IEC 60675-2018 pdf download.Household electric direct-acting room heaters – Methods for measuring performance.
8 Temperature rises of air-outlet grilles and external surfaces
The temperature rises of air-outlet grilles of convector heaters and fan heaters are determined.
The temperature rises of external surfaces are determined except for:
– heaters for mounting at a height above 1 ,8 m;
– the back of wall-mounted heaters;
– visibly glowing radiant heaters;
NOTE – The surface of radiant heaters through which the heating element is visible is considered to be an external surface and not an air-outlet grille.
The temperature rises are measured by means of the probe of figure 2. The probe is applied to the surface with a force of 4 N ± 1 N in such a way that the best possible contact is ensured.
Air-outlet grilles and their surrounds to a distance of 25 mm from the edge of the outlets are divided into a minimum number of equal rectangles having sides not exceeding 25 mm in height and 150 mm in length. The probe is applied to the grille as near to the centre of the rectangles as possible.
Other surfaces are divided into a minimum number of equal rectangles having sides not exceeding 150 mm. The probe is applied to the centre of the rectangles.
The temperature rise distribution, the highest and the average temperature rises of the various parts are stated, rounded to the nearest 1 K.
9 Temperature rises of surfaces surrounding the heater
The temperature rises of surfaces surrounding the heater such as walls, floor, ceiling and shelf are determined.
The measurements are made by using fine-wire thermocouples having a diameter not exceeding 0,3 mm, attached to the back of small blackened disks of copper or brass, 15 mm in diameter and 1 mm thick. The front of the disks are flush with the surface of the board. The thermocouples are positioned to measure the highest temperature rise of each surface.
The highest temperature rises are stated, rounded to the nearest 1 K.
1 0 Warming-up time of the heater
The warming-up time of the heater is determined.
The time taken for the heater to attain 90 % of the temperature rise under steady conditions is measured. The temperature rise of the hottest point of external surfaces or air-outlet grilles,whichever reaches steady conditions first, is used as a reference as long as it is representative of the temperature rise of the surface. NOTE – Steady conditions are considered to be reached when the temperature rise within 1 5 min does not vary more than 2 K. The warming-up time is stated to the nearest minute, preceded by “approximately”.
1 1 Stability of room temperature The amplitude and drift are determined for heaters incorporating an ambient temperature thermostat.
1 1 .1 Basic method of evaluation The heater is placed in the test chamber of a climatic test room (see annex A). The temperature inside the test chamber is measured for three different energy ratios which are obtained by changing the temperature in the refrigerating chamber, without changing the setting of the ambient temperature thermostat. The measurements are made when the average room temperature is stable over a period of five consecutive fluctuations or 2 h, whichever is shorter. The first measurement is made with the ambient temperature thermostat set to give a temperature in the test room between 20 °C and 25 °C at a high energy ratio. The high energy ratio is (80 ± 5) % but if the ratio is not attainable due to the capacity of the climatic test room, the highest possible energy ratio is used. NOTE 1 – If the energy ratio of (80 ± 5) % cannot be attained with a heater belonging to a family, the method of 1 1 .2 is used instead. The temperature of the refrigerating chamber is then increased to give an energy ratio of (50 ± 5) %, The third measurement is made with a low energy ratio. The low energy ratio is (20 ± 5) %, but if this results in heat-losses less than 150 W, the low energy ratio is that corresponding to 150 W.IEC 60675 pdf download.