Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 21087-2007 Air-to-air energy recovery equipment. In addition to a number of editorial changes, the following technical changes have been made with respect to GB/T 21087-2007:
——The requirements for the performance related to the net outdoor airflow rate in supply air are added (see 6.9 and 7.10 hereof);
——The requirements for the minimum filter level on the outdoor air side and exhaust air side of the energy recovery ventilators for outdoor air handling are added (see 5.13 hereof);
——Some test conditions are modified (see 7.1.3 hereof; 6.1.2 of Edition 2007);
——The test methods and related requirements for coefficient of energy and ratio of energy recovery are added (see 6.12, 6.13, 7.13 and 7.14 hereof);
——The performance and test methods of reciprocating energy recovery ventilators are added (see 7.12.3 and Annex G hereof);
——The alternating performance and test methods are added (see 6.24, 7.25 and Annex J hereof).
This standard was proposed by the Ministry of Housing and Urban-Rural Development of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee on HVAC and Purification Equipment of Standardization Administration of China (SAC/TC 143).
The previous edition of the standard replaced by this standard is as follows:
——GB/T 21087-2007.
Energy recovery ventilators for outdoor air handling
1 Scope
This standard specifies the classification and identification, structure and materials, requirements, test methods, inspection rules, marking, packaging, transportation and storage of energy recovery ventilators for outdoor air handling.
This standard is applicable to energy recovery ventilators that recover exhaust energy in heating, ventilation, air conditioning and purification systems and pretreat outdoor air with cold, heat, humidity and filtration.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 755-2019 Rotating electrical machines—Rating and performance
GB/T 1236-2017 Industrial fans—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 equipment—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
GB 21551.2 Antibacterial and cleaning function for household and similar electrical appliances—Particular requirements of material
GB/T 34012 Air cleaner for ventilation system
GB 50016 Code for fire protection design of buildings
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 16803 and the following apply.
3.1
energy recovery ventilators for outdoor air handling; ERV
equipment which takes sensible heat or total heat energy recovery component as the core and drives air flow through fan to realize the recovery of exhaust energy by outdoor air and outdoor air filtration
3.2
energy recovery components; ERC
heat exchange component that realizes sensible heat or total heat energy exchange between air and air.
3.3
total heat exchange
energy exchange in which sensible and latent heat transforms simultaneously
3.4
sensible heat exchange
energy exchange in which only sensible heat transformation occurs
3.5
standard air
air with atmospheric pressure of 101.3 kPa, dry-bulb temperature of 20°C, wet-bulb temperature of 15.8°C and density of 1.2 kg/m3
3.6
outdoor air
outdoor air entering from the outdoor air inlet
3.7
supply air
air sent out from the air supply outlet
3.8
return air
indoor air entering from the air return outlet
3.9
exhaust air
air discharged from the air outlet
3.10
rated value
performance value that ERV or ERC shall reach under the test conditions specified in this standard
3.11
supply air flow rate
volume flow of air sent out from the air supply outlet
Note: The unit is m3/h.
3.12
exhaust air flow rate
volume flow of air discharged from the exhaust outlet
Note: The unit is m3/h.
3.13
power input
sum of power input of air supply and exhaust fans and auxiliary electrical equipment (ERV) or power input of auxiliary electrical equipment (ERC)
Note: The unit is W or kW.
3.14
available pressure of ERV
difference between the total pressure of the outlet air and the total pressure of the inlet air in the ERV air supply channel and exhaust channel under the corresponding air flow rate
Note: The unit is Pa.
3.15
air pressure drop of ERC
pressure drop generated by ERC in ERC air supply channel and exhaust channel under the corresponding air flow rate
Note: The unit is Pa.
3.16
sensible exchange effectiveness
ratio of temperature difference between outdoor air inlet and supply air outlet to temperature difference between outdoor air inlet and return air inlet under corresponding air flow rate
Note: It is expressed as a percentage.
3.17
total exchange effectiveness
ratio of enthalpy difference of outdoor air inlet and supply air outlet to enthalpy difference of outdoor air inlet and return air inlet under corresponding air flow rate
Note: It is expressed as a percentage.
