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ASHRAE 64 11:2011 Edition

ASHRAE 64 11:2011 Edition

$21.13

ASHRAE Standard 64 2011 Methods of Laboratory Testing Remote Mechanical- Draft Evaporative Refrigerant Condensers

Published By Publication Date Number of Pages
ASHRAE 2011 18
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First published in 1974 and revised in 1989, 1995, and 2005, Standard 64 has been updated in this edition in several ways. SI units have now been made the primary units throughout

the standard, language such as “should” and “recommended” that is not enforceable has been removed or revised, references have been updated to the most recent editions, and

various editorial improvements have been made.This standard specifies procedures, apparatus, and instrumentation by which determinations of remote mechanical draft evaporative refrigerant condenser capacity can be obtained by laboratory testing with accuracy satisfactory to be used as the basis for commercial ratings.

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PDF Pages PDF Title
4 FOREWORD
1. PURPOSE
2. SCOPE
2.1 This standard specifies procedures, apparatus, and instrumentation by which determinations of remote mechanical- draft evaporative refrigerant condenser capacity can be obtained by laboratory testing with accuracy satisfactory to be used as the b…
2.2 This standard does not prescribe conditions for commercial ratings.
3. DEFINITIONS
4. REQUIREMENTS
4.1 Test Setup. The condenser under test shall be installed and tested in one of the closed-loop refrigeration systems outlined in Section 6.1. The test apparatus described in Section 6.1 and Figures 6.1, 6.2, and 6.3 are known workable systems, but …
4.2 Values To Be Determined. In order to evaluate the performance of a condenser, the following values need to be determined:
4.3 Duration of Test. After establishment of steady-state test conditions, all required readings, as detailed in Section 9.2, shall be recorded at a maximum of two-minute intervals. The test period shall be defined as a minimum of thirty (30) minutes…
4.4 Safety Requirements. All components in the test apparatus and the condenser shall meet the design requirements for safety as outlined in ANSI/ASHRAE Standard 15, Safety Standard for Refrigeration Systems.2
5. INSTRUMENTS
5.1 General
5 5.2 Temperature Measurements. Temperature measurements shall be made with instruments having accuracies within the specified limits for the following measurements:
5.3 Pressure Measurements. Accuracy of instruments for measuring refrigerant pressures at the condenser shall permit determination of the corresponding saturation temperature to within ±0.1°C (0.2°F).
5.4 Electrical Measurements and Instruments. Instruments used for measuring the electrical input shall have an accuracy within ±1.0% of the quantity measured. Electric power measurements shall be made at a location such that the instrumentation can …
5.5 Water Flow Measurements. Water flow rates shall be measured with instruments having accuracies within ±1.0% of the quantity measured.
5.6 Refrigerant Flow Measurement. Refrigerant flow rates shall be measured with instruments having accuracies within ±1.0% of the quantity being measured.
5.7 Speed-Measuring Instruments. Speed measurements shall be made with instruments having accuracies within ±1.0% if the absolute reading.
5.8 Time Measurements. Time measurements, if used in flow rate or power determinations, shall be made with instruments having accuracies within ±0.5% of the elapsed time measured. This accuracy shall include any uncertainty errors associated with st…
5.9 Weight Measurements. Weight measurements shall be made with instruments having accuracies within ±0.5% of the weight measured.
6 Figure 5-1 Typical calorimeter.
6. APPARATUS
6.1 Receiver Location and Sizing
6.2 Systems
7 Figure 6-1 High-side gravity recirculation system.
Figure 6-2 High-side pump recirculation system.
8 6.3 Heat Input: Electrical, Steam, or Hot Water. The lower heaters in the boiler/evaporators of Figures 6-1, 6-2, and 6-3 will evaporate the liquid as it is delivered from the test condenser. The total heat input (electrical, steam, or hot water) reg…
6.4 Refrigerant Charge. The systems in Figures 6-1, 6-2, and 6-3 are the fixed-charge type. The charge in these systems shall be such as to maintain a liquid level in the boiler/evaporator sufficient to fully cover all of the bottom heaters and at th…
6.5 Noncondensables. Prior to the beginning of the test, the system shall have been purged or evacuated to reduce noncondensable gases to an acceptable level. See Informative Appendix A for methods to check for noncondensable gases in the evaporative…
7. METHOD OF TESTING
7.1 Heat Rejection Measurements. Both primary and simultaneous confirming measurements of the refrigerant flow rate through the condenser shall be made. Enthalpies of the entering and leaving refrigerant shall be determined from the conditions of sta…
Figure 6-3 Compressor-driven recirculation system.
9 7.2 Air Temperature Measurements. The air temperatures entering and leaving the condenser shall be the arithmetical average of the individual recorded station readings.
8. TEST PROCEDURE
8.1 Average Refrigerant Mass Flow Rate. The primary and confirming refrigerant mass flow rates for each reading shall not differ by more than 3.0% in order to be valid. The average refrigerant mass flow rate for any individual reading shall not diffe…
8.2 Refrigerant Pressure Entering Condenser. The average saturated condensing temperature corresponding to the entering refrigerant pressure for any individual reading shall not differ from the average saturated condensing temperature for the test by…
8.3 Refrigerant Temperature Entering Condenser. The superheat of the refrigerant entering the condenser shall be regulated as illustrated in Figure 6-1 or Figure 6-2. The measured value shall not differ from the target value by more than ±2.8°C (5°F)
8.4 Condenser Entering-Air Wet-Bulb Temperature
8.5 Condenser Electrical Power Input. The electrical power, kilowatt, and voltage input to the condenser fan motor(s) and water pump motor(s) shall be measured and recorded.
8.6 Air and Spray Water Flow Rates. Measurements of the air and spray water flow rates are not required by this standard.
9. DATA TO BE RECORDED
9.1 Manufacturer’s Condenser Data
9.2 Test Data (Taken at Each Reading Interval)
10 10. CALCULATION OF RESULTS
10.1 Nomenclature
11 10.2 Calculations
12 11. TEST REPORT
11.1 General Information. The following general information shall be recorded:
11.2 Test Unit Description. The information recorded in Section 9.1 shall be reported.
11.3 Test System Description. The type of system used (i.e., Figure 6-1, 6-2, or 6-3) along with a description of the flowmeters used for the primary and confirming methods of refrigerant flow rate shall be recorded.
11.4 Test Unit Capacity. Based on the averages of the calculations for each reading, the following overall data shall be reported:
11.5 Calculation Summary. A summary sheet showing the results of all calculations for each reading shall be provided along with an example of the complete calculations for one set of readings.
11.6 Raw Data. The raw data recorded for each reading shall be included in the test report.
11.7 Instrument Summary. A tabulation listing all instruments and their corresponding manufacturers’ serial numbers and latest calibration dates shall be provided.
12. REFERENCES
13 INFORMATIVE APPENDIX A— METHODS FOR DETERMINING THE PRESENCE OF and for Removing NONCONDENSABLES IN REMOTE MECHANICAL-DRAFT EVAPORATIVE REFRIGERANT CONDENSERS
A1. Method 1
A2. Method 2
INFORMATIVE APPENDIX B— A METHOD OF MEASURING THE CONDENSER LEAVING AIR WET-BULB TEMPERATURE
14 INFORMATIVE APPENDIX C— ALTERNATE RECEIVER ARRANGEMENTS

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