The quantity of water stored in a solar hot water tank is equivalent to the quantity of hot water for one day. First, you need to determine the number of permanent residents and the amount of hot water used per person, then calculate the quantity. total quantity of hot water for a day. Then, depending on the total amount of hot water and 1 m2 of solar energy, the hot water production capacity of the collector F (75-90 kg/day.m2), the designed area of the solar collector S (m2) and the capacity of the insulation water tank V (m3). The average amount of hot water used by users at 55°C can be referenced to the following parameters:
1. Domestic users: 80-100 kg/person.day of water for shower, < /p>< p> 2. Use of water from factories for showers of employees and schools: 40-60 kg/person.day
3. Use of water for showers of hotels: 80-120 kg/person.day
4, Bath watere: 300 to 500 kg/person·day.
Determine the total amount of hot water used for a day P (kg) and divide P (kg) ÷ F (kg)/m2 to obtain the area of the solar collector S (m2), according to the ratio of the thermal insulation water tank capacity of 0.1 m3 per square meter of solar collector, the thermal insulation water tank capacity can be calculated: V=S (m2)*0.1 m3/m2.
The cost of solar water heaters is directly related to the surface area of the solar collector and the volume of the thermal insulation water tank. It is close to a direct relationship. Considering the user's long-term and overall interests, it is appropriate to choose a larger solar collector area is beneficial to users, because investing more in solar hot water for the first time will be more sufficient and the operating costs will be saved in the coming years.