3.18
absolute humidity ratio exchange effectiveness
ratio of moisture content difference between outdoor air inlet and supply air outlet to moisture content difference between outdoor air inlet and return air inlet under corresponding air flow rate
Note: It is expressed as a percentage.
3.19
ratio of energy recovery of ERC
ratio of energy recovered by ERC to the electric energy consumed during energy recovery
Note: It is expressed as a percentage.
3.20
coefficient of energy of ERV
ratio of the sum of the total energy exchanged between the outdoor and exhaust air flows and the energy possessed by the air flow to the power input of ERV.
Note: It is expressed as a percentage.
3.21
external air leakage ratio
ratio of the air flow rate leaking in and out from the gap of ERV or ERC shell to the average flow rate of rated air supply and exhaust
Note: It is expressed as a percentage.
3.22
internal exhaust air leakage ratio
ratio of the air flow rate leaked from the exhaust air side into the outdoor air side in the ERV or ERC to the rated air supply flow rate
Note: It is expressed as a percentage.
3.23
net outdoor airflow rate in supply air
volume flow of outdoor air contained in the supply air of ERV or ERC
Note: The unit is m3/h.
3.24
net outdoor airflow ratio in supply air
ratio of the volume flow of outdoor air contained in the supply air of ERV or ERC to the supply air flow rate
Note: It is expressed as a percentage.
3.25
energy-saving controller
energy saving operation control device with monitoring and control function equipped by ERV
4 Classification and identification
4.1 Classification
4.1.1 The code of energy recovery ventilators for outdoor air handling is "ERV", and the code of energy recovery components is "ERC".
4.1.2 See Table 1 for the classification and corresponding codes of ERV and ERC.
Table 1 Classification and corresponding codes of ERV and ERC
Name Classification mode Category Code
Energy recovery ventilators for outdoor air handling (ERV) By installation mode Floor type LD
Hoisting type DZ
Wall-mounted type BG
Window type CS
Embedded type QS
Energy recovery component (ERC) By type of energy recovery Total heat type QR
Sensible heat type XR
By operating state Rotary type (including rotary wheel type, channel wheel type, etc.) XZ
Static type (including plate-fin type, heat pipe type, liquid circulation type, etc.) JZ
Reciprocating WF
By the shape of air inlet and outlet sections Circular Diameter × thickness × channel height
Rectangle Length × width × thickness × channel height
By fire resistance Fire retardant type NR
Non-flame retardant type —
By antibacterial properties Antibacterial type KJ
Ordinary type —
4.2 Labels
4.2.1 ERV label
Example:
For the total heat, hoisting type, rotary type, non-flame retardant and ordinary antibacterial energy recovery ventilators for outdoor air handling with rated supply air flow rate of 300 m3/h, it is labeled as:
ERV-300-QR-DZ-XZ
4.2.2 ERC label
Example:
For sensible, rotary, flame retardant and ordinary antibacterial energy recovery components with rotary wheel diameter of 300 mm, thickness of 100 mm and channel height of 2 mm, it is labeled as:
ERC-ɸ300×100×2-XR-XZ-NR
For the total heat, static, non-flame retardant and ordinary antibacterial energy recovery components with air inlet and outlet section size of 300 mm long, 250 mm wide, 200 mm thick and channel height of 2 mm, it is labeled as:
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 sundries.
5.3 The surface of ERV and ERC plastic parts shall be flat, uniform in color, free from cracks, bubbles, etc. The plastic parts shall be resistant to aging.
5.4 Anti-rust measures shall be taken for sheet metal parts and spare parts of ERV and ERC.
5.5 The metal shell of ERV and ERC outdoor parts shall be treated with anti-rust treatment, and non-metallic materials shall be resistant to aging.
5.6 ERC’s thermal insulation material shall be non-toxic and odorless, and the paste shall be flat and firm.
5.7 The fire resistance characteristics of flame retardant ERC shall meet the relevant requirements of GB 50016 and shall be classified according to the relevant requirements of GB 8624.
