GB/T 21087-2020 PDF English (GB/T 21087-2007: Older version)
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Energy recovery ventilators for outdoor air handling
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GB/T 21087-2020: PDF in English (GBT 21087-2020) GB/T 21087-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.30
P 46
Replacing GB/T 21087-2007
Energy recovery ventilators for outdoor air handling
ISSUED ON. SEPTEMBER 29, 2020
IMPLEMENTED ON. AUGUST 01, 2021
Issued by. State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 7
4 Classification and marking... 11
5 Structure and materials... 13
6 Requirements... 14
7 Test method... 17
8 Inspection rules... 23
9 Marking, packaging, transportation, storage... 25
Appendix A (Normative) Test methods for air volume, static pressure loss, available
pressure, input power... 28
Appendix B (Normative) Field test method of heat recovery performance... 37
Appendix C (Normative) Test method of internal exhaust air leakage ratio... 38
Appendix D (Normative) Test method of external air leakage ratio... 41
Appendix E (Normative) Test method for net outdoor air volume and net outdoor
airflow ratio in supply air... 44
Appendix F (Normative) Test methods for exchange effectiveness, energy efficiency
coefficient, energy recovery ratio... 51
Appendix G (Normative) Performance test method of reciprocating heat recovery unit
... 57
Appendix H (Normative) Test method of condensation and condensed water... 64
Appendix I (Normative) Noise test method... 65
Appendix J (Normative) Alternating performance test method... 70
Energy recovery ventilators for outdoor air handling
1 Scope
This standard specifies the classification and marking, structure and materials,
requirements, test methods, inspection rules, marking, packaging, transportation and
storage of energy recovery ventilators for outdoor air handling.
This standard applies to fresh exhaust ventilation units, that recover exhaust energy in
heating, ventilation, air conditioning and purification systems and pre-treat outdoor air
with cooling, heating, humidity, filtration.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 755-2019 Rotating electrical machines - Rating and performance
GB/T 1236-2017 Industrial fan - Performance testing using standardized airways
GB/T 2423.3 Environmental testing - Part 2.Testing method - Test Cab. Damp heat,
steady state
GB/T 3785.1-2010 Electroacoustics - Sound level meters - Part 1.Specifications
GB 4706.1-2005 Household and similar electrical appliances - Safety - Part 1.
General requirements
GB 8624 Classification for burning behavior of building materials and products
GB/T 9068 Determination of sound power levels for noise emitted by heating,
ventilating and air conditioning equipments - Engineering method
GB/T 14295 Air filter
GB/T 14296 Air cooling and air heating coils
GB/T 16803 Equipment of heating, ventilating, air conditioning and air cleaning
terminology
ERC-300×250×200×2-QR-JZ
5 Structure and materials
5.1 ERV and ERC shall be manufactured according to drawings and technical
documents.
5.2 The interior of ERV and ERC shall be clean and free of debris.
5.3 The surface of the plastic parts of ERV and ERC shall be flat and uniform in color,
without cracks, bubbles, etc.; the plastic parts shall be resistant to aging.
5.4 The sheet metal parts, spare parts, etc. of ERV and ERC shall have anti-rust
measures.
5.5 The metal shell of the outdoor part of ERV and ERC shall be treated with anti-rust;
the non-metallic materials shall have anti-aging properties.
5.6 ERC thermal insulation materials shall be non-toxic and odorless; the pasting shall
be flat and firm.
5.7 The fireproof characteristics of flame-retardant ERC shall meet the relevant
requirements of GB 50016; it shall be graded according to the relevant requirements of
GB 8624.
5.8 The line connection of ERV and ERC shall be neat and firm; it shall have reliable
grounding. The wire penetration and plug shall use insulating sleeves or other protective
measures; the exposed wires outside the shell should be protected by metal hoses.
5.9 Electrical control components shall be sensitive and reliable.
5.10 For ERV or ERC with inspection doors, the inspection doors shall be tight and
flexible; the inspection passage doors accessible to personnel shall be open both inside
and outside.
5.11 ERV shall ensure that condensate can be removed smoothly during heat exchange.
5.12 The surface air cooler and heater configured for ERV shall meet the relevant
requirements of GB/T 14296.
