The programme scope covers the heat recovery exchangers with intermediate heat transfer medium corresponding to the category IIa (“without phase change”) of the EN 308:1997 standard, that is Run Around Coils systems.
The present programme does not cover other types of air to air heat exchangers like Air to Air Plate Heat Exchangers (AAHE) or Air to Air Regenerative Heat Exchangers (AARE) for which dedicated Eurovent Certified Performance programmes exist.
For definitions regarding the certification scheme refer to Certification Manual.
Heat recovery system with intermediary heat transfer medium
Heat exchanger or combination of heat exchangers that transfer heat between exhaust and supply air flows by the means of an intermediary heat transfer medium and depending on the differential of temperatures.
Run around coil system
A run around coil system, simply called “system” in the programme, consists of a coil in the extract air and a coil in the supply air; with a pipe system in between to transfer the recovered energy from one air stream to another.
The coil located in the extract-exhaust air stream is called “exhaust coil” and the coil located in the outdoor-supply air stream is called “supply coil” in the HRS-COIL Certification programme.
Range for Run around coils
Coils dedicated to heat recovery and having the following identical features:
A bank of tubes that are located in a plane at right angle to the direction of the air flow.
Basic Model Group
Within a range, models which are essentially the same or comparable in terms of basic components and/or configurations combinations are gathered into basic model groups (BMG).
The following variations distinguish one BMG from another:
A reference fin spacing (RFS) is considered representative of a range of fin spacings from 0.7 to 1.3 times its value.
Example: The applicant range covers fin spacings (FS) from 2.0 to 8 mm in the following steps: 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 mm. Considering the aforementioned rule there are three (3) reference fin spacings (RFS):
Dry heat recovery efficiency
The temperatures at the coils limits are the following:
t11 : exhaust air inlet (“extract air”) dry temperature (°C)
t12 : exhaust air outlet (“exhaust air”) dry temperature (°C)
t21 : supply air inlet (“outdoor air”) dry temperature (°C)
t22 : supply air outlet (“supply air”) dry temperature (°C)
The dry heat recovery efficiency is a temperature ratio defined on the supply-air side for equal air flows and winter conditions (no condensation on the exhaust air side):
When tested in the laboratory the obtained performance data shall not differ from the recalculated values (“test-check”) by more than the following tolerance values:
Dry heat recovery efficiency: -3 percentage points (abs. deviation)
Air side pressure drop : Maximum [+10%;+15 Pa]
Fluid side pressure drop : Maximum [+10 % ; +2 kPa]