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ANSI/ASHRAE STANDARD , METHODS OF TESTING CHILLED BEAMS - PDF Free Download
ANSI/ASHRAE STANDARD , METHODS OF TESTING CHILLED BEAMS
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1 ANSI/ASHRAE STANDARD , METHODS OF TESTING CHILLED BEAMS NEMIC 2017
2 Agenda 1. Foreword 2. Purpose & Scope 3. Definitions 4. Instrumentation & Facilities 5. Test Methods 6. Reporting 7. Normative References Informative Annex A - Governing Equations For Chilled Beams Informative Annex B - Primary Airflow Measurement Informative Annex C - Electric Heated Person Simulators Informative Annex D - Radiant Shielded Temperature Sensor Normative Annex E - Laboratory Measurement Of Induced Airflow Rates And Calculation Of Induction Ratios 2 NEMIC 2017
3 1. FOREWORD 3 NEMIC 2017
4 ASHRAE Standard 200 was written at the request of the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) to provide test instrumentation and facilities, installation methods, and procedures for determining the capacity and related performance of chilled beams. Procedures provided in this standard apply to active chilled beams. 4 NEMIC 2017
5 Do NOT use this standard to determine the performance of an active chilled beam in the field. 5 NEMIC 2017
6 2. PURPOSE & SCOPE 6 NEMIC 2017
7 2. Purpose & Scope 1. PURPOSE 1.1 To define laboratory methods of testing chilled beams to determine performance. 7 NEMIC 2017
8 2. Purpose & Scope 2. SCOPE 2.1 Defines laboratory methods of testing chilled beams to determine performance. 2.2 Specifies test instrumentation, facilities, installation methods, and procedures for determining the performance of chilled beams. 8 NEMIC 2017
9 3. DEFINITIONS AND SYMBOLS 9 NEMIC 2017
10 3. Definitions and Symbols radiation shielded sensor: resistive temperature devices (RTDs) designed to measure dry-bulb air temperatures are susceptible to radiation heat transfer, and therefore the total temperature measured is the sum of the air temperature and the radiation component generated by a heat source or heat sink where present. Radiant shields must be attached to the RTD to minimize the effect of radiant heat transfer. The radiant shield must be designed such that the incoming radiation is deflected while not obstructing air currents. The maximum surface emissivity for the shield is The shield must be made of a thin conductive film or metal with high thermal conductivity greater than 150 W/m K. The inside of the shield must be designed to absorb incident radiation that may enter the shield through air vents, and interior emissivity must be greater than (See Informative Annex D for more information.) 10 NEMIC 2017
11 INFORMATIVE ANNEX D RADIANT SHIELDED TEMPERATURE SENSOR D1. PURPOSE The purpose of shielding a resistive temperature device (RTD) is to mitigate the effects of radiant heat transfer on the sensor and to measure only the drybulb air temperature. When a RTD is placed directly underneath a water coil, as typically found in an induction driven product, the radiant effects of the coil can have a significant impact on the measured air temperature. 11 NEMIC 2017
12 INFORMATIVE ANNEX D RADIANT SHIELDED TEMPERATURE SENSOR D2. DESIGN CONSIDERATIONS The shield should cover as much of the sensor as possible while still permitting sufficient air to pass over the sensor head. The shield should not be airtight to allow the air to circulate within. To minimize radiant heat transfer, several design considerations should be taken into account: 12 NEMIC 2017
13 INFORMATIVE ANNEX D RADIANT SHIELDED TEMPERATURE SENSOR Material Selection The material of the shield should be selected to have high thermal conductivity in order to minimize the effects of thermal storage and should not be thicker then 1 mm (0.04 in.). Materials such as aluminum, copper, and brass are ideal candidates, but care should be taken to prevent their oxidation. Construction The shield should completely encase the RTD. The shield should have ventilation slots notched out to allow for air to pass over the RTD. Figure D-1 gives an example of a cylindrical design with a single notched vent. Viewing Angle The viewing angle is the view to which the RTD sensor head will be directly exposed if placed in front of a radiant source as seen in Figure D-2. The view angle should be between 20 and 30 degrees.
