Ifomula Yamandla Enjini Yokushisa
Injini yokushisa iyithuluzi eliguqula amandla okushisa abe amandla omshini. Isimiso sokusebenza senjini yokushisa sisetshenziswa kabanzi empilweni yansuku zonke, kusukela ezinjinini zezimoto kuya ezitshalweni zamandla. Lesi sihloko sizoxoxa ngokujulile ngefomula yamandla enjini yokushisa, izinhlobo zezinjini zokushisa, indlela ezisebenza ngayo, izibonelo zokubala, kanye nokusetshenziswa kwazo.
Ukuqonda Amandla Enjini Yokushisa
Amandla enjini yokushisa yisilinganiso lapho amandla okushisa aguqulwa khona abe amandla omshini. Amandla alinganiswa ngama-watts (W), lapho i-watt eyi-1 ilingana ne-1 joule ngomzuzwana. Izinjini zokushisa zisebenza ngezimiso ze-thermodynamics, ikakhulukazi umjikelezo we-thermodynamic, ohilela ukushintshaniswa kokushisa nomsebenzi.
Ifomula eyisisekelo yamandla (\( P \)) enjini yokushisa yile:
\[ P = \frac{W}{t} \]
Kuphi:
– \( P \) amandla (ngama-watt),
– \( W \) umsebenzi (kuma-joules),
– \(t \) yisikhathi (ngemizuzwana).
Isimiso Sokusebenza Sezinjini Zokushisa
Izinjini zokushisa zisebenza ngokusekelwe kumjikelezo we-thermodynamic ohilela izinqubo eziningana eziyinhloko:
1. Ukumuncwa kokushisa (\( Q_H \)): Umshini umunca ukushisa okuvela emthonjeni wokushisa.
2. Ukuguqulwa kokushisa kube umsebenzi (\( W \)): Okunye kokushisa okumuncwayo kuguqulwa kube umsebenzi womshini.
3. Ukwenqatshwa kokushisa (\( Q_C \)): Ukushisa okusele kwenqatshwa echibini elibandayo.
Ukusebenza kahle (\( \eta \)) kwenjini yokushisa yisilinganiso somsebenzi okhiqizwayo ekushiseni okumuncwe:
\[ \eta = \frac{W}{Q_H} \]
Izinhlobo Zezinjini Zokushisa
1. Injini Yomusi: Isebenzisa umhwamuko wamanzi njengoketshezi olusebenzayo ukukhiqiza umsebenzi womshini. Izibonelo: Izitimela zomusi, ama-turbine omusi.
2. Injini Yokushisa Yangaphakathi: Isebenzisa uphethiloli ovutha ekamelweni elivaliwe ukuze ikhiqize umsebenzi. Izibonelo: Izinjini zezimoto, izinjini zedizili.
3. Injini Yokushisa Yangaphandle: Ukushiswa kukaphethiloli kwenzeka ngaphandle kwegumbi lokusebenza. Isibonelo: Injini Yokuxubha.
Ifomula Yamandla Enjini Yokushisa Efanele
Injini yeCarnot iyimodeli efanelekile yenjini yokushisa esebenza kahle kakhulu. Ukusebenza kahle kwenjini yeCarnot kuncike kuphela ekushiseni komthombo wokushisa (\( T_H \)) kanye nokushisa kwedamu elibandayo (\( T_C \)), okuchazwe kuKelvin:
\[ \eta_{\text{Carnot}} = 1 – \frac{T_C}{T_H} \]
Amandla enjini yeCarnot angabalwa kusetshenziswa ifomula:
\[ P = \eta_{\text{Carnot}} \times \frac{Q_H}{t} \]
Isibonelo Sokubalwa Kwamandla Enjini Yokushisa
Ake sithi injini yeCarnot isebenza phakathi komthombo wokushisa ku-500 K kanye nedamu elibandayo ku-300 K. Injini imunca ama-2000 J okushisa ngomzuzwana. Bala ukusebenza kahle kanye namandla enjini.
1. Bala ukusebenza kahle (\( \eta_{\text{Carnot}} \)):
\[ \eta_{\text{Carnot}} = 1 – \frac{T_C}{T_H} \]
\[ \eta_{\text{Carnot}} = 1 – \frac{300 \, \text{K}}{500 \, \text{K}} \]
\[ \eta_{\text{Carnot}} = 1 – 0.6 \]
\[ \eta_{\text{Carnot}} = 0.4 \]
2. Bala amandla (\( P \)):
\[ P = \eta_{\text{Carnot}} \times \frac{Q_H}{t} \]
\[ P = 0.4 \izikhathi \frac{2000 \, \text{J}}{1 \, \text{s}} \]
\[ P = 0.4 \izikhathi ezingu-2000 \]
\[ P = 800 \, \umbhalo{W} \]
Ngakho-ke, amandla enjini yeCarnot angama-watts angu-800.
