太陽(yáng)能熱水器的英文翻譯(編輯修改稿)
2025-01-09 11:59 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 However as long as it is clean the hot water can also be used in cooking to save time and fuel [1] This project relates to a control and protection system for a solar water heater apparatus which incorporates a temperature controlled variable speed drive for the circulating pump and a drain down valve which is responsive to low collector temperature high tank temperature and also to power loss to serve in bination as a device to optimize efficient energy collection The solar water heater with a control system as shown in figure 3 is suitable for all different configurations It is usually consists of three parts as follows A Solar collectors A flat solar collector is a very simple machine It consists of an insulated rectangular box It contains a metal plate usually copper that has been painted black with a pipe at each end called headers that are connected to small tubes called risers also made from pipe Water flows from the header into the risers Water is first heated in the risers and then returns to the storage tank The entire box is covered with a special glass that is hail resistant The entire box is then installed usually on the roof of a building and tilted so it can capture as much sunlight as possible [2] B Storage tanks Whether one uses a direct or indirect solar water heater a large storage tank will be needed The most monly used size is 80 gallons Solar water storage tanks look similar to standard water heater tanks But they are very well insulated to save the heat gained by the collectors Water is usually transferred from the solar water storage tank to a standard water heater tank Solar water heaters can heat water to a temperature that is much higher than needed in the home Therefore special valves called tempering or mixing valves are remended to control the water temperature If the solar heated water is too hot it mixes cold water with the hot water before it reaches the faucet C Group of transfer and control It contains the water channels to carry the cold water from the tank cold storage to the collector and the hot water from the collector to the tank heat storage These channels can be metallic or isolating [4] V PROTON PROGRAM Figure 4 shows the program of this project written in PROTON programming language which is the one of the most popular language for microcontrollers programming the program and after its execution it must be converted to Hexadecimal to be introduced to the PIC 16F877 automatically it can be also written in other programming languages and introduced to the microcontroller by other methods VI ISIS SIMULATION This simulation is built in ISISPROTEUS efficient software for electronics engineers The thermal sensor in this simulation can be represented by a voltage divider which sends an electrical signal to the analog port RA0AN0 of the PIC The ports RB0RB6 and RD5RD7 are the outputs which can be connected to four digital LDC to display the temperature of the hot water The output RD0 feeds in the DC motor This last adjusts the valve that passes the hot water [6] The need to simulate the constructed program appears indispensable from which the use of ISIS software help to well visualize the good operation of the system One has to verify the operation of the program before transferring it to the microcontroller which helps to economize the time and to increase the life duration of the PIC for this we have used the Hexadecimal file of the program Figure 5 shows the simulation of this project by using the ISISPROTEUS VII SIMULATION RESULTS One changes the NTC negative temperature coefficient thermistor value between two specified values TMIN 20oC and T 70oC Certain values of the measured temperature of the water are displayed in the LCD screen as shown in the figure 6 from which one can remark that the DC motor which symbolizes the pump in real time doesnt operate ever if the temperature exceeds T≈ 70oC and then if one minimizes this temperature the DC motor doesnt stop ever when the temperature is lower or equal to TMIN≈ 20oC Table 2 presents the results of the simulation of s
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