GB/T 19141-2026Specification for domestic solar water heating systems (English PDF)

5.2 Product Marking

5.2.1 Marked Content The product marking of a household solar water heating system consists of the following six parts, separated by "-", as shown in Figure 2.

5.2.2 Tagging Example The following is an example of product labeling for a residential solar water heating system.

a) A compact, direct-type system using an all-glass vacuum tube, with the heat transfer medium inside the glass tube, rated water capacity of 150L, and a contoured light-transmitting area. Taking a household solar water heating system with a capacity of 2.00m^2, a rated working pressure of 0.05MPa for heat storage, and a serial number of 1 as an example, the following is a notation.

b) Using a flat plate, with the heat transfer medium inside a metal tube, a separate, indirect type, with a rated water capacity of 100L and a contour lighting area of 1.80m^2. Taking a household solar water heating system with a rated working pressure of

0.6 MPa and serial number 1 as an example, it is marked as follows:

6.1 Components

6.1.1 Solar collectors Flat-plate solar collectors used in domestic solar water heating systems should meet the requirements of GB/T 6424; evacuated tube solar collectors... The heater should meet the requirements of GB/T 17581.

6.1.2 Vacuum Solar Collector Tube All-glass vacuum solar collector tubes should meet the requirements of GB/T 17049; glass-metal sealed heat pipe vacuum solar collector tubes should meet the requirements of GB/T 17049. The requirements of GB/T 19775 shall apply; all-glass heat pipe vacuum solar collectors shall comply with the requirements of GB/T 26975.

6.1.3 Pipelines The insulation of pipelines should comply with the requirements of GB/T 4272.If self-regulating electric heating tape is used for the pipeline, its performance should comply with GB/T 19835. Requirements.

6.1.4 Circulation Pump The circulating pump shall meet the requirements of GB/T 4706.66.

6.1.5 Heat Exchanger The heat exchanger should have good compatibility with the heat transfer medium and should not pollute the water, such as the hardness of the water in a household solar water heating system. In areas where the water temperature exceeds 60°C after being heated by a hot water system, a water softening system should be installed, and the system's instruction manual should specify regular cleaning procedures. The content.

6.1.6 Controller The controller used in a household solar water heating system should comply with the requirements of GB/T 23888.

6.1.7 Exhaust valve The pressure rating, temperature resistance, exhaust speed, and compatibility with the heat transfer medium of the exhaust valve should meet the system requirements.

6.1.8 Expansion Tank The materials used in the expansion tank components of a domestic solar water heating system should be compatible with the heat transfer medium, and the pre-charge pressure of the expansion tank should be compatible with the system's static pressure. The expansion tank should be compatible with the system's operating temperature, and its temperature resistance should be adapted to the pressure requirements.

6.2 Resistance to external influences

6.2.1 Weather resistance All components of a residential solar water heating system exposed outdoors should have good weather resistance, enabling the system to withstand the extreme temperatures of the location of use. It should be designed for use in warm and low temperature environments, and its service life should not be less than 10 years.

6.2.2 Wind resistance The outdoor portion of a residential solar water heating system should have reliable wind-resistant measures, which should be clearly described in the product manual.

6.2.3 Lightning Protection When a residential solar water heating system is installed outside the protection zone of a building's lightning protection system, additional measures should be taken in accordance with the provisions of GB 50057. Lightning protection measures should be implemented.

7.1 Appearance

7.1.1 The transparent cover of the flat-plate solar collector used in the system should be free from cracks; the all-glass vacuum solar collector tube should comply with GB/T 17049. The glass tubes of glass-metal sealed heat pipe vacuum solar collectors should meet the requirements of GB/T 19775.All-glass heat pipe vacuum... Solar collector tubes should meet the requirements of GB/T 26975.

7.1.2 The color of the heat absorber coating should be uniform, without peeling, cracking, or flaking.

7.1.3 The external surface of the hot water storage tank of a household solar water heating system should be flat and free from scratches, dirt and other defects.

7.1.4 The deviation between the nominal outline lighting area and the actual outline lighting area should be within ±3.0%.