5.8 The wiring connection between ERV and ERC shall be neat and firm, and shall be reliably earthed. Insulating sleeve or other protective measures shall be used for wire perforation and plug connection, and metal hose shall be used for protection of exposed wires outside the shell.
5.9 Electrical control components shall act sensitively and reliably.
5.10 For ERV or ERC with access doors, the access doors shall be tight and flexible, and the access doors accessible to personnel shall be opened both inside and outside.
5.11 ERV shall ensure the smooth removal of condensate during heat exchange.
5.12 The ERV shall be equipped with surface air cooler and heater that meet the requirements of GB/T 14296.
5.13 The ERV shall be equipped with air filter that meets the relevant requirements of GB/T 14295. Air filters with filtration efficiency not lower than C1 shall be arranged on the windward side of the exhaust air side of the heat exchange component (heat exchange core), and air filters with filtration efficiency not lower than Z1 shall be arranged on the windward side of the outdoor air side. The filters shall be easily replaced or cleaned.
5.14 Antibacterial ERC shall meet the relevant requirements of GB 21551.2.
5.15 ERV should be equipped with an energy-saving operation controller, which can reduce the energy consumption by adjusting fan speed and bypassing outdoor air and exhaust air under the condition of meeting the requirements of transmission and distribution air flow rate of outdoor air and exhaust air according to indoor and outdoor air conditions and motor power consumption.
5.16 The independently installed ERV outdoor air inlet and exhaust air outlet should be equipped with insulated airtight air valve.
6 Requirements
6.1 Appearance
The outer surface of the ventilator shall be smooth and the color tone shall be consistent, without obvious scratches, rust spots, indentations, flow marks, blisters and peeling. All kinds of marks and nameplates pasted on the outer surface shall be firm and in an obvious position.
6.2 Start-up and operation
The parts of ERV and ERC shall be free from looseness, noise and overheating.
6.3 Air flow rate
The measured value of supply air flow rate and exhaust air flow rate shall not be less than 95% of the rated value.
6.4 Available pressure
The measured available pressures on the outdoor air side and exhaust air side of ERV shall not be less than 95% of the rated value.
6.5 Static pressure drop
The measured static pressure drops on the outdoor air side and exhaust air side of ERC shall not be greater than 105% of the rated value.
6.6 Power input
For ventilators with rated power input not greater than 30 W, the measured value of power input shall not be greater than 120% of the rated value; for ventilators with rated power input greater than 30 W, the measured power input shall not be greater than 110% of the rated value.
6.7 Internal exhaust air leakage ratio
For ERV and ERC with supply air flow rate greater than 3,000 m3/h, the measured value of internal exhaust air leakage ratio shall not be greater than 10%, and shall not be greater than "rated value + 1%".
6.8 External air leakage ratio
For ERV and ERC with supply air flow rate greater than 3,000 m3/h, the measured value of external air leakage ratio shall not be greater than 3%.
6.9 Net outdoor airflow rate in supply air
The measured value of net outdoor airflow rate in supply air shall not be less than 95% of the rated value.
6.10 Net outdoor airflow ratio in supply air
For ERV and ERC with supply air flow rate not greater than 3,000 m3/h, the measured value of net outdoor airflow ratio in supply air shall not be less than 90%, and shall not be less than "rated value – 1%".
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and identification
5 Structure and materials
6 Requirements
7 Test methods
8 Inspection rules
9 Marking, packaging, transportation and storage
Annex A (Normative) Test method for air flow rate, static pressure drop, available pressure and power input
Annex B (Normative) Field test method for energy recovery performance
Annex C (Normative) Test method for internal exhaust air leakage ratio
Annex D (Normative) Test method for external air leakage ratio
Annex E (Normative) Test method for net outdoor airflow rate in supply air and net outdoor airflow ratio in supply air
Annex F (Normative) Test method for exchange effectiveness, coefficient of energy and ratio of energy recovery
Annex G (Normative) Test method for performance of reciprocating energy recovery ventilators
Annex H (Normative) Test method for condensation and condensed water
Annex I (Normative) Test method for noise
Annex J (Normative) Test method for alternating performance
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 21087-2007 Air-to-air energy recovery equipment. In addition to a number of editorial changes, the following technical changes have been made with respect to GB/T 21087-2007:
——The requirements for the performance related to the net outdoor airflow rate in supply air are added (see 6.9 and 7.10 hereof);
——The requirements for the minimum filter level on the outdoor air side and exhaust air side of the energy recovery ventilators for outdoor air handling are added (see 5.13 hereof);
——Some test conditions are modified (see 7.1.3 hereof; 6.1.2 of Edition 2007);
——The test methods and related requirements for coefficient of energy and ratio of energy recovery are added (see 6.12, 6.13, 7.13 and 7.14 hereof);
——The performance and test methods of reciprocating energy recovery ventilators are added (see 7.12.3 and Annex G hereof);
——The alternating performance and test methods are added (see 6.24, 7.25 and Annex J hereof).
