IC Card Prepayment Heat Meter System

IC card prepayment heat meter is not only able to solve the measure problem of heat consuming in the heating supply, but also to solve the charging problem effectively. It's the best measure instrument to adapt to the heating reformation.ForewordIn a quite long period, the heating supply in our country always keep to the concept of plan economic and supply welfare service for the enterprise units and residents. The welfare heating supply system will be the last fort of the welfare system. The heating supply industry will be the last position of the plan economic. At present, the malpractice of the heating charge system increasingly stands out. In one hand, the consumer cannot always enjoy the high quality heating service, but the consumers whom didn't charge can also get the heating supply. In the other hand, the heating administration cannot collect the heating charge and can not ensure operate normally. So the heating supply will get into the vicious circle, especially the three-north area, it is more austerity for the heating charge formal in the winter. The Ministry of Construction point out definitely in the development aim in "Construction energy saving 'nine-five'programming and 2010 programming": For the concentration heating supply domestic construction will gradually install heat meter and regulation instrument in the future ten years and put in practice the working according to the meter charging. In 2000 the Ministry of Construction No.76 order "domestic construction energy saving management regulation", it emphasizes on from Oct 1st, 2000, the concentration heating system of the new built house will use separate consumer controlling and heat measurement units. It will be imperative under the situation for the heating reformation and separate consumer charging. According to the report of the foreign country, to push the measurement charge will save 20%-30% energy. The heat meter is the key instrument for carrying out the heating measurement. But the common heat meter can only solve the measurement problem; it cannot solve the charge problem radically. The IC card prepayment heat meter applying system can solve the charge problem radically and also benefit for the heating supply administration to realize the work automatically.1. Summarize for the IC card prepayment heat meter applying system 1.1 IC card prepayment heat meter applying system composition IC card prepayment heat meter applying system consists of IC card prepayment heat meter, transmission media IC card and computer sales management system.1.2 The working procedure of the IC card prepayment heat meter applying systemAt first you should build the user records in the management system and create user, prepay management. You can write the heat prepayment into the IC card by the computer sales management system. The use inserts the IC card, which has prepayment in it into the IC card prepayment heat meter. After the IC card prepayment heat meter identify the legality of the card, the data in the card will be written into the meter and open the valve for supply heating. When the prepayment is shortage, it will have a beep to prompt the user the IC card is short or remaining, the user should charge as soon as possible; when the remaining is less than a certain degree, the IC card prepayment heat meter will shut off the valve automatically and stop supplying heating. At this time, the user should hold the card to charge again for resuming heat supplying normally.2. IC card prepayment heat meter2.1 IC card prepayment heat meter compositionIC card prepayment heat meter mainly consists of flow sensor, temperature sensor pair, IC card prepayment calculator, and prepayment control valve.2.2 The working principle for the IC card prepayment heat meterHeating is mass flow rate, the enthalpies difference is integral of the time. To calculate the heat, you should get the mass flow rate, so it need flow rate sensor. But at present the economical applicable flow rate sensor is volume flow rate sensor. So du...