Based on energy balance, is it correct to assume that 1 ton of circulating water requires 7 kWh of electricity?
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Based on energy balance, is it correct to assume that 1 ton of circulating water requires 7 kWh of electricity? Assuming a temperature rise of 6 degrees, 1 ton of circulating water would cost 5.6 yuan; what if the electricity cost is calculated at 0.8? What feels off?
According to the energy balance equation, Energy = Mass * Specific Heat * Temperature Difference. For 1 ton of circulating water, with a temperature rise of 6 degrees, the energy required is 1000*4.18*6=25008 joules. And 1 kilowatt-hour is approximately 3600 joules, so the amount of electricity required is 25008/3600≈6.9 kilowatt-hours. Therefore, the conclusion that 1 ton of circulating water consumes 7 kWh of electricity is basically correct. Regarding the cost calculation, assuming the electricity cost is 0.8 yuan per kilowatt-hour, the electricity cost for 1 ton of circulating water is 7*0.8=5.6 yuan. This calculation is correct. .
Take a look at the relationship between the pump’s power and flow rate. Under normal circumstances, such high energy consumption is not necessary
Power consumption per ton of circulating water = Operating current × Voltage (0.38) × 1.732 × 0.9 (if there are multiple circulating water pumps, the values should be summed up) / Hourly flow rate of circulating water. This is a rough way of calculating it
What kind of stupid algorithm is this? Do you have any practical experience with it? The energy consumption of circulating water is mainly due to the pumps used for circulation and the fans in the cooling towers; cooling is achieved through water evaporation and air convection. Even in the case of refrigerators, the calculation does not take 100% of the electrical energy consumption into account
I didn’t get what the OP meant. Like you, my first thought was that the electrical consumption associated with water circulation is the power used by the circulation pumps and the fans in the cooling towers. The power consumption of a circulation pump is related to the pump efficiency, pipeline resistance, and back pressure. The power consumption of a cooling tower is related to its efficiency; in actual operation, the power consumption is directly tied to the wet-bulb temperature, and in winter it may even be possible to avoid using fans. His temperature rise is 6°C, and his power consumption per unit of output is 7 kWh – which is quite high, almost absurdly so. To calculate it in detail, some effort is required.
The actual power consumption in most circulating water systems ranges from 0.2 to 0.3 kW·h/m3.