5.13 The air filter configured for ERV shall meet the relevant requirements of GB/T
14295.An air filter with a filtration efficiency not less than C1 shall be arranged on the
windward side of the heat exchange component (heat exchange core) on the exhaust
side; an air filter with a filtration efficiency not less than Z1 shall be arranged on the
windward side on the outdoor air side. The filter shall be easy to replace or clean.
5.14 Antibacterial ERC shall meet the relevant requirements of GB 21551.2.
5.15 ERV should be equipped with energy-saving operation controller. Under the
condition of meeting the requirements of outdoor air exhaust air distribution volume,
the ERV energy consumption can be reduced, by adjusting the fan speed, bypassing the
outdoor air exhaust, etc. according to the indoor and outdoor air conditions, motor
power consumption, etc.
5.16 Independently installed ERV outdoor air inlet and exhaust outlet shall be equipped
with insulated and sealed air valves.
6 Requirements
6.1 Appearance
The outer surface of the unit shall be smooth and the color shall be consistent, without
obvious scratches, rust spots, indentations, flow marks, bubbles, peeling. Various logos
and nameplates affixed to the outer surface shall be firm; the position shall be obvious.
6.2 Startup and operation
The components of ERV and ERC shall not be loose, noisy, overheated or have other
abnormal phenomena.
6.3 Air volume
The measured values of supply and exhaust air volume shall not be less than 95% of
the rated value.
6.4 Available pressure
The measured value of the available pressure on the outdoor air side and exhaust side
of the ERV shall not be less than 95% of the rated value.
6.5 Static pressure loss
The measured value of the static pressure loss on the outdoor air side and exhaust side
of the ERC shall not be greater than 105% of the rated value.
6.6 Input power
For units with a rated input power not exceeding 30 W, the measured value of the input
power shall not be greater than 120% of the rated value; for units with a rated input
power exceeding 30 W, the measured value of the input power shall not be greater than
110% of the rated value.
6.7 Internal exhaust air leakage ratio
For ERV and ERC with an air supply volume greater than 3000 m3/h, the measured
6.15 Noise
The measured noise value of ERV and rotary ERC shall not be greater than "rated value
+ 1 dB (A)".
6.16 Electrical strength
The electrical strength of ERV and rotary ERC shall not have breakdown or flashover.
6.17 Insulation resistance
The insulation resistance value of ERV and rotary ERC to ground in cold and hot states
shall not be less than 2 MΩ.
6.18 Water-sprayed insulation resistance
The water-sprayed insulation resistance of ERV and rotary ERC shall not be less than
1 MΩ.
6.19 Motor winding temperature rise
The motor winding temperature rise of ERV and rotary ERC shall comply with the
provisions of Table 8 in GB/T 755-2019.
6.20 Leakage current
6.20.1 The leakage current of ERV and rotary ERC, which has an air supply volume not
exceeding 3000 m3/h, shall comply with the provisions of 13.2 in GB 4706.1-2005.
6.20.2 The leakage current value between the exposed metal parts and the power cord
of ERV and rotary ERC, which has air supply volume exceeding 3000 m3/h, shall not
exceed 5 mA.
6.21 Grounding resistance
The resistance value between the exposed metal parts of ERV and rotary ERC and the
grounding terminal shall not exceed 0.1 Ω.
6.22 Damp heat characteristics
The insulation resistance between the live parts and the non-live metal parts of ERV
and rotary ERC shall not be less than 2 MΩ, meanwhile there shall be no breakdown or
flashover.
6.23 Outdoor air PM2.5 filtration efficiency
The measured value of the outdoor air PM2.5 filtration efficiency of ERV shall not be
less than 95% of the rated value.
specified in Table 3.
7.6.2 Measure the static pressure loss on the outdoor air side and exhaust side of the
ERC installed on site, according to the test method specified in Appendix B.
7.7 Input power
7.7.1 Measure the input power corresponding to the ERV and ERC (when applicable)
according to the test method specified in Appendix A and the test conditions specified
in Table 3.
7.7.2 Measure the input power corresponding to the ERV and ERC (when applicable)
installed on site, according to the test method specified in Appendix B.
