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BS ISO 21773:2021

BS ISO 21773:2021

$198.66

Methods of test and characterization of performance for energy recovery components

Published By Publication Date Number of Pages
BSI 2021 52
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This document specifies methods for testing and characterizing the performance of air-to-air heat/energy exchangers when used as devices to transfer heat or heat and water vapor between two airstreams used in ventilation systems. It also specifies methods to characterize the performance of exchangers for use in calculation of the energy performance of buildings. This document is applicable to:

  • fixed-plate exchangers (also known as recuperators),

  • rotary exchangers, including heat wheels and total energy wheels (also known as regenerators),

  • heat pipe exchangers using a heat transfer medium, excluding those using mechanical pumping.

This document does not provide a method for measuring the response of exchangers to the formation of frost.

PDF Catalog

PDF Pages PDF Title
2 National foreword
7 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
12 4 Symbols and abbreviated terms
13 5 Metrics
5.1 General
14 5.2 Effectiveness
5.3 Pressure drop
5.3.1 Measured pressure drop
5.3.2 Standardized pressure drop
15 5.4 Recovery efficiency ratio
5.5 Outside air correction factor
16 5.6 Exhaust air transfer ratio
5.7 Sensible energy transfer rate for the supply airstream
5.8 Humidity transfer rate for the supply airstream
5.9 Total energy transfer rate for the supply airstream
6 General test requirements
6.1 Test apparatus
17 6.2 Installation
6.3 Static pressures
6.4 Instrument calibration
18 7 Effectiveness tests
7.1 Test requirements
7.2 Stability limits when testing effectiveness
19 7.3 Data collection period
7.4 Data sampling rates
7.5 Temperature and humidity conditions: inlets to exchanger
20 7.6 Test temperature limits
8 Pressure drop tests
9 Leakage tests
9.1 General test requirements
21 9.2 Outside air correction factor
9.3 Exhaust air transfer ratio
10 Uncertainty limits
10.1 General
10.2 Uncertainty limits for effectiveness tests
10.3 Uncertainty limits for RER
22 10.4 Uncertainty limits for measured pressure drop tests
10.5 Uncertainty limits for leakage tests
11 Inequality limits
11.1 General
11.2 Inequality limits for thermal tests
23 11.3 Inequality limits for leakage tests
12 Reporting of test results
12.1 Pressure drop test results
12.2 Leakage test results
12.3 Thermal test results
24 12.4 Uncertainties
25 Annex A (informative) Example of test data collection and calculation of metrics
29 Annex B (informative) Best practices
40 Annex C (informative) Expression of performance metrics for use in calculation of system performance
44 Annex D (informative) Inequality limits for use when condensate flow rate can be measured
45 Annex E (informative) Expressions, used in other standards, related to effectiveness as defined in this document
51 Bibliography

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BS ISO 21773:2021
$198.66