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 there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this p
3、ublication may 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: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/J2918_201202SURFACEVEHICLERECOMMENDEDPRACTICEJ2918 FEB2012 Issued 2012-02 Engine-Of
5、f Cab Heating and Air Conditioning Systems Test Procedure and Performance Requirements - Trucks with and Without Sleepers RATIONALE This Recommended Practice has been developed for the purpose to provide uniform performance requirements, minimum temperature specifications, and defines the criteria u
6、sed to determine engine-off heating, ventilation, and air conditioning (HVAC) systems for truck with and without sleepers in order to achieve driver and passenger(s) thermal comfort in both winter and summer rest periods. It is limited to a test that can be conducted on uniform test equipment in com
7、mercially available laboratory facilities. This Recommended Practice is designed to help equipment users select an engine-off HVAC system that best suits their operations particular need through a standardized test. 1. SCOPE This SAE Recommended Practice establishes uniform test procedures and perfo
8、rmance requirements for engine-off heating, ventilation, and air conditioning (HVAC) systems in order to achieve driver thermal comfort in both winter and summer rest periods. This specification will apply to heavy trucks with and without sleeper compartments, including but is not limited to Class 6
9、, 7, and 8 powered vehicles. 1.1 Purpose The purpose is to provide a standard test procedure for comparison and evaluation of truck heating and air-conditioning performance with truck engine off. 2. REFERENCES 2.1 Related Publications The following publications are provided for information purposes
10、only and are not a required part of this SAE Technical Report.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 J1163 Determining Seat Index Point SAE J1
11、559 Determination of Effect of Solar Heating SAE J2918 Issued FEB2012 Page 2 of 8 2.1.2 ATA Publications Available from Technology 40% 3% (day cab truck without sleeper) 6.2.3 Engine Speed: 0 (engine off) 6.2.4 Wind Speed: (Air Velocity) Maximum wind velocity shall not exceed 8 km/h (5 mph). 6.2.5 I
12、nitial cab/sleeper temperature of 22.8 C 2.8 C (73 F 5 F) (at each TCs location per Figure 1, Figure 2, Table 1) with average 20.0 C (68 F). 6.2.6 In the vehicle with sleeper factory installed curtains closed. 6.2.7 Turn solar load on and adjust to 600 W/m2 50 W/m2. Measure solar load at the roofs s
13、urface on the center of the truck cab. 6.2.8 Begin Data Acquisition Check that all channels are reading properly. Set scan rate for 1 min intervals. 6.3 The minimum requirement for an engine-off air conditioning system: 6.3.1 Truck with Sleeper Compartment Maintain a maximum sleeper temperature 25.6
14、 C (78 F) at each defined location (Figure 2, Table 1) for 10 h with average sleeper temperature (see 3.4) to be 22.8 C 2.8 C (73 F 5 F).6.3.2 Day Cab Truck Maintain a maximum day cab temperature 25.6 C (78 F) at each defined location (Figure 1) for 2.5 h with average temperature (see 3.3) to be 22.
15、8 C 2.8 C (73 F 5 F). At the end of the test, the temperature at each occupant head shall not exceed the temperature at the feet. 6.4 Heating Test Procedure 6.4.1 VEC Ambient 0.0 C 2.0 C (-17.8 F 4 F) 6.4.2 Relative Humidity: N/A 6.4.3 Engine Speed: 0 (engine off) SAE J2918 Issued FEB2012 Page 6 of
16、8 6.4.4 Wind Speed: (Air Velocity) Maximum wind velocity shall not exceed 8 km/h (5 mph). 6.4.5 Initial cab/sleeper temperature of 22.8 C 2.8 C (73 F 5 F) (at each TCs location per Figure 1, Figure 2, Table 1) with average 25.6 C (78 F). 6.4.6 In the vehicle with sleeper factory installed curtains c
17、losed. 6.4.7 No solar load. 6.4.8 Begin Data Acquisition Check that all channels are reading properly. Set scan rate for 1 min intervals. 6.5 The minimum requirement for engine-off a heating system: 6.5.1 Truck With Sleeper Compartment Maintain a minimum sleeper temperature 20 C (68 F) at each defin
18、ed location (Figure 2, Table 1) for 10 h with sleeper average temperature (see 3.4) to be 22.8 C 2.8 C (73 F 5 F).6.5.2 Day Cab Truck Maintain a minimum day cab temperature 20 C (68 F) at each defined location (Figure 1) for 2.5 h with average temperature (see 3.3) to be 73 F 5 F (22.8 C 2.8 C). At
19、the end of the test, the temperature at each occupant head shall not exceed the temperature at the feet. 6.6 Specification Recommendations If engine-off HVAC system is not factory installed, SAE recommends that fleets have their auxiliary HVAC equipment supplier provide them with performance curves
20、based on the vehicles specifications prior to making any component selection. These specifications should include: cab insulation package, paint color, and the interior cab space to be maintained.6.7 Seat Index Point 6.7.1 Truck Cab and Crew Cab Locate temperature probes at the driver and passenger
21、positions relative to each Seat Index Point (SIP) per Figure 1. SAE J2918 Issued FEB2012 Page 7 of 8 FIGURE 1 - TEMPERATURE PROBE LOCATIONS FOR SEATS 6.8 Sleeper Cab Probe locations for the sleeper cab to be located according to Table 1 and Figure 2. TABLE 1 - TEMPERATURE PROBE LOCATIONS FOR SLEEPER
22、 BUNK. Probe ID Description Horizontal Location Vertical LocationT1 Sleeper Bunk, Passenger Side Top 600 mm from side wall and rear wall 600 mm below ceilingT3 Middle 600 mm from side wall and rear wall 150 mm above mattressT5 Floor 300 mm ahead of bunk, equally spaced between cab wall and T6 300 mm
23、 above floorT2 Sleeper Bunk, Driver Side Top 600 mm from side wall and rear wall 600 mm below ceilingT4 Middle 600 mm from side wall and rear wall 150 mm above mattressT6 Floor 300 mm ahead of bunk, equally spaced between cab wall and T5 300 mm above floorSAE J2918 Issued FEB2012 Page 8 of 8 FIGURE
24、2 - TEMPERATURE PROBE LOCATIONS FOR SLEEPER BUNK 7. NOTES 7.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to th
25、e left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE TRUCK AND BUS WINDSHIELD WIPERS & CLIMATE CONTROL COMMITTEE OF THE SAE TRUCK AND BUS BODY AND OCCUPANT ENVIRONMENT STEERING COMMITTEE
