BS IEC 63277-2021 Binary power generation systems with capacity less than 100 kW – Performance test methods.
4 Construction, power of binary power generation system
4.1 General construction of binary power generation system
The binary power generation system consists of evaporator, expander, condenser,working fluid pump, and generator as shown in Figure 1 .
A system in which a working fluid having a low boiling point is heated by the hot water and the expander is driven by the working fluid gas to generate electricity. The heat source is hot water and cooling source is cooling water. See Annex A for the informative specification for grid-connected inverter.
4.2 Net power (Sending-end output) / Gross power (Generating power)
The sending-end output shall be the net power output of the system deducting the internal power consumed, such as the working fluid pump, grid-connected inverter, auxiliaries in the system from the gross power. And the gross power output shall be from the generator terminal.
5 Test condition
5.1 General test condition
General test conditions from Test 1 to Test 6 are shown in Table 1 . Moreover, the tests provide a validation of nominal performance declared by the manufacturer datasheet (test condition 7).
All the measured values of Y1 kW to Y6 kW shall be recorded, unless specifically required by the manufacturer.
The generating power is measured with a combination of 6 temperature points.
5.2 Rated test condition
The rated values (performance) shall be evaluated under the conditions of Test 1 in Table 1 , at hot water temperature of 90 °C ± 1 °C and cooling water temperature of 20 °C ± 1 °C.
If the manufacturer defines the rated value under its own operating conditions other than the specified test conditions, the manufacturer shall specify the test conditions as shown in Test 7
of Table 1 , and evaluated as rated value.
5.2.2 Tolerance of the rated net power
The measured rated net power shall be within ±1 0 % of rated net power stated in the specification brochure of the manufacturer.
5.3 Accuracy of instruments used for measurement
The accuracy of a thermometer used for measurement shall be ± 0,1 °C.
The accuracy of a flowmeter used for measurement shall be ± 2 %.
5.3.3 Three-phase power meter
The accuracy of a three-phase power meter used for measurement shall be ± 0,2 %.
Calibration shall be conducted according to the calibration standards of each measuring instrument for ensuring the traceability.
6 Measurement and calculation method of power output and power generation efficiency
6.1 Measurement method of net power (sending-end output)
The performance measuring method of the binary power generation system is shown in Figure 2.
The net power shall be measured under the test conditions described in 5.1 and 5.2.
The net power (sending-end power) shall be measured after the grid-connected inverter. It can be also obtained from the gross power measured after the generator deducting all of the internal power consumed, such as the working fluid pump, grid-connected inverter, and auxiliaries in the system.
Measurement begins after reaching steady state operation.
The system is considered in steady state when measured test condition quantities are within the accuracy of the stated range, and power output measured fluctuation is stable.BS IEC 63277 pdf download.