This standard was proposed by the Ministry of Housing and Urban-Rural Development of the People's Republic of China.
This standard is under the jurisdiction of the National Technical Committee on HVAC and Purification Equipment of Standardization Administration of China (SAC/TC 143).
The previous edition of the standard replaced by this standard is as follows:
——GB/T 21087-2007.
Energy recovery ventilators for outdoor air handling
1 Scope
This standard specifies the classification and identification, structure and materials, requirements, test methods, inspection rules, marking, packaging, transportation and storage of energy recovery ventilators for outdoor air handling.
This standard is applicable to energy recovery ventilators that recover exhaust energy in heating, ventilation, air conditioning and purification systems and pretreat outdoor air with cold, heat, humidity and filtration.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 755-2019 Rotating electrical machines—Rating and performance
GB/T 1236-2017 Industrial fans—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 equipment—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
GB 21551.2 Antibacterial and cleaning function for household and similar electrical appliances—Particular requirements of material
GB/T 34012 Air cleaner for ventilation system
GB 50016 Code for fire protection design of buildings
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 16803 and the following apply.
3.1
energy recovery ventilators for outdoor air handling; ERV
equipment which takes sensible heat or total heat energy recovery component as the core and drives air flow through fan to realize the recovery of exhaust energy by outdoor air and outdoor air filtration
3.2
energy recovery components; ERC
heat exchange component that realizes sensible heat or total heat energy exchange between air and air.
3.3
total heat exchange
energy exchange in which sensible and latent heat transforms simultaneously
3.4
sensible heat exchange
energy exchange in which only sensible heat transformation occurs
3.5
standard air
air with atmospheric pressure of 101.3 kPa, dry-bulb temperature of 20°C, wet-bulb temperature of 15.8°C and density of 1.2 kg/m3
3.6
outdoor air
outdoor air entering from the outdoor air inlet
3.7
supply air
air sent out from the air supply outlet
3.8
return air
indoor air entering from the air return outlet
3.9
exhaust air
air discharged from the air outlet
3.10
rated value
performance value that ERV or ERC shall reach under the test conditions specified in this standard
3.11
supply air flow rate
volume flow of air sent out from the air supply outlet
Note: The unit is m3/h.
3.12
exhaust air flow rate
volume flow of air discharged from the exhaust outlet
Note: The unit is m3/h.
3.13
power input
sum of power input of air supply and exhaust fans and auxiliary electrical equipment (ERV) or power input of auxiliary electrical equipment (ERC)
Note: The unit is W or kW.
3.14
available pressure of ERV
difference between the total pressure of the outlet air and the total pressure of the inlet air in the ERV air supply channel and exhaust channel under the corresponding air flow rate
Note: The unit is Pa.
3.15
air pressure drop of ERC
pressure drop generated by ERC in ERC air supply channel and exhaust channel under the corresponding air flow rate
Note: The unit is Pa.
3.16
sensible exchange effectiveness
ratio of temperature difference between outdoor air inlet and supply air outlet to temperature difference between outdoor air inlet and return air inlet under corresponding air flow rate
Note: It is expressed as a percentage.
3.17
total exchange effectiveness
ratio of enthalpy difference of outdoor air inlet and supply air outlet to enthalpy difference of outdoor air inlet and return air inlet under corresponding air flow rate
Note: It is expressed as a percentage.
