| 摘要 |
An object of the invention is to provide a device, such as a heat meter (20) for measurements of hot tap water (6) energy usage, separated from building heating energy usage, in a district heating substation (1). The device (20) is connected only to sensors attached to the supply pipe (2) and return pipe (3) of the district heating substation (1). A device (20) , such as a heat meter, comprises a detection means (24) to detect a deviation in the total power (P) usage in the district heating substation (1) which deviation depends on the use of warm tap water; the device comprises means to calculate (25) energy consumption in the heat' exchanger (4a) related to building heating, and the energy consumption in the second heat exchanger (5a) related to tap water heating. The device (20) comprises means to calculate (25) energy consumption for tap water heating, which relates to the duration of the deviation. A further object is to provide a method for measurement of energy usage for tap water heating separated from energy usage for building heating, using measurements from the flow meter (21) and the temperature sensors (22) , (23) . |
