Method for operating a variable-speed refrigerant compressor
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Solution Overview
Problem
Simple refrigeration systems without an electronic control unit that can communicate with the refrigerant compressor's control device face challenges in optimizing the rotational speed behavior of variable-speed refrigerant compressors, leading to suboptimal energy consumption due to lack of information about the refrigeration system's operating state.
Innovation Solution
Incorporating an additional temperature measurement independent of the cooling volume's temperature to adapt the predefined parameters of the closed-loop rotational speed control, allowing the electronic control device to adjust the rotational speed behavior based on ambient or operational conditions, thereby optimizing energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable-speed refrigerant compressors are used in simple refrigeration systems without electronic control units, then the compressor can still be operated cyclically with basic thermostat control, but the rotational speed behavior cannot be optimized leading to suboptimal energy consumption
Solution Approach 1:
The electronic control device of the refrigerant compressor autonomously determines its own rotational speed profile based on feedback from the actual cooling cycle duration and thermostat switching behavior, without requiring an external electronic control unit or communication infrastructure. The system serves itself by monitoring its own operational parameters and automatically adapting the rotational speed behavior to optimize energy consumption while maintaining compatibility with simple refrigeration systems.
2Device complexity
If the electronic control device autonomously controls rotational speed without communication from the refrigeration system, then the system remains simple and cost-effective, but the control precision and energy optimization are limited due to lack of system state information
Solution Approach 1:
The electronic control device implements a feedback mechanism by monitoring the actual duration of cooling cycles and the thermostat's switching behavior. This feedback information is used to determine the rotational speed profile for subsequent cooling cycles, enabling the system to adapt and optimize its operation based on actual performance data while maintaining system simplicity.
Solution Approach 2:
The electronic control device uses information from previous cooling cycles to pre-determine the rotational speed profile for upcoming cooling cycles. By analyzing the duration and characteristics of past cycles, the system prepares optimal speed profiles in advance, improving control precision without requiring real-time communication infrastructure.
3Device complexity
If the refrigerant compressor operates with fixed rotational speed profiles, then the control system remains simple, but the system cannot adapt to varying ambient conditions and thermal loads resulting in reduced energy efficiency
Solution Approach 1:
The rotational speed profile is transformed from a fixed, static parameter into a dynamic variable that automatically adjusts based on monitored cooling cycle characteristics. The electronic control device continuously adapts the rotational speed behavior by analyzing actual cycle durations and thermostat switching patterns, enabling the system to respond dynamically to varying ambient conditions and thermal loads while maintaining relatively simple control architecture.
Data Source
AI summary
The invention relates to a method for operating a variable-speed refrigerant compressor (2) for cooling a cooling volume (4) of a refrigeration system (1) that does not have its own control unit, wherein the refrigeration system (1) comprises at least one thermostat (3) for directly or indirectly monitoring a temperature state of the cooling volume (4) and wherein the rotational speed behavior of the refrigerant compressor (2) during a cooling cycle is controlled by means of a preset closed-loop rotational speed control saved in an electronic control device (6) of the refrigerant compressor (2), based on at least one predefined parameter, in that the at least one predefined parameter is monitored with respect to an over- and/or undershooting by a current parameter of a current cooling cycle, and relates to an electronic control device (6) for controlling the cyclical operation of a variable-speed refrigerant compressor. In order to enable an adaptation of the preset closed-loop rotational speed control performed by the electronic control device (6) of the refrigerant compressor (2) to the refrigeration system and/or ambient conditions, it is provided according to the invention that an additional temperature independent from the temperature of the cooling volume (4) is measured and the at least one predefined parameter is changed as a function of the additional temperature.