14 INFORMATIVE ANNEX D RADIANT SHIELDED TEMPERATURE SENSOR 14 NEMIC 2017
15 4. INSTRUMENTATION AND FACILITIES 15 NEMIC 2017
16 4. Instrumentation and Facilities 4.2 Temperature and moist air properties measuring instruments shall meet the requirements of ASHRAE Standard 41.1 and ASHRAE Standard 41.6 and the following subsections Accuracy of the temperature measuring and moist air properties instruments shall be within the following limits: Air temperature ±0.2 F (0.1 C) Water temperature ±0.2 F (0.1 C) Temperature differential ±0.1 F (0.05 C) (sensors calibrated as a pair) Room dew-point temperature ±0.1 F (0.05 C) 16 NEMIC 2017
17 4. Instrumentation and Facilities 4.3 Pressure measuring instruments shall meet the requirements of ANSI/ASHRAE Standard and the requirements of Section For air pressure, the maximum scale intervals shall not be greater than the characteristics listed below for the accompanying range of pressure indicating device. Range Maximum Scale Interval to 0.10 in in. (1.0 to 25 Pa) (0.25 Pa) 0.10 to 1.00 in in. (25 to 250 Pa) (2.5 Pa) 1.00 to 2.00 in in. (250 to 500 Pa) (5.0 Pa) >2.00 in in. (>500 Pa) (25 Pa) 17 NEMIC 2017
18 4. Instrumentation and Facilities Barometric Pressure. The barometric pressure shall be obtained by means of a barometer located in the general test area and have accuracy within ±0.05 in. Hg (169 Pa). 4.4 Primary Airflow Measurement Airflow meters shall have an accuracy of ±5.0% of primary airflow reading Air temperature shall be maintained to within ±0.4 F (0.2 C) during airflow measurements Ductwork between the reference airflow measuring device and the device under test shall be sealed per SMACNA duct class A at 3 in. wc (747.3 Pa), seal class zero. 18 NEMIC 2017
19 4. Instrumentation and Facilities 4.6 Sound Power Measurement Sound Power Determination. Sound power levels shall be determined for the octave band center frequencies from 125 to 4000 Hz according to AHRI Standard Discharge Air Jet Performance Measurement. Used for throw measurements (see Section 5.7.5) Instruments used for discharge air jet velocity measurement shall meet the accuracy levels as shown in ASHRAE Standard 70, Method of Testing the Performance of Air Outlets and Air Inlets. 19 NEMIC 2017
20 4. Instrumentation and Facilities 4.8 Water-Side Cooling Capacity Measurement The water-side cooling capacity of the test object shall be determined from measurements of the cooling water flow rate and cooling water temperature rise under steady state condition. The water-side cooling capacity shall be presented as a function of the primary airflow rate and the temperature difference between the reference air temperature and the mean cooling water temperature The measurements shall be performed in an airtight room, according to the requirements of Section 4.8.3, with temperatures on the inside surfaces not varying by more than 3 F (1.7 C). 20 NEMIC 2017
21 4. Instrumentation and Facilities Internal Heat Supply Method The perimeter of the room shall be insulated and have negligible heat flow through it. The perimeters shall be insulated in such a way that during the test the average heat flow through these surfaces is less than 0.13 Btu/h/ft² (0.40 W/m²) To balance the cooling capacity of the test object, heating is supplied in the test room by means of a number of electric heated person simulators (i.e., dummies) as described in Informative Annex C. The dummies are placed on the floor inside the test room. To obtain reproducible results, the dummies shall be placed in determined positions as described in Section For location of beams relative to the dummies, see Section NEMIC 2017
