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GB/T 38274-2019 English PDF

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GB/T 38274-2019: Lubrication system - Efficiency assessment method
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Basic data

Standard ID: GB/T 38274-2019 (GB/T38274-2019)
Description (Translated English): Lubrication system - Efficiency assessment method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J21
Classification of International Standard: 21.260
Word Count Estimation: 18,110
Date of Issue: 2019-12-10
Date of Implementation: 2020-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 38274-2019: Lubrication system - Efficiency assessment method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Lubrication system--Efficiency assessment method ICS 21.260 J21 National Standards of People's Republic of China Evaluation method of energy efficiency of lubrication system 2019-12-10 release 2020-07-01 implementation State Administration of Market Supervision Published by the National Standardization Management Committee

Contents

Foreword III 1 Scope 1 2 Normative references 1 3 General conditions of test conditions 1 3.1 Test preparation and general test conditions 1 3.2 Lubrication pump test conditions 1 3.3 Cooler test conditions 2 3.4 Electric heater test conditions 2 3.5 Measurement accuracy 2 4 Lubrication system energy efficiency assessment method 2 4.1 Lubrication system energy efficiency evaluation value 2 4.2 Motor Energy Efficiency Assessment Method 3 4.3 Lubrication Pump Energy Efficiency Evaluation Method 3 4.4 Cooler Energy Efficiency Evaluation Method 4 4.5 Evaluation method for energy efficiency of electric heaters 6 Appendix A (Informative) Schematic diagram of energy efficiency test for lubrication pumps 8 Appendix B (Informative) Schematic diagram of energy efficiency test installation of lubrication pump 9 Appendix C (Informative) Schematic of Energy Efficiency Test for Cooler 10 Appendix D (Informative) Schematic of Energy Efficiency Test Installation for Cooler 11 Appendix E (Informative) Schematic Diagram of Energy Efficiency Test Installation for Electric Heaters 12

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed and managed by the National Metallurgical Equipment Standardization Technical Committee (SAC/TC409). This standard was drafted. Sichuan Chuanrun Hydraulic Lubrication Equipment Co., Ltd., Taiyuan Tongze Heavy Industry Co., Ltd., Anhui Zhongtian Petrochemical Co., Ltd. Co., Ltd., Qidong Lubrication Equipment Co., Ltd., China Heavy Machinery Research Institute Co., Ltd. The main drafters of this standard. Liu Fulan, Wang Pengfei, Gao Xiaomou, Zhu Qiang, Wang Xinyu, Wu Guobin, Gong Xiangrong, Su Jing, Xia Juan. Evaluation method of energy efficiency of lubrication system

1 Scope

This standard specifies the energy efficiency assessment method for lubrication systems (including main components such as lubrication pumps, coolers and electric heaters). This standard is applicable to the energy efficiency evaluation of mass-produced lubrication systems, and other lubrication devices can also be used as a reference.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 14039-2002 Code for pollution degree of solid particles in hydraulic transmission oil GB 18613-2012 Small and medium-sized three-phase asynchronous motors

