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GB/T 40517-2021 English PDF (GBT40517-2021)

GB/T 40517-2021 English PDF (GBT40517-2021)

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GB/T 40517-2021: Solar thermal storage system for low and medium temperature application

This document specifies the terms and definitions, classification and marking, general requirements, technical requirements, test methods, inspection rules, signs, instructions and product qualification certificates, packaging, transportation, storage of solar thermal storage system for low and medium temperature application. This document is applicable to thermal storage systems, that are mainly heated by solar radiation AND whose working temperature is less than or equal to 150 ??C.
GB/T 40517-2021
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.160
CCS F 12
Solar thermal storage system for low and medium
temperature application
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ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions... 6
4 Classification and marking ... 8
4.1 Classification ... 8
4.2 Marking ... 9
5 General ... 10
5.1 Service life ... 10
5.2 Structural requirements ... 10
5.3 Material and medium requirements ... 10
5.4 Water quality requirements ... 11
5.5 Electrical safety ... 11
6 Technical requirements ... 11
6.1 General provisions ... 11
6.2 Appearance ... 12
6.3 Thermal storage performance ... 12
6.4 Freezing resistance ... 13
6.5 Vacuum shock resistance ... 13
6.6 Pulse pressure ... 13
6.7 Pressure resistance ... 13
6.8 Safety performances ... 13
6.9 Pressure loss ... 14
7 Test methods ... 14
7.1 General provisions ... 14
7.2 Appearance ... 15
7.3 Thermal storage performance ... 15
7.4 Freezing resistance ... 23
7.5 Vacuum shock resistance ... 23
7.6 Pulse pressure ... 23
7.7 Pressure resistance ... 23
7.8 Safety devices ... 23
7.9 Pressure loss ... 23
8 Inspection rules ... 24
8.1 Types of inspections ... 24
8.2 Exit-factory inspection ... 24
8.3 Type inspection ... 24
8.4 Judgment rules ... 24
9 Markings, instructions, product certificates ... 25
9.1 Markings ... 25
9.2 Instructions ... 26
9.3 Product certificate ... 26
10 Packaging, transport, storage ... 26
10.1 Packaging ... 26
10.2 Transport ... 27
10.3 Storage ... 27
Solar thermal storage system for low and medium
temperature application
1 Scope
This document specifies the terms and definitions, classification and marking, general requirements, technical requirements, test methods, inspection rules, signs, instructions and product qualification certificates, packaging, transportation, storage of solar thermal storage system for low and medium temperature application.
This document is applicable to thermal storage systems, that are mainly heated by solar radiation AND whose working temperature is less than or equal to 150 ??C. 2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date applies to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 1720 Circle-drawing test of coating films
GB/T 1771 Paints and varnishes - Determination of resistance to neutral salt spray (fog)
GB/T 1865 Paints and varnishes - Artificial weathering and exposure to artificial radiation - Exposure to filtered xenon-arc radiation
GB 2894 Safety signs and guideline for the use
GB 4706.1 Household and similar electrical appliances - Safety - Part 1: General requirements
GB 5749 Standards for drinking water quality
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB/T 13384 General specifications for packing of mechanical and electrical product
GB/T 18713 Solar water heating systems - Design, installation and engineering acceptance
GB/T 19141 Specification of domestic solar water heating systems
GB/T 20095 Assessment code for performance of solar water heating systems GB/T 28745 Test methods for storage tank of domestic solar water heating system GB/T 28746 Specification of storage tank of domestic solar water heating system ISO 9488 Solar energy - Vocabulary
3 Terms and definitions
The terms and definitions, which are defined in GB/T 19141, GB/T 28746, ISO 9488, as well as the following terms and definitions, apply to this document. 3.1
Solar thermal storage system of low and medium temperature application
A thermal storage system, which stores the heat absorbed by the solar collector, in the form of sensible heat and/or latent heat AND has a working temperature of less than or equal to 150 ??C.
3.2
Thermal storage medium
A medium, that stores heat in the form of sensible and/or latent heat, by utilizing the thermal storage properties of matter.
