In this paper, the evaporation of water droplets in two-phase steam compression processes and its influence on heat pump COP were analyzed. The results showed that the initial diameter of liquid particles greatly influences the cooling effect. This is because in the case of larger droplets, vapor condenses on the droplets to raise their temperature, and the droplets grow before evaporation. In these cases the quality of the two-phase steam decreases as compression advances, and so the cooling effect by evaporation does not work well. This growth of droplets is more remarkable for liquid particles of larger diameter and for higher speed of compression. Liquid particles of 10 um in diameter or less will increase the COP even in high-speed compression processes such as 50 rps (3000 rpm) in the compression cycle. ---Ushbu maqolada ikki fazali bug 'siqish jarayonlarida suv tomchilarining bug'lanishi va uning issiqlik nasosining COP ga ta'siri tahlil qilindi. Natijalar shuni ko'rsatdiki, suyuqlik zarralarining boshlang'ich diametri sovutish effektiga katta ta'sir qiladi. Buning sababi shundaki, kattaroq tomchilar bo'lsa, bug' tomchilarda ularning haroratini oshirish uchun kondensatsiyalanadi va tomchilar bug'lanishdan oldin o'sadi. Bunday hollarda ikki fazali bug'ning sifati siqilish kuchayishi bilan pasayadi va shuning uchun bug'lanish orqali sovutish effekti yaxshi ishlamaydi. Tomchilarning bu o'sishi kattaroq diametrli suyuqlik zarralari va yuqori siqilish tezligi uchun ko'proq e'tiborga loyiqdir. Diametri 10 um yoki undan kam bo'lgan suyuqlik zarralari COPni yuqori tezlikda siqish jarayonlarida ham oshiradi, masalan, siqish siklida 50 rps (3000 rpm) kabi.