| 摘要 |
Method and device in order to establish the temperature efficiency in a heat exchanger (1), or the degree of recirculated air in an air treatment aggregate. The temperature is measured, partly in an exhaust air flow (4) before the heat exchanger (1) respective to a mixing location and partly in an uneven crosswise temperature division showing the supply air flow rate (3) after the heat exchanger (1) respective to the mixing location. Temperature measurement in the supply air flow rate (3) occurs in a single point which is chosen so that it is representative for the entire flow cross-section. The measuring devices (7, 8, 9) used give off an electric signal with a parameter proportional to the respective temperature. The temperature efficiency respective degree of recirculated air is calculated in an electric instrument (10) which the relation ship between one side and the other differs between the supply air flow rate and the exhaust air flow parameters. The result is given by the instrument (10) and/or compared by this with a pre-determined minimum value for giving a warning if a reading is less than the minimum value.<IMAGE> |
