Cascade Refrigeration Cooling Unit with Insulation-Coupled Intercooler
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Solution Overview
Problem
Existing multi-stage cascade refrigeration systems in cooling units suffer from low energy efficiency, slow cooling-down speeds, and pressure instabilities due to high temperature differences and direct cooling methods, leading to high installation costs and temperature fluctuations.
Innovation Solution
The cooling unit integrates a high-temperature evaporator and low-temperature condenser with an insulation system, allowing direct heat absorption from both the cooling compartment and ambient space through a thermally coupled heat collector, reducing energy consumption and stabilizing temperatures by utilizing the higher cooling capacity of the high-temperature refrigeration cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If direct cooling is provided only inside the cooling compartment, then the cooling unit can maintain the desired cooling temperature, but the cooling-down speed is slow and temperature instabilities occur frequently
Solution Approach 1:
The invention extends the cooling function from one dimension (cooling compartment only) to another dimension by thermally coupling the high-temperature evaporator to the insulation. This creates a two-dimensional cooling approach: (1) low-temperature evaporator cools the cooling compartment directly, and (2) high-temperature evaporator cools the insulation layer. This dimensional expansion enables faster heat removal and improved temperature stability without requiring system redesign.
2Temperature
If very low evaporation temperatures are required at the evaporator of the low-temperature refrigeration cycle, then the desired cooling temperature can be achieved, but the cooling capacity is limited and energy efficiency is low
Solution Approach 1:
The invention segments the cooling function into two independent refrigeration cycles with distinct temperature ranges. The low-temperature refrigeration cycle (operating at very low evaporation temperatures) is responsible only for cooling the cooling compartment, while the high-temperature refrigeration cycle (operating at higher evaporation temperatures with better energy efficiency) cools the insulation layer. This segmentation allows each cycle to operate in its optimal efficiency range, eliminating the energy efficiency penalty that would result from operating a single cycle at very low temperatures.
Solution Approach 2:
The invention applies local quality by assigning different cooling functions to different parts of the system. The low-temperature evaporator provides intensive cooling where it is most needed (cooling compartment), while the high-temperature evaporator provides preventive cooling where it is most efficient (insulation layer). This localized approach optimizes energy efficiency by matching each evaporator's operating characteristics to its specific cooling task.
3Temperature
If a multi-stage cascade refrigeration system is used to cool down the cooling compartment to very low temperatures, then the desired cooling temperature can be maintained, but pressure peaks occur inside the refrigeration cycles causing instabilities
Solution Approach 1:
The invention segments the pressure management function across two independent refrigeration cycles. By separating the cooling tasks into two cycles operating at different temperature levels, each cycle experiences smaller and more manageable pressure variations. The high-temperature cycle operating at milder conditions experiences less severe pressure peaks than a single low-temperature cycle would, thereby improving overall system stability while maintaining the ability to achieve very low cooling temperatures.
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 enhances energy efficiency by 15% and improves cooling-down speed while reducing pressure peaks and temperature fluctuations, enabling stable temperature maintenance in the cooling compartment.
Implementation Method 1
a low-temperature evaporator arranged to absorb heat from the cooling compartment
Implementation Method 2
a high-temperature condenser arranged to reject heat to the ambient space
Implementation Method 3
a high-temperature evaporator of the high-temperature refrigeration cycle is thermally coupled to a low-temperature condenser of the low-temperature refrigeration cycle in order to form an intercooler
Implementation Method 4
an insulation separating the cooling compartment from an ambient space
Data Source
AI summary
The invention relates to a cooling unit for storing temperature-sensitive goods at a desired cooling temperature, comprising a cooling compartment (9) for storing the temperature-sensitive goods, an insulation (1) separating the cooling compartment (9) from an ambient space (10), a multi-stage cascade refrigeration system adapted to cool down the cooling compartment (9) to the desired cooling temperature and/or maintain the desired cooling temperature in the cooling compartment (9), said multi-stage cascade refrigeration system comprising at least a high-temperature refrigeration cycle (11) and a low-temperature refrigeration cycle (12), whereas said low-temperature refrigeration cycle (12) comprises a low-temperature evaporator (13) arranged to absorb heat from the cooling compartment (9), and whereas the high-temperature refrigeration cycle (11) comprises a high-temperature condenser (14) arranged to reject heat to the ambient space (10), whereas a high-temperature evaporator (3) of the high-temperature refrigeration cycle (11) is thermally coupled to a low-temperature condenser (4) of the low-temperature refrigeration cycle (12) in order to form an intercooler, whereas said high-temperature evaporator (3) and/or said low-temperature condenser (4) are/is thermally coupled to the insulation (1).