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General principles for the design and layout of commercial refrigeration refrigeration systems (four)

author: supermarket refrigerated showcase category: commercial refrigeration Views: 764Time: 2016-08-22

Disadvantages:

(1) The degree of automation is not as high as indirect refrigeration systems, when adjusting electromagnetic constant pressure valves It must be manually adjusted on site, unlike the indirect commercial refrigeration refrigeration system, which can be directly set by a computer remotely.

(2) The fluorine system pipeline is longer than the indirect refrigeration system, which is prone to leakage.

(3) When the system leaks, food is easily contaminated.

(4) requires higher installation requirements for refrigeration systems than indirect refrigeration systems.

(5) The refrigerant charge is more than indirect system.

(6) If the Freon thermal expansion valve is used for direct liquid supply system, the evaporation area of the air cooler will increase by 20% compared with indirect refrigeration.

7. Determination of the evaporative circuit of the refrigeration system There are two types of evaporative circuits, single-circuit and combined. The general options for the evaporative circuit are as follows.

(1) Ice making and ice storage commercial refrigeration generally use the same evaporation circuit.

(2) Freezing and freezing commercial refrigeration When the freezing capacity and frozen storage volume are large, in order not to affect the dry consumption and quality of frozen food, an evaporation circuit is set separately. When the amount of freezing is small or does not work often, it can be combined into an evaporation circuit, but attention should be paid to prevent the freezing room from affecting the evaporation pressure in the freezing room.

(3) commercial refrigeration of cooling materials should use an evaporation circuit.

(4) Cooling commercial refrigeration can share the evaporation circuit with commercial refrigeration for ice making and ice storage. Fruits, vegetables, and fresh eggs can also be used with commercial refrigeration for refrigeration of chillers when the cooling capacity is small. Attention should be paid to the influence of different combinations when adopting the evaporation circuit combination scheme. Such as fruit, vegetable, fresh egg storage and ice making, although the two evaporation temperatures are close, the former requires small temperature difference between commercial refrigeration temperature and evaporation temperature and high relative humidity, while the latter requires large load fluctuations and low evaporation temperature. The dry consumption of refrigerated food will be increased later, so it is not appropriate to merge. For small other loads, they can be combined in an evaporation circuit.

8. Determining the defrosting and draining plan. The defrosting plan includes: manual defrosting, hot gas defrosting, water flushing, electric heating defrosting: the draining plan includes: draining condensate into the drain bucket and draining condensate into the low-pressure cycle The barrel and condensate are discharged to the working evaporator, etc. The defrosting and draining plan should be determined according to the characteristics of each plan and the design requirements of commercial refrigeration rooms.

9. Others such as data display, control method determination, etc.

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General principles for the design and layout of commercial refrigeration refrigeration systems (four)

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