Heat Pump Controller for Adaptive Heating Demand Limits
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Solution Overview
Problem
Conventional heat pump systems experience undesirable fluctuations and shutdowns due to excessive heating % demand, leading to inconsistent heating performance and service calls, as they ramp up heating capacity by fixed percentages and shut down when maximum discharge pressure is exceeded.
Innovation Solution
A controller that operates the heat pump system in two modes: a normal limit mode and an extended limit mode, allowing the system to switch to a higher second maximum heating % demand when the target temperature is not met, gradually increasing the heating capacity to prevent shutdowns and maintain consistent heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heat pump system ramps up heating capacity by fixed percentages to meet target temperature, then the heating capability is improved, but the system experiences shutdowns when maximum discharge pressure is exceeded
Solution Approach 1:
The controller dynamically adjusts the maximum heating % demand based on operating conditions. Instead of using a fixed heating capacity ramp, the system switches between a first maximum heating % demand and a second, higher maximum heating % demand based on whether the target temperature is met, allowing adaptive response to changing conditions
Solution Approach 2:
The controller changes the operating parameters by switching between different maximum heating % demand values. When the target temperature is not met, the system transitions from a first maximum heating % demand to a second maximum heating % demand that is greater than the first, fundamentally changing the operational state to prevent shutdown
2Stability of the object's composition
If the heat pump system uses a first maximum heating % demand to operate, then the system operates stably, but the heating capability is insufficient to meet target temperature in extreme conditions
Solution Approach 1:
The controller dynamically switches between two operational modes: normal operation with a first maximum heating % demand and extended operation with a second, higher maximum heating % demand. This dynamic adjustment allows the system to maintain stability during normal conditions while achieving higher heating capability when needed to meet target temperatures in extreme conditions
Solution Approach 2:
The controller is designed to perform multiple functions: it manages normal operation with the first maximum heating % demand and also handles extreme conditions by switching to the second maximum heating % demand. This multi-functionality allows a single system to address both stable operation and high-demand scenarios
3Reliability
If the heat pump system gradually increases heating capacity, then the system avoids sudden trips, but the response time to meet target temperature is extended
Solution Approach 1:
The controller implements periodic monitoring of the target temperature and systematically switches between the first and second maximum heating % demands based on whether the temperature is met. This periodic action allows the system to gradually increase heating capacity in controlled steps, preventing sudden trips while maintaining reasonable response time
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
The controller's dual-mode operation reduces shutdowns and provides more uniform heating by allowing the heat pump to reach higher heating % demand ratios, avoiding sudden trips and maintaining consistent operation.
Implementation Method 1
During the winter, a HP system transfers heat from the outdoor air heat exchanger to an indoor heat exchanger where the heat is used to heat the interior of the residence or building
Implementation Method 2
outdoor fan/heat exchanger and compressor (OD) system
Data Source
AI summary
One aspect presents a controller that comprises a control board, a microprocessor located on and electrically coupled to the control board, and a memory coupled to the microprocessor and located on and electrically coupled to the control board. The controller is configured to receive an operating parameter signal and recalculate a first maximum heating % demand to a second maximum heating % demand that is greater than the first maximum heating % demand, when a value of the operating parameter signal exceeds a predetermined value, and operate the HP system based on the second maximum heating % demand.