Brushless DC Motor Compressor Refrigeration for Variable-Load Cooling
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Solution Overview
Problem
Conventional refrigeration systems for temperature-controlled display devices face issues such as lack of variable capacity, energy inefficiency, and excessive noise, along with challenges like expensive field piping, large refrigerant charge, leakage, and parasitic heating due to remotely located compressor systems.
Innovation Solution
A refrigeration system utilizing a brushless DC motor-driven compressor with a refrigeration circuit, cooling circuit, and reclaim heat circuit, where the compressor operates at multiple speeds to accommodate varying thermal loads, and an auxiliary heating system is integrated to manage heat transfer efficiently, using a controller to modulate the speed of the motor and adjust fluid flow to maintain desired temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional compressors are used in refrigeration systems, then the system can provide basic cooling function, but the system suffers from energy inefficiency, excessive noise, and lack of variable capacity
Solution Approach 1:
The patent replaces conventional mechanical compressors with an electromagnetic compressor driven by a brushless DC motor. This substitution eliminates mechanical contacts, reduces noise, improves energy efficiency, and enhances reliability through electronic control. The electromagnetic compressor uses electromagnetic fields to drive the compression process, replacing traditional mechanical linkages and reducing maintenance requirements.
Solution Approach 2:
The patent implements variable capacity control by dynamically adjusting the speed of the brushless DC motor driving the compressor. The motor can operate at multiple speeds (e.g., high, medium, low) to match varying thermal loads, optimizing energy efficiency while maintaining reliable operation across different operating conditions.
2Adaptability or versatility
If remotely located compressor systems are used, then the refrigeration system can be distributed, but the system incurs expensive field piping, large refrigerant charge, and parasitic heating
Solution Approach 1:
The patent integrates the compressor, condenser, and evaporator into a single self-contained refrigeration unit. This merging of components eliminates the need for extensive field piping and reduces the total refrigerant charge required, while maintaining the flexibility of distributed refrigeration systems through modular design.
Solution Approach 2:
The self-contained refrigeration unit is designed as a universal module that can be installed in various locations and configurations. The integrated design allows the unit to function independently, reducing dependency on centralized systems and minimizing refrigerant piping requirements while adapting to different installation environments.
3Adaptability or versatility
If conventional compressors without variable speed are used, then the system structure is simple, but the system cannot adapt to varying thermal loads efficiently
Solution Approach 1:
The patent employs a brushless DC motor with variable speed capability to drive the compressor, enabling the system to adapt to varying thermal loads. The motor controller adjusts the motor speed based on temperature sensors and load conditions, optimizing cooling performance while managing the complexity through electronic control algorithms.
4Productivity
If centralized parallel compressor systems are used, then the system can serve multiple display cases, but the system requires expensive field piping and creates parasitic heating
Solution Approach 1:
The patent divides the refrigeration system into multiple self-contained modular units, each with its own compressor and refrigeration circuit. This segmentation eliminates the need for centralized parallel compressor systems and extensive piping, reducing parasitic heating in liquid and suction lines while maintaining high cooling capacity through distributed cooling.
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 solution enhances energy efficiency, reduces operational costs, and improves reliability by allowing the compressor to adapt to different thermal loads while effectively managing heat transfer and reducing noise, thus overcoming the limitations of conventional systems.
Implementation Method 1
a variable-speed brushless DC motor. The compressor, the heat exchanger, the expansion device, and the cooling element are in fluid communication via the working fluid
Implementation Method 2
a first heat exchanger, an expansion device, and a cooling unit in fluid communication via a first working fluid. The cooling unit is arranged to cool a temperature-controlled storage device
Implementation Method 3
The compressor is driven by the variable-speed brushless DC motor. The compressor circulates a working fluid through the refrigeration circuit
Data Source
AI summary
The present disclosure generally relates refrigeration systems for temperature-controlled displays. For instance, one exemplary embodiment relates to a refrigeration system that includes a refrigeration circuit, a cooling circuit, a reclaim heat circuit, and a floor heating system. The refrigeration circuit includes a compressor driven by a brushless DC motor operable at multiple different speeds, a first heat exchanger, an expansion device, and a cooling unit in fluid communication using a first working fluid. The cooling unit is arranged to cool a temperature-controlled storage device. The cooling circuit includes a pump and a second heat exchanger in thermal communication with the first heat exchanger using a second working fluid such that the first heat exchanger is liquid-cooled by the second working fluid. The reclaim heat circuit is in fluid communication with the cooling circuit. The floor heating system is coupled to the heat reclaim circuit as a reclaim heat load.