Isothermal Box Refrigeration Diffusion Device
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Solution Overview
Problem
Existing refrigerated vehicles experience unsatisfactory cold air distribution within isothermal boxes, leading to temperature gradients that compromise the preservation of agri-food products during transport.
Innovation Solution
An insulated box design featuring a refrigeration diffusion device with a convergent nozzle, stabilization chute, and parallel guide profiles that ensures a continuous and progressive distribution of refrigerated air throughout the box, eliminating swirling currents and promoting uniform temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional refrigeration units are positioned on the front of the box with simple air intake ports, then the device complexity is reduced, but the temperature distribution becomes non-uniform with significant gradients throughout the container
Solution Approach 1:
The diffusion device segments the single air intake flow into multiple streams by introducing guide profiles that split and redirect the cold air flow across the container width, transforming one concentrated flow source into distributed flow paths that reduce temperature gradients
Solution Approach 2:
The diffusion device acts as an intermediary component between the refrigeration unit and the container interior, using guide profiles and stabilization chutes to condition and distribute the cold air flow before it enters the main container space, thereby improving temperature uniformity without modifying the refrigeration unit itself
2Productivity
If the container length is increased to 13 meters for logistics purposes, then the productivity and cargo capacity are improved, but the temperature gradient becomes more significant and detrimental to product preservation
Solution Approach 1:
The guide profiles extend the diffusion action along the longitudinal axis of the container, transforming a primarily transverse flow distribution into a three-dimensional distribution pattern that addresses temperature uniformity across the extended 13-meter length
Solution Approach 2:
The diffusion device performs preliminary flow conditioning and distribution before the cold air traverses the entire container length, pre-distributing the refrigerated air in a controlled manner to prevent the development of significant temperature gradients over the extended distance
3Use of energy by moving object
If refrigerated air is emitted directly into the container without stabilization, then the energy consumption is reduced, but the air flow becomes turbulent and creates swirling currents that prevent proper circulation
Solution Approach 1:
The stabilization chute serves as an intermediary flow conditioning element that receives turbulent air from the refrigeration unit and gradually conditions it into a more stable, laminar flow before distribution, reducing energy losses from turbulence while maintaining refrigeration efficiency
Solution Approach 2:
The guide profiles and stabilization chute modify the flow parameters (velocity distribution, turbulence intensity, flow direction) of the refrigerated air, transforming it from a turbulent state to a more controlled state that circulates effectively without excessive energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves optimized cooling with reduced energy consumption and uniform temperature distribution, preventing temperature gradients and ensuring the quality of perishable goods during transport.
Implementation Method 1
The diffusion device comprises a converging nozzle, a first guide profile and a second guide profile... The first guide profile and the second guide profile are positioned in the extension of said converging nozzle, to guide the flow of refrigerated air
Implementation Method 2
The distance between the two profiles allows cold air to emerge from the device over a continuous area. Thus, the chilled air emitted by the refrigeration unit is first guided by the converging nozzle and then continuously diffused along the entire length of the insulated container, while still being guided laterally by the two guide profiles... forming a single current between the diffusion device and the suction port
Implementation Method 3
The diffusion device may include a stabilizing channel interposed between the converging section and at least two profiles. The stabilizing channel may include at least two side walls and at least one bottom plate. The bottom plate may have a substantially rectangular, constant cross-section and may be adapted to make the refrigerated airflow tend to become laminar
Implementation Method 4
In the field of road logistics, certain products, particularly agri-food products, must be transported in so-called refrigerated vehicles which keep the products in the cold chain... the refrigeration generator connected to a refrigerated air intake port and an air suction port
Data Source
Figure 1~3
AI summary
Insulated box (100) substantially parallelepiped, comprising a lower wall (102), an upper wall (103), two side walls (102), a rear wall (105) and a front wall (104), said front wall (104) being adapted to support a refrigeration generator connected to a refrigerated air inlet (110) and an air outlet (111), said outlets (110) and (111) being provided in said front surface (104).The said insulated box (100) further comprises at least one refrigeration diffusion device (1) adapted to be fixed on the underside of said upper wall (103) comprising a converging nozzle (10), a first guide profile (35A) and a second guide profile (35A), the first guide profile (35A) and the second guide profile (35B) being parallel to each other and arranged at a distance from each other, the first guide profile (35A) and the second guide profile (35B) being positioned in the extension of said converging nozzle (10), to guide the flow of refrigerated air along the longitudinal axis of said insulated box (100).