The company said its new York YVWH Water-to-Water Dual Variable Speed Screw Heat Pump is the first of its kind using the R-1234ze refrigerant in North America. “R-1234ze is a refrigerant with an ...

Researchers at the University of Padua in Italy have designed a dual-source ... pump, and a cylindrical tank acting as a receiver. The system can operate in three modes: air-mode (AIR-M); solar ...