Can Prefabricated Panel Houses Be Used as Cold Storage?
Prefabricated panel houses are generally not suitable for direct conversion into cold storage facilities. The main reasons are as follows:
1. Insufficient Structural Stability
The walls and floors of prefabricated panel houses are typically assembled from prefabricated concrete panels, resulting in poor overall integrity and weak earthquake resistance. Cold storage facilities require long-term maintenance of low temperatures (usually between -18°C and -25°C). Ordinary prefabricated panel materials are prone to cracking due to shrinkage stress under low temperatures, which can affect the overall structural safety of the house. For example, concrete becomes more brittle at low temperatures, and repeated freeze-thaw cycles can accelerate material degradation, posing safety risks.
2. Substandard Thermal Insulation Performance
The core requirement of cold storage is efficient thermal insulation to minimize cold loss. Professional cold storage facilities typically use polyurethane foam panels (with a thermal conductivity of ≤0.024W/(m·K)) or polystyrene panels as insulation layers. In contrast, the walls and floors of prefabricated panel houses are mostly made of ordinary concrete (with a thermal conductivity of about 1.7W/(m·K)) and are not designed with dedicated insulation structures. If directly converted, an additional 10-15 cm thick insulation layer would be required. However, the poor surface flatness of prefabricated panels makes it difficult to adhere insulation materials, leading to the formation of cold bridges and increasing energy consumption by 30%-50%.
3. Difficulty in Ensuring Airtightness
Cold storage facilities have extremely high requirements for air leakage rates (usually ≤2m³/m²·h). However, the joints between panels and the interfaces around doors and windows in prefabricated panel houses are natural sources of air leakage. During conversion, all joints must be sealed (e.g., using expanding foam or installing airtight strips). However, the risk of structural deformation in prefabricated panel houses is high, and the sealing materials are prone to detachment after long-term use, leading to cold air leakage.
4. High Cost of Electrical Upgrades
The compressors of small to medium-sized cold storage facilities typically have a power range of 5-15kW and require 380V three-phase power support. However, the original electrical circuits in prefabricated panel houses are mostly 220V single-phase power. Conversion would require re-laying cables and adding distribution boxes, with costs accounting for approximately 20%-30% of the total conversion expenses. Additionally, the high starting current of cold storage equipment places high demands on grid stability, and the aging wiring in old prefabricated panel houses may further increase safety risks.
Conversion Recommendations
If prefabricated panel houses must be used, structural reinforcement (e.g., adding steel support frames), whole-house thermal insulation treatment (using sprayed polyurethane or external insulation panels), custom airtight doors and windows, and electrical system upgrades would be necessary. However, the total cost may approach that of constructing a new prefabricated cold storage facility (which uses standardized cold storage panels with integrated thermal insulation and sealing, has a short construction period, and low energy consumption). Therefore, constructing a new professional cold storage facility is recommended as a priority.
