(2).Water heater at steady state boundarv mout outlet hot water water heater nlet min II 10L cold water mout=mn？ Close system or open system? 上游充通大 February 28,2019 8 SHANGHAI JIAO TONG UNIVERSITYFebruary 28, 2019 8 mout mout = min ? min Close system or open system? (2)．Water heater at steady state