7.1.5 Domestic solar water heating systems should have a clear and indelible label in a prominent location. The product label should include the following.

a) Manufacturer;

b) Product Name;

d) Product model;

e) Outline lighting area;

f) Hot water tank capacity;

g) Operating pressure of the hot water storage tank and heat exchanger;

h) Manufacturing date or production batch number;

i) The material and nominal thickness of the water tank liner;

j) Insulation material and thickness of the water tank;

7.2 Hot water storage tank

7.2.1 When the inner liner of the water tank is made of cold-rolled stainless steel, its performance shall meet the requirements of GB/T 3280, and the allowable difference between the inner liner thickness and the nominal thickness shall be... The deviation should meet the requirements of Table

2.The permissible deviation between the enamel liner and the nominal thickness indicated on the marking for other types of liner materials should be ±10%. Within.

7.2.2 The deviation between the nominal displayed value and the measured value of the water capacity of the closed hot water storage tank shall be within ±3.0%. The tank shall be equipped with an open outlet. The deviation between the nominal display value and the measured value of the water capacity of the hot water storage tank is within ±5.0%.

7.2.3 A drain outlet shall be provided at an appropriate location in the hot water storage tank; for domestic solar water heating systems using open-type hot water storage tanks, a drain outlet shall be provided at an appropriate location in the hot water storage tank. An overflow outlet and a vent should be provided in appropriate locations on the tank. The interfaces on the hot water storage tank should be clearly marked, and the markings should not be located on replaceable parts. On the item.

7.2.4 For compact household solar water heating systems with auxiliary electric heating, the installation location of the auxiliary electric heating should be clearly marked on the hot water storage tank. The installation location of auxiliary electric heating in other types of household solar water heating systems should be marked.

7.3.1 Safety relief valve

7.3.1.1 A safety pressure relief valve should be installed in a closed-loop household solar water heating system.

7.3.1.2 The safety relief valve should be able to withstand the highest operating temperature of the heat transfer medium.

7.3.1.3 The size of the safety relief valve should be able to release the maximum hot water flow or the maximum possible steam flow.

7.3.2 Connecting pipe between safety relief valve and expansion tank

7.3.2.1 The connection pipe between the safety relief valve and the system must not be closed.

7.3.2.2 If the domestic solar water heating system is equipped with a safety relief valve and an expansion tank connection pipe, then the connection between the safety relief valve and the expansion tank... The pipe size should be such that, under conditions of maximum hot water flow or maximum possible steam flow, the pressure anywhere in the collector circuit should not exceed [a certain value]. Exceeding the maximum permissible pressure value.

7.3.2.3 The outlet of the safety relief valve should be appropriately arranged to ensure that the steam or heat transfer medium ejected from the safety relief valve will not harm people or the surrounding environment. To prevent any danger to the environment.

7.3.2.4 The connection of safety relief valves and expansion tanks and the laying of pipelines should avoid the deposition of any dirt, scale or similar impurities.

7.3.3 Drain pipe If a household solar water heating system has a drain pipe installed, the installation of the drain pipe should ensure that the pipe does not freeze and is not damaged. Waterlogged area.

7.4 Pressure Resistance

7.4.1 For systems employing open-type or open-top hot water storage tanks, the rated working pressure of the hot water storage tank should not be less than

0.05 MPa, and the pressure resistance should be... There should be no expansion, deformation, leakage or cracking after the test.

7.4.2 For systems using closed-type hot water storage tanks, the rated working pressure of the hot water storage tank should not be less than

0.6 MPa, and there should be no expansion after the pressure test. Swelling, deformation, leakage, or rupture.

7.4.3 The hot water storage tank shall adopt a jacketed heat exchanger, and the rated working pressure of the heat exchanger shall not be less than

0.25 MPa; the hot water storage tank shall adopt a coil type... For heat exchangers of the inner tank type and other types, the rated working pressure should not be less than

0.6 MPa, and there should be no expansion or deformation after the pressure test. Leakage or rupture.

7.5 Thermal properties

7.5.1 The thermal performance of domestic solar water heating systems shall meet the following requirements.

a) When the daily solar irradiance is 17 MJ/m^2, the temperature of the water in the hot water storage tank of the solar water heating system at the end of the heat collection period is not... Below 65°C, the water temperature in the storage tank of other types of solar water heating systems should not be lower than 45°C at the end of the heat collection process. Compact The daily usable heat gain of both direct-type and semi-direct-type solar water heating systems shall not be less than