Izicelo Zenjini Yokushisa
1. Ukukhiqizwa Kwamandla: Izinjini zokushisa zisetshenziswa ekukhiqizeni amandla ukuguqula amandla okushisa avela kumafutha angaphansi komhlaba noma amandla enuzi abe amandla kagesi. Ama-turbine omusi ayisibonelo esivamile senjini yokushisa ekukhiqizeni amandla.
2. Ezokuthutha: Izinjini zokushisa zangaphakathi, njengezinjini zikaphethiloli kanye nedizili, zisetshenziswa ezimotweni ukukhiqiza amandla aqhuba imoto.
3. Imboni: Izinjini zokushisa zisetshenziswa ezinqubweni ezahlukene zezimboni ukukhiqiza umsebenzi wemishini nokushisa. Izibonelo zifaka phakathi ukomisa, ukufudumeza, nokushayela imishini yezimboni.
4. Ukuqandisa Nokufudumeza: Izinjini zokushisa zisetshenziswa nasezinhlelweni zokuqandisa nokushisa, njengeziphephetha-moya kanye nezifudumezi zesikhala, ukudlulisa ukushisa kusuka endaweni eyodwa kuya kwenye.
Izici Ezithinta Amandla Enjini Yokushisa
1. Izinga Lokushisa Lomthombo Wokushisa Nedamu Elibandayo: Umehluko wokushisa phakathi komthombo wokushisa nedamu elibandayo uthinta ukusebenza kahle kwenjini yokushisa. Uma umehluko wokushisa umkhulu, kulapho ukusebenza kahle namandla enjini kukhuphuka khona.
2. Uhlobo Lukaphethiloli: Uhlobo kanye nekhwalithi kaphethiloli osetshenziswayo kuthinta inani lamandla okushisa akhiqizwayo, futhi ekugcineni, amandla enjini.
3. Umklamo Womshini: Umklamo nobuchwepheshe bomshini, okuhlanganisa izinto zokwakha kanye namasu okukhiqiza, kuthinta ukusebenza kahle kokuguqulwa kwamandla kanye namandla akhiqizwayo.
4. Izimo Zokusebenza: Izimo zokusebenza ezifana nokucindezela, isivinini, kanye nokugcinwa okuvamile kuthinta ukusebenza kanye namandla enjini yokushisa.
Ucwaningo Lwesibonelo: Isikhungo Sikagesi Esinomusi
Isitshalo samandla esinomusi siyisibonelo esicacile senjini yokushisa. Kulezi zitshalo, uphethiloli (njengamalahle noma igesi yemvelo) uyashiswa ukuze kufudunyezwe amanzi kubhoyila. Amanzi afudumele aguqulwa abe umusi ocindezela kakhulu, bese eqhuba i-turbine yesitofu. I-turbine yesitofu iguqula amandla okushisa esitofu abe amandla omshini, abese eguqulwa abe amandla kagesi yijeneretha.
Ake sithi isitshalo samandla esinomusi sinebhoyila efudumeza amanzi afike ku-600 K, bese umusi ophumayo uqhuba i-turbine enqaba ukushisa iye endaweni ebandayo emazingeni okushisa angu-300 K. Uma lesi sitshalo simunca ama-J angu-5000 ngomzuzwana, ukusebenza kahle kwenjini yeCarnot kanye namandla akhiqizwayo kungabalwa kanje:
1. Bala ukusebenza kahle (\( \eta_{\text{Carnot}} \)):
\[ \eta_{\text{Carnot}} = 1 – \frac{T_C}{T_H} \]
\[ \eta_{\text{Carnot}} = 1 – \frac{300 \, \text{K}}{600 \, \text{K}} \]
\[ \eta_{\text{Carnot}} = 1 – 0.5 \]
\[ \eta_{\text{Carnot}} = 0.5 \]
2. Bala amandla (\( P \)):
\[ P = \eta_{\text{Carnot}} \times \frac{Q_H}{t} \]
\[ P = 0.5 \izikhathi \frac{5000 \, \text{J}}{1 \, \text{s}} \]
\[ P = 0.5 \izikhathi ezingu-5000 \]
\[ P = 2500 \, \umbhalo{W} \]
Ngakho-ke, amandla ejeneretha yamandla kaphethiloli angama-watts angu-2500 noma ama-2.5 kW.
Isiphetho
Izinjini zokushisa zidlala indima ebalulekile ekuguquleni amandla okushisa abe amandla okusebenza angasetshenziswa ezinhlotsheni ezahlukene zokusebenza, kusukela ekukhiqizweni kwamandla kuya ekuthuthweni. Ifomula yamandla enjini yokushisa, i-P = Wt, isisiza ukubala izinga lokuguqulwa kwamandla. Ngokuqonda ukusebenza kahle kanye nezici ezithinta ukusebenza kwezinjini zokushisa, singaklama futhi sisebenzise izinhlelo ezisebenza kahle nezisimeme kakhudlwana. Ucwaningo lwesitshalo samandla esishisayo lunikeza umfanekiso oqondile wokuthi lezi zimiso zisetshenziswa kanjani embonini yamandla.
