земята ни за
сегашното и бъдещите поколения.
В каква насока трябва да са усилията ни?
Важно е да се намали топлинното замърсяване,
да се използват пестеливо природните ресурси,
да се предпиемат действия за възстановяване на
увредената от човешката дейност околна среда.
Потреблението на петрол трябва да бъде
ограничено. Затова производителите на автомобили
разработват и конструират все по-икономични и
щадящи околната среда превозни средства.
Такива са хибридните автомобили. Те имат и двигател с
вътрешно горене, и електродвигател. Това осигурява ниска
консумация на гориво и намаляване количествата на отделените вредни газове.
При някои от хибридните автомобили електродвигателят е помощник на
двигателя с вътрешно горене. Последните модели хибридни автомобили могат да
изминат определен пробег (над 100 км) изцяло на електрическа енергия.
Бъдещето принадлежи на хибридните автомобили. Например един
съвременен мощен двигател с хибридно задвижване има среден разход на гориво
от 3 L за 100 км... Това е непосилно за другите автомобили!
Друг начин за намаляване на топлинното замърсяване е използването на
слънчевата енергия за осигуряване на топла вода и отопление.
Елементите на „слънчевата архитектура“, като големи прозорци, масивни
слънчеви стени, осигуряват естественото осветление на големи сгради
– училища, административни сгради и други. Слънчевата енергия не се
преобразува в топлина, но значително се намалява изразходваната електрическа
енергия за осветление.
Ако има растителност в близост до
прозорците на дадена сградата, се осигурява
и естествено регулиране на слънчевата
енергия, преминаваща през прозорците.
През лятото дърветата със своята
листна маса предпазват проникването
на слънчевата светлина в сградата, а
през зимата слънчевите лъчи свободно
преминават през клоните на дърветата и

�проникват в сградата през прозрачните елементи.
Друг елемент са „слънчевите керемиди“. Те се поставят на покрива на сградите,
топлината се предава в помещенията чрез конвекция и топлопроводимост.
За 1 час Земята получава повече слънчева енергия, отколкото човечеството
употребявa за 1 година. Затова вече се говори за хелиоенергетиката.
Предимствата на слънчевата енергия:
• Екологична чистота
• Отсъствие на емисии от въглероден диоксид
• Неизчерпаемост
• Дълъг срок на експлоатация – слънчевите батерии могат да работят до 20-25
години.
Разработват се проекти за строителство на електростанции в безвъздушното
космическо пространство, където слънчевите лъчи не губят своята енергия.
Оттам енергията ще се изпраща до Земята.

�</text>
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    <itemType itemTypeId="1">
      <name>Текстови формати</name>
      <description>Текстови тесурси в текстови формати</description>
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                    <text>ТОПЛИННИТЕ ЯВЛЕНИЯ
И ТЕХНОЛОГИЧНОТО ИМ ПРИЛОЖЕНИЕ

Т

оплинните машини са устройства, които преобразуват топлинната енергия в
механична работа. Това става чрез пренос на топлина от по-топло към по-студено
тяло, като при този процес част от пренасяното количество топлина се преобразува в
работа. Топлинните двигатели могат да се различават значително по конструкцията си
и начина на работа. Топлинни двигатели са парната машина, двигателите с вътрешно
горене и др.
С изобретяването на парните двигатели през 18. век се поставя
началото на индустриалната революция. Тук огромен принос има
шотландският механик Джеймс Уат. В началото на 19. век парната
машина се използва за двигател на кораби. Малко по-късно в Англия
е пуснат първият локомотив, който отначало се движел по назъбени
релси, а през 1825 година е пуснат вече върху гладки релси. По
първата жп линия локомотивът се движел с 10 км в час!
Двигател с вътрешно горене (ДВГ) е вид топлинен двигател, при
който горивото се възпламенява и изгаря вътре в самия двигател. Получената от
разширяването на горещите газове енергия се преобразува в механична и се използва за
задвижване.
Първият ДВГ е конструиран от немския инженер Ото през 1876 година. Неговият
двигател използва като гориво бензин. Коефициентът на полезно действие на този
двигател е около 25%. Нарича се четиритактов, защото неговият цикъл
се осъществява в четири такта, което означава, че буталото извършва
четири движения в цилиндъра му.
Двадесет и пет години по-късно е конструиран нов, поусъвършенстван двигател от сънародника на Ото – Дизел, и е
наречен на негово име. Основното различие между двигателя на
Ото и дизеловия двигател е в начина, по който става запалването на
горивото. Дизеловите двигатели са по-прости, по-мощни и работят
по-ефективно от бензиновите.
Реактивният двигател отделя бързо движеща се струя от газ, за да
създаде тласък в противоположната посока, съобразно законите за движение на
Нютон. Като цяло повечето реактивни двигатели са двигатели с вътрешно горене. Този
вид реактивни двигатели се използват главно от реактивните самолети за пътуване на
дълги разстояния. Модерните реактивни самолети, които не развиват скорости, близки
до скоростта на звука, обикновено използват по-икономични и по-безшумни
реактивни двигатели.
И така, двигателите с вътрешно горене най-често
се използват за задвижване на превозни средства
(автомобили, мотоциклети, кораби, локомотиви,
самолети) и други подвижни машини. Те са удобни
за тази цел, тъй като могат да бъдат много мощни, а
горивото им – обикновено различни нефтопродукти,
са източници на много енергия.

