Method for operating a heat pump device
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Solution Overview
Problem
Heat pump devices experience reduced service life and efficiency due to frequent switching and heat losses, particularly when components are not optimally matched, leading to repeated heating cycles and decreased coefficient of performance (COP).
Innovation Solution
A method for operating a heat pump device with a variable minimum temperature that adjusts based on elapsed time since previous heating, allowing for extended periods between heating cycles while maintaining comfort requirements, by starting at a default temperature of 40°C and increasing to a target temperature of 56°C within 6 hours, adaptable to various component combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat pump device uses a constant minimum temperature threshold for heating activation, then the control is simple and reliable, but frequent short heating cycles occur which reduce service life and efficiency
Solution Approach 1:
The patent applies dynamics by making the minimum temperature threshold variable instead of constant. The threshold dynamically adjusts based on the elapsed time since the last heating operation, transforming a static control parameter into a dynamic one that adapts to system conditions and reduces frequent cycling.
Solution Approach 2:
The patent implements preliminary action by pre-defining multiple temperature thresholds corresponding to different time intervals. Before actual operation, the system determines which threshold to use based on the time elapsed since the last heating, allowing the control strategy to be prepared in advance rather than reacting to each temperature drop independently.
2Reliability
If the heat pump device heats water to target temperature every time the minimum threshold is reached, then the fluid temperature requirement is always met, but the heat pump starts and stops frequently reducing coefficient of performance
Solution Approach 1:
The patent applies parameter changes by modifying the minimum temperature threshold parameter based on the time elapsed since the last heating operation. Instead of using a single fixed threshold, the system changes the threshold parameter dynamically (or semi-dynamically with pre-defined values), allowing longer intervals between heating operations and reducing the frequency of start-stop cycles.
3Ease of operation
If the heat pump device operates with a fixed temperature threshold, then the control logic is simple, but components with suboptimal insulation or mismatched volumes cause frequent threshold violations
Solution Approach 1:
The patent transforms the static minimum temperature threshold into a dynamic one that adapts to different system configurations and time intervals. This dynamic approach allows the control system to accommodate variations in insulation quality and tank-volume mismatches without requiring complex real-time calculations, maintaining operational simplicity while improving reliability.
Solution Approach 2:
The system performs preliminary determination of the appropriate temperature threshold based on pre-defined time intervals before actual heating operations begin. This pre-calculation approach simplifies the control logic during operation while still adapting to different system conditions, avoiding the need for complex real-time decision-making.
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 approach significantly reduces the number of heat pump activations, thereby extending the service life and improving efficiency, ensuring maximum functional reliability and comfort by optimizing temperature control according to the specific heat pump and fluid storage system configuration.
Implementation Method 1
the temperature of the fluid is detected by a sensor device, in particular a temperature sensor
Implementation Method 2
the fluid is heated to a value above the minimum value, in particular to the target temperature
Data Source
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AI summary
The method involves detecting temperature of fluid i.e. water, by using a temperature sensor (4), where the fluid is stored in a fluid reservoir (2). The fluid is heated to predeterminable reference temperature value by a heating device (6). The fluid is heated to a temperature value that is above a minimum temperature value when the temperature of the fluid is lowered or when the temperature value of the fluid is below a minimum temperature value i.e. 64 degree Celsius, which is variable and depends on a time elapsed a previous heating period.