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本刊1978年第2期发表的《130℃/85℃开闭式高温热水采暖系统》一文(以下简称原文)经学习后觉得尚有一些问题,例如此类系统的工作原理有进一步搞清的必要。本文拟对此作些分析探讨。根据原文介绍方案(见图1)的工作状况,我认为闭式水箱的加压功能只存在于系统升温的过程中。如果系统工作水温达到上限设计温度后继续运行,过一段时间闭式水箱的加压作用就将逐渐消失。这是因为实际系统总会有泄漏,只是程度不同而已。由于系统失水,闭式水箱便不可能给系统加压。这样,系统的运行就可能出现以下两种状况:
The article “130°C/85°C Open and Closed High-temperature Hot Water Heating System” published in the 2nd issue of 1978 (hereinafter referred to as the original) has some problems after learning, for example, the working principle of such a system is further clarified. Necessary. This article intends to do some analysis of this. According to the working conditions of the original introduction scheme (see Figure 1), I believe that the pressurized function of the closed tank only exists in the process of system warming. If the system operating water temperature reaches the upper limit design temperature and continues to operate, the pressurization of the closed tank will gradually disappear over time. This is because there will always be leaks in the actual system, but only at different levels. Closed tanks cannot pressurize the system due to water loss in the system. In this way, the following two conditions may occur in the operation of the system: