1、_SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2011 SAE International All rights reserved. No part of this publication ma
3、y be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside US
4、A) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2233_201102SURFACEVEHICLERECOMMENDEDPRACTICEJ2233 FEB2011 Issued 1995-12 Revised 2011-02 Super
5、seding J2233 JUN2002 (R) Bus Body Heating System Test RATIONALEThe current SAE J2233 test procedure provides two separate means of heating the coolant during testing, but these two approaches can provide very different results. If the engine is used to heat the coolant, the engine rpm and engine loa
6、d criteria are neither clear nor consistent. There are two distinct reasons to test a heating system: a. To compare two or more alternative heating systems during the design process. b. To compare the heater(s) performance of a specific vehicle and engine configuration to an established standard. Th
7、is revision recognizes these differences in the reasons for testing, and provides specific test conditions depending on the test intent. The changes in this revision are made bring this standard to be in compliance for recently updated SAE J381 and SAE J1612 test procedures and performance requireme
8、nts as well as Mid-Size Bus Heating System Performance Test procedure. Updated the test report template to match the procedure. 1. SCOPE This SAE Recommended Practice establishes uniform cold weather test procedures and performance requirements for engine coolant type heating systems of bus that are
9、 all vehicles designed to transport 10 or more passengers. The intent is to provide a test that will ensure acceptable comfort for bus occupants. It is limited to a test that can be conducted on uniform test equipment in commercially available laboratory facilities. Required test equipment, faciliti
10、es, and definitions are included.There are two options for producing hot coolant in this recommended practice. Testing using these two approaches on the same vehicle will not necessarily provide identical results. Many vehicle models are offered with optional engines, and each engine has varying coo
11、lant temperatures and flow rates. If the test is being conducted to compare the performance of one heater design to another heater design, then the external coolant source approach (Test A) will yield the most comparable results. If the test is being conducted to validate the heater installation on
12、a specific vehicle model with a specific engine, then using the engine to heat the coolant (Test B) will be more appropriate.Defrosting and defogging procedures and requirements are established by SAE J381 which is hereby included by reference.This document will be reviewed and revised as required w
13、ith advancements in technology and changes in environmental laws.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2233 Revised FEB2011 Page 2 of 131.1 Purpose This procedure is designed to provid
14、e bus manufacturers with a cost-effective, standardized test methods to provide relative approximations of cold weather interior temperatures. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicate
15、d, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J381 Windshield Defrosting Systems Test Procedure
16、and Performance Requirements - Trucks, Buses, and Multipurpose Vehicles SAE J638 Motor Vehicle Heater Test Procedure SAE J1612 Cab Heating Systems Test Procedure and Performance Requirements - Trucks, and Multipurpose Vehicles2.1.2 School Bus Manufacturers Technical Committee, Supplier Council, Nati
17、onal Association for Pupil Transportation PublicationAvailable from NAPT, 1840 Western Avenue, Albany, NY 12203, Tel: 518 452-3611, www.napt.org.School Bus Manufacturers Technical Committee No. 001 3. DEFINITIONS 3.1 HEAT EXCHANGER SYSTEM Means will exist for providing heating and windshield defrost
18、ing, and defogging, capability in a bus. The system shall consist of an integral assembly, or assemblies, having a core assembly or assemblies, blower(s), fan(s), and necessary duct systems and controls to provide heating, defrosting, and defogging functions. If the bus body structure makes up some
19、portion of the duct system, this structure or a simulation of this structure must be included as part of the system. 3.2 HEAT EXCHANGER CORE ASSEMBLY The core shall consist of a liquid-to-air heat transfer surface(s), liquid inlet, and discharge tubes or pipes. 3.3 HEAT EXCHANGER-DEFROSTER BLOWER An
20、 air-moving device(s) compatible with the energies available on the bus body. 3.4 COOLANT Liquid used for heat transfer composed of 50% ethylene glycol/50% water or other liquids specified by vehicle manufacturer for use in the heat transfer system. Copyright SAE International Provided by IHS under
21、license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2233 Revised FEB2011 Page 3 of 133.5 HEAT EXCHANGER-DEFROSTER DUCT SYSTEM Passages that conduct inlet and discharge air throughout the heat exchanger system. The discharge outlet louvers shall be
22、included as part of the system. 3.6 HEATER TEST VEHICLE The completed bus as designed by the manufacturer with, or without, a chassis, engine and drivetrain, including the defined heat exchanger system. If the vehicle is without a chassis, it shall be placed on the test site in such a way that the f
23、inished floor of the body is at a height, from the test site floor, equal to its installed height when on a chassis, and allholes and other openings normally filled when installed on a chassis will be plugged. 3.7 HEAT TRANSFER The transfer of heat from liquid to air is directly proportional to the
24、difference between the temperatures of the liquid and air entering the transfer system, for a given rate of liquid and air flow measured in kilograms (pounds) per minute, and that heat removed from liquid is equal to heat given to air. 3.8 HIGH IDLE A feature provided by the vehicle OEM to run the e
25、ngine above the normal idling speed, typically used to provide additional power during operation of power take-off equipment or for warming up the engine. 4. TEST EQUIPMENT 4.1 Test Site A suitable location (cold environmental chamber) sufficiently large to contain the basic bus or basic bus body wi
26、th provision for circulating air and capable of maintaining an average ambient temperature not to exceed 3.9 C (25 F) for the duration of the test period with or without vehicle engine on. The maximum air velocity across the vehicle shall be 8 km/h (5 mph). 4.2 Coolant Source 4.2.1 Test A 4.2.1.1 In