8.0 MJ/m2; the daily usable heat gain of separate direct-type (split-type single-loop) solar water heating systems shall not be less than

8.0 MJ/m2. The daily usable heat gain of the solar water heating system shall not be less than

7.4 MJ/m2; the daily usable heat gain of the separate indirect solar water heating system shall not be less than

7.4 MJ/m2. The daily usable heat gain of a solar water heating system for heating shall not be less than

7.1 MJ/m2; the daily usable heat gain of a solar water heating system for heating shall not be less than

b) The average heat loss factor of a solar water heating system with indirect sunlight exposure is no greater than

50.0 W/(m^3·K). Other types of domestic solar water heating systems... The average heat loss factor of the hot water system is no greater than

c) Provide the daily usable heat gain of a domestic solar water heating system in kilowatt-hours per unit of outline light-receiving area.

7.5.2 The thermal performance of air source heat pump assisted household solar water heating systems shall meet the requirements of GB/T 23889.

7.5.3 The thermal performance of domestic solar water heating systems with electric auxiliary energy shall meet the requirements of GB/T 25966.

7.6 Water Quality Hot water provided by a household solar water heating system should be free of rust and odor.

7.7 Overheat protection

7.7.1 A household solar water heating system should be able to operate normally under conditions of high solar irradiance and no large heat consumption.

7.7.2 When a domestic solar water heating system discharges a certain amount of steam or hot water through a component as an overheat protection measure, the discharge of steam should not cause damage. Steam or hot water could pose a danger to users.

7.7.3 Domestic solar water heating systems should have overheat protection measures, which should be indicated in the product instruction manual. clear.

7.7.4 The domestic solar water heating system shall be tested in accordance with the provisions of 8.7, and the system shall operate normally.

7.7.5 For solar water heating systems that provide users with hot water temperatures exceeding 60°C, the instruction manual should remind users to prevent scalding.

7.8 Electrical Safety The electrical safety of electrical equipment in household solar water heating systems shall comply with the requirements of GB/T 4706.1 and GB 8877; Electrical equipment used in hot water systems should have safety measures such as leakage protection, grounding, and power-off protection; household air source heat pumps with auxiliary solar thermal power... The electrical safety of water systems shall meet the requirements of GB/T 23889, and the electrical safety of domestic solar water heating systems with electric auxiliary energy shall meet the requirements of GB/T 23889. It meets the requirements of GB/T 25966.

7.9 Dry sun exposure The system should be free from damage or aging.

7.10 External thermal shock After two external thermal shock tests, the household solar water heating system should not show any cracks, deformation, condensation, or immersion.

7.11 Rain Rainwater should not be allowed to enter the collectors/components, water tanks, vents, or drains of a household solar water heating system.

7.12 Internal thermal shock A single internal thermal shock test should be conducted. Household solar water heating systems should not exhibit cracks, deformation, condensation, or immersion.

7.13 Anti-backflow Household solar water heating systems should have measures to prevent backflow.

7.14 Freeze-resistant

7.14.1 After the freeze resistance test, the domestic solar water heating system should not have any leaks, breaks, deformations, or damage; the vent valve and overflow valve on the water heater/system should also be checked. The pipes should not be frozen.

7.14.2 The freezing point temperature of the antifreeze used in the collector circuit of a domestic solar water heating system should meet the system's operating requirements.

7.15 Strength and stiffness of the support frame The support frame for a household solar water heating system should have sufficient strength, rigidity, and a certain degree of corrosion resistance.

7.16 Impact Resistance After the impact test, the heat collection components of a household solar water heating system should not be damaged.

7.17 Resistance to negative pressure impact Domestic solar water heating systems using closed-loop hot water storage tanks should be able to withstand vacuum shocks that occur during normal use. During an impact, the container should not undergo deformation that would compromise safety.

