基于f-chart设计方法，开发了一个图形程序，以确定HUD热水倡议计划中提议使用的太阳能家用热水系统是否具有足够的集热器面积，以提供该计划热性能要求规定的50%的负荷。该程序是专门为参与HUD计划的11个州（新英格兰州、大西洋中部各州和佛罗里达州）制定的；然而，它应该适用于其他气候相似的地方太阳能热水器集热器的尺寸。在该程序中，首先确定位于25个位置之一的参考太阳能热水系统的集热器面积。然后根据拟定系统和参考系统之间的一些可能差异确定面积调整系数。 所需的收集器面积计算为参考面积和面积调整系数的乘积。通过该程序计算的收集器面积与通过f-chart计算机程序计算的面积的最大差值小于10%。引文:加利福尼亚州洛杉矶ASHRAE Transactions第86卷第1部分

A graphical procedure was developed based on the f-chart design method to determine whether solar domestic water heating systems proposed for use in the HUD Hot Water Initiative Program have sufficient collector area to provide 50% of the load as prescribed by the thermal performance requirements of the Program. The procedure was specifically developed for the 11 states participating in the HUD initiative (the New-England and Mid-Atlantic States and Florida); however, it should be applicable for the sizing of the collectors for solar water heaters in other locations with similar climates. In the procedure, the collector area is first determined for a reference solar water heating system located in one of 25 locations. Area adjustment factors are then determined for a number of possible differences between the proposed system and the reference system. The required collector area is calculated as the product of the reference area and the area adjustment factors. The maximum difference in collector area calculated by the procedure and the area calculated by the f-chart computer program is less than 10%.