SAE J1542 pdf download

SAE J1542 pdf download.Laboratory Testing of vehicle and lndustrial Heat Exchangers for Thermal Cycle Durability.
1. This SAE Recommended Practice is applicable to all liquid-to-air, liquid-to-liquid, air-to-liquid, and air- to-air heat exchangers used In vehicle and Industrial cooling systems. This document outlines the tests to determine durability characteristics of the heat exchanger under thermal cyding.
1.1 Purpose—This document Is to provide a test guideline for determining the durability of a heat exchanger under thermal cyde conditions,
2. References
2.1 ApplIcable Publications—The following publications form a part of this specification to the extent specified herein. Unless otherwise specified, the latest issue of SAE publications shall apply.
2.1.1 SAE PusucATloNs—Avallable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J1597—Laboratory Testing of Vehicle and Industrial Heat Exchangers 104 Pressure-Cycle Durability SAE J1598.—taboratory Testing of Vehicle and Industrial Heat Exchangers for Durability Under Vibration
Induced Loading
3. Objective—To vent y compliance with established ci’lteria that insures durability in a specific application. This document describes a system to thermally induce stresses into a heat exchanger at specified rates and temperatures. The process is accomplished by heating and cooling the unit in a specified manner.
4. Facility Requirement—The facility should provide the following as required:
4.1 Source of HOT fluid capable of delivering the fluid to the test unit at specified temperature and pressure.
4.2 Source of COLD fluid capable of delivering the fluid to the test unit at specified temperature and pressure.
4.3 Compressed air at specified pressure and temperature.
4.3.1 Charge air cooler test media.
4.3.2 Determination of product integrity.
5.3.2 HoT”—temperature is specified based on specific application. This temperature to be at least equal to normal operating conditions. The system shall be capable of maintaining this temperature.
5.3.3 HoT-Coto—test temperature differential is based on individual application. A controlled temperature should be maintained within ±6 °C (±11 °F) by controlling either hot or cold source to take advantage of available resources.
5.3.4 Colo—temperature is established by test temperature differential.
5.3.5 The lest cycle and its segments are to be based on specific application and are measured in seconds. The transition time from HOT to COLD will vary depending on test media, test equipment, and test method. One cycle consists of a heating segment and a cooling segrneni. A segment is that time required to bring the outlet temperature to within 5% of inlet temperature. It is desirable to minimize segment duration in order to expedite testing and maximize thermal cyde loading. To this end, and to insure compliance with outlet temperature goals. it may be required to circulate ambient media.
5.3.6 Test ambient temperature is to be specified based on specific application.
5.3.7 Nominal pressures arid pressure rariges observed within the test should be recorded and maintained.
5.4 Run test to specified conditions mutually established between supplier and user or documented on part pnnt. Types of tests are as follows:
5.4,1 New heat exchanger (no previous testing) for comparison to previously established criteria,
5.4.2 Used heat exchanger if specified (document prevous history).
5.5 Remove and check heat exchanger for leaks and structural damage.
6 Test Documentation
6.1 During and after test. document leakage rate and location of leaks as well as compare to acceptance criteria.
6.2 Document the following variables:
a Unit Orientation (Reference 5.2)
b. Maximum Temperature (Reference 5.3.2)
c. Temperature Differential (Reference 5.3.3)
d. Fluid Type
1. Hot(Reference 4.1)
2. Cold (Reference 4.2)
e. Test Ambient (Reference 5.3.6)
f. Unit Pressure Range (Reference 5.3.7)
g. Cycle and Segment Duration (Reference 5.3.5)
ft Number of Cycles to Completion (Reference 5.4)
7. This document is valid for durability comparison of thermal cycle conditions only. Correlation to field results must be developed on Individual basis. Other tests affecting heat exchanger durability are SAE J1597 (pressure cycle) and SAE Ji 598 (vibration). These tests can be run in combination as well as independently.
NOTE—Combination testing may make it difficult to determine cause of failure. & Notes
8.1 Marginal Indicia—The change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report.