Installation of cold storage equipment in refrigeration system?

1) Before building the cold storage, users are required to lower the ground of the cold storage area by 200-250mm and do a good job of leveling in the early stage; 2) It is required to leave a drain floor drain and a condensate drain pipe under each cold storage. There is no drainage floor drain in the cold storage, and the condensate drain pipe must be located outside the cold storage; 3) The low-temperature warehouse requires laying electric heating wires on the ground for standby. After laying electric heating wires on the ground, the ground insulation layer can only be laid after the preliminary protection of about 2 mm. If the floor where the cold storage is located is the lowest floor, the floor of the low-temperature storage can be free of heating wires. Common cold storage floor treatment methods are as follows: 2. Insulation board must meet the national standards and hold the inspection report of technical supervision bureau. 2. 1 thermal insulation material The thermal insulation material should be polyurethane foam composite thermal insulation board with plastic-sprayed steel plates or stainless steel plates on both sides, with a thickness of at least100 mm. The thermal insulation material is flame retardant and does not contain chlorofluorocarbons. It is allowed to add a certain proportion of reinforcing materials to improve the performance, but it cannot reduce the thermal insulation performance. 2.2 The inner and outer panels of the insulation board (1) are colored steel plates. (2) The coating of color steel plate must be non-toxic, tasteless and corrosion-resistant, and conform to international food hygiene standards. 2.3 Overall performance requirements of insulation board (1) No exposed insulation materials are allowed on the installation joint surface of insulation board, and no defects with convexity and concavity greater than 1.5mm are allowed on the joint surface. (2) The board surface of the insulation board shall be smooth and level, and there shall be no warping, scratches and uneven defects. (3) Strengthening measures are allowed in the insulation board to improve the mechanical strength, but it is not allowed to reduce the insulation effect. (4) The peripheral material of the heat insulation board must be the same high-density hard material as the heat insulation material, and other materials with high thermal conductivity are not allowed. (5) There should be measures to prevent cold bridge at the junction of thermal insulation wallboard and ground. (6) The joints between heat insulation boards shall be sealed with glass glue or other adhesive materials which are nontoxic, tasteless, free from volatilization of harmful substances, meet the requirements of food hygiene and have good sealing performance. (7) The connection structure between insulation boards shall ensure the pressure between joints and the firm connection at joints. 2.4 The installation of insulation board requires that the joint between the library board and the library board must be well sealed, the flat-fell seam between the two library boards should be less than 1.5mm, and the structure should be solid and reliable. After the splicing of the library body is completed, all joints of the library board should be coated with continuous and uniform sealant. The cross-sectional structures of various joints are as follows. Schematic diagram of warehouse splicing When the roof span exceeds 4m or the cold storage roof is load-bearing, the cold storage roof must be hoisted. The bolt position should be selected at the midpoint of the library board. In order to make the force of the library board as uniform as possible, aluminum alloy angle steel or mushroom cap must be used, as shown in the figure. 2.5 The sealing requirements of the joint of the thermal insulation board in the warehouse (1) shall ensure that the thermal insulation material of the wallboard at the joint between the wallboard and the ground is closely connected with the thermal insulation material in the floor, with reliable sealing and moistureproof. (2) The joints of the insulation boards are combined with on-site casting foam sealing. First, the insulation materials of the two insulation boards can be closely attached, and then the joint surface is evenly attached with sealant tape to eliminate the gaps and ensure the insulation materials are firmly bonded. (3) The sealing material at the joint of the insulation board itself should be anti-aging, corrosion-resistant, non-toxic, odor-free, free from volatilization of harmful substances, meet the requirements of food hygiene and have good sealing performance. The sealing material at the joint shall not be offset or displaced to ensure tight and uniform sealing at the joint. (4) When sealing the joint of insulation board with sealing strip, the joint size shall not be greater than 3 mm..(5) The insulation board of the warehouse must be integral along its height direction, and there is no horizontal middle joint. (6) The thickness of the ground insulation layer of the cold storage should be ≥100 mm ... (7) Measures must be taken to reduce the "cold bridge" effect of the lifting point structure on the warehouse ceiling, and the holes of the lifting point should be sealed. (8) The thermal conductivity of the lifting point material connected with the library board should be small, and the inner surface of the library should also be covered with a cover cap made of the same material. 3. Requirements of assembled cold storage for doors 1) Assembled cold storage is equipped with hinged doors, automatic single-side sliding doors and single-side sliding doors. 2) The thickness, surface layer and thermal insulation performance requirements of the refrigerated door are the same as those of the library board, and there should be no cold bridge in the structure of the door frame and door. 3) Electric heating or medium heating devices shall be embedded in the door frames of all low-temperature refrigerated doors to prevent the sealing strips of the doors from freezing. When electric heating is used, electric heating protection devices and safety measures shall be provided. 4) The doors of small-scale cold storage and freezer are manual horizontal doors, and the surface requirements of doors are the same as those of insulation boards. There should be no "cold bridge" in the door handle and door structure, and the opening of the door is greater than 90 degrees. 5) The door of the refrigerator is equipped with a lock, which has the function of safe unlocking. 6) The switches of all warehouse doors must be flexible and light, and the sealing contact surface between the door frame and the door itself must be smooth and level, and there must be no warping, burr or scraping caused by the skew and exposure of the screw end to ensure that the sealing strip can stick to the periphery of the door frame. 4. Annex 1 warehouse) low-temperature cold storage (warehouse temperature; Refrigeration load; Its corresponding evaporation temperature = temperature in the warehouse-TD; 3. If the cold storage can choose a cold fan with at least two fans, don't choose a cold fan with only one fan. In this way, when one fan is damaged and not replaced, the other fan can still maintain the cooling effect; 4. In general, the cooling fan fin spacing between the processing room and the cold storage room is 3 ~ 5 mm, and the cooling fan fin spacing of the cold storage room is 6 ~ 8mm；; 5. The refrigerating capacity of refrigeration unit should be ≥ 0.85, and its corresponding evaporation temperature should be 2 ~ 3℃ lower than that of air cooler (resistance loss must be considered).

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