前言这是CSA P.11《燃气单元加热器效率和能耗测试方法》的第一版。1.范围1。本标准规定了最大输入功率为2931 kW（10000 Btu/h）或以下的燃气单元加热器（包括最大输入功率为117.2 kW[400 000 Btu/h]或以下的公用事业加热器）的热效率、耗电量和功率因数的测量要求，这些加热器由未使用的零件和材料制成，用于（a）入口压力为34.5 kPa（5.0 psi）或以下的天然气；（b） 人造气；（c） 混合气体；（d） 液化石油气； 和（e）液化石油气-空气混合物。1.2本标准涵盖了可从天然气转换为液化石油气的单元加热器，反之亦然。1.3在CSA标准中，“应”用于表示要求，即用户有义务满足的条款，以符合标准；“应该”用于表示建议或建议但不需要的建议；“可”用于表示一种选择或在标准范围内允许的选择；“can”用来表示可能性或能力。注释随附条款不包括要求或替代要求； 随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）以定义其应用。1.4以SI（公制）单位给出的数值为标准。括号中给出的值仅供参考。

PrefaceThis is the first edition of CSA P.11, Testing method for measuring efficiency and energy consumption of gas-fired unit heaters.1 Scope1.1This Standard specifies requirements for measuring the thermal efficiency, electric power consumption, and power factor of gas-fired unit heaters with a maximum input rate of 2 931 kW (10 000 000 Btu/h) or less (including utility heaters with a maximum input rate of 117.2 kW [400 000 Btu/h] or less) constructed of unused parts and materials, for use with(a) natural gas with an inlet pressure of 34.5 kPa (5.0 psi) or less;(b) manufactured gas;(c) mixed gas;(d) liquefied petroleum gases; and(e) liquefied petroleum gas-air mixtures.1.2This Standard covers unit heaters designed to be convertible from natural gas to liquefied petroleum gases and vice versa.1.3In CSA Standards, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; "may" is used to express an option or that which is permissible within the limits of the standard; and "can" is used to express possibility or capability. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.1.4The values given in SI (metric) units are the standard. The values given in parentheses are for information only.