22 4. Instrumentation and Facilities External Heat Supply Method To balance the cooling capacity of the test object, heating is supplied to the test room evenly distributed through the walls and the floor. The ceiling shall be insulated in such a way that during the test the heat flow through the ceiling is less than 0.13 Btu/h/ft² (0.4 W/m²). The temperature of the inner walls and floor of the test room shall be controlled and maintained uniform at any level necessary to sustain the desired room temperature. The maximum temperature difference between any point of the inner walls and floor during the test shall be less than 2 F (1.1K). 22 NEMIC 2017
23 4. Instrumentation and Facilities Test Room The floor area of the test room shall be between 108 and 600 ft² (10 and 55.7 m²) The ratio of width to length of the test room shall be not less than 0.5, and the inside height shall be between 9 and 10 ft. (2.7 and 3 m) The test room shall be sufficiently tight to minimize flow from the ambient air outside, which shall not exceed 0.16 cfm/ft² (0.8 l/s m²) of the perimeter surface at a pressure difference of 0.2 in. wc (50 Pa) (note includes floor, walls, and ceiling). 23 NEMIC 2017
24 5. TEST METHODS 24 NEMIC 2017
25 5. Test Methods 5.1 Acoustics 5.2 Physical Requirements for Water-Side Cooling Capacity 25 NEMIC 2017
26 5. Test Methods 5.3 Test Setup Requirements The following sections describe the location of (and qualification requirements for) the test sample, heat sources, and measurements required by the standard Heat-Source Qualifications and Location Internal Heat Supply Method Heat sources (i.e., dummies) must be used to provide internal heat supply (see Informative Annex C) Heat sources (i.e., dummies) should be placed in determined positions as specified in Section External Heat Supply Method Heat may be supplied by hot-water panels or electric heaters covering the surfaces of all four walls and the floor Heat must be supplied evenly through all four walls and the floor. Temperatures at any point on these five (5) surfaces must remain within 1.8 F (1 C) of each other throughout the test Other heat sources (e.g., dummies) should not be used for this method. 26 NEMIC 2017
27 5. Test Methods Test Sample Qualifications and Location One-way discharge installation 27 NEMIC 2017
28 5. Test Methods Two-way discharge installation 28 NEMIC 2017
29 5. Test Methods Four-way discharge installation 29 NEMIC 2017
30 5. Test Methods Three temperature sensors are installed lengthwise across the face of the test object, spaced evenly across the length and along the beam s center line as shown in the two-way test object 30 NEMIC 2017
31 5. Test Methods 5.7 Calculations and Expression of Results Calculations The parameters in the following subsections are determined directly by calculations using measured test data Water temperature rise, (Δt w ) = tw 2 tw Mean water temperature, (t w ) = 0.5 (tw 1 + tw 2 ) Induced air-to-mean-water-temperature differential, (Δt) = t r t w Induced air to primary air temperature differential, (Δt p ) = t r t p Cooling capacity of primary air, P a = m p c pa (t p t r ) Cooling capacity of water coil, P w = m w c pw (t w2 t w1 ). 31 NEMIC 2017
32 5. Test Methods Plot of Results Example best-fit curve for waterside cooling capacity vs. three primary airflow rates 32 NEMIC 2017
33 5. Test Methods Plot of Results Example best-fit curve for waterside cooling capacity vs. three temperature differentials 33 NEMIC 2017
34 5. Test Methods Plot of Results Example best-fit curve for waterside cooling capacity vs. three water flow rates 34 NEMIC 2017
35 6. REPORTING 35 NEMIC 2017
