BS ISO 21441:2019 pdf download – Road vehicles — Engine EGR cooler — Heat dissipation test methods
This document defines the methodology for the measurement of heat dissipation and pressure loss of liquid cooled engine EGR coolers in internal combustion engines for road vehicles. The principles of this document are valid for clean and fouled EGR coolers.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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technology that recirculates a portion of an engine’s exhaust gas back into the intake to control the concentration of oxygen taken into the engine
gas that has been extracted from the exhaust gas and is passed through the EGR cooler (3.5) core (3.14)
pressurized air or exhaust gas made by burners used in place of real EGR gas (3.2) during the heat dissipation performance test and when measuring EGR gas pressure loss (3.10)
water or coolant mixture during the heat dissipation performance test and when measuring cooling liquid pressure loss (3.11)
liquid cooled heat exchanger for cooling the EGR gas (3.2)
EGR gas heat dissipation amount
amount of heat lost by the test gas (3.3) during the heat dissipation performance test Note 1 to entry: The EGR gas heat dissipation amount is expressed in kilowatts (kW).
b) EGR gas pressure loss;
c) cooling liquid pressure loss.
5 Test setup
5.1 Test conditions
The EGR cooler, test gas, cooling liquid, and test location conditions are shown as follows.
In the case of measurement with the fouled EGR cooler, test conditions should be agreed by the parties concerned.
a) EGR cooler:
The EGR cooler consists of main components such as the core, tank, flanges, and pipes, as well as supplementary parts. An example is shown in Figure 1.
b) Test gas: Tests shall be run with a test gas inlet temperature, an inlet pressure and a mass flow rate that are defined upon the agreement by the parties concerned.
c) Cooling liquid: Water used in the cooling liquid should be demineralized or treated. In the case of using a coolant mixture as the cooling liquid, the coolant type and properties of the mixture should be documented. The used fluid shall be regularly checked to confirm that the coolant mixture or properties haven’t changed.
d) Test location: Unless otherwise specified, the test location shall be kept at room temperature (5 °C to 35 °C) and normal relative humidity (20 % to 85 %).
5.2 Test equipment
5.2.1 General test equipment The test equipment shall be set up so that it can accurately measure the measurement items in 6.1. From the perspective of the test gas side structure, the test equipment can be roughly divided into two types: open type and sealed type. Both types consist of test gas and cooling liquid circuits. For sealed type test equipment, the test gas inlet pressure shall be set upon the agreement by the parties concerned.
5.2.2 Test gas circuit equipment
The test gas circuit equipment shall be set up as follows.
a) The mass flow rate of the test gas that passes through the EGR cooler shall be adjustable.
b) The test gas inlet temperature shall be adjustable over the entire range of the test.
c) The measuring instrument of the test gas inlet pressure and the test gas differential pressure between the outlet and the inlet shall not be affected by the dynamic pressure and shall be
connected so as not to disturb the flow of the test gas as much as possible.
5.2.3 Cooling liquid circuit equipment
The cooling liquid circuit equipment shall be set up as follows.
a) The mass flow rate of the cooling liquid that passes through the EGR cooler shall be adjustable.