In general, the cakes that are prepared must be kept in the refrigerator or in a refrigerated cake display cabinet. Although the cake at room temperature can be preserved for two to three days, the refrigerated cake can not only extend the shelf life to five to seven days, but also will be more delicious. The cabinet temperature of the refrigerated cake display cabinet is generally maintained between +2 and +8 degrees. At the same time, in order to keep the cake fresh and soft, the display cabinet of the cake must also control the humidity inside the cabinet to ensure that the humidity is 80-90. %between.
The refrigeration system of the cake display cabinet is not complicated. It is mainly composed of a compressor, a condenser, a capillary tube and an evaporator. The compressor is the heart of the cake display cabinet refrigeration system. Whether its choice is correct or not will directly affect the cooling performance of the entire display cabinet.
Danfoss has a full range of compressors for a variety of different refrigerants such as R22 R134a, R404A, R600a and R290. According to the application, Danfoss compressors can be divided into three types: high evaporation temperature (5 degrees ± 10 degrees), medium evaporation temperature (-10 degrees ± 10 degrees), and low evaporation temperature (-25 degrees ± 10 degrees). Application areas. At present, the domestic use of refrigerants in cake display cabinets is mainly based on traditional R22 refrigerants and environmentally friendly R134a refrigerants. The evaporating temperature of the refrigeration system is usually about -5 degrees to -10 degrees. This is a typical medium temperature application. Danfoss' SC10D, SC12D and SC15D compressors with R22 refrigerant and FR11G, SC10G, SC12G, SC15G, SC18G, SC21G and NL10MF with R134a refrigerant can meet this application requirement. Due to the limitation of the size of the domestic bakery, the length of the cake cabinet does not exceed 2.5 meters. The shortest time is also about 1 meter, so SC21G, SC18G, and SC15D are used in relatively small quantities. The larger models are SC10D, SC12D, FR11G, SC10G, SC12G, SC15G.
Danfoss SC series R134a refrigerant compressor is a universal compressor with high and low evaporation temperature. The evaporation temperature is from +15 degrees to -30 degrees, and the application range is very wide. And in the application of low evaporation temperature, it can also operate under 220V, 60hz power supply. Many refrigeration equipment manufacturers have noticed this feature of Danfoss compressors. When the products were exported to Southeast Asia, these 220V, 50HZ and 60HZ general-purpose compressors were selected. This not only takes into account the excellent performance of Danfoss compressors, but also equipment manufacturers have reduced a lot of work in preparing inventory and services. In addition, Danfoss compressors are designed for a temperature of 43 degrees Celsius. Working at a comfortable indoor temperature in a bakery, Danfoss compressors are more than adequate. Danfoss compressors are divided into high starting torque and low starting torque according to the starting mode. This is what we commonly call Capacitor Start (CSIR, CSR) and Start Without Capacitor (RSIR). With capacitor starting (CSIR, CSR) start torque in this way, in the CSR start mode, the motor efficiency can be improved, in the course of operation will be more power, of course, the cost has increased. The starting mode without capacitor start (RSIR) is simple in structure and reliable in operation. However, the starting current is large and it is suitable for places where the power source is strong. The Danfoss compressors currently used in the market are basically started with capacitors. Why should you choose this startup method? This is because the cake display cabinet is a kind of commercial refrigerator with higher requirements on the constant temperature of the cabinet. And glass seals are used around the cabinet. Although these glasses are also special heat-insulating glasses, the heat-insulating properties are slightly less than those of conventional foamed heat-insulating materials. Due to the constant opening of the door to take food, and other factors, the cake display cabinet will always have a certain amount of cold. Therefore, the number of compressor starts is relatively frequent; at the same time, due to the instability of the supply voltage in many places in China, these factors will cause certain difficulties for the start of the compressor. Therefore, we will require the user to select the start mode with capacitor start (CSIR, CSR) when using the compressor.
Danfoss compressors have extremely high reliability. Under the maximum load, the maximum allowable condensing temperature of R22 compressors can reach 60 degrees, and the maximum condensing temperature of R134a compressors can reach as high as 70 degrees. At the same time, a bimetal thermal protector is used inside the compressor. Although the environment in the bakery is relatively good, the condensing unit installed at the bottom of the cake display cabinet is not cleaned for a long time and the condenser inevitably accumulates dust. This is a great test for the compressor. Although Danfoss compressors are suitable for working under severe conditions, keeping the condenser clean is still a very important task.
Danfoss compressors are not only small, light weight, but also have very low noise levels and work at around 50 dB. In an elegant cake shop, you can hardly hear the noise of a Danfoss compressor. This is something that no other brand of compressor can achieve.
Cake display cabinet cooling system uses a fin condenser with axial fan. For more display space, cake display cabinets leave less and less room for installation of refrigeration systems. In some small display cases, many manufacturers have begun to make the condenser narrow shape to reduce the height of the condensing unit, and the condenser fan correspondingly uses a compact fan with a smaller size. The shutoff elements of the refrigeration system are capillaries (single or double parallel). The fin evaporator is installed below the display area. The cake display cabinet does not have a drain, and the condensate flowing from the evaporator flows to a water tray installed on the side of the compressor. The exhaust pipe of a compressor coated with a special material winds a few turns in the water tray to evaporate the water and enter the condenser. Because the cake display cabinet requires higher humidity, the fin spacing of the evaporator is larger. Some cake display cabinet manufacturers make two different sheet distances on the same evaporator to achieve better cooling effect. Due to the matching of the cooling system, many cake display cabinets cannot reach high humidity. At this time, a cup of water can be placed in the cake display cabinet to solve this problem. There are also some manufacturing plants that design the refrigeration system to set the evaporative stability of the refrigeration system to be lower or use a compressor with a low evaporating temperature. It is hoped that the temperature can be quickly reduced by lower blowing temperature to achieve the purpose of low temperature and high humidity. This practice actually reduces the efficiency of the compressor and also increases the risk of failure in the start-up and operation of the compressor.
Cake display cabinet This industry is mainly developed from Taiwan, Japan and Europe. Danfoss compressors in the high-end market are now replacing the common European brand compressors. But we also face the challenge of more brand compressors. We will uphold Danfoss's spirit of "art" and strive to meet the challenges. -->