27、dependent Coolant Supply A closed loop system, independent of any engine/drivetrain system, capable of delivering coolant (as defined in 3.4) at 65.5 C 1.7 C (150 F 5 F) above the test site ambient temperature, and 22.7 kg (50 lb) per minute flow. The coolant supply device shall be equipped with an
28、outlet diverter valve to circulate coolant within the device during its warm-up period. The valve will then permit switching the coolant supply to the bus heat exchanger system at the start of the test. 4.2.2 Test B Engine running at 1500 rpm 50 rpm in neutral gear or the high idle RPM set by the ve
29、hicle OEM, whichever is higher. An auxiliary means for preheating the engine is permissible to provide easier engine starting. Engine speed shall be maintained with no load (normal engine parasitic loads only) throughout the test. That flow resulting from engine operation as prescribed in 4.2.1. 4.3
30、 Power Equipment Supply A source capable of providing the required test voltage and current for the heater system. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2233 Revised FEB2011 Page 4 of
31、134.4 Heat Exchange Units The heat exchangers used shall be tested, and rated, as required by the procedures established by either SAE J638, or the School Bus Manufacturers Technical Committee No. 001. The test rating of each unit, the method of determining its rating, and the quantity used, shall b
32、e recorded. 4.5 Thermometers, thermocouples, RTD, or other temperature measuring device with an accuracy of 0.5 C. 4.6 Stopwatch or other timing device. 4.7 Auxiliary power supply for blower motor. 4.8 Anemometer to measure air velocity (with a measuring accuracy of 2% of observed values). 4.9 Instr
33、ument for measuring voltage and amperage. It could be a voltmeter and a shunt type ammeter to read the voltage and current of the complete system. The ammeter and voltmeter shall be capable of an accuracy of 1% of the reading. 4.10 Flow meter or other device to measure coolant flow with accuracy of
34、2% of observed value. 4.11 VEC Temperature Average chamber temperature: 18 C 2 C (0 F 4 F). 4.12 VEC Air Velocity The maximum wind velocity shall not exceed 8 km/h (5 mph). 4.13 Heating and Defrosting System Controls Set heater and defroster controls to maximum temperature and maximum fan settings,
35、or the best combination to provide optimum heating performance. 5. INSTRUMENTATION 5.1 Air Temperature 5.1.1 Interior Recommended air temperature measuring instrumentation are thermocouples or RTDs. Thermometers are not recommended because of their slow response to rapid temperature changes.Measurin
36、g instrumentation shall be placed on alternate seat rows beginning 990 mm 130 mm (39 in 5 in) from the rear of the body, at 910 mm 50 mm (36 in 2 in) from the finished floor of the body. Also, the longitudinal centerline of the body should be instrumented. Four thermocouples shall be placed in the i
37、nterior of the vehicle: Test point 1 is located in the drivers area at a height of 760 mm 50 mm (30 in 2 in) inches above the center of the seat cushion at a distance of 150 mm 25 mm (6 in 1 in) in front of the headrest/seatback to approximate the drivers head location; Test point 2 is located a dis
38、tance of 1220 mm (4 ft) rearward of the front windshield;Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2233 Revised FEB2011 Page 5 of 13 Test point 3 is located at the midpoint of the body, an
39、d Test point 4 is located a distance of 1220 mm (4 ft) forward of the rear wall.Except for Test point 1, all thermocouples shall be located 1220 mm (4 ft) above the floor at the longitudinal centerline of the bus. Above indicated thermocouples for measuring vehicle interior temperatures will be used
40、 to determine heating system performance. Additional temperature measurements may be recorded at the discretion of the testing party to achieve further information related to the vehicle heating system. Recommended measurements include air temperature into the heater (fresh air and re-circulated air
41、 measured separately) and air temperature out of the main heater unit. 5.1.2 Vehicle Exterior Ambient Temperature The vehicle test chamber temperature should be measured by four exterior thermocouples. Two thermocouples are to be placed along the centerline of the vehicle, half way between the groun
42、d and the highest point of the vehicle (excluding bolt on items), 915 mm (3 ft) forward of the front of the vehicle and 915 mm (3 ft) away from the back of the vehicle. Left and right side vehicle ambient should be measured at a point 150 mm (6 in) away from left side and right side of the vehicle.
43、If a vehicle does not have mirrors, take measurement 450 mm (18 in) outward from left and right side window.Optional measuring devices shall be placed at each of the following locations:a. Mid-line of body forward of windshield b. Mid-line of body aft of the rear surface c. Mid-way between the axles
44、 on the right and left sides of the body 5.1.3 Driver Measuring devices shall be placed at appropriate locations to measure ankle, knee, and breath level temperatures with the drivers seat in rearmost, lowest, and body centermost position. a. Ankle Level - Place a minimum of four electrically averag
45、ed temperature measuring devices at the corners of a 25 x 250 mm (10 x 10 in) square area, the rearmost edge of which begins 200 mm (8 in) forward of the front edge of, and centered on, the seat cushion. The devices shall be located 75 mm 13 mm (3 in 0.5 in) above the floor surface. b. Knee Level -
46、Place a minimum of one measuring device at the height of the front top edge of the seat cushion and on the centerline of the seat. This measurement shall be 100 mm 25 mm (4 in 1 in) forward of the extreme front edge of the seat cushion and parallel to the floor. c. Breath Level - Place a minimum of
47、one measuring device 1070 mm 50 mm (42 in 2 in) above the floor and 250 mm 50 mm (10 in 2 in) forward of the seat back. The forward dimension shall be measured from the extreme upper edge of the seat back and parallel to the floor. d. Additional temperature measuring devices, if used, shall be docum
48、ented as to their type, quantity, and geometric location. The measurements obtained from these devices shall be included in the final report as additional results and not combined with the specific locations described in paragraphs a through b. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2233 Revised FEB2011 Page 6 of 135.1.4 (Optional) Heat Exchanger Inlet, Outlet, and Defrost Temperatures Additional temperature measure