3.18
absolute humidity ratio exchange effectiveness
ratio of moisture content difference between outdoor air inlet and supply air outlet to moisture content difference between outdoor air inlet and return air inlet under corresponding air flow rate
Note: It is expressed as a percentage.
3.19
ratio of energy recovery of ERC
ratio of energy recovered by ERC to the electric energy consumed during energy recovery
Note: It is expressed as a percentage.
3.20
coefficient of energy of ERV
ratio of the sum of the total energy exchanged between the outdoor and exhaust air flows and the energy possessed by the air flow to the power input of ERV.
Note: It is expressed as a percentage.
3.21
external air leakage ratio
ratio of the air flow rate leaking in and out from the gap of ERV or ERC shell to the average flow rate of rated air supply and exhaust
Note: It is expressed as a percentage.
3.22
internal exhaust air leakage ratio
ratio of the air flow rate leaked from the exhaust air side into the outdoor air side in the ERV or ERC to the rated air supply flow rate
Note: It is expressed as a percentage.
3.23
net outdoor airflow rate in supply air
volume flow of outdoor air contained in the supply air of ERV or ERC
Note: The unit is m3/h.
3.24
net outdoor airflow ratio in supply air
ratio of the volume flow of outdoor air contained in the supply air of ERV or ERC to the supply air flow rate
Note: It is expressed as a percentage.
3.25
energy-saving controller
energy saving operation control device with monitoring and control function equipped by ERV
4 Classification and identification
4.1 Classification
4.1.1 The code of energy recovery ventilators for outdoor air handling is "ERV", and the code of energy recovery components is "ERC".
4.1.2 See Table 1 for the classification and corresponding codes of ERV and ERC.
Table 1 Classification and corresponding codes of ERV and ERC
Name Classification mode Category Code
Energy recovery ventilators for outdoor air handling (ERV) By installation mode Floor type LD
Hoisting type DZ
Wall-mounted type BG
Window type CS
Embedded type QS
Energy recovery component (ERC) By type of energy recovery Total heat type QR
Sensible heat type XR
By operating state Rotary type (including rotary wheel type, channel wheel type, etc.) XZ
Static type (including plate-fin type, heat pipe type, liquid circulation type, etc.) JZ
Reciprocating WF
By the shape of air inlet and outlet sections Circular Diameter × thickness × channel height
Rectangle Length × width × thickness × channel height
By fire resistance Fire retardant type NR
Non-flame retardant type —
By antibacterial properties Antibacterial type KJ
Ordinary type —
4.2 Labels
4.2.1 ERV label
Example:
For the total heat, hoisting type, rotary type, non-flame retardant and ordinary antibacterial energy recovery ventilators for outdoor air handling with rated supply air flow rate of 300 m3/h, it is labeled as:
ERV-300-QR-DZ-XZ
4.2.2 ERC label
Example:
For sensible, rotary, flame retardant and ordinary antibacterial energy recovery components with rotary wheel diameter of 300 mm, thickness of 100 mm and channel height of 2 mm, it is labeled as:
ERC-ɸ300×100×2-XR-XZ-NR
For the total heat, static, non-flame retardant and ordinary antibacterial energy recovery components with air inlet and outlet section size of 300 mm long, 250 mm wide, 200 mm thick and channel height of 2 mm, it is labeled as:
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 sundries.
5.3 The surface of ERV and ERC plastic parts shall be flat, uniform in color, free from cracks, bubbles, etc. The plastic parts shall be resistant to aging.
5.4 Anti-rust measures shall be taken for sheet metal parts and spare parts of ERV and ERC.
5.5 The metal shell of ERV and ERC outdoor parts shall be treated with anti-rust treatment, and non-metallic materials shall be resistant to aging.
5.6 ERC’s thermal insulation material shall be non-toxic and odorless, and the paste shall be flat and firm.
5.7 The fire resistance characteristics of flame retardant ERC shall meet the relevant requirements of GB 50016 and shall be classified according to the relevant requirements of GB 8624.
