Nkhani yokhudza magwiridwe antchito a makina ozizira
Makina oziziritsira ndi makina omwe amatenga kutentha kuchokera pamalo otentha pang'ono, kenako nkuwasamutsa kupita kumalo otentha kwambiri. Kuti izi zitheke, makinawo ayenera kugwira ntchitoyo chifukwa kutenthako kumachokera kutentha kwambiri kupita kutentha kochepa. Izi ndi zomwe Clausius ananena:
N'zosatheka kuti makina oziziritsira asamutse kutentha kuchokera pamalo otentha pang'ono kupita kumalo otentha kwambiri, popanda kugwira ntchito (Lamulo lachiwiri la thermodynamics—Clausius statement).
Makinawa amagwira ntchito (W) kusamutsa kutentha, kuchokera kutentha kochepa (Q L ) kupita kutentha kwakukulu (Q H ). Kutengera kusungidwa kwa mphamvu, Q L + W = Q H.
Ngati injini yotenthetsera imagwiritsa ntchito mawu akuti efficiency, ndiye kuti refrigerant imagwiritsa ntchito mawu akuti coefficient of performance (C P ). Coefficient of performance (C P ) ya refrigerant ndi chiŵerengero pakati pa kutentha komwe kumasamutsidwa kuchokera ku kutentha kochepa (Q L ) kupita ku ntchito (W), komwe kumachitika kuti kusamutse kutentha.
Chiŵerengero chabwino cha magwiridwe antchito a makina ozizira:
TL = kutentha kochepa, TH = kutentha kwambiri
