Comparison Of Energy Consumption And Cost Per Ton Of Hot Water For Various Water Heaters

- Jan 09, 2021-

(Degree) unit of measurement of electrical energy


1 kilowatt hour (kW·h)=3.6×10^6 Joule (J)

1 Joule = 2.389×10^-4 kcal

(1000 calories is equal to 1 kcal, and kcal is a common name, equivalent to kilocalories)

1 degree = 1 kilowatt hour (kW·h) = 3.6×10^6 Joule (J)

= 860.04 kcal


The formula for calculating the heat required to heat 1 ton of cold water from 15°C to 55°C:

Q=1000kg×(55℃-15℃)×1kcal/kg℃=40,000kcal


Details of energy consumption costs for various water heaters (cost per ton of hot water energy consumption)


1. Electric water heater

A. The electric heat conversion rate of the electric water heater is 95%, and the maximum heat generated per kilowatt-hour is

Q=860 kcal/degree×95%=817 kcal/degree


B. Power consumption of 1 ton of hot water

40000 kcal ÷ 817 kcal/degree = 48.96 degrees


C. The domestic electricity price is 0.558 yuan/kWh (the price varies slightly from place to place), then the cost per ton of hot water:0.558 yuan/degree×48.96 degrees=27.32 yuan


2. Liquefied petroleum gas

A. The heat conversion rate of liquefied petroleum gas is 80%, and the maximum heat per kilogram is: Q=12000kcal/kg×80%=9600kcal/kg


B. The consumption of liquefied gas for 1 ton of hot water: 40,000 kcal ÷ 9,600 kcal/kg = 4.17 kg


C. The price of bottled liquefied petroleum gas is 8.00 yuan/kg (the price varies slightly from place to place)


Cost per ton of hot water: 4.17 kg × 8.00 yuan / kg = 33.36 yuan

D. 1 kilogram of liquefied petroleum gas is equivalent to 0.52 cubic meters of vaporized petroleum gas, and the price of pipeline liquefied petroleum gas is 16.2 yuan/cubic (the price varies slightly from place to place), then the cost per ton of hot water: 4.17 kilograms × 0.52 cubic meters/kg × 16.2 Yuan/cubic = 35.13 yuan


3. Natural gas

A. The heat conversion rate of natural gas is 70%, and the maximum heat per cubic meter of natural gas is Q=8500 kcal/m3×70%=5950 kcal/m3


B. The consumption of liquefied gas for 1 ton of hot water is 40,000 kcal ÷ 5950 kcal/m3 = 6.72 m3

C. The price of civil natural gas is 3.8 yuan/m3 (the price varies slightly from place to place), and the cost per ton of hot water: 6.72m3×3.8 yuan/m3=25.54 yuan


4. Diesel

A. The heat conversion rate of diesel is 70%, and the maximum heat generated per kilogram of diesel is 10200 kcal/kg

Q=10200 kcal/kg×70%=7140 kcal/kg

       

B. The amount of diesel fuel consumed by 1 ton of hot water: 40,000 kcal ÷ 7,140 kcal/kg = 5.6 kg

       

C.0# diesel is 8.00 yuan/kg (the price varies slightly from place to place), then the cost per ton of hot water: 5.6 kg × 8.00 yuan/kg = 44.8 yuan


5. Solar water heater

A. Daytime: According to the Yangtze River Basin, the annual average is 120 days without sunshine (cloudy, raining), and electric heating is required to supplement, then the cost per ton of hot water: (48.96 degrees × 120 days) ÷ 365 days = 16.1 degrees × 0.558 yuan /Degree=8.98 yuan

       

B. Night: The cost is equivalent to that of an electric water heater, 27.32 yuan per ton of hot water.


6. Air energy water heater

A. The annual average thermal efficiency of air thermal water heaters is 3 times that of electric water heaters. The amount of heat generated per kilowatt-hour of electricity: 860 kcal/degree×95%×3=2451 kcal/degree

       

B. Electricity consumption of 1 ton of hot water: 40,000 kcal ÷ 2451 kcal/degree = 16.32 degrees

       

C. The price of civil electricity is 0.558 yuan/kWh, so the cost per ton of hot water: 16.32 kWh × 0.558 yuan/kWh = 9.11 yuan


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