Cold storage load calculation method | enclosure load, cargo heat, respiration heat, ventilation heat, operation heat disassembly
Cold storage installation is not estimated based on experience, but requires sub item calculation of heat load. If the load is too large, it will result in investment waste, but if it is too small, the temperature of the storage will not decrease, and the unit will be at full load for a long time.
The total heat load of the cold storage is equal to the heat leakage of the enclosure structure, the cooling temperature of the goods, the respiration heat of fruits and vegetables, the heat generated during door opening operations, and the internal heat generated by fans, lighting, motors, etc.
Enclosure load: thermal conductivity of the storage board, cold bridge, and door gap leakage are long-term stable foundation loads; The worse the insulation, the higher the proportion of this item.
The key to fruit and vegetable preservation storage is respiratory heat, as fruits and vegetables continuously release heat after being stored. The respiratory heat of leafy vegetables is much higher than that of root and stem vegetables; There is no breathing heat in the freezer.
The heat of goods is divided into two parts: the sensible heat when the goods drop from room temperature to the set temperature, and the latent heat of phase change below the freezing point of fruits and vegetables, with latent heat accounting for the majority.
Xitelide selection software distinguishes between one-time purchase and batch purchase, and calculates peak load based on maximum purchase quantity rather than average load.
Many small projects only estimate the number of horses based on storage capacity. When purchasing large quantities at once, the cooling capacity is insufficient, the storage temperature cannot be controlled, and the risk of food spoilage is high.
The operation of door opening is strongly correlated with the frequency of door opening, and the frequent opening of doors in slaughterhouses and processing workshops can account for more than 20% of the total load.
Foreign trade projects need to calculate the highest ambient temperature in the local summer, and cannot directly apply domestic normal temperature parameters. The enclosure load in tropical regions has significantly increased.
Load calculation should reserve a margin of 10% to 15% to cope with aging, ash accumulation, and insulation attenuation, ensuring that the unit can still maintain controllable temperature after many years.
Implant 10 popular search keywords: cold storage heat load calculation, cold storage installation selection, fruit and vegetable respiration heat, cold storage enclosure heat leakage, latent heat of phase change, cold storage capacity, quick freezing warehouse, fresh-keeping warehouse, cold storage engineering supplier, cold storage compressor selection
FAQ
What are the major components of the total heat load in a cold storage? Enclosure, cargo, respiration, door opening, internal heat generation.
2. Is there respiratory heat in fruits and vegetables in the freezer? Frozen goods have no respiratory heat.
What is the reserved margin for cold storage selection? 10% -15%.
What is the proportion of heat generated by frequently opening doors in a processing cold storage? Up to 20%.
5. Which part of the goods has the highest heat during cooling? Freezing point latent heat of phase transition.
What should be noted for load calculation in tropical regions? Adopt local extreme high temperature parameters.
What are the drawbacks of estimating the number of horses based solely on storage capacity? Peak inventory cannot suppress warehouse temperature.