36 6. Reporting The test report shall include the following information: Name and address of the testing laboratory. Identification number of the test report. Name and address of the manufacturer or supplier of the test object. Name or identification codes of the test object. Detailed description of the test object, including relevant materials and dimensions (including coil cooling length, inside pipe diameter, number of pipe rows, and fin spacing). Description of the installation of the test objects in the test room (including clearance above beam to roof of test room). 36 NEMIC 2017
37 6. Reporting Description and identification of the test equipment and instruments used. Test results for each measuring point (as described in Section 5.7) and including primary air and water-side pressure drop. Test results for each test series, including the constants and diagrams (as described in Section 7.2). Nominal cooling/heating capacities (if applicable). Induction coefficient. Sketches of airflow pattern direction near the test object, drawn from smoke tests. Throw distance for 150, 100, and 50 fpm. Octaves 2 through 7 sound power data in decibles. 37 NEMIC 2017
38 7. NORMATIVE REFERENCES 38 NEMIC 2017
39 7. Normative References 1. ASHRAE ANSI/ASHRAE Standard (RA 2006), Standard Method for Temperature Measurement. Atlanta: ASHRAE. 2. ASHRAE ASHRAE Standard 41.3, Standard Method For Pressure Measurement. Atlanta: ASHRAE. 3. ASHRAE ASHRAE Standard (RA1992), Standard Methods For Laboratory Airflow Measurement. Atlanta: ASHRAE. 4. ASHRAE ANSI/ASHRAE Standard 70, Method of Testing the Performance of Air Outlets and Inlets. Atlanta: ASHRAE. 5. ASA ANSI/ASA S12.58, Sound Power Level Determination for Sources Using a Single-Source Position. Melville, NY: Acoustical Society of America. 6. ASHRAE ANSI/ASHRAE Standard 130, Methods of Testing Air Terminal Units. Atlanta: ASHRAE. 39 NEMIC 2017
40 7. Normative References 7. ASA ASA S12.51, Acoustics Determination of Sound Power Levels of Noise Sources Using Sound Pressure Precision Method for Reverberation Rooms. Melville, NY: Acoustical Society of America. 8. ASHRAE ASHRAE Terminology of Heating, Ventilation, Air Conditioning, and Refrigeration. Atlanta: ASHRAE. 9. EN 13182, Ventilation for buildings instrumentation requirements for air velocity measurements in ventilated spaces. 10. EN 14518, Ventilation for buildings Chilled beams Testing and rating of passive chilled beams. 11. EN 15116, Ventilation in buildings Chilled beams Testing and rating of active chilled beams. 12. SMACNA HVAC Duct Construction Standards Metal and Flexible, 3rd edition. Chantilly, VA: Sheet Metal and Air Conditioning Contractors National Association. 40 NEMIC 2017
41 INFORMATIVE ANNEX A GOVERNING EQUATIONS FOR CHILLED BEAMS 41 NEMIC 2017
42 Informative Annex A Typical chilled-beam functional diagram 42 NEMIC 2017
43 Informative Annex A Chilled-beam total cooling capacity: = Cooling capacity of primary air: + Coil cooling capacity (no condensation): P = Pa + Pw Pa = mp c pa (t p tr) Pw = mw c pw (tw2 tw1) Pw = K Af Δt Pw = mi c pa (ti1 ti2) 43 NEMIC 2017
44 INFORMATIVE ANNEX B PRIMARY AIRFLOW MEASUREMENT 44 NEMIC 2017
45 INFORMATIVE ANNEX C ELECTRIC HEATED PERSON SIMULATORS 45 NEMIC 2017
46 Informative Annex C Heat load simulator 46 NEMIC 2017
47 Informative Annex C 47 NEMIC 2017
48 Informative Annex C Plan view of test room and heat load simulator placement 48 NEMIC 2017
49 NORMATIVE ANNEX E LABORATORY MEASUREMENT OF INDUCED AIRFLOW RATES AND CALCULATION OF INDUCTION RATIOS 49 NEMIC 2017
50 NORMATIVE ANNEX E Active beam induced airflow rates shall be measured by either of two methods Measurement and calculation using a thermal balance, or Direct measurement using a zero-pressure method. The induction ratio (K in ) of the beam is the ratio of the induced-to-primary airflow rates of the beam. 50 NEMIC 2017
51 Thanks! Any questions? You can find me at: NEMIC 2017
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