BS ISO 916:2020 pdf free.Testing of refrigerating systems.
BS ISO 916 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.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 offluid flow by means of pressure differential devices inserted in circular cross-section conduits running full.Only measuring instruments with fully verifiable indications shall be used. It is essential that the measurement uncertainty can be determined by calibration and does not vary during testing. Measuring instruments whose condition may vary during the test shall be verified both before and after testing. The measurement uncertainty values indicated below refer to the extended measurement uncertainty with a confidence interval of 95 % corresponding to twice the standard deviation.Besides the types of measuring instruments indicated below, other generally accepted measuring instruments or devices may be used provided they comply with the indicated measurement uncertainties.The refrigerant mass flow can be determined by using the heat balance at each component of the circuit through which it passes. Any case of previously branching off partial flows shall be taken into account.BS ISO 916 pdf download.