1. ANSI/ASHRAE Standard 124-1991, Method of testing for rating combination space heating/water heating appliances. ASHRAE; 1991.
2. EN 12977-2. Thermal-solar systems and components: custom-built systems, test methods. Brussels: CEN; 2001.
3. prEN 13203. Qualification of hot-water functions of gas – fired appliances for domestic use. Brussels: European Committee for Standardization; 1998.
4. TRNSYS 15a transient simulation and program;Klein,2000
5. Heat transfer;Holman,1986