DIN EN 327 pdf free download

DIN EN 327-2014 pdf free download.Heat exchangers – Forced convection air cooled refrigerant condensers – Test procedures for establishing performance; English version EN 327:2014, English translation of DIN EN 327:2014-11.
7.2 Measurement criteria
7.2.1 Pipe side temperature measurement
Refrigerant temperatures shall be measured using one of the following methods:
a) Method A
When the temperature is measured on the outside of the connecting pipe it shall be measured at two opposite points of the same cross-section and, if the pipe is horizontal, there shall be one point above and one below.
The pipe shall be insulated on each side of the temperature measuring point for a length of at least 10 times of its outside diameter. It shall be ensured, that good thermal contact exists between the sensor and the pipe at the measuring point.
The measured value is the arithmetic mean of both individual values.
b) Method B
When the temperature is measured by a sensor immersed in the pipe, care shall be taken that temperature stratifications and flow patterns do not influence the accuracy of the measurements.
7.2.2 Condenser and gas cooler in let temperature
The inlet temperature shall be measured as near as possible to the inlet connection provided by the manufacturer ensuring that no liquid is present at the measuring point. Method B is preferred.
7.2.3 Subcooled refrigerant temperature
The subcooled refrigerant temperature shall be measured in the liquid of the receiver. Method B is required, ensuring that the device is permanently immersed in the liquid.
To achieve this, the temperature sensing element shall be placed in the liquid part of the liquid receiver required for free drainage.
NOTE This is especially significant as the refrigerant coming from the condenser does not have a uniform temperature and therefore needs mixing.
7.2.4 Water temperatures (Balancing air cooler – Air side calorimeter)
Water temperatures shall be measured as the water enters or leaves the air side calorimeter. Method B is required.
7.2.5 Gas cooler outlet temperature
The outlet temperature shall be measured as near as possible to the outlet connection provided by the manufacturer.
NOTE Method B is preferred.
7.2.6 Air temperatures
7.2.6.1 Air inlet temperature
The air inlet temperature shall be measured in the centre of equal sections of the face area. These sections shall not be larger than 0,2 m2 and be square if possible. There shall be at least 6 sections. Temperature sensing elements shall be shielded against radiation and any other form of heat transfer affecting the accuracy of the measurement.
If the air inlet area is orientated vertically, an additional temperature sensor shall be placed on the lower and upper verge of the inlet area in order to check that there is no significant temperature stratification.
7.2.6.2 Ambient air temperature for high and low pressure – calorimeter method
The ambient air temperature shall be the arithmetic mean of temperatures measured in the centre of six rectangular planes surrounding the insulated calorimeter and within a distance of 400 mm to 500 mm.
7.2.6.3 Air temperatures – air calorimeter room method
Air temperatures shall be measured 0,15 m perpendicular to the surface of the calorimeter.
If the calorimeter is in direct contact with the floor the temperature shall be measured on the outer surface of the insulation.
NOTE The quantity and location of temperature measuring points will be dependent on the calorimeter design and the variation in inside and ambient temperatures.
There shall be at least one inside and ambient temperature measuring point on each of the six surrounding surfaces.DIN EN 327 pdf download.