ASTM WK37952

    New Specification for equipment and instrumentation of heat metering technologies

    (What is a Work Item?)

    Developed by Subcommittee: E44.25 | Committee E44 | Contact Staff Manager


    1. Scope

    1.1 This standard specifies the general performance requirements and operational characteristics for heat meter equipment and instrumentation to measure the heat that is either absorbed or given up by a heat conveying fluid across a heat exchange circuit. 1.2 The standard will apply to complete heat meter instruments comprised of two paired temperature sensors, a flow meter, and a calculator. Heat meter equipment and instrumentation complying with this standard will indicate the quantity of heat in legal units. 1.3 The standard is intended to define the requirements for heat meter instrumentation common to several renewable and conventional thermal energy technologies and end use applications including water heating, space heating and cooling, process heat and district heating applications. The standard should be agnostic to the thermal energy technology. 1.4 The standard will address metering applications involving single-phase, multi-phase, compressible and non-compressible heat conveying fluids including, but not limited to, water, glycol, saturated- and superheated steam. Once the technical committee has evaluated the commonalities, differences and challenges related to single-phase, multi-phase, compressible and non-compressible metering applications, the subgroup will determine whether separate standards or separate methods within a single standard are warranted. 1.5 The standard will not specify requirements or designs of other common system components such as controllers, thermostats, timers and shall be free of proprietary manufacturer designs, methods or features etc. 1.6 The standard will address concerns related to the placement and integration of heat meter subcomponents (flow meter, temperature sensors) into a thermal system environment in order to ensure that a complete instrument meeting this standard will perform as rated. 1.7 The standard will define security and onboard data integrity and storage requirements for devices meeting this standard. The standard will define such elements as supply voltage interruption requirements, onboard backup power (batteries) and security seal requirements etc. 1.8 The standard will specify a communications platform to support the cross integration of individual heat meter subcomponents and to meet the market requirements for onsite and remote access to meter data and information. The standard will define admissible data exchange and interfaces at the physical layer, link layer, and application layer for devices meeting this standard. 1.9 The standard will define a procedure (pattern/type approval test and initial verification test) to ascertain whether a device conforms to the metrological requirements and permissible errors defined under this standard. 1.10 The standard will define the manufacturer requirements for labeling devices including elements of manufacturer identification, environmental classification, admissible operating parameters and ranges and power supply requirements etc. 1.11 The standard will specify installation, commissioning, operational monitoring and maintenance requirements for devices meeting this standard. This includes, but is not limited to, the requirements and criteria for selection of a heat meter, quality specifications for heat conveying fluids, heat meter circuit design, and any additional elements unique to specific end use applications. 1.12 This standard does not purport to address all of the safety concerns, is any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    heat metering, renewable energy, heating and cooling, biomass, utilities

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    James Critchfield


    E44 (17-01)

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