The water tank capacity of the air energy system in a foot massage shop should be scientifically designed in combination with the water usage pattern and equipment performance to match the passenger flow. In terms of basic parameters, the per capita single water consumption is recommended to be 80-120L (high-end places can be increased to 150L), the water temperature needs to be stable at 45-55℃, and the peak water consumption from 6 to 10 pm accounts for 60%-70% of the whole day. When calculating the total hot water volume, the average daily passenger flow is multiplied by the per capita water consumption, such as 300 people/day requires 30 tons of hot water. During peak hours, a coefficient of 1.5-2.0 needs to be considered to ensure that 10%-13% of the daily water volume is supplied within 1 hour. The water tank capacity is usually configured at 30%-50% of the total daily water volume to reserve hot water for low-peak electric heating. In extreme cases, it is necessary to meet the immediate demand during peak hours. Reference for host and water tank configuration: 10-15 ton water tank + 2 10-horsepower hosts are recommended for 200-300 people, 20-30 ton water tank + 4 hosts for 400-600 people, and 40-50 ton water tank + 6-8 hosts for 700-1000 people. Intelligent control system should be used to dynamically adjust heating power during the off-peak hours at night, and maintain low water temperature during the day. Multiple hosts in parallel and water tank expansion reserve can ensure system redundancy, and closed circulation and thickened insulation layer (≥50mm) can reduce energy consumption. It is recommended to use 316L stainless steel water tanks in the south, and anti-freeze measures should be strengthened in the north. The distance between the host and the water tank should be controlled within 5 meters to reduce heat loss. The case shows that a 20-ton water tank + 4 main units can stably supply 12 tons of hot water during peak hours for 400 people/day, with a system COP value of 3.8, an average daily power consumption of 280 degrees, and a 55% reduction in operating costs compared to gas boilers. Through reasonable matching, the air energy system of a foot massage shop can achieve a water guarantee rate of more than 95%, an energy saving rate of more than 60%, and an investment payback period of 2.5-3 years.
