畢業(yè)設(shè)計英文翻譯----智能熱能表控制器-其他專業(yè)(編輯修改稿)
2025-02-24 04:14 本頁面
【文章內(nèi)容簡介】 nstant temperature bath (HAAKE BathK, German), whose temperature can be varied in steps of 176。C. A mercury glass thermometer (ARNO AMARELL, Germany) with a resolution of 176。C is also placed along with PT100 sensor in the bath. This is pared with the instrument readings. The accuracy of the instrument in temperature measurement is 177。176。C. Hence, the accuracy in differential temperature measurement is 177。176。C. The flow sensor having a maximum flow rate of 1250 l/h is used for flow measurement. It is calibrated by fixing it in the upstream of a pipeline of length 8 m. The sensor output is connected to a digital frequency counter to monitor the number of pulses generated with different flow rates. Water collected at the sensor outlet over a period is used for estimating the flow rate. The Kfactor of the sensor is 3975 pulses/l. The uncertainty in flow measurement is 177。% at 675 l/h. Uncertainties in density and specific heat of water are 177。 kg/l and 177。 kJ/kg176。C respectively. Maximum amount of energy collection (Q) = 67515/3600 = . Uncertainty in energy measurement ωq/Q = [(ωv/V)2 + (ωρ/ρ)2 + (ωcp/Cp)2+(ωt/T )2]1/2. 3 Inaccuracy in electronic circuitry is 177。 kW. The inaccuracy in energy measurement is 177。% 4 Field test The instrument is incorporated in a solar water heating system as shown in Fig. 2. It consists of five solar flat plate collectors having an absorber area of m2 each. The absorber is a fin and tube extruded from aluminium and painted with matt black paint. The collectors are mounted on a rigid frame facing south at an angle equal to the latitude of Bangalore (13176。N). They are arranged in parallel configuration and connected to a thermally insulated 500 l capacity storage tank. A hp pump is used for circulating the water through the collector field. All the pipelines are thermally insulated. The temperature sensors and the flow sensor are incorporated in the system as shown in Fig. 2. The data on solar radiation, ambient temperature, water flow rate, solar collector inlet and outlet temperatures and the system heat output are monitored at regular intervals. Fig. 2. Solar water heating system with thermal energy meter cum controller. The performance of the solar water heating system with TEMC on a partial cloudy day is show
高考資料相關(guān)推薦
鄂ICP備17016276號-1