7.18 Pulse Pressure A household solar water heating system using a closed-loop hot water storage tank can withstand at least 100,000 pulse pressure tests on its heating elements and storage water. The tank should be leak-free, and the hot water storage tank should be free from obvious deformation and cracks.

8.1 Appearance

8.1.1 Inspect the appearance and markings of the household solar water heating system in accordance with the provisions of 7.1.The length measuring instrument shall have a measurement accuracy of ±1mm.

8.1.2 The deviation rate (DeltaAc) between the nominal value (Ac1) of the outline lighting area in the sign and the measured value (Ac) of the outline lighting area is calculated according to formula (1).

8.2 Hot water storage tank

8.2.1 Take two 5cm × 5cm test samples from the inner tank of the water tank, using a lens with a resolution of not less than 0.01mm. The thickness of the sample center is measured using a micrometer, and the average of two measurements is taken as the thickness of the inner liner.

8.2.2 Fill the water tank with water at a temperature not exceeding 30°C until the system overflow outlet is reached, and open the system vent or the safety valve on top. Open the water tank and release water from the inlet to measure the water quality. The accuracy of the quality measurement should be ±1%, with an ambient temperature of 0°C to 39°C.

8.2.3 The deviation rate (DeltaV) between the nominal value (V1) and the measured value (V) of the hot water storage tank in the markings shall be calculated according to formula (2). Calculate the density of water here, taking rhow = 1000 kg/m^3.

8.2.4 The drain outlet and inlet/outlet of the hot water storage tank shall be visually inspected in accordance with the provisions of 7.2.3.

8.3 Safety Devices

8.3.1 Safety relief valve Check the documentation for your home solar water heating system and verify the following.

a) Each shut-off loop in the solar collector assembly must be equipped with at least one safety valve;

b) The specifications and performance of the safety valve conform to the provisions of 7.3.1;

c) The temperature of the heat transfer medium at the pressure release point of the safety valve will not exceed the maximum allowable temperature of the heat transfer medium.

8.3.2 Connecting pipes between safety valve and expansion tank Check the documentation for your home solar water heating system and verify the following.

a) Neither the safety valve nor the expansion tank connection pipes should be closed;

b) The diameter of the safety valve's connection pipe conforms to the specifications in 7.3.2;

c) The connection and piping of safety valves and expansion tanks should avoid the deposition of any dirt, scale or similar impurities.

8.3.3 Drain pipe Check the documents and piping diagrams of the household solar water heating system to confirm that the drain pipe complies with the provisions of 7.3.3.

8.4 Pressure Resistance

8.4.1 Test Apparatus and Methods The experimental setup is shown in Figure

3.Fill the household solar water heating system with water, purge any remaining air from the system using the vent valve, and then close the valve. The vent valve allows for slow pressurization to the test pressure via a hydraulic system. The test pressure for systems using open-outlet and open-type hot water storage tanks is the rated pressure. The working pressure is

1.25 times the operating pressure. For systems using a closed hot water storage tank, the test pressure is

1.5 times the rated working pressure. Heat exchange occurs within the hot water storage tank. The pressure test is applicable to heat exchangers whose heat transfer medium is water or antifreeze. Before the pressure test, both the hot water tank and the heat exchanger should be full of water. The heat exchanger is tested at

1.5 times its rated operating pressure. The test pressure is maintained for 10 minutes, while simultaneously checking the domestic solar water heating system for any issues. No expansion, deformation, leakage or cracking.

8.4.2 Test Conditions Ambient temperature. 0°C~39°C.

8.4.3 Test Results The household solar water heating system should be inspected for leaks, including the storage tank, heat exchanger, collector, auxiliary heat source, and piping. Check for expansion, deformation, and rupture; check for longitudinal displacement, deformation, and rupture in the collector tubes. Test results should specify the test pressure, ambient temperature, and other parameters. The duration of the experiment.

8.5 Thermal properties

8.5.1 The water temperature (te) at the end of heat collection in the hot water storage tank and the daily useful heat gain (q) of the water in the hot water storage tank per unit outline lighting area.

8.5.1.1 Test methods. Outdoor tests shall be conducted according to the methods specified in GB/T 18708, and indoor tests shall be conducted according to the methods specified in NB/T 10785. conduct.