1、 1 外文文献： Prefab Cold Stores Part One Technology Overview The industrialization of agriculture has speeded deep-processing for agricultural products, finely processing for food, and the development of freeze and deepfreeze technology, and has demanded of further cold stores in tonnage, in scale, and
2、in modes. Thus, new cold stores for food processing and storing are born with the advance of science and technology and refrigeration. The new cold stores have substituted for the traditional ones in constructions and operations, through bran-new construction ideas, i.e. of standardization, of modul
3、arization, and of industrialization, etc. Prefab cold stores, increasingly widening their application scopes, and expanding their construction scales, is representing the leading developmental trend of refreeze and deepfreeze, endowed with brilliance of future. DBGC, the domestic largest manufacture
4、r for refrigeration equipment, has first introduced the technology of advanced prefab cold stores, and has drafted out the national standard for prefab cold stores. DBGC has undertaken for clients such complete technology of prefab cold stores as elaborations for technology programs designs for cold
5、 stores, refrigeration equipment, shield structure, stores heat preservations, electrical controls, installations, and executions for trials. Just within 3 months, DBGC can complete and present client with a satisfactory project of prefab cold store which includes designs and installations for cold
6、store. “Bingshan” prefab cold store is up to the requirements of exports transited in cold stores to European Union and Japan, enabling clients certifications from European Union and Japan to be granted easily. Now DBGC can offer prefab cold store from 10m3 to 20000 m3 in capacity， from 5 tons to 50
7、000 tons in tonnage volume, all will be met special requirements of clients, and flexibly scientific in designing and manufacturing. At present, DBGC is undertaking prefab cold stores projects worldwide. Part Two Technology Program The prefab cold store consists of shield structure， and prefab therm
8、al insulting board, etc, the thermal insulting board is on both sides paneled with color steel plate, aluminum plate and 2 stainless steel plate， with the core thermal insulting materials of generally ester urethane or polystyrene, etc， whose weight is 5%10% light compared with other construction ma
9、terials, and with the shield structure of light steel. Depending on the combination of thermal insulting materials with shield structure, there are external frame structure and internal no-frame structure for prefab cold stores. At present, the external structure prefab cold store is often used. 1st
10、, Store Boards Store board type: hardiness ester-urethane thermal-insulting board and poly-benzene heat preservation board. Now internationally, the hardiness ester-urethane thermal-insulting board with satisfactory heat transmit coefficient is generally used. This board is of polyester filmed color
11、 steel plate both externally and internally； with new convexity and concave groove structure of convenient installation， and with fine heat preservation of property. The store board, completely produced by the advanced production line exported from Italia, has met the international standard for all
12、technical data. connection modes： inlay connections、 PVC connections、 H-type aluminum connections、 pothook connections technical data of ester urethane board Item Standard Bingshan Density (Kg/m3) 40 50 40 50 Conduction Coefficient(w/m ) 0.022 0.022 Crushing Strength ( MPa) 0.2 0.27 Water-absorbing
13、Rate(Kg/m2) 0.03 0.17 Auto-ceasing time off fire (s) 7 1.97 Bending Strength ( MPa) 0.25 0.41 2nd, Refrigeration Technology To satisfy its requirements for refrigeration in tonnage and for food technology, the cold stores have applied ammonia cooling system, freon cooling system and indirect glycol
14、cooling system, etc. The ammonia system： the refrigeration medium is ammonia (R717)， through liquid ammonia the heat is carried away to satisfy freeze and deepfreeze 3 temperature for food； the freon system: the refrigeration medium is freon (R22、 R134a、 R404a), the system is highly automatic and qu
15、ite applicable for small prefab cold stores； the glycol system: fully automatic, simply and conveniently controlling, the system fulfill heat exchanges through narrow temperature gap in liquid glycol， which may reduce food loss for drying, and quite suits air-conditioned preservations for fruits and
16、 vegetables. 3rd, Refrigeration Equipment DBGC manufactures “Bingshan” screw refrigeration compressors, reciprocating refrigeration compressors and semi-hermetic refrigeration compressors. Superior in quality and excellent in services, DBGC can offer you a wide range of “Bingshan” refrigeration comp
17、ressors combinations worldwide, and provides you with top quality refrigeration equipment of effective energy-saving and high ratio of performance and price. 4th, Electric Controls For “Bingshan” prefab cold stores, both manual operations and automatic controls are available. The automatic controls
18、has risen to international advanced level in such fields as running and load and unload of refrigeration equipment, temperature of cold stores and refrigeration medium, dynamic stimulation for equipment running, printing and recording of running parameters， supplies for liquid, melting of frost， acc
19、idents alarm and its analysis, and condensation pressure, almost all controls for cold stores are executed under on duties of operators. 5th, Food Technology Wide ranges of processing technologies for food are acquired by DBGC, for example, processing, freeze and deepfreeze, storage and preservation
20、, etc. It is the ultimate ends that DBGC tries to best design refrigeration programs for clients in consideration of both food technology and refrigeration technology. Part Three Technology Framework 1st, Steel structure 2nd, Store and ground heat preservation 3rd, Moisture-proof and vapor-proof 4th
21、, Refrigeration equipment (ammonia system、 fluorin system and glycol system, etc） 5th, Equipment for damping store inside 6th, Equipment for rinsing frost and water-cooling 7th, Equipment for electrical controls 8th, Equipment for ventilation 9th, Other equipment（ for cold store doors、 security controls、 shield structure and auxiliary parts）