3 General conditions of test conditions

3.1 Test preparation and general test conditions 3.1.1 Develop a test outline. 3.1.2 The test equipment should be checked for correctness and functional suitability before the test. Period. 3.1.3 Check the valve and control system of the system under test to eliminate factors that affect normal testing. 3.1.4 Power supply. voltage fluctuation ± 5%, frequency fluctuation ± 1%. 3.1.5 The kinematic viscosity of the test lubricating oil is 288mm2/s ~ 352mm2/s (at the temperature of 40 ℃). 3.1.6 The solid particle pollution level of the test oil shall meet the requirements of-/ 20/17 ~-// 21/18 in Table 1 of GB/T 14039-2002. 3.2 Lubrication pump test conditions 3.2.1 During the test, the oil temperature shall be 40 ° C ± 3 ° C. 3.2.2 Use the torque and speed sensor to detect the torque and speed of the input end of the tested lubrication pump. Torque and speed sensors are installed horizontally, using When the rigid coupling is used, the coaxiality of the pump device must be less than 0.05mm; when the flexible coupling is installed, the coaxiality of the pump device must be less than 0.05mm. 0.2mm. The installation diagram of the torque speed sensor is shown in Figure 1. Figure 1 Schematic diagram of the torque speed sensor installation 3.3 Cooler test conditions 3.3.1 The inlet temperature of the cooling medium (cooling water) of the cooler is 28 ℃ ± 2 ℃. 3.3.2 The flow rate of the cooling medium (cooling water) of the cooler is 1.5 times the flow rate of the cooling medium (lubricating oil). 3.3.3 The relative error of heat balance should be less than 5%. The calculation of the relative error of the heat balance is shown in equation (8). 3.4 Electric heater test conditions 3.4.1 The volume of the test fuel tank is 1.2m3, and the lubricating oil inside the tank is 1m3. 3.4.2 The lubricating oil is heated from an initial temperature of 10 ° C ± 2 ° C to 25 ° C ± 2 ° C. 3.4.3 The ratio of the electric energy loss of the electric heater to the total electric energy should be less than 5%. The calculation is shown in equation (15). 3.5 Measurement accuracy The allowable error of measuring instruments and meters should be within the range specified in Table 1. Table 1 Allowable errors of measuring instruments and meters Measurement category unit instrument, meter reading accuracy Temperature ℃ ± 1.0% Pressure MPa ± 1.6% Flow L/min ± 1.5% Torque N · m ± 1.0% Speed r/min ± 1.0%

