Video narration
Socho fridge ek “cold-making” machine nahi hai. Ye bas heat ko andar se bahar pump karta hai, taaki food thanda rahe. Fridge ke andar jab aap darwaza kholte ho ya garam khana rakhte ho, andar ki air aur food ki heat badh jaati hai. Goal ye hai: is extra heat ko outside room me bhejna. Iske liye fridge me ek special fluid hota hai, jise refrigerant kehte hain. Ye fluid aasani se gas aur liquid me badal sakta hai. Isi switching se heat carry hoti hai. Cycle start hota hai evaporator se—yeh cooling coils hote hain jo fridge ke andar hote hain. Yahan refrigerant low pressure pe hota hai, isliye wo easily evaporate hota hai. Evaporate hote time wo andar ki heat absorb karta hai. Isiliye interior thanda lagta hai. Ab ye warm gas compressor me jaati hai. Compressor is gas ko “squeeze” karta hai—pressure badhta hai, aur temperature bhi badh jaata hai. Ab refrigerant bahut garam, high-pressure gas ban chuka hota hai. Ye gas phir condenser coils me jaati hai, jo fridge ke peeche ya sides me hoti hain. Yahan refrigerant room air ko heat deta hai, aur thanda hote hote wapas liquid ban jaata hai. Isiliye fridge ka back kabhi-kabhi garam feel hota hai. Next step: expansion valve ya capillary tube. Yahan liquid refrigerant ko suddenly narrow passage se guzara jaata hai, pressure drop hota hai, aur refrigerant jaldi se thanda ho jaata hai. Phir wahi thanda, low-pressure refrigerant evaporator me wapas aata hai, heat absorb karta hai, aur cycle repeat hota rehta hai. Bottom line: fridge “cold create” nahi karta. Wo heat ko inside se pick karke outside dump karta hai—aur is pumping ke liye electricity compressor ko power deti hai.