EN 15181-2017 pdf download.Measuring method of the energy consumption of gas fired ovens.
7 Energy consumption and time
7.1 Measurement of oven temperature
The oven temperature of each cooking mode, as appropriate (see Clause 3), shall be measured separately. During the test only one cooking mode (see Clause 3) shall be used.
The air temperature in the empty oven is measured with a thermocouple, according to 5.6, fixed to the grid which is delivered with the oven and placed in the oven in a way that the welded point of the thermocouple is located at the centre of the useful volume of the oven with a distance of at least 30 mm from the grid.
7.2 Energy consumption and time for heating a load
7.2.1 Purpose
The purpose o this test is to measure the energy consumption and the time for heating a load. The load is a water saturated brick as defined in 7.2.2 which simulates both the thermal properties and the water content of food (e.g. meat).
7.2.2 Preparation
Before heating the brick, which has been treated according to 5.5, It shall be put into a water container so that It is completely covered with water of less than 20 °C. The water container with the brick is placed for at least 8 h into a temperature controlled environment, for example a refrigerator and cooled down until the centre temperature of the brick (both thermocouples) is (5 ± 2) °C.
A hot brick shall be cooled down in air to a centre temperature below 25 °C before putting it into the cold water.
NOTE 1 A hot brick put directly into cold water would absorb substantially more water due to the capillary effect and different water viscosity at different temperatures.
NOTE 2 The brick gets approximately the same water content each time it is soaked in water. It is not necessary to dry it completely between uses.
When the water saturated brick with the thermocouples is taken out of the water container, excessive water is allowed to drip off for 1 mm. The mass of the wet brick m shall be measured and the absorbed amount of water (W) is determined In g taking into account the mass of the thermocouples by calculating W = m – md (md measured according to 5.5). The amount of absorbed water shall be as specified in Annex A.
Immediately before placing the brick of the oven, the temperature of the brick is checked. Both thermocouples (T1, l’z) shall read (5 ± 2) °C.
7.2.3 Measurement
7.2.3.1 Procedure
Each appliance is tested in accordance with the setting values given in Table 1.
With the appliance at ambient temperature in accordance with 5.2, the brick, prepared according to 7.2.2, is placed In the geometric centre of the calculated oven volume with its largest surface centrally on the grid delivered with the oven, with the thermocouples on the upper side. The grid is inserted into the shelf support level of the oven which ensures that the centre of the brick comes as close as possible to the centre but not higher (if this arrangement is not possible, use an arrangement which is as close to the centre as possible) than the centre of the calculated oven volume. The longer axis of the brick shall be parallel with the oven front.
Where the grid can be inserted In two different positions (e.g. upside down gives a different height), the position should be such as to ensure that the centre of the brick comes as close as possible to, but not higher than, the centre of the calculated oven volume.
The thermocouples shall be led through the door gap in a way that the door is completely closed without applying additional force.
The measurement shall be started by switching on the oven within three minutes from the removal of the brick from the refrigerator. The temperature control is set to positions where the mean oven temperature rises i7 as defined in Table I can be expected. ti7 is the difference between the average ambient temperature and the actual oven temperature (measured in 7.2.3.2), k = 1, 2, 3.
The temperature in the centre of the oven at the beginning of the test (T01) in °C is determined as described in 7.1.
NOTE To avoid possible modification of the temperature control set, it is suggested to fix the knob at the control temperature.
The average ambient temperature (Tav) during the test Is determined by the arithmetic mean of the ambient temperatures measured in accordance with 5.2 at the beginning of the test (Tn) (i.e. when switching on the oven) and when the two thermocouples in the brick have reached a centre temperature rise of 55 K (Tr).EN 15181-2017 pdf download.
EN 15181-2017 pdf download
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