4 Evaluation method of energy efficiency of lubrication system

4.1 Evaluation of energy efficiency of lubrication system The energy efficiency evaluation value of the lubrication system is supplied to the host by the energy efficiency evaluation value of the motor, lubrication pump, cooler, and electric heater. The degree of compliance of the required lubricant is determined, and the calculation formula is shown in formula (1). Et = ηemηepηecηehηstd (1) Where. Et --- energy efficiency evaluation value of lubrication system,%; ηem --- motor energy efficiency evaluation value,%; ηep --- the total efficiency of the lubrication pump,%; ηec --- heat exchanger efficiency,%; ηeh --- Heating efficiency of electric heater,%; ηstd --- the deviation of the lubricating oil supplied by the lubrication system in accordance with the required degree,%. 4.2 Motor energy efficiency assessment method The motor energy efficiency assessment test method shall be implemented in accordance with the requirements of Chapter 5 of GB 18613-2012, and the motor energy efficiency assessment value shall meet The provisions of 4.3 in GB 18613-2012. 4.3 Lubrication pump energy efficiency assessment method 4.3.1 Instructions for energy efficiency assessment of lubrication pumps The energy efficiency evaluation of the lubrication pump is described as follows. a) Test the volumetric efficiency and mechanical efficiency of the lubrication pump under the set conditions, and calculate the total efficiency of the lubrication pump. The total efficiency of the lubrication pump The value is used as the energy efficiency evaluation value of the lubrication pump. b) Refer to Appendix A for the schematic diagram of the lubrication pump energy efficiency test, and refer to Appendix B for the schematic diagram of the lubrication pump energy efficiency test. 4.3.2 Test methods and calculations 4.3.2.1 Treat the flow of the lubrication pump at zero pressure difference as the theoretical flow. Start the tested lubrication pump and adjust the outlet pressure of the lubrication pump. When the outlet pressure is approximately zero (≤0.05MPa), record the flow rate of the pump at this time, and record the flow rate of the lubrication pump at zero pressure difference as Q0. 4.3.2.2 Calibrate and adjust the outlet pressure of the lubrication pump to the maximum working pressure of the lubrication system. Q, the speed of the pump is recorded as n, and the torque of the pump is recorded as T. 4.3.2.3 The principle of performing three measurements on each parameter and taking the average value to participate in the calculation. 4.3.2.4 The ratio of the actual output power of the lubrication pump after the volume loss to the theoretical output power of the lubrication pump is called the volumetric efficiency. The method is shown in formula (2). ηv = QΔp Q0Δp × 100% = Q0 × 100% (2) Where. ηv --- volumetric efficiency of the lubrication pump,%; Q --- the actual flow of the pump, the unit is liters per minute (L/min); Δp --- the differential pressure between the inlet and outlet of the lubrication pump, in megapascals (MPa); Q0 --- The flow rate of the lubrication pump at zero pressure difference, the unit is liters per minute (L/min). 4.3.2.5 The actual input power Pr of the lubrication pump is calculated as shown in equation (3). Pr = n × T (3) Where. Pr --- the actual input power of the lubrication pump, in kilowatts (kW); n --- the speed of the lubrication pump in revolutions per minute (r/min); T --- the torque of the lubrication pump, the unit is Nm (N · m). 4.3.2.6 The ratio of the theoretical output power of the lubrication pump to its actual input power is called the mechanical efficiency of the lubrication pump. The calculation method is shown in equation (4). ηm = Q0 × Δp Pr × 100% (4) Where. ηm --- mechanical efficiency of the lubrication pump,%. 4.3.2.7 The ratio of the actual output power to the input power of the lubrication pump is called the total efficiency of the pump. Total pump efficiency ηep is equal to volumetric efficiency and mechanical The product of efficiency is calculated as shown in equation (5). ηep = ηvηm (5) Where. ηep --- the total efficiency of the pump,%. 4.4 Evaluation method of energy efficiency of cooler 4.4.1 Energy efficiency assessment instructions for coolers Description of cooler energy efficiency assessment. a) Lubrication system cooler usually adopts non-phase change, counter-flow type partition wall cooler. Lubrication system cooler energy efficiency assessment applies to Non-phase change, counter-flow type inter-wall cooler. b) The energy efficiency of the cooler is evaluated by its heat exchange efficiency, and the value of the heat exchanger efficiency of the cooler is used as the energy efficiency evaluation value of the cooler. c) Refer to Appendix C for the energy efficiency test schematic diagram of the cooler, and refer to Appendix D for the energy efficiency test installation diagram of the cooler. 4.4.2 Test methods and calculations 4.4.2.1 Calculation of exothermic heat of lubricating oil and endothermic heat of cooling water. a) The exothermic heat of lubricating oil is calculated according to formula (6). Q1 = qm1c1 (t'1-t ″ 1) = W1 (t'1-t ″ 1) (6) Where. Q1 --- exothermic heat of lubricating oil, unit is watt (W); qm1 --- mass flow of lubricating oil, unit is kilogram per second (kg/s); c1 --- Constant pressure specific heat capacity of lubricating oil, unit is joule per kilogram Celsius [J/(kg · ℃)]; t'1 --- lubricating oil inlet temperature, unit is Celsius (° C); t ″ 1 --- temperature of lubricating oil output, in degrees Celsius (° C); W1 --- The thermal capacity of lubricating oil, in watts per degree Celsius (W/℃). b) The heat absorbed by the cooling water is calculated according to formula (7). Q2 = qm2c2 (t ″ 2-t'2) = W2 (t ″ 2-t'2) (7) Where. Q2 --- heat absorption heat of cooling water, unit is watt (W); qm2 --- mass flow of cooling water, unit is kilogram per second (kg/s); c2 --- specific heat capacity of constant pressure of cooling water, unit is joule per kilogram Celsius [J/(kg · ℃)]; t'2 --- cooling water inlet temperature, unit is Celsius (° C); t ″ 2 --- cooling water outlet temperature, unit is degrees Celsius (℃); W2 --- The heat capacity of cooling water, the unit is watt per degree Celsius (W/℃). 