ASHRAE Standard 216 provides standardized performance data for the application of overhead circulation fans in indoor spaces. The room air speed distribution test results can be used to calculate occupant thermal comfort and to demonstrate compliance with the thermal comfort requirements of ASHRAE Standard 55.This standard includes requirements for test instrumentation, test room features, and measurement procedures. It also includes calculation procedures for a number of performance metrics relevant to thermal comfort application of overhead circulator fans, such as uniformity, room average cooling effect, heating draft risk, and comfort cooling efficacy.<\/p>\n
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| 1<\/td>\n | ANSI\/ASHRAE Standard 216-2020 <\/td>\n<\/tr>\n | ||||||
| 3<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | FOREWORD 1. PURPOSE 2. SCOPE 2.1 This standard applies to overhead circulator ceiling fans. 3. DEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | 4. SYMBOLS AND UNITS 4.1 For the purposes of this standard, the symbols and primary units given in Table 4-1 for the parameters listed apply. <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | 5. INSTRUMENTS AND APPARATUS 5.1 Measurement Criteria. The measuring instrumentation used shall meet the minimum requirements for measurement range and accuracy given in Table 5-1. Air dry-bulb temperature sensors shall be shielded from radiation exchange with the surroundings. 5.2 All equipment used to measure parameters listed in Table 5-1 shall be calibrated over the range of values to be encountered during testing against a meter with a calibration by an ISO 17025 2 accredited calibration laboratory that is traceable to… 6. TEST CONDITIONS AND GENERAL PROCEDURES 6.1 Test Conditions <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 6.2 General Test Procedure 7. AIR SPEED MEASUREMENTS AND MEASUREMENT LOCATIONS 7.1 Test Chamber and Fan Mounting Height Requirements 7.2 Air Speed Testing <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 7.3 Measurement Frequency and Duration 8. CALCULATIONS 8.1 Air Density. The air density (ra) shall be determined from measurements, taken in the test chamber at the start of each test session, of ambient dry-bulb temperature (tdb), ambient wet- bulb temperature (twb), and ambient barometric pressure (Ba)… <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 8.2 Fan Operational Parameters. The mean of the measured values for input current, input power, voltage, and fan speed, collected per Section 6.2.1, shall be calculated using equation 8.4: 8.3 Weighting Factors. Calculate the weighting factor (WF) corresponding to each sensor test position defined in Section 7.2. As both TP0 and TPmax have only one adjacent test position, these weighting factors are calculated using unique equations. W… 8.4 Average Air Speed. The average air speed shall be calculated for each test point and test position specified in Section 7.2. The levels of the test points are 4, 24, and 43 in. (0.1, 0.6, and 1.1 m) for determining the seated average air speed fo… <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 8.5 Maximum Average Air Speed. The maximum value for the seated average air speed (Va,m,seated,max) and the standing average air speed (Va,m,standing,max) shall be determined from average air speeds determined per Section 8.4. 8.6 Minimum Average Air Speed. The minimum value for the seated average air speed (Va,m,seated,min) and the standing average air speed (Va,m,standing,min) shall be determined from average air speeds determined per Section 8.4. 8.7 Uniformity. The uniformity shall be calculated from the seated average air speed and the standing average air speed determined per Section 8.4. The test positions with the largest and smallest average air speeds shall be eliminated, and the secon… 8.8 Room Average Air Speed. The mean of the air speeds measured at each test position specified in Section 8.3, room average air speed shall be calculated for both seated and standing occupants. <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 8.9 Room Average Cooling Effect. The average air speed at each test position shall be used with the assumed space conditions in Table 8-2 to determine a room average cooling effect. The cooling effect at each test position is determined based on the … 8.10 2.5r Cooling Effect. The 2.5r cooling effect shall be determined using the same methodology and assumptions used to calculate room average cooling effect in Section 8.8, except the air speed at a distance from the center of the fan equal to 2.5 … <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 8.11 Cooling Coverage Fraction. The fraction of the area where the average air speed is greater than or equal to 85 fpm (0.43 m\/s), which results in a cooling effect of approximately 4\u00b0F (2.2\u00b0C) at the comfort conditions defined in Section 8.9. 8.12 Heating Draft Risk Fraction. The fraction of the area where the average air speed is greater than 40 fpm (0.2 m\/s). This metric is only applicable for fans operating in spaces where conditions would meet the criteria for unwanted local cooling o… <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 8.13 Cooling Fan Efficiency (CFE). Ratio of the cooling effect to the input power of the fan. CFE shall only be calculated for test conditions where the cooling coverage fraction is greater than or equal to 90%. For any test condition where the cooli… 9. REPORT AND RESULTS OF TEST 9.1 Report. The report of a laboratory overhead circulator ceiling fan test shall at a minimum include the following data. <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 10. NORMATIVE REFERENCES <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | INFORMATIVE APPENDIX A: USE OF FAN TEST DATA FOR CALCULATION OF EQUIVALENT STANDARD EFFECTIVE TEMPERATURE <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | INFORMATIVE APPENDIX B: INFORMATIVE REFERENCES AND BIBLIOGRAPHY <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | INFORMATIVE APPENDIX C: EXAMPLE TEST REPORT <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" ASHRAE Standard 216-2020 – Methods of Test for Determining Application Data of Overhead Circulator Fans (ANSI Approved)<\/b><\/p>\n |