Every time we go to the summer, we have to take a bath every day, otherwise it will be very uncomfortable. We usually install electric water heaters and gas water heaters at home, which is more convenient. Then we know which electric water heaters and gas water heaters save money ? The following small series uses a 200 liters of hot water per day for a household to carry out precise calculations. The result is very clear.
If we want to heat 200 liters of hot water from 10 ° C to 45 ° C, the required heat is 200 liters of water × one thousand calories / liter ° C * (45 ° C -10 ° C) = 7000 kcal
Need to use liquefied gas: heating with liquefied gas gas water heater: (thermal efficiency is calculated at 88%)
The required gas is: 7000 kcal / (A [see Note 3] * 0.88) = 0.3 cubic meters.
Need to consume natural gas: use natural gas gas water heater plus: (thermal efficiency is calculated at 88%)
The required gas is: 7000 kcal / (B [see note 4] * 0.880 = 0.86 cubic meters)
Requires power consumption: heating with electric water heater (calculated with 90% thermal efficiency)
The required power is: 7000 kcal / (860 kcal / kW [see note 5] * 0.9) = 9.04 degrees
1.3×0.86=1.118 yuan
0.53×9.04=4.79 yuan
Which electric water heater and gas water heater save money ?
The calorific value of 1 cubic meter of gas is four times that of one kilowatt hour. One cubic meter of gas is about 0.9 yuan, and the electricity is about 0.6 yuan. Considering that the thermal efficiency of electric water heaters is higher than that of gas water heaters, the end result is the same amount of heat. Water is half cheaper than gas.
Gas is fast, electricity is slow, but electricity is clean
2 electric heating is volumetric, can not supply hot water continuously, can only be used for one person to bathe with hot water. The gas is fast and easy to use and ready to use.
3 Although the heat generated by the complete combustion of the gas is large, a large part of the heat energy is also wasted and was not completely absorbed by the water while burning the water, and the thermal efficiency is much worse than the electricity.
4 The low efficiency of the internal combustion engine is caused by the high temperature of the exhaust gas, that is to say, a considerable part of the energy contained in the oil is converted into heat energy, and the heat energy generated by the water heater is mostly used to warm the water. The exhaust gas temperature has been quite low. There used to be an over-product, which was placed directly on the gas stove and placed on the water heater. It barely felt much heat, and the efficiency was high.
After reading the above mathematical calculations, it is very clear to know which electric water heaters and gas water heaters save money . Now know the benefits of mathematics. Well, it is awkward, but Xiaobian still reminds everyone that gas water heaters should be cautious in the process of use.
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