Heat Pump Boiler Integration for Efficiency-Based Power Control
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Solution Overview
Problem
Heat pumps experience efficiency reduction and increased costs when outdoor temperatures drop, leading to inefficient heating of indoor spaces and hot water production, as they rely solely on electric heating, which can be more costly than gas heating in certain conditions.
Innovation Solution
A heat pump system that integrates a controller to dynamically manage the operation of both the heat pump and a boiler based on outdoor temperature, switching to boiler-assisted heating when efficiency drops below a predetermined threshold, and adjusting water flow from the boiler to optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the heat pump operates alone when outdoor temperature is high, then the system complexity is reduced, but the energy cost increases when electricity rates are greater than gas rates
Solution Approach 1:
The system dynamically switches between heat pump-only mode and boiler-assisted mode based on real-time conditions including outdoor temperature, efficiency thresholds, and energy rate comparisons. The controller adjusts the boiler power level continuously rather than using fixed modes, optimizing energy cost under varying electrical and gas rate conditions.
Solution Approach 2:
The system changes operational parameters (boiler power level, heat pump capacity) based on efficiency calculations and energy rate comparisons. When the heat pump's expected efficiency falls below a threshold or electricity rates exceed gas rates by a predetermined amount, the system transitions to boiler-assisted operation with adjusted power levels to minimize energy cost.
2Device complexity
If the heat pump operates alone without boiler assistance, then the device complexity is reduced, but the heating efficiency deteriorates when outdoor temperature drops below predetermined temperature
Solution Approach 1:
The system proactively introduces boiler assistance when outdoor temperature approaches predetermined thresholds or when efficiency predictions indicate upcoming performance degradation. The controller calculates expected efficiency based on temperature conditions and preemptively adjusts the system configuration to maintain optimal heating efficiency before efficiency actually drops.
Solution Approach 2:
The boiler acts as an intermediary heating source that supplements the heat pump when the heat pump alone cannot maintain efficient operation. The controller dynamically adjusts the boiler's power level to provide the necessary supplemental heating capacity while the heat pump continues to operate, optimizing the combination of both systems.
3Loss of energy
If the boiler is always on to ensure efficient heating, then the heating efficiency is maintained, but the energy cost increases due to continuous gas consumption
Solution Approach 1:
The system applies partial boiler action rather than continuous full-power operation. The controller dynamically adjusts the boiler power level to provide only the necessary supplemental capacity required to maintain efficient operation, avoiding excessive gas consumption. The boiler operates at optimized power levels based on real-time efficiency requirements and energy cost considerations.
Solution Approach 2:
The system continuously monitors outdoor temperature, heat pump efficiency, and energy rates, using this feedback to dynamically adjust boiler power levels. When efficiency requirements decrease or energy cost considerations change, the controller reduces or eliminates boiler operation, ensuring gas is consumed only when necessary to maintain optimal heating efficiency.
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 reduces energy costs by ensuring efficient heating and hot water production by leveraging the boiler when the heat pump's efficiency declines, maintaining optimal temperatures and minimizing energy consumption.
Implementation Method 1
The heat pump may be used to heat an indoor space (e.g., by heating indoor air) or to generate hot water, and heating of the air or water may occur through heat exchange of a refrigerant
Implementation Method 2
The outdoor unit may include a compressor and an outdoor heat exchanger
Data Source
AI summary
A heat pump may include a compressor configured to compress a refrigerant, a first temperature sensor configured to detect an outdoor temperature, a second temperature sensor provided in heating pipes connected to a heating device, and a controller. Based on a first sensing value of the first temperature sensor, the controller may be configured to control a compressor, control power to a boiler, and/or calculate an expected efficiency of the heat pump. Based on the expected efficiency and/or a second sensing value of a second temperature sensor, the controller may be configured to control power to the boiler.