LY/T 3233-2020Guiding standard for formaldehyde release load capacity of wood floors for ground with heating system (English PDF)

4.1 Calculation of release rate

Where.

ER- the amount of formaldehyde released per unit area per unit time, in milligrams per square meter hour (mg/(m2﹒h)) the concentration of formaldehyde when the air formaldehyde concentration in the CS-climate reaches a steady state, in milligrams per cubic meter (mg/m3) N-air replacement rate per hour, the unit is times per hour (times/h) L-loading rate, the unit is square meter per cubic meter (m2/m3)

4.2 Calculation of indoor carrying capacity

The load-bearing capacity of the wooden floor for indoor floor heating shall be carried out according to formula (2).

D- Carrying capacity of wooden floor for floor heating, in square meters (m2) VE-The indoor volume occupied by the floor heating floor area, in cubic meters (m3) Cinfinity-The limit of formaldehyde concentration in indoor air that meets the requirements of GB 50325 (mg/m3) ER- the amount of formaldehyde released per unit area per unit time, in milligrams per square meter hour (mg/(m2﹒h)) 1h -1 hour

5.1 Instruments and equipment

5.1.1 Floor heating environment box

3 The technical parameters and requirements of the floor heating environment box should meet the requirements of LY/T 1612, and it is equipped with floor heating with a temperature range of 15°C~50°C Heating device, background concentration <=0.006mg/m3.See Appendix A for the principle of the floor heating environment box.

5.1.2 Other instruments

Others are in accordance with the provisions of 4.60 in GB/T 17657-2013.

5.2 Test piece

5.2.1 Specimen production

Take a number of wooden floor blocks for heating with an exposed area of not less than 1m2 as test pieces, remove the tongue and groove of the test piece, and keep the size of the test piece it is proved that when it is laid flat on the floor heating device, it will not be laid outside the floor heating device, and the exposed area of the test piece is 1m2 after edge sealing.

5.2.2 Balance treatment of test piece

According to the provisions of 4.60 in GB/T 17657-2013.

5.2.3 Edge banding of test piece

The four sides of the test piece with the tongue and groove removed and the back of the test piece are sealed with formaldehyde-free aluminum foil tape.

5.3 Test conditions

During the test, the following conditions were maintained in the floor heating environment.

5.4 Formaldehyde sample collection and analysis

The collection method and analysis method of formaldehyde are implemented according to 4.60 in GB/T 17657-2013, where the formaldehyde emission is accurate to 0.001mg/m

7.1 Inspection records

The format is shown in Table 2.

7.2 Inspection report

7.2.1 The inspection report shall include the following information. product name, specifications, inspection standards, etc.

7.2.2 Test results and conclusions.

7.2.3 Abnormal situations and other problems that need to be explained during the inspection.

Appendix A

(Informative appendix) Installing a floor heating device in a 1 m3 climate box should ensure that the internal volume of the box meets the requirements of the relevant volume in LY/T 1612; floor heating the air temperature deviation at 150mm above the device is within ±0.5°C (controlled by the temperature sensor above the floor heating plate in the front view); floor heating the environmental box should meet the structure and technical parameters and technical requirements of LY/T 1612.

The main body of the floor heating device is welded by 304 steel plate, the heating plate is hollow, and it is divided into three layers, and each layer of the heating plate has a water inlet, the water outlet and the air vent, the heating plate is equipped with a sensor to control the water temperature; a sensor is also installed at 150mm above the heating plate to monitor the ground the temperature of the air above the board (Figure A.1 front view), the integrated combination of the floor heating device and the climate box, see Figure A.2, the right view; the wind directly behind the box A sensor is installed above the fan to control the temperature in the entire cabin to keep it at 23°C; the floor heating device is connected to the outside of the cabinet through a joint and a silicone hose.

The heating water tank is connected, a heating rod and a temperature sensor are installed in the lower part of the water tank, and the water is circulated between the heating device and the water tank through a circulating pump.

Figure A.1 Schematic diagram of floor heating device structure

Figure A.2 Schematic diagram of floor heating environment box structure