4.4.2.2 The formula for calculating the relative error of heat balance is shown in equation (8). ΔQ = Q1-Q2 Q2 × 100% (8) Where. ΔQ --- Relative error of heat balance,%. 4.4.2.3 Calculation of cooler heat transfer efficiency. a) The heat transfer efficiency of the cooler is the ratio of the actual heat transfer heat Q to the theoretical maximum heat transfer heat Qmax. The calculation formula is as shown in formula (9) As shown. ηec = Qmax × 100% = W1 (t'1-t ″ 1) W min (t'1-t'2) × 100% = W2 (t ″ 2-t'2) W min (t'1-t'2) × 100% (9) Where. ηec --- heat exchanger efficiency,%; Q --- the actual heat transfer heat of the cooler, in watts (W) Qmax --- the theoretical maximum heat transfer heat of the cooler, in watts (W); W min --- minimum thermal capacity (the smaller of W1 and W2), the unit is watt per degree Celsius (W/℃). When qm1c1 = W1 = W min, calculate according to formula (10). ηec1 = t'1-t ″ 1 t'1-t'2 × 100% (10) Where. ηec1 --- W1 is the cooler heat transfer efficiency when the value is small,%. When qm2c2 = W2 = W min, calculate according to formula (11). ηec2 = t ″ 2-t'2 t'1-t'2 × 100% (11) Where. ηec2 --- W2 is the cooler heat transfer efficiency when the value is small,%. b) The theoretical maximum heat transfer heat Qmax of the cooler can only be achieved in a counterflow heat exchanger with an infinite heat transfer area. At this point, the heat The fluid can theoretically be cooled to t ″ 1 = t'2, (as shown in Figure 2), which is the maximum cooling that hot fluid can achieve; or cold fluid Theoretically, it can be heated to t ″ 2 = t'1, which is the maximum degree of heating that a cold fluid can achieve. Therefore, the temperature difference (t'1-t'2) is a hot fluid or Figure 2.Maximum temperature difference in a counterflow type partition cooler 4.4.2.4 It is known from 3.3.2 and the constant pressure specific heat capacity of the lubricating oil is less than the constant pressure specific heat capacity of the cooling water that W1 \u003cW2。 Therefore, the formula for calculating the heat exchange efficiency of the cooler of the lubrication system is shown in equation (12). ηec = ηec1 = t'1-t ″ 1 t'1-t'2 × 100% (12) 4.5 Evaluation method of energy efficiency of electric heater 4.5.1 Evaluation of energy efficiency of electric heaters The energy efficiency evaluation of electric heaters is described as follows. a) The energy efficiency of electric heaters is evaluated by the heating efficiency of electric heaters. The heating efficiency value of electric heaters is used as the energy efficiency of electric heaters. Evaluation value b) Refer to Appendix E for the schematic diagram of the energy efficiency test installation of electric heaters. 4.5.2 Test methods and calculations 4.5.2.1 Measure the temperature rise of heating oil of electric heater. The temperature rise of heating oil of electric heater For the temperature measuring element, the distance between the three temperature measuring elements and the electric heater is 100mm, and the average of the three measurements is taken. 4.5.2.2 The measurement of heating time shall comply with the requirements of 3.4.2, measuring the heating time T when the electric heater heats the lubricating oil to 25 ° C. 4.5.2.3 The method for calculating the power of electric heaters is as follows. a) Use a multimeter to measure the resistance of the electric heater. b) Use a multimeter to measure the voltage of the electric heater during operation. c) Calculate the power of the electric heater, see equation (13). P = U2 1000R (13) Where. P --- the power of the electric heater in kilowatts (kW); U --- the voltage when the electric heater works, the unit is volt (V); R --- the resistance of the electric heater, the unit is Europe (Ω). d) Calculate the heat dissipation power of the fuel tank according to formula (14). Pd = kAΔt (14) Where. Pd --- the cooling power of the fuel tank, in kilowatts (kW); k --- coefficient of heat dissipation in watts per square meter Celsius [W/(m2 · ℃)]; A --- The heat radiation area of the fuel tank, the unit is square meter (m2); Δt --- The temperature rise of the lubricating oil, the unit is Celsius (℃). e) The heat dissipation coefficient k is related to the ventilation, see Table 2. Table 2 Heat dissipation coefficient of fuel tank k Cooling conditions heat dissipation coefficient k/[W/(m2 · ℃)] Integral fuel tank or squeezed fuel tank 11 ~ 28 Steel oil tank in normal air 28 ~ 57 Well-ventilated fuel tanks 57 ~ 74 Fuel tanks with forced ventilation around 142 ~ 341 f) Calculate the ratio of the power loss of the electric heater to the total power, see equation (15). ηad = PdT PT × 100% = Pd P × 100% (15) Where. ηad --- the ratio of the power loss of the electric heater to the total power,%; T --- heating time in seconds (s). g) Calculate the heating efficiency of the electric heater, see equation (16). ηeh = cρVΔt 1000TP × 100% (16) Where. ηeh --- heating efficiency of electric heater,%; c --- Constant pressure specific heat capacity of lubricating oil, unit is joule per kilogram Celsius [J/(kg · ℃)]; ρ --- density of lubricating oil, unit is kilogram per cubic meter (kg/m3); V --- the volume of oil in the tank, the unit is cubic meters (m3); Δt --- temperature rise of oil when heating, unit is Celsius (° C); P --- The power of the electric heater, in kilowatts (kW).

