ISO 916:2020 pdf download.Testing of refrigerating systems
This document applies to the performance testing of compressor driven refrigerating systems (hereafter referred to as refrigerating systems) that operate according to the principle of vapour compression and consist of the circuit parts for compression, condensation, and evaporation as well as the connecting pipes and any necessary associated ancillaries required for a complete refrigeration circuit.
This document does not apply to the testing of other refrigeration systems such as absorption or steam jet refrigerating systems.
Testing of the suitability of a refrigerating system for a specific use, such as household refrigerators,refrigerated commercial and display cabinets, air conditioners, is not covered by this document.
This document includes testing outside laboratories or where specific laboratory testing standards for systems do not exist and which is performed according to agreed operating conditions.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5167 (all parts), Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 overall refrigerating capacity
Q og rate at which heat is extracted from the ambient by the refrigerant
Note 1 to entry: As a rule, for single-stage refrigerating systems, the overall refrigerating capacity corresponds to the product of the mass flow and the difference between the respective enthalpies of the refrigerant at the inlet of the compressor and at the outlet of the condenser or aftercooler, if provided (see also 8.1.1).
3.2 net refrigerating capacity
Q on rate at which heat is extracted from the cooled medium in the evaporator by the refrigerant
Note 1 to entry: See also 8.1.2.
5 Performance warranty
5.1 General
5.1.1 Only the characteristics essential to the economic efficiency and the operation of refrigerating systems and verifiable by usual measurement methods shall be the subject of performance warranty. This requires allowances for the variations of operating conditions which are hardly avoidable in practice.
5.1.2 For the data according to 5.2.1 to 5.2.7, it is recommended to indicate several values near the operating conditions according to 5.3, particularly for the temperature values. To avoid interpolation,these values may be presented graphically within the variation limits for each pair of values. Permissible deviations shall be subject to agreement.
5.1.3 The influence of temporary variations on other operating conditions shall be subject to agreement.
5.2 Subject of technical warranties
5.2.1 General
Subject of the technical warranties are the refrigerating capacity and the power absorbed at operating conditions which need to be agreed.
5.2.2 Refrigerating capacity
The refrigerating capacity shall be agreed as:
— overall refrigerating capacity (see 3.1);
— net refrigerating capacity (see 3.2); or
— useful refrigerating capacity (see 3.3).
5.2.3 Compressor absorbed power
The following shall be subject to agreement:
a) the power absorbed at the compressor shaft;
b) the power output at the driver shaft;
c) the power absorbed by the motor, e.g. electrical power input at the motor terminals; or
d) the fuel consumption of the engine.ISO 916 pdf download.ISO 916 pdf download
