Solar drying design calculation
2.1 Calculate the drainage volume of drying materials:
WP1=?2000×(40%-23%)/ 1-40. %/7=80.9Kg
The drying time in the drying room is best for drying food between 60℃ and 75℃, and 70℃ is considered the typical temperature. After verification, the latent heat of vaporization of water at 70℃ is 2333KJ/Kg. ?
The heat in the drying process requires a total of three parts, see below:
Q=Q liters + Q gas + Q loss
Q liters The temperature needed to raise the temperature of wet materials and trucks transporting materials.
Gas Q is the heat needed to volatilize moisture from materials.
Loss Q The heat loss of the drying device
In Q Rise, Q1 is the heat required to heat the material, Q2 is the temperature required for the material truck to heat.
This can be calculated :
The energy required for drying is: 80 KW
Since the solar air collector is an instant heater, the solar working time is 7 hours and the daily heat required for heat collection is calculated. like 2016MJ.
2.3 Calculate the collection area of the air collector
——The illumination area of the direct system solar collector, m²;?QTotal——Total heat MJ
——The annual average daily irradiation on the heating surface of the local collector? the national standard value is 30%-80%); ——The full-day heat collection efficiency of the solar collector, the empirical value of the national standard is 0.40-0.55 and the experimental data is 0.4;? ——Heat loss rate, dimensionless, here is 0.2;