Appendix A

(Informative appendix) Lubrication pump energy efficiency test schematic diagram The schematic diagram of the energy efficiency test of the lubrication pump is shown in Figure A.1. Explanation. 1 --- electric control cabinet; 2 --- ball valve; 3 --- tested lubrication pump; 4 --- torque speed sensor; 5 --- electric motor; 6 --- check valve; 7 --- thermometer; 8 --- pressure gauge; 9 --- throttle valve; 10 --- flow transmitter. Note 1. Lubrication system energy efficiency test device consists of two parts. the circulation system and the test system. Note 2. Lubrication pump energy efficiency test (total lubrication pump efficiency) circuit. Circulation system tank → 2 ball valve → 3 tested lubrication pump → 6 check valve → 9 throttle valve → 10 flow transmitter → return tank. Figure A.1 Schematic diagram of energy efficiency test of lubrication pump

Appendix B

(Informative appendix) Lubrication pump energy efficiency test installation diagram The installation diagram of the energy efficiency test of the lubrication pump is shown in Figure B.1. Figure B.1 Schematic diagram of energy efficiency test installation of lubrication pump

Appendix C

(Informative appendix) Cooler energy efficiency test schematic diagram The schematic diagram of the cooler energy efficiency test is shown in Figure C.1. Explanation. 1 --- electric control cabinet; 2 --- ball valve; 3 --- lubrication pump; 4 --- torque speed sensor; 5 --- electric motor; 6 --- check valve; 7 --- throttle valve; 8 --- thermometer; 9 --- pressure gauge; 10 --- tested cooler; 11 --- throttle valve; 12 --- flow transmitter; 13 --- water tank; 14 --- electric heater; 15 --- water pump 1; 16 --- motor; 17 --- throttle valve; 18 --- flow transmitter; 19 --- water pump 2; 20 --- motor; 21 --- throttle valve; 22 --- ball valve; 23 --- cooler; 24 --- ball valve; 25 --- ball valve. Note 1. Lubrication system energy efficiency test device consists of two parts. the circulation system and the test system. Note 2. Cooler energy efficiency test circuit. --- Heat medium (lubricating oil) circuit. oil tank of circulation system → 2 ball valve → 3 lubrication pump → 6 check valve → 10 tested cooler → 11 throttle valve → 12 ......
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