3.3
State at completion of thermal storage
The state of the thermal storage system -- when the circulating working medium on the thermal storage side of the thermal storage system is at the rated flow rate; the inlet temperature reaches the nominal maximum thermal storage temperature of the product; the difference between the inlet temperature and the outlet temperature does not exceed 2 ??C.
3.4
State at completion of heat supply
The state of the thermal storage system -- when the circulating working medium on include thermal storage tanks and soil-buried-pipe thermal storage systems. It shall provide the thermal storage capacity, heat supply capacity, thermal storage efficiency, average heat supply power of the custom installed thermal storage systems, during the test period. It shall also provide the annual heat loss rate, for the thermal storage tank. 6.2 Appearance
6.2.1 The surface of the shell of the thermal storage system shall be flat, without cracks or obvious scratches.
6.2.2 The inlet and outlet of the thermal storage system shall have clear signs, which indicate the interface function and flow direction.
6.2.3 After 72 h of the salt spray resistance test, the shell coating of the thermal storage system shall be complete without cracks, falling skin, peeling off, rust. After the coating adhesion test, the shell coating shall not peel off AND reach the grade 1 specified in GB/T 1720; the specular reflectance of visible light on the surface of the shell material shall not be greater than 0.10. After the aging test, the shell material shall be free of fading or discoloration.
6.3 Thermal storage performance
6.3.1 Effective thermal storage capacity
The measured value of the effective thermal storage capacity shall not be lower than 95% of the nominal value.
6.3.2 Thermal storage efficiency
The measured value of thermal storage efficiency shall not be lower than 90% of the nominal value.
6.3.3 Average heat supply power
The measured value of the average heat supply power shall not be lower than 95% of the nominal value.
6.3.4 Stationary heat loss rate
The stationary heat loss rate shall not be greater than 6%.
6.3.5 Effective thermal storage capacity per unit mass
The measured value of the effective thermal storage capacity per unit mass of the phase change thermal storage system shall not be lower than 95% of the nominal value. 6.3.6 Decay rate of phase change thermal storage system
After the phase change thermal storage system has undergone continuous and repeated thermal storage-heat supply tests, AND after reaching the indicated number of tests, the decay rate of the phase change thermal storage system is calculated, according to the last measured value of heat supply capacity and the effective heat supply capacity. 6.3.7 Annual heat loss rate of thermal storage tank
It shall give the annual heat loss rate of the thermal storage tank.
6.4 Freezing resistance
After the freezing resistance test is carried out, under the conditions of -20 ??C ?? 2 ??C, the closed thermal storage system shall be free from leakage, breakage, deformation, destruction; the safety pressure relief device shall not freeze.
6.5 Vacuum shock resistance
Under the absolute vacuum pressure of 33 kPa, the closed thermal storage system shall not have any deformation, that affects the safety.
6.6 Pulse pressure
After the closed thermal storage system has undergone 80000 pulse pressure tests, the welds shall be free of leakage, obvious deformation, cracking.
6.7 Pressure resistance
The thermal storage system, heat exchanger, connecting pipeline shall meet the requirements for rated working pressure; there shall be no penetration, deformation or crack phenomenon, under the test pressure. If there is no express description, the closed working pressure shall not be less than 0.6 MPa, the test pressure shall be 1.5 times the rated working pressure; the open test pressure shall be 0.065 MPa.
6.8 Safety performances
6.8.1 The closed thermal storage system, heat exchanger, connecting pipeline shall be equipped with safety pressure relief protection device.
6.8.2 The leakage current, electric strength, grounding resistance of the thermal storage system of the live part, at the working temperature, shall meet the requirements of GB/T Description of index number:
1 - Solar thermal storage system of low and medium temperature application; 2 - Cooling equipment; 3 - Expansion tank; 4 - Filter; 5 - Circulating pump; 6 - Heating equipment; 7 - Flow control valve; 8 - The outlet pressure sensor of circulating working medium; 9 - The inlet pressure sensor of circulating working medium; 10 - The outlet temperature sensor of circulating working medium; 11 - The inlet temperature sensor of circulating working medium; 12 - Circulating medium flow sensor; 13 - Circulating medium outlet valve; 14 - Circulating medium inlet valve; 15 - Front valve of cooling equipment; 16 - Bypass valve of cooling equipment; 17 - Front valve of heating equipment; 18 - Bypass valve of heating equipment. Figure 1 -- Schematic diagram of the test system for thermal storage
