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Heat Pumps Technology Guide SEAI 8. Metering Key messages • Heat meters usually consist of a flow sensor, a pair of temperature sensors and a calculator or integrator to determine actual heat flow. Important elements are: • The working fluid, • The flow and temperature ranges, • The pipe diameter, • Whether the meter is battery or mains powered, • Whether the meter is to be installed in the flow or return pipe, and • The ambient temperature. • Key considerations when selecting and installing heat meters are: • The class of meter (which defines its accuracy), • The manufacturers’ installation requirements and frequency of maintenance/calibration, • A pair of temperature sensors matched to an accuracy of 0.01 °C, • Matched flow meter, and • Matched data integrator. • For heat pumps, it is good practice to measure the electricity consumption of the heat pump and the other equipment in the installation, in order to be able to measure the system performance. 8.1. Heat metering 8.1.1. Principles and types of meter It is good practice to measure heat output and heat use. Most heat pump installations need heat metering. Reasons for measuring heat include: • To measure heat pump efficiency; • To determine the heat use of particular loads; • To provide diagnostic information in the event of a system fault; • To provide control signals for firing top-up and standby heat pumps; • To bill heat users, particularly for systems where there are multiple users; and • To meet the requirements of incentive schemes. There are various manufacturers providing heat meter systems. Selecting an appropriate heat meter depends on: • The working fluid, • The operating ranges for flow rate and temperature, • Pipe diameter, • Whether the meter is battery or mains powered, • Whether the meter is installed in the flow or return pipe, and • The ambient temperature. A heat meter normally comprises a flow sensor (flow meter), a matched pair of temperature sensors and an integrator (or calculator) with display. 31PDF Image | Heat Pumps Technology Guide
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