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                    <text>ТОПЛИННО ЗАМЪРСЯВАНЕ
Не могат да съществуват топлинни машини, които преобразуват изцяло
топлинната енергия в полезна работа. Работата на всяка топлинна машина е
съпроводена с излъчване на определено количество топлина, която попада
в околната среда и предизвиква т.нар. топлинно замърсяване.
Например при топлоелектрическите
централи (ТЕЦ) или атомните
електроцентрали (АЕЦ) в парни котли се
създава силно нагрята пара, която завърта
турбината. След това парата трябва да се
охлади, за да се кондензира във вода и отново
да попадне в котела. Охлаждането става с
помощта на студени води, които се вземат от
река, езеро, океан. В резултат на топлообмена
с горещата пара тези води се нагряват от 5°С до 10°С и се връщат обратно в
околната среда. Така се затоплят водите на водния източник, изменя се химичният
и билогичният му състав, намалява се съдържанието на кислород, изгубва се
способността му да се пречиства. Живите организми умират, защото не са
приспособени да живеят при по-висока температура. Това води до помътняване
на водите, а мътните води поглъщат повече топлина от Слънцето, което води до
цикличен процес на увеличване на температурата.
Замяната на ТЕЦ с АЕЦ намалява химическото замърсяване, но увеличава
топлинното. Топлинното замърсяване е особено силно в промишлените райони
– то е съизмеримо с интензивното излъчване на Слънцето. Това означава, че тези
райони получават допълнително енергия от още едно слънце!
Големият проблем, свързан с топлинното замърсяване, е, че то не е локално
– не се увеличава температурата само на отделни райони, а на цялата планета.
Поради парниковия ефект топлинното замърсяване води до повишаване
температурата на цялата Земя.
Парниковият ефект е следствие на свойствата на атмосферата и се състои
в следното. Атмосферата пропуска слънчева светлина, благодарение на която
Земята получва енергия и се затопля. Едновременно с това атмосферата не
позволява на топлината, излъчена от Земята, да я напуска и да се разсее в
космическото пространство. Амосферата е „идеално одеяло“– пропуска топлина
навътре и спира напускането на топлина навън. За Земята входяща топлина е
слънчевата светлина, а изходяща – топлинното излъчване. Газовете в атмосферата,
които не позволяват топлината да се излъчи в Космоса, се наричат парникови.
Такива са водните пари и други газове. Ако тези газове не присъстваха в
атмосферата, температурата на повърхността на Земята щеше да е отрицателна, а
не 15°С, както е сега. Затова тези газове се наричат „парникови“, а ефектът –
„парников“, по подобие на известния ефект за запазване на топлината.

�Топлинните машини произвеждат огромно количество топлина, която се
изхвърля в околната среда, задържа се от парниковите газове и не може да се
излъчи в Космоса. Така Земята непрекъснато се нагрява.
Освен индустриалното производство, основано на топлинни двигатели, друга
причина за затоплянето е практически безконтролното изсичане на
тропическите гори през миналия век.
Съществуват почти противоположни мнения за действието на двигателите с
вътрешно горене (ДВГ).
Едното е, че автомобилите, които използват изключително ДВГ, почти не
влияят върху съдържанието на парникови газове в атмосферата.
Според другото мнение ДВГ са един от основните замърсители с парникови
газове. По време на горенето те изразходват огромни количества въздух. Знае се,
че за изгарянето на 1 литър гориво са необходими 10 куб. метра атмосферен
въздух, от който се използва само кислородът.
При своята работа ДВГ отделят и много други вредни за здравето на човека
вещества – прах, сажди и др. Причина за това е неефективният процес на
изгаряне на горивото, както и добавянето на различни вещества в горивото, за да
се увеличи мощността на двигателя.
Основният начин за решаване на екологичните проблеми, свързани с топлинните двигатели, е да се търсят нови технологии, водещи до повече икономичност
и до създаване на принципно нови двигатели. Алтернативно решение за ДВГ са
горивните клетки. В тях енергия се получава при изгарянето на водород и
кислород. Не се отделят вредни вещества. В тази насока е необходимо да се
намери евтин и екологичен начин за производството на водород.
Глобалният проблем на човечество е свързан с откриването на екологични
технологии за добиване на енергия.
Топлофикацията е процес на производство,
пренос, доставка, разпределение и потребление на
топлинна енергия с топлоносител вода или водна
пара, както и на гореща вода за битови и стопански
нужди.
Осъществява се чрез обекти и съоръжения за
производство, пренос, доставка и разпределение,
свързани в топлоснабдителна система.
Основни етапи в процеса на топлоснабдяването са: производство на топлинна
енергия; пренос на топлинна енергия; разпределение на топлинната енергия.
Началото на топлофикационната система в България е поставено в София
през 1949 година. Три години по-късно е започнало изграждането на
топлопреносна мрежа в София.

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