performance
7.3.2 Test conditions
7.3.2.1 Fill enough thermal storage medium and circulating working medium, to the rated working pressure.
7.3.2.2 The temperature of the test environment shall be 20 ??C ?? 5 ??C; the relative humidity shall not be higher than 75%. The ambient temperature sensor shall be placed in the louver box; the installation position shall not be 1 m farther than the device under test; the height shall be 1/2 of the height of the device under test.
7.3.2.3 Set the control system of the thermal storage system, according to the parameters recommended by the manufacturer.
7.3.3 Test method
7.3.3.1 Pre-operation test
Before the thermal storage-heat supply test, a pre-operation test shall be carried out, according to the following method.
a) Connect the test system to the inlet and outlet of the thermal storage side of the thermal storage system. Open the valve of the thermal storage pipeline. Close the valve of the heat supply pipeline.
b) Start the circulating water pump. Adjust the flow rate of the circulating working medium, on the thermal storage side, to the rated working condition. Control the inlet temperature to increase, from the nominal minimum temperature. After every increase of 10 ??C, keep the temperature difference between the inlet and outlet stable and not greater than 2 ??C, for at least 5 minutes. Continue to heat up, until the inlet temperature reaches the nominal maximum temperature. The control accuracy of the inlet temperature shall be ??0.2 ??C; the thermal storage system stores heat in steps.
c) When the inlet temperature of the circulating working medium, on the thermal storage side, reaches the maximum temperature AND the thermal storage system reaches the state of completion of thermal storage, close the valve of the circulating pipeline on the thermal storage side; stabilize the thermal storage system for at least 20 minutes.
d) Connect the test system to the inlet and outlet of the heat supply side of the thermal storage system. Open the valve of the heat supply pipeline. Close the valve of the thermal storage pipeline.
e) Start the circulating water pump. Adjust the heating flow to reach the rated working condition. Control the inlet temperature to the nominal minimum temperature. Where there is no nominal minimum temperature, control the inlet temperature to 30 ??C; the control accuracy of the inlet temperature shall meet ??0.2 ??C. Make the thermal storage system continuously supply heat to the outside. f) When the inlet temperature of the circulating working medium, on the heating side, is kept at the minimum temperature AND the thermal storage system reaches the state of completion of heat supply, close the valve on the heating side; stabilize the thermal storage system for at least 20 minutes.
g) Perform the process of a) ~ f) again; at least 2 pre-operation tests shall be completed.
7.3.3.2 Thermal storage test
After the completion of the pre-operation test, the thermal storage test shall be carried out, according to the thermal storage process, which is described in 7.3.3.1. During the test, the circulating working medium flow on the thermal storage side, the inlet and outlet temperatures, the collection and recording time interval, the thermal storage time shall be recorded. Use the formula (1), to calculate the single thermal storage capacity Qs:
Where:
Qs - The single thermal storage, in kilowatt-hour (kWh);
??s - The density of the circulating working medium, on the thermal storage side, in kilograms per cubic meter (kg/m3);
cs - The specific heat capacity of the circulating working medium, on the thermal storage side, in kilojoules per kilogram Celsius [kJ/(kg ?€? ??C)];
Vs - The volume flow of circulating working medium, on the thermal storage side, test, in seconds (s);
i - the ith record of the heating test;
Ta - The total recording number of heating test.
7.3.3.4 Stationary heat loss rate test
After completing at least 2 consecutive thermal storage-heat supply tests, according to the methods of 7.3.3.2 and 7.3.3.3, conduct a thermal storage test, according to the method of 7.3.3.2. Then let the thermal storage system stand for 8 hours, according to the method of 7.3.3.3. Carry out a heating test again. In this time, the measured value of single heat supply is recorded as Qa,l.
