GB/T 47007-2026Energy efficiency test and evaluation rules for plate heat exchangers (English PDF)

3.1 Energy efficiency index

Parameters used to assess the energy efficiency of plate heat exchangers, determined by integrating their heat transfer and flow resistance characteristics - and based on the First Law of Thermodynamics - through methods such as the mathematical and statistical analysis of test data.

NOTE: The English abbreviation and parameter symbol are EEI.

5.1 Test platform

5.1.1 The platform utilized for conducting energy efficiency tests on plate heat exchangers shall be equipped with a dedicated test site and the requisite supporting facilities, including water, electricity, heat sources, and cold sources. The test system shall comply with the requirements specified in GB/T 27698.1. The test fluid shall consist of clean fresh water, and the testing shall be conducted under water-to-water counter-flow conditions without phase change. The flow rates of both the cold and hot fluids within the test system shall fall within the specified flow rate range required for testing the plate heat exchanger. The test conditions shall be adjustable and capable of being maintained in a steady state. Furthermore, the test data shall be accurate, reliable, and capable of being automatically acquired and stored.

5.1.2 The accuracy of pressure and differential pressure measuring instruments shall be no lower than level 0.2. The accuracy of flow measuring instruments shall be no lower than level 0.5. The permissible error of fluid temperature measuring instruments shall not exceed ±0.5°C. Measuring instruments shall be used within the validity period of their verification (calibration).

5.2 Testing and evaluation institution

Organizations engaged in the energy efficiency testing and evaluation of plate heat exchangers shall possess the capability to verify the structural parameters of the heat exchanger plates, as well as the capability to conduct energy efficiency testing and evaluation. They shall be equipped with the necessary instrumentation, equipment, and personnel to meet the requirements for such testing and evaluation, strictly control the quality of the energy efficiency tests, and assume responsibility for the accuracy, impartiality, and traceability of the test results.

7.1 Test methods

7.1.1 Measurement parameters

During testing, at least the following parameters shall be measured.

a) Volumetric flow rate or mass flow rate of the cold and hot fluids;

b) Inlet and outlet temperatures of the cold and hot fluids;

c) Inlet pressure of the cold and hot fluids, and the pressure drop between the inlet and outlet.

7.1.2 Test procedure

The inlet temperatures of the hot and cold fluids shall be adjusted - using a heater or cooler, respectively - to 60°C ±0.5°C and 30°C ±0.5°C. Once the flow and heat transfer have stabilized, the test shall be conducted under the following conditions.

a) For the first set of operating conditions, the fluid velocities on both sides shall vary uniformly. The velocity variation range shall be between 0.1 m·s-1~0.9 m·s-1, with increments of 0.1 m·s-1.The number of distinct velocity conditions tested shall be no fewer than seven, and the specific test velocities shall be mutually agreed upon by the supplier and the purchaser.

b) For the second set of operating conditions, the flow velocity of the fluid on one side (either the hot or cold side) is held constant; this fixed point shall be set at 0.5 m·s-1.The flow velocity of the fluid on the other side shall be varied within the range of 0.1 m·s-1~0.9 m·s-1, with increments of 0.1 m·s-1.The number of distinct flow velocity conditions tested shall be no fewer than seven, and the specific test velocities shall be mutually agreed upon by the supplier and the purchaser.

c) Measurements shall be repeated at least 3 times for each test condition, with an […]