5.8 The wiring connection between ERV and ERC shall be neat and firm, and shall be reliably earthed. Insulating sleeve or other protective measures shall be used for wire perforation and plug connection, and metal hose shall be used for protection of exposed wires outside the shell.
5.9 Electrical control components shall act sensitively and reliably.
5.10 For ERV or ERC with access doors, the access doors shall be tight and flexible, and the access doors accessible to personnel shall be opened both inside and outside.
5.11 ERV shall ensure the smooth removal of condensate during heat exchange.
5.12 The ERV shall be equipped with surface air cooler and heater that meet the requirements of GB/T 14296.
5.13 The ERV shall be equipped with air filter that meets the relevant requirements of GB/T 14295. Air filters with filtration efficiency not lower than C1 shall be arranged on the windward side of the exhaust air side of the heat exchange component (heat exchange core), and air filters with filtration efficiency not lower than Z1 shall be arranged on the windward side of the outdoor air side. The filters shall be easily replaced or cleaned.
5.14 Antibacterial ERC shall meet the relevant requirements of GB 21551.2.
5.15 ERV should be equipped with an energy-saving operation controller, which can reduce the energy consumption by adjusting fan speed and bypassing outdoor air and exhaust air under the condition of meeting the requirements of transmission and distribution air flow rate of outdoor air and exhaust air according to indoor and outdoor air conditions and motor power consumption.
5.16 The independently installed ERV outdoor air inlet and exhaust air outlet should be equipped with insulated airtight air valve.
6 Requirements
6.1 Appearance
The outer surface of the ventilator shall be smooth and the color tone shall be consistent, without obvious scratches, rust spots, indentations, flow marks, blisters and peeling. All kinds of marks and nameplates pasted on the outer surface shall be firm and in an obvious position.
6.2 Start-up and operation
The parts of ERV and ERC shall be free from looseness, noise and overheating.
6.3 Air flow rate
The measured value of supply air flow rate and exhaust air flow rate shall not be less than 95% of the rated value.
6.4 Available pressure
The measured available pressures on the outdoor air side and exhaust air side of ERV shall not be less than 95% of the rated value.
6.5 Static pressure drop
The measured static pressure drops on the outdoor air side and exhaust air side of ERC shall not be greater than 105% of the rated value.
6.6 Power input
For ventilators with rated power input not greater than 30 W, the measured value of power input shall not be greater than 120% of the rated value; for ventilators with rated power input greater than 30 W, the measured power input shall not be greater than 110% of the rated value.
6.7 Internal exhaust air leakage ratio
For ERV and ERC with supply air flow rate greater than 3,000 m3/h, the measured value of internal exhaust air leakage ratio shall not be greater than 10%, and shall not be greater than "rated value + 1%".
6.8 External air leakage ratio
For ERV and ERC with supply air flow rate greater than 3,000 m3/h, the measured value of external air leakage ratio shall not be greater than 3%.
6.9 Net outdoor airflow rate in supply air
The measured value of net outdoor airflow rate in supply air shall not be less than 95% of the rated value.
6.10 Net outdoor airflow ratio in supply air
For ERV and ERC with supply air flow rate not greater than 3,000 m3/h, the measured value of net outdoor airflow ratio in supply air shall not be less than 90%, and shall not be less than "rated value – 1%".
Contents of GB/T 21087-2020
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and identification
5 Structure and materials
6 Requirements
7 Test methods
8 Inspection rules
9 Marking, packaging, transportation and storage
Annex A (Normative) Test method for air flow rate, static pressure drop, available pressure and power input
Annex B (Normative) Field test method for energy recovery performance
Annex C (Normative) Test method for internal exhaust air leakage ratio
Annex D (Normative) Test method for external air leakage ratio
Annex E (Normative) Test method for net outdoor airflow rate in supply air and net outdoor airflow ratio in supply air
Annex F (Normative) Test method for exchange effectiveness, coefficient of energy and ratio of energy recovery
Annex G (Normative) Test method for performance of reciprocating energy recovery ventilators
Annex H (Normative) Test method for condensation and condensed water
Annex I (Normative) Test method for noise
Annex J (Normative) Test method for alternating performance
