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Reflective thermal insulation coating standards implementation procedures
by：Opal
2021-01-18
1 standard state
JG/T235 revised in 2014. Although new puts forward the concept of 'brightness', and an increase in the near infrared reflectance indexes, try to overcome the unreasonable provisions of the standard, but can determine coating cooling effectiveness index 'heat temperature difference' from regulation index as a reference index. At the same time, the original standard JG/T235 - The heat preservation temperature difference detection method in 2008 also exist obvious defect
JGJ/T287 - 2015 has been implemented, the solar reflectance and near infrared reflectance photometry is still the principal means of reflective insulation coating construction acceptance, this suggests that the standard still unaware of the standards by the competent department of defects, objectively promoted the heavy reflex and don't pay attention to the energy saving effect of product diffusion at random, and the real energy saving cooling effect of the coating is unable to get the support and guidance. To this end, the author in the scientific standard magazine [ 5] Published an article that function indexes and the specific test method to determine the standard of obvious defects, and is reflective thermal insulation coating and application market one of the main reason for the confusion.
2 standard improper use
as the standard name has been defined as 'reflection heat insulation coating', or 'hot reflection heat insulation coatings', and clearly defined as 'the sun high reflectivity, high near-infrared reflectance and hemisphere of high emissivity coating', or 'heat insulation effect of coatings', in addition, the standard not quantitatively illustrate the heat insulation effect is obvious; Don't know is semifinished product room, ordinary white paint, ordinary paint, same color fastens with color standard or other reference quantitative comparison. Compared with the semifinished product, as long as the surface is smooth white coating, even whitewash or putty powder, its solar reflectance, near infrared reflectance, hemispherical emissivity will have a certain degree of increase, and may even meet the standard requirements. Relative to the semifinished product, there will be a cooling effect. From this perspective, the standard is correct. Three standards are not referred to the concept of 'energy saving' and 'cooling', so its name, definition, function index and test method are unified. It does not attempt to include all can 'cool', 'energy saving', or 'heat' of architectural coatings, but only refers to the reflection
the heat insulation coating. But standard users or departments mistakenly 'reflective insulation coating' as 'cool', 'energy saving' or 'heat insulation coating is the only standard, and as a promotion product market on the basis of energy saving coating product, specification, biased and inappropriate.
3 standards flawed
on the other hand, a strong emphasis on building energy saving in our country, in hot summer and warm winter area and vigorously promote the use of hot summer and cold winter area can reduce energy consumption of the architectural coatings, regardless of the energy saving mechanism of coating is reflected sunlight, reflected infrared radiation heat energy, improve the thermal resistance, or other, as long as it can reduce the outside wall or indoor temperature, reduce the energy consumption, the more the better the quality. But because of the limitations on product standards specified in the technical indicators and do not take the energy consumption index of the defects, as well as standard in the process of implementation of improper use, hindered the healthy development of industry and standard operation of the market. Main defects embodied in the following two points:
1) The three functional index threshold specified in the standard is not high. Although these indicators can be used to calculate the thermal design and acceptance of the equivalent thermal resistance, but these three indicators and energy saving efficiency correlation of the measured data is rarely seen. In table 1 all kinds of commonly used coating of three indicators are qualified and even high, show that the index can't distinguish between commonly used coating and coating of energy-saving, more difficult to distinguish between good and bad.
2) Due to the limitations of standard and use undeserved, R&D institutions was misguided coating products, one-sided pursuit of the three in
JG/T235 revised in 2014. Although new puts forward the concept of 'brightness', and an increase in the near infrared reflectance indexes, try to overcome the unreasonable provisions of the standard, but can determine coating cooling effectiveness index 'heat temperature difference' from regulation index as a reference index. At the same time, the original standard JG/T235 - The heat preservation temperature difference detection method in 2008 also exist obvious defect
JGJ/T287 - 2015 has been implemented, the solar reflectance and near infrared reflectance photometry is still the principal means of reflective insulation coating construction acceptance, this suggests that the standard still unaware of the standards by the competent department of defects, objectively promoted the heavy reflex and don't pay attention to the energy saving effect of product diffusion at random, and the real energy saving cooling effect of the coating is unable to get the support and guidance. To this end, the author in the scientific standard magazine [ 5] Published an article that function indexes and the specific test method to determine the standard of obvious defects, and is reflective thermal insulation coating and application market one of the main reason for the confusion.
2 standard improper use
as the standard name has been defined as 'reflection heat insulation coating', or 'hot reflection heat insulation coatings', and clearly defined as 'the sun high reflectivity, high near-infrared reflectance and hemisphere of high emissivity coating', or 'heat insulation effect of coatings', in addition, the standard not quantitatively illustrate the heat insulation effect is obvious; Don't know is semifinished product room, ordinary white paint, ordinary paint, same color fastens with color standard or other reference quantitative comparison. Compared with the semifinished product, as long as the surface is smooth white coating, even whitewash or putty powder, its solar reflectance, near infrared reflectance, hemispherical emissivity will have a certain degree of increase, and may even meet the standard requirements. Relative to the semifinished product, there will be a cooling effect. From this perspective, the standard is correct. Three standards are not referred to the concept of 'energy saving' and 'cooling', so its name, definition, function index and test method are unified. It does not attempt to include all can 'cool', 'energy saving', or 'heat' of architectural coatings, but only refers to the reflection
the heat insulation coating. But standard users or departments mistakenly 'reflective insulation coating' as 'cool', 'energy saving' or 'heat insulation coating is the only standard, and as a promotion product market on the basis of energy saving coating product, specification, biased and inappropriate.
3 standards flawed
on the other hand, a strong emphasis on building energy saving in our country, in hot summer and warm winter area and vigorously promote the use of hot summer and cold winter area can reduce energy consumption of the architectural coatings, regardless of the energy saving mechanism of coating is reflected sunlight, reflected infrared radiation heat energy, improve the thermal resistance, or other, as long as it can reduce the outside wall or indoor temperature, reduce the energy consumption, the more the better the quality. But because of the limitations on product standards specified in the technical indicators and do not take the energy consumption index of the defects, as well as standard in the process of implementation of improper use, hindered the healthy development of industry and standard operation of the market. Main defects embodied in the following two points:
1) The three functional index threshold specified in the standard is not high. Although these indicators can be used to calculate the thermal design and acceptance of the equivalent thermal resistance, but these three indicators and energy saving efficiency correlation of the measured data is rarely seen. In table 1 all kinds of commonly used coating of three indicators are qualified and even high, show that the index can't distinguish between commonly used coating and coating of energy-saving, more difficult to distinguish between good and bad.
2) Due to the limitations of standard and use undeserved, R&D institutions was misguided coating products, one-sided pursuit of the three in
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