Performance Evaluation of Three Types of Air-to-Water Cascade Heat Pumps for Cold Climate Applications Using Different Refrigerant Pairs. Int. j. math. phys. [Internet]. 2026 Jun. 8 [cited 2026 Jul. 23];17(1):109-21. Available from: https://ijmph.kaznu.kz/index.php/kaznu/article/view/1283