First, it depends on the brand of solar power you use,
Second, it depends on how many solar tubes you have,
Third, it depends on your solar tubes. How long,
Fourth, how much water remains in solar energy.
Fifth, what is the weather like?
Sixth, what is the temperature of the incoming water?
Finally, consider the most general situation, the water is complete and ordinary solar brands, the weather is good, and the length and number of pipes from the manufacturer basically match the size and design of the water tank. . . Using solar energy in Guangzhou can make the sun hot in one day in summer and more than 45 degrees in two days in winter. Generally, you can take a bath when the temperature is above 45 degrees.
How long does it take to get hot water after water supply solaire?
Generally in summer, the hot water temperature reaches 38 degrees, and it takes about 6 or 7 minutes for each degree of increase. In winter, the hot water temperature only needs to exceed 45 degrees, and it takes about 10 to 12 minutes for each degree increase.
The electrical heat per kilowatt hour is 860 K and the conversion rate is 92%. If 200 liters of water goes from 20 degrees to 70 degrees and the temperature increases by 50 degrees, the required power consumption is 200. *50/(860*92%) = 12.6 degrees. Electricity, using a 1.5 kW electric heater requires time: 12.6/1.5 = 8.4 hours.
It takes an electric heating time of 2.5 kW: 12.6/2.5 = 5 hours. If 70 degree water is exposed indoors at 10 degrees, it will become cold in about 20 minutes if it is in a water tank. , the temperature of a good water tank will not drop more than 10 degrees 24hours a day, and the best water tank will not drop more than 5 degrees.
Detailed information:
1. Even in harsh winter, if there is no water in the water tank, the water should not be filled immediately after air drying, because the temperature inside the tube will vacuum can reach approximately 2500°C. during air drying, there is no water in the water tank. Watering or underwatering should be done before sunrise or half an hour after sunset to avoid pipe bursting.
2. If an auxiliary heat source is installed, the auxiliary heat source device and heat exchanger should be checked regularly to see if they are functioning properly. For auxiliary heat sources heated by electric heating pipes, you must ensure that the provisionitif leak protection works reliably before use, otherwise it cannot be used. When using the electric auxiliary heater, special attention must be paid to filling the water. The volume of water in the water tank should not be less than 50% to avoid dry burning without water.
3. When taking a bath, pay special attention to unplugging the power plug, and it is strictly prohibited to use it when the power is on.
4. When installing heating tapes, be sure to choose products of acceptable quality to ensure normal use and reduce hidden dangers. When using the heating tape, be sure to turn it off promptly after defrosting, and try not to use it when the voltage is unstable.
Baidu Encyclopedia - Solar Energy
Baidu Encyclopedia - Heat Calculation Formula
As you can see, an average pipe carries about 10KG of hot water
A vacuum tube is 58-1m8, with a heat collection area of about 0.085㎡. The amount of solar irradiation in class II areas is 5850-6680 MJ/m2, and the daily irradiation. The quantity is 16.027 to 18.301 MJ/m2, here take 17 MJ/m2, then the heat absorption of each pipe is 1.445 MJ
Assume that the increase in water temperature i.e. △T
Then 1445000=
< p>10×4200×△TThat is to say: △T=1445000/(10×4200 )=34.405℃
That is, the initial water temperature of a generally configured vacuum tube generally rises to 34.405℃ in one day. It is generally 15℃, and the bath temperature is generally 38℃
As long as the temperature increase reaches 38-15=23℃
The average increase of the temperature of solar energy per hour is: 34÷8=4.5℃ liter
Then 23÷4.5=5 hours, that is-i.e. there will be hot water for bathing in about 5 hours