英语翻译Heat meter installationA.1 IntroductionThis annex gives

英语翻译
Heat meter installation
A.1 Introduction
This annex gives recommendations for the installation of heat meters into the heating system of which they
form a component.
It includes reference to the quality of the heat conveying liquid and contains recommendations of direct
concern to the distributor of heat,the building owner and the final consumer.
A.2 Criteria for the selection of a heat meter
The type,size,accuracy and environmental class of a heat meter is determined according to the operating
and environmental conditions of the installation,taking into account particularly the following:
a) pressure of the heat conveying liquid;
b) physical and chemical characteristics of the heat conveying liquid;
c) acceptable pressure loss across the heat meter;
d) accuracy requirements;
e) temperature ranges in flow and return limbs to the heating system and the system temperature difference;
f) expected maximum and minimum flow rate of the heat conveying liquid;
g) required thermal power of the heating system;
h) nature of the flow rate through the heat meter,whether constant,variable or intermittent;
i) requirements concerning the electrical supply to the heat meter;
j) special requirements of the space around the heat meter for ease of reading,security installation and
servicing of the meter;
k) requirements for connections,i.e.flanges,fittings and meter dimensions.
A.3 Quality of the heat conveying liquid
A.3.1 General
Heat meters in general are constructed to withstand variations in the chemical constituents and the acidity or
alkalinity of the heat conveying liquid.However,the presence of solids in suspension and their deposition onto
the surfaces of the passages of the heat meter or their effect on the moving parts of a mechanical flow sensor
causes degradation of the performance with time.

热计量表的安装
A.1简介
本附录载列的建议热量表安装到他们其中供暖系统
形成一个组成部分.
它包括参照的热量输送液体的质量,包含了直接的建议
关注的热分销商,业主,最终消费者.
A.2节的标准选择一个热量表
的类型,大小,准确性和一个热量表环境等级确定根据经营
和环境条件的安装,尤其是考虑到以下情况：
液体的输送热量）压力;
二）输送液体热物理和化学特性;
三）跨热量表接受压力损失;
四）精度要求;
e）在四肢流动,并返回到加热系统和系统的温度温差范围;
六）预期的最高和最低的输送液体的热流量;
克）需要火电加热系统;
h）对流量的性质,通过热表,无论是常量,变量或间断;
一）要求有关电力供应的热量计;
j）条特殊要求周围的热表读数的空间,安全的安装和易用性
提供服务的计;
K）的要求进行连接,即法兰,管件和仪表尺寸.
A.3中的热量输送液体质量
A.3.1一般
一般热计的构造能够承受的化学成分及酸度或变
碱度的热量输送液体.但是,存在的悬浮固体及沉积到
对热能表段落或它们对机械流的运动部件的表面效应传感器
随着时间的原因分析性能下降.
求采纳=w=