7.3.3.5 Decay rate test of phase change thermal storage system
After completing at least two consecutive thermal storage-heat supply tests, in accordance with the methods in 7.3.3.2 and 7.3.3.3, continue to complete the stated number of continuous thermal storage-heat supply tests, according to the number of decay tests of the phase change thermal storage system, which is indicated by the manufacturer. The measured value of the last heat supply is recorded as Qa,x. 7.3.3.6 Thermal storage performance test of custom installed thermal storage system
For the thermal storage tank and the soil-buried-pipe thermal storage system, it may refer to formulas (1) and (2), respectively, to calculate the daily/monthly/yearly thermal storage capacity and heat supply capacity, by measuring the flow rate of the circulation system on the thermal storage side and the heat supply side, as well as the inlet and outlet temperatures.
The variation of the heat of the thermal storage tank and the soil-buried-pipe thermal storage system is calculated according to the formula (3):
Where:
??Qth - The heat change in the end state of the test, as compared to the start state, in kilowatt-hours (kWh);
Mth - The mass of water, in kilograms (kg);
cth - The specific heat capacity of water, in kilojoules per kilogram Celsius [kJ/(kg ?€? ??C)];
tth,1 - The average water temperature, at the beginning of the test, in degrees Celsius (??C);
8 Inspection rules
8.1 Types of inspections
The inspection of factory made thermal storage systems is divided into exit-factory inspection and type inspection.
8.2 Exit-factory inspection
8.2.1 The thermal storage system shall be subject to exit-factory inspection, before leaving the factory.
8.2.2 The exit-factory inspection shall be carried out, item by item according to 6.2, 6.7, 6.8.
8.3 Type inspection
8.3.1 Under normal production conditions, type inspection shall be carried out at least once a year.
8.3.2 Type inspection shall be carried out, when the product has one of the following conditions:
a) When a new product is trial-produced and type-finalized;
b) When the product structure, material and process are changed, which affect the product performance;
c) When the old product is subject to trans-plant production, or the production is resumed after suspension for more than 2 years;
d) When the state market regulatory agency requests type inspection.
8.3.3 The type inspection shall be carried out, by randomly selecting products from a certain batch of products, that have passed the exit-factory inspection. If the type inspection fails, it shall double the sampling quantity, for re-inspection. 8.3.4 Type inspection shall be carried out, item by item according to 6.1 ~ 6.9. 8.4 Judgment rules
8.4.1 The product is qualified, if all the exit-factory inspection items are in compliance with the requirements. It is unqualified, if one item fails.
8.4.2 If one of the type inspection items is unqualified, in appearance, thermal storage performance, pressure resistance, safety performance, the product is unqualified; if two of the other items are unqualified, the product is unqualified.
9 Markings, instructions, product certificates
9.1 Markings
9.1.1 The factory made thermal storage system shall have a durable nameplate, which is fixed in an obvious position. At least the following shall be clearly marked, on the nameplate:
a) Manufacturer's name and trademark;
b) Product model and name;
c) Exit-factory date or serial number;
d) Physical parameters, such as the filling mass and type of the thermal storage medium, the phase change temperature range and the number of phase changes of the phase change thermal storage medium;
e) Type of circulating working medium on the thermal storage side, rated flow rate, working temperature range, pressure loss, etc.;
f) Type of circulating working medium on the heating side, rated flow rate, working temperature range, pressure loss, etc.;
g) Nominal effective thermal storage capacity, thermal storage efficiency, average heat supply power, effective thermal storage capacity per unit mass of the phase change thermal storage system;
h) Rated working voltage, current, power (if applicable);
i) Overall dimensions and total weight of a single piece.
9.1.2 The factory made thermal storage system's package shall have clear signs, that comply with the provisions of GB/T 191. It shall mainly include the signs of "Handle with care", "Avoid moisture", "No tumbling", "Limit number of stacking layers", "Keep upwards", etc.
9.1.3 The relevant parts of the factory made thermal storage system shall be provided with indication, control, operation signs, etc., to indicate the name, position or status (such as steering, flow direction, indicating instruments, various control buttons, etc.).

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