7.8 Internal exhaust air leakage ratio
Measure the internal exhaust air leakage ratio, according to the test method specified in
Appendix C and the test conditions specified in Table 3.
7.9 External air leakage ratio
Measure the external air leakage ratio, according to the test method specified in
Appendix D and the test conditions specified in Table 3.
7.10 Net outdoor airflow rate in supply air
Measure the net outdoor airflow rate in supply air of ERV and ERC, according to the
test method specified in Appendix E and the test conditions specified in Table 3.
7.11 Net outdoor airflow ratio in supply air
Measure the net outdoor airflow ratio in supply air of ERV and ERC, according to the
test method specified in Appendix E and the test conditions specified in Table 3.
7.12 Exchange effectiveness
7.12.1 Measure the internal exhaust air leakage ratio of ERV or ERC, according to the
test method specified in Appendix C; or measure the net outdoor airflow ratio in supply
air of ERV or ERC, according to the test method specified in Appendix E. The exchange
effectiveness test can be carried out only after meeting the requirements of 6.7 or 6.10.
7.12.2 According to the test method specified in Appendix F and the test conditions
specified in Table 3, measure the sensible heat exchange effectiveness, absolute
humidity ratio exchange effectiveness, total heat exchange effectiveness of ERV or
ERC.
7.12.3 According to the test method specified in Appendix G and the test conditions
specified in Table 3, measure the sensible heat exchange effectiveness, absolute
humidity ratio exchange effectiveness, total heat exchange effectiveness of
reciprocating ERV.
7.13 Energy efficiency coefficient
Measure the energy efficiency coefficient of ERV according to the test method specified
in Appendix F and the test conditions specified in Table 3.
7.14 Energy recovery ratio
Measure the energy recovery ratio of ERC according to the test method specified in
Appendix F and the test conditions specified in Table 3.
7.15 Condensation and condensed water
7.15.1 According to the test method specified in Appendix H and the test conditions
specified in Table 3, run continuously for 4 hours at rated air volume and check the
condensation and condensed water results.
7.15.2 For devices with air volume adjustment, run continuously for 4 hours at
maximum air volume according to the test method specified in Appendix H and the test
conditions specified in Table 3; check the condensation and condensate results.
7.16 Noise
Measure the A-weighted sound pressure level noise of ERV according to the test method
specified in Appendix I.
7.17 Electrical strength
7.17.1 Run continuously for 4 hours according to the condensation and condensate
cooling capacity recovery test conditions specified in Table 3; apply a 1250 V, 50 Hz
sine wave voltage between the live part and the non-live metal part of the ERV or ERC.
The voltage applied at the beginning shall not be greater than half of the specified value;
then quickly increase to the full value for 60 s.
7.17.2 In mass production, it can be replaced by 1800 V voltage and 1 s duration at
room temperature.
7.18 Insulation resistance
7.18.1 Under normal temperature and humidity conditions, use a 500 V insulation
resistance meter to measure the insulation resistance (cold state) between the live parts
and non-live metal parts of ERV or ERC.
7.18.2 According to the condensation and condensate cooling recovery test conditions
specified in Table 3, run continuously for 4 hours; use a 500 V insulation resistance
meter to measure the insulation resistance (hot state) between the live parts and non-
8.3.2 Sampling inspection shall be carried out according to the items specified in Table
6.
8.4 Type inspection
8.4.1 Type inspection shall be carried out in any of the following situations.
a) When a new product is type finalized and identified;
b) When changes in the structure, manufacturing process, materials, etc. of the
finalized product affect the product performance;
c) When the production is transferred to another factory;
d) When the production is resumed after being stopped for more than one year.
8.4.2 Type inspection shall be carried out according to the items specified in Table 6.
8.5 Judgment rules
8.5.1 For exit-factory inspection, sampling inspection, type inspection, as long as one
unit fails one of the items specified in Table 6, the batch of products shall be judged as
unqualified.
8.5.2 For type inspection, if one of the electrical safety items 16, 17, 18, 19, 20, 21, 22
specified in Table 6 fails, the products of the production cycle shall be judged as
unqualified.
9 Marking, packaging, transportation, storage
9.1 Marking
9.1.1 Each ERV and ERC shall have a nameplate and shall be fixed in a conspicuous
position.
