1、INTERNATIONAL STANDARD IS0 9459-l First edition 1993-l l-01 Solar heating - Domestic water heating systems - Part 1: Performance rating procedure using indoor test methods Chauffage solaire - Systkmes de chauffage de Ieau sanitaire - Pat-tie 7: Mkthodes dessai B Iintbrieur pour V usu- ally in the fo
2、rm of electrical resistance heat or thermal energy derived from combustion of fossil fuels. 3.10 collector, solar; solar thermal collector: De- vice designed to absorb radiant energy and to transfer the thermal energy so gained to a fluid passing through it. 3.11 collector, concentrating: Solar coll
3、ector that uses reflectors, lenses or other optical elements to redirect and concentrate the solar radiation passing through the aperture onto an absorber of which the surface area may be smaller than the aperture area. 3.12 collector, flat-plate: Non-concentrating solar collector in which the absor
4、bing surface is essentially planar. 3.13 collector loop: Continuous path followed by the primary heat transfer fluid in a solar energy sys- tem. 3.14 collector loop heater: Heater installed within the collector loop when testing the solar domestic water heating system with a non-irradiated array. 3.
5、15 collector tilt angle: Lower angle between the aperture plane of a solar collector and the horizontal plane. 3.16 control: Device for regulation of the solar thermal system or component in normal operation; can be manual or automatic. 3.17 direct irradiance: lrradiance produced by direct radiation
6、 on a given plane. 3.18 direct solar radiation: Radiation received from a small solid angle centred on the suns disc, on a given plane. NOTE 2 In general direct solar radiation is measured by instruments with field-of-view angles of up to 15”. Therefore a part of the scattered radiation around the s
7、uns disc (circumsolar radiation) is included. More than 99 % of the direct solar radiation on the earths surface is contained within the wavelength range from 0.3 pm to 3,0 pm. 3.19 domestic: For use in residential and small commercial buildings. 3.20 draw rate; water draw rate: Rate at which hot wa
8、ter is withdrawn from a system at a specified time. 3.21 equivalent length: Length of a straight section of pipe or duct causing the same pressure drop as that which actually occurs within the system at the same flowrate. 3.22 fluid transport: Transfer of air, water or other fluid between components of the system. 2
