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高温热水系统为供水温度超过350°F(176.67℃)的系统,而中温热水系统为供水温度超过250°F(121.11℃)并低于350°F(176.67℃)的系统。由于管道配件,设备和辅助设备受到压力限制,故实用温度通常均为450°F(232.22℃)以下。当高于450°F(232.22℃)时压力上升率大(见图1),因而需要更高额定压力的部件,这就会增加系统的造价。中温和高温热水系统的一般设计原则基本上是相同
The high temperature hot water system is a system where the supply temperature exceeds 350°F (176.67°C), while the medium temperature hot water system is a system where the supply temperature exceeds 250°F (121.11°C) and is lower than 350°F (176.67°C). Due to pipe fittings, equipment and auxiliary equipment being pressure limited, the practical temperatures are usually below 450°F (232.22°C). When the temperature rises above 450°F (232.22°C), the rate of pressure rise is high (see Fig. 1), and parts with higher pressure ratings are required, which increases the cost of the system. The general design principles for medium and high temperature hot water systems are basically the same