BS EN 328:2014
$189.07
Heat exchangers. Forced convection unit air coolers for refrigeration. Test procedures for establishing the performance
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 50 |
This European Standard is applicable to non-ducted unit air coolers for refrigeration operating:
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with direct dry expansion of a refrigerant;
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with liquid overfeed by pump circulation of a refrigerant;
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with a liquid.
This standard specifies uniform methods of performance assessment to test and ascertain the following:
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product identification;
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standard capacity;
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standard liquid pressure drop;
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standard refrigerant pressure drop (for operation with liquid overfeed by pump circulation only);
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nominal air flow rate;
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nominal fan power.
It does not cover evaluation of conformity.
It is not applicable to air coolers for duct mounting or with natural air convection.
This standard does not cover technical safety aspects.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Contents Page |
| 6 | Foreword |
| 7 | Introduction |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 13 | 4 Symbols |
| 14 | Table 1 — Symbols |
| 15 | 5 Standard capacity 5.1 Basis of standard capacity data |
| 16 | 5.2 Standard conditions for the cooling capacity 5.2.1 General 5.2.2 Refrigerants Table 2 — Standard conditions for refrigerants |
| 17 | Table 3 — Standard conditions for operation with R744 (CO2) 5.2.3 Liquids Table 4 — Standard conditions for liquids 5.3 Conditions for the nominal air flow rate 5.4 Conditions for nominal fan power 6 Manufacturer’s data |
| 18 | 7 Measurements 7.1 Uncertainty of measurements |
| 19 | Table 5 — Uncertainty of measurements 7.2 Measurement criteria 7.2.1 Pipe side temperature measurement |
| 20 | 7.2.2 Superheating temperature 7.2.3 Temperature at expansion device inlet 7.2.4 Liquid temperatures 7.2.5 Water temperatures (balancing air heater) 7.2.6 Air temperature measurement 7.2.6.1 Air inlet temperatures |
| 21 | 7.2.6.2 Inside and ambient air temperatures 7.2.7 Pressure measuring points 7.2.8 Flow rates 7.2.8.1 General 7.2.8.2 Refrigerant flow rate 7.2.8.3 Liquid and water flow rate 7.2.9 Oil content 7.2.10 Non azeotropic refrigerant |
| 22 | 8 Testing methods and equipment 8.1 Testing methods 8.1.1 Capacity 8.1.1.1 General 8.1.1.2 Primary test method 8.1.1.3 Confirming test method 8.1.1.4 Air flow method 8.1.2 Air flow 8.1.3 Heat exchange with the ambient 8.2 Equipment 8.2.1 Calorimeter room 8.2.1.1 General |
| 23 | 8.2.1.2 Inside arrangement 8.2.1.3 Ambient arrangement |
| 24 | 8.2.1.4 Heat exchange with the ambient 8.2.1.5 Heat inducement 8.2.2 Refrigerant / liquid pipes 8.2.3 Expansion device 8.2.4 Flashgas 8.2.5 Air flow measurement 8.2.6 Liquid receiver |
| 25 | 9 Test procedures 9.1 General 9.2 Calibration of the calorimeter room |
| 26 | 9.3 Measurement of the cooling capacity 9.3.1 Air humidity 9.3.2 Subcooled refrigerant temperature 9.3.3 Steady-state conditions 9.3.4 Test duration |
| 27 | 9.3.5 Conducting the test 9.3.5.1 Refrigerants – direct expansion operation Table 6 — Deviation of test conditions 9.3.5.2 Refrigerants – operation with liquid overfeed by pump circulation 9.3.5.3 Liquids Table 7 — Deviation of test conditions |
| 28 | 9.3.6 Air inlet temperature 9.3.7 Data to be recorded 9.3.7.1 General 9.3.7.2 Refrigerants – direct expansion operation 9.3.7.3 Refrigerants – operation with liquid overfeed by pump circulation 9.3.7.4 Liquids 9.4 Measuring the fan performance |
| 29 | 10 Calculating the cooling capacity 10.1 Heat loss factor 10.2 Cooling capacity 10.2.1 From the air side energy input 10.2.1.1 General 10.2.1.2 Electrical power input 10.2.1.3 Water heated balancing air heater 10.2.2 From flow rate of refrigerant 10.2.3 From the flow rate of liquid |
| 30 | 10.2.4 Measured capacity 11 Conversion to standard conditions 11.1 Cooling capacity 11.1.1 General correction for atmospheric pressure 11.1.2 Refrigerants with direct expansion operation 11.1.2.1 Single test 11.1.2.2 Duplicate tests |
| 31 | 11.1.3 Refrigerants – operation with liquid overfeed by pump circulation 11.1.4 Liquids 11.1.4.1 Single test 11.1.4.2 Duplicate tests |
| 32 | 11.2 Calculating the standard liquid side pressure drop 11.2.1 General 11.2.2 Single Test 11.2.3 Duplicate Tests |
| 33 | 11.3 Nominal air flow 11.4 Nominal fan power 12 Test report |
| 34 | Annex A (informative) Bubble point temperature A.1 Diagram bubble point temperature Figure A.1 — Bubble point temperature |
| 35 | Annex B (normative) Test installation for direct expansion operation Figure B.1 — Test installation for direct expansion operation |
| 36 | Figure B.2 — Test installation for supercritical direct expansion operation |
| 37 | Annex C (normative) Test installation for liquids Figure C.1 — Test installation for liquids |
| 38 | Annex D (informative) Superheating and capacity Figure D.1 — Superheating and capacity |
| 39 | Annex E (normative) Test arrangement |
| 40 | Annex F (normative) Operation with liquid overfeed by pump circulation F.1 Scope F.2 Standard conditions Table F.1 — Standard conditions for operation with liquid overfeed by pump circulation Table F.2 — Standard condition for operation with CO2 with liquid pump circulation |
| 41 | F.3 Measurements F.3.1 Uncertainty of measurements F.3.2 Measurement criteria F.4 Testing methods and equipment F.4.1 Testing methods F.4.1.1 General F.4.1.2 Primary test method F.4.1.3 Confirming test method |
| 42 | F.4.2 Testing equipment F.4.2.1 The pipes connecting the unit cooler to the measuring installation, as well as the installation itself, particularly the liquid separator, shall be insulated thoroughly. The heat flow absorbed shall be below 0,5 % of the measured capacity. No … F.4.2.2 The flow metre in the low pressure circuit shall be placed between two sight glasses in order to check the presence of flash gas. F.4.2.3 Expansion device F.4.2.4 Liquid traps F.5 Test procedures F.5.1 Calibration of the refrigerant side of the installation F.5.2 Capacity measurements F.5.2.1 Steady-state conditions F.5.2.2 Permissible deviations |
| 43 | F.5.2.3 Conducting the test F.6 Capacity calculations F.6.1 Confirming method F.6.2 Recirculation rate for pump circulation |
| 44 | F.7 Conversion to standard conditions F.7.1 Cooling capacity F.7.2 Refrigerant side pressure drop F.7.2.1 Single test F.7.2.2 Duplicate tests |
| 45 | Figure F.1 — Circuit diagram for pump circulation |
| 46 | Figure F.2 — Definition of recirculation rate |
| 47 | Annex G (informative) Procedure to measure the oil content |
| 48 | Bibliography |
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