Abstract
The paper presents a technical and economic analysis regarding the sandwich panels with polyurethane insulation layer (PUR) used in cold stores’ construction. The authors determine the optimal thickness of the insulating layer (OIT) corresponding to the 5 climatic zones in Romania. The operating and investment costs for cold and frozen storage in these 5 climatic zones have been assessed. The results obtained from the analysis show that regardless of the climatic zone, the OIT for cold storage is 150 mm and for frozen storage is 180 mm. The investment cost increases by 41% and the expenditure on operating energy decreases by 8.3% for 180 mm for cold storage in comparison to OIT. Moreover, this tendency is maintained as well in the other case of frozen storage, where, by increasing the thickness above OIT at 200 mm the investment cost is increased by 20% and the expenditure in operating energy is decreased by 6.7%. The SEC has an average value of 54.83 kWh·m3/yr for cold storage and 74.55 kWh·m3/yr for frozen storage respectively. The average values obtained in the paper were compared with those presented in the literature and resulted in deviations of about 1.58% for refrigeration, and hence 4.1% for freezing.
Highlights
In the view of the current upward trend in electrical energy prices, there are growing concerns in all branches of industry and installations about ways to reduce the costs of energy consumers
This was performed for the cold storage placed in different climatic zones on the Romanian territory, insulated with sandwich panels with polyurethane insulation layer (PUR) insulation
The novelty of the study comes from the fact that we determined OIT for each climate zone specific to Romania, considering the specific investment and exploitation costs, which are significantly different to other states in the European Union
Summary
In the view of the current upward trend in electrical energy prices, there are growing concerns in all branches of industry and installations about ways to reduce the costs of energy consumers These concerns aim at the large-scale use of energy from renewable sources and at improving existing facilities and equipment so that their energy consumption is reduced. By balancing the necessary costs for the initial investment to build the cold storage and estimating the necessary costs to ensure the refrigeration load, we established an optimal thickness of the insulation. This was performed for the cold storage placed in different climatic zones on the Romanian territory (according to the national regulations, in Romania there are five climatic zones), insulated with sandwich panels with PUR insulation
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