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ABSTRACT By analyzing the process of hot water circulating and the implication of additional flow,the weakness,lying in the definition of additional flow and in the calculation formula of circulating-pump head and circulationg-pump flow in current code,is pointed out. The implication of additional flow is also discussed.A new opinion about calculationg the pump head and the pump flow is brought brought forward.
KEYWORDS circulating flow, additional flow, circulating-pump flow,circulating-pump head

1 Requirements of the code
In curent Code for Design of Building Water Supply and Drainage(GBJ15-88),there are mainly two stipulations to the circulating-pump in a central heating flow,the circulating-pump head should as 15% of the maximum hourly hot-water consumption;Secondly,the circulating-pump head should be counted as Hb=(1+qf/qx)2.hp+hx[formula?],in which Hb is the circulationg-pump head is the circulation flow;qf is the additional flow,hp and hx are the head loss in distributing pipes and in is the circulationg flow;qf is the additional flow,hp and hx are the head loss in distributing pipes and in returning pipes respectively. In the code,the additional flow is definged as follows: In a mechanical circulating hot-water flow should be considered when calculating the head loss in the distributing pipes, so as to prevent the circulation from being destroyed by the partial water consumption. This water flow is called as an additional flow.
In recent years, many queries focusing on the implication and calculation the additional flow are put forward,but this seemed to have taken no effect on the code. In this paper, these queries are to be discussed.
According to the code, the formula for calculating the circulating flow is :qx=(3600Qs)/(C.?t),where Qs is the heat loss,which can be counted as 5%to 10%of the hourly heat consumption;C is the specific heat of water;?t is the temperature difference. It‘s obvious that the circulating flow is figured out on the assumption that there is no consumption occurring in the hot water system, the purpose of circulating is to maintain the temperature of the system.

Answer 1

摘要： 通过分析热水循环系统的过程和附加流的含义，指出了在附加流定义和循环泵水头以及流量计算公式在现行规范中的缺陷。也讨论了附加流的含义。提出了一个新的关于循环泵水头和流量的计算方法。

1 规范条件
供排水系统(GBJ15-88)设计现行规范中，关于循环泵中间暖水流量主要有两个限制，循环泵水头消耗15%最大每小时热水量；第二 循环泵水头可通过公式
Hb=(1+qf/qx)2.hp+hx计算，Hb是循环流量；fg是附加流，hp和hx是水头分管和回流时的损失。规范中附加流定义是：在机械循环中，当计算水头分管损失时，为了防止热水流循环被破坏，需要消耗部分水，这部分水这是附加流。

近年来，提出了许多关于附加流定义和计算的问题，然而规范对这些问题起不到作用。在本文中将会讨论这些问题。

根据规范，计算循环流量的公式是：qx=(3600Qs)/(C.?t)，其中Qs是热损失，可以以每小时热损耗的5%到10%计算；C是水的比热；?t是温差。很明显，计算循环流量是在假定热水系统不存在消耗的前提下的，循环的目的是维持温度系统。

注：中间有段英文重复了，个别句子读不通，像
In a mechanical circulating hot-water flow should be considered when calculating the head loss in the distributing pipes这句，是不是漏了标点符号？
翻译供参考

Answer 2

摘要通过分析的过程中热水循环和含义额外的流量，软弱，倒卧在定义额外的流动和在的计算公式，循环泵的头部及circulationg -水泵流量在目前的代码，是指出。言下之意，额外的流量也讨论了新的看法， calculationg泵头部和水泵流量是所带来的结转。
关键词循环流动，增加流量，循环水泵流量，循环泵头部

一守则规定
在curent设计规范建设，供水和排水（ gbj15 - 88 ） ，主要有两个规定，以循环泵在一个中央暖气流，循环泵头部应的15 ％ ，最高每小时热水消费;第二，循环泵头部应算作乙肝= （ 1 +资历架构/ qx ） 2.hp +的HX [公式？ ] ，在这种血红蛋白是circulationg泵头部是循环流量;资历架构是额外的流量，惠普和HX是水头损失在分发管道和在是circulationg流;资历架构是额外的流量，惠普和HX是水头损失在分发管道和在返回的喉管。在代码中，额外的流量是definged如下：在机械循环热水流量时，应考虑计算水头损失，在分发管道，以防止流通从被摧毁，由部分水的消费。这水流是所谓的作为额外的流量。
近年来，许多疑问，着眼于内涵和计算的额外流量，提出了，但是这似乎没有采取任何影响，该守则。在这方面的文件，这些疑问都加以讨论。
根据守则，计算公式循环流量是： qx = （ 3600qs ） / （长？吨） ，其中质量得分是热损失，这可以算为5 ％至10 ％的每小时热量消耗; C是具体的热食水; ？ T是温差。很明显，循环流量是揣摩上的假设是有没有消费发生在热水系统，循环的目的，是要保持温度的系统。