9.1.2 The following contents shall be clearly marked on the nameplate.
a) Name and model;
b) Main technical parameters.
- Air supply volume, exhaust volume, voltage, frequency, input power, exchange
effectiveness,
- Noise, available pressure and energy efficiency coefficient (applicable to ERV),
- Heat exchange core size, static pressure loss, energy recovery ratio (applicable
to ERC),
- Installation angle (applicable to heat pipe device),
- Rotation speed (applicable to rotary ERC), etc.;
c) Filter grade and filtration efficiency on the outdoor air side and exhaust side
(applicable to ERV with filtering function);
d) Standard number based on;
e) Production number;
f) Production date;
g) Manufacturer name.
9.1.3 For products manufactured in accordance with the standard, the performance
values marked on the nameplate shall be the values declared by the manufacturer under
standard air conditions and standard test conditions; the performance values under non-
standard working conditions may be marked in the sample or contract of the
manufacturer. When marked on the nameplate, the "nominal value" and the
corresponding environmental conditions shall be indicated.
9.1.4 The unit shall have a grounding mark and a safe operation requirement mark;
meanwhile it shall be accompanied by an electrical circuit diagram. The rotary ERC
shall have a mark for the rotation direction of the rotor.
9.2 Packaging
9.2.1 The product shall be cleaned and dried before packaging.
9.2.2 The packaging shall be moisture-proof, dust-proof, shock-proof.
9.2.3 The packaging box shall contain documents such as product certificate, packing
list, product description, etc.
9.2.4 The product certificate shall include the inspection conclusion, inspector's seal,
inspection date.
9.2.5 The packing list shall list all attachments.
9.3 Transportation and storage
9.3.1 During transportation, ERV and ERC shall be protected from collision, tipping,
crushing and rain and snow.
9.3.2 ERV and ERC shall be stored in a clean, dry, fireproof and well-ventilated place,
with no corrosive gas around.
9.4 Accompanying technical documents
The accompanying technical documents shall include at least the following.
a) Standard name adopted by the product;
b) Product name, model specification, aerodynamic performance curve, operating
temperature range, working principle, characteristics and use, etc.;
c) Main technical performance parameters.
- Supply air volume, exhaust air volume, net outdoor airflow rate in supply air,
- Heat exchange core size (applicable to ERC),
- Available pressure (applicable to ERV) or static pressure loss (applicable to
ERC),
- Voltage, frequency, input power,
- Noise,
- Sensible heat exchange effectiveness (applicable to sensible heat exchange ERV
and ERC),
- Total heat exchange effectiveness (applicable to total heat exchange ERV and
ERC),
- Installation angle (applicable to heat pipe ERC),
- Speed (applicable to rotary ERC),
- Overall dimensions and weight;
d) Installation structure dimension drawing and electrical circuit diagram;
e) Installation instructions and usage requirements;
f) Maintenance and precautions.
Appendix B
(Normative)
Field test method of heat recovery performance
B.1 Test device and instrument
B.1.1 The test device for field testing of air volume and air pressure shall meet the
requirements of Class B test device in Appendix A.
B.1.2 The test instrument used for field testing shall meet the requirements of Table 5.
B.1.3 The temperature and humidity test shall use an automatic acquisition system; the
instrument accuracy shall meet the requirements of Table 5.
B.2 Test conditions
B.2.1 The connecting pipes between the ERV and ERC under test and the flow and
pressure measurement sections shall not leak.
B.2.2 The air volume shall be controlled within ±5% of the rated air volume during the
test.
B.2.3 The air volume shall be adjusted by the system inverter or air valve during the
test; the device for adjusting the air volume shall not interfere with the air flow in the
measuring section.
B.3 Test steps
B.3.1 Measure the air volume, air pressure, power of the ERV and ERC according to
the test method specified in Appendix A. Each parameter shall be measured at least 3
times; the average value shall be taken.
B.3.2 After completing the air volume, air pressure, power tests, the heat recovery
performance test shall be carried out. The temperature and humidity test rate at each
position shall not be less than 1 time/min; the test time shall not be less than 30 minutes;
at least 30 measurements shall be completed.
B.4 Test results
The test results shall be calculated according to the data processing method specified in
Appendix F.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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