Immersion Rapid Cooling Beverage Cabinet Cooling Theoretical Analysis And Experimental Research

With large quantities consumption of energy, developing energy-saving household or commercial appliances has become the development trend. Cold beverage demand is also growing year by year along with economic development, sales peak is often in short supply, therefore, in-depth study of cold beverage rapid cooling method and application is very important. Study cold beverage cabinet rapid cooling theory and develop equipment has profound significance to achieving sustainable development and energy saving.This paper studies the rapid cooling energy-saving effect of immersion rapid cooling beverage cabinet by combination of simulation and experimental. Analyzes theory thermodynamic cycle of immersion rapid cooling beverage cabinet refrigeration system and develops the equipment. Carries on the contrast experiment with conventional air-cooled beverage cabinet on cooling effects, verifying the economy of immersion test apparatus, puts forward the improved direction and provides a guideline for improving the performance of rapid cooling beverage cabinet.Establish a simulation model for the immersion rapid cooling beverage cabinet, using FLUENT software simulates and analyzes the main factors affecting rapid cooling effect.The paper sets cooling programs under a variety of conditions and predicts cooling time, correlation analysis is carried out on the simulation results. From the simulation results analyzes that secondary refrigerant flow velocity and temperature both have varying degrees of impact on beverage cooling effect, they have significant correlation. But compared to temperature, the flow velocity has more effect on beverage cooling rate.Combined with simulation results, experimental study is carried on for immersion rapid cooling beverage cabinet actual cooling. Test analyzes beverage internal temperature change with time,cooling rate and energy consumption in immersion cooling environment. When the thermostat setting at-3℃, all beverage inside cabinet temperature drop from 32℃ down to 6 ℃need 210min, while the thermostat setting at 3℃ need 140min. The experiment results show that at the same time and the same vertical section, the bottom of bottle has minimum temperature, the temperature at the top of bottle is maximum, the bottle center temperature is in the middle. The lower the secondary refrigerant temperature is the faster beverage cool, therefore, lower the secondary refrigerant temperature as much as possible under the condition of ensuring beverage do not freeze.Comparing the results of simulation and experiment show that the beverage center temperature trends over time are basically the same. The center temperature of No.9 bottle get to 6℃ need 122min measured in experiment, while simulation result is 102min,the error between experiment and simulation is 16.39%.There is an error because the drink is mixture, it contains a variety of additives which can affect or even change its properties in some way. so its physical property is too complex to determine. During the simulation do some ideal assumptions causing a certain gap with the actual situation.On the other hand, using conventional air-cooled cabinet to cool beverage as a contrast experiment. Comparing the cooling effect of different cooling methods then making energy- saving analysis, verifying the immersion beverage cabinet superiority and practicability.Under the same experimental conditions, measured all beverage dropped 6℃ consuming 20.3h with conventional air-cooled beverage cabinet, immersion rapid cooling beverage cabinet need 2.42h (Experiment Ⅱ-3℃ as the standard). Taking sales of 200 bottles a day for example, using conventional air-cooled beverage cabinet power consumption for 7.936kWh, immersion rapid cooling beverage cabinet (-3℃) power consumption for 4.56 kWh, an immersion rapid cooling beverage cabinet can save 3.376kWh electricity every day, calculated in this way, it can save energy 1232.24kW a year, its energy saving effect is remarkable.Through theoretical analysis and experimental studies also show that the cooling speed of the beverage closing to the evaporator is greater than the ones away from the evaporator, and the lower the secondary refrigerant temperature is the uniformity worse. To solve this problem, proposes improving suggestions:Shorten the length of the tank to reduce the amount of bottles; install evaporator and rotating turbine in the middle of the tank and put beverage in both sides of the tank, making fluid flow and heat transfer to both sides, it will improve the cooling effect of cold beverage cabinet.Providing a reference for the further study of liquid beverage rapid cooling.