Multi-Source Heat Pump Valve Control for Ground Conditioning
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Solution Overview
Problem
Existing heat pump systems typically operate in only two modes, heating or cooling, and their efficiency depends on the temperature differential between the building and the ground, limiting their versatility and operational efficiency.
Innovation Solution
A multi-source heat pump system that dynamically optimizes the selection of fluid sources and heat exchange zones, allowing operation in at least five different heating and cooling modes by using air, ground, and solar thermal sources, with valve sets controlling the flow of heat exchange fluid between the heat pump unit, ground heat exchanger, and ambient atmosphere.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a heat pump system operates in only two modes (heating or cooling) using ground as the sole heat source/sink, then the system structure remains simple, but the operational efficiency and versatility are limited
Solution Approach 1:
The heat pump system is designed to perform multiple functions by integrating both ground source heat exchange and air source heat exchange capabilities. The system can operate in heating mode, cooling mode, and ground conditioning mode, allowing a single system to serve multiple purposes and adapt to different environmental conditions and building needs.
Solution Approach 2:
The system incorporates dynamic control through valve sets that can selectively connect different components based on operational requirements. The first valve set controls the input side to switch between ground heat exchanger and ambient air, while the second valve set controls the output side to direct conditioned fluid to appropriate destinations, enabling flexible adaptation to changing conditions.
2Use of energy by moving object
If the system uses ground as the primary heat source/sink, then the system is simpler to implement, but the efficiency is limited by temperature differential between building and ground
Solution Approach 1:
The system introduces ambient air as an intermediary heat source or sink that can be utilized when ground heat exchange becomes less efficient. This additional thermal pathway allows the system to maintain high efficiency operation by selecting the most favorable heat source or sink based on current temperature differentials and building requirements.
Solution Approach 2:
The system dynamically changes operational parameters by switching between different heat source configurations. The controller monitors environmental conditions and adjusts the system's thermal pathways, selecting between ground-coupled and air-coupled operation to optimize the temperature differential and maintain peak efficiency under varying conditions.
3Productivity
If the system operates without ground conditioning, then the operation is simpler, but the ground heat exchanger accumulates heat over time reducing system efficiency
Solution Approach 1:
The system implements periodic ground conditioning cycles where the heat pump alternates between serving building loads and conditioning the ground heat exchanger. During off-peak times or when building loads are low, the system directs heat exchange operations to recharge or balance the ground thermal energy, preventing heat accumulation and maintaining optimal ground temperatures for sustained efficiency.
Solution Approach 2:
The ground heat exchanger is integrated into the system as a self-conditioning component. The heat pump unit automatically manages the thermal state of the ground exchanger by directing excess heat away or extracting heat as needed, allowing the ground system to self-regulate its thermal conditions without external intervention, thereby maintaining long-term operational efficiency.
4Adaptability or versatility
If the system integrates multiple heat sources and cooling zones, then the versatility and efficiency are improved, but the device complexity increases
Solution Approach 1:
The control system is segmented into distinct functional modules: a first valve set for controlling input pathways, a second valve set for controlling output pathways, and a controller that manages coordination between them. This modular segmentation allows each component to perform its specific function independently, simplifying the overall control architecture despite the multiple operating modes and heat sources available.
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
Enables more efficient operation by optimizing mode selection based on environmental conditions, allowing for better integration with other HVAC equipment and reducing the volume and cost of ground heat exchange systems, while extending the system's operational lifespan by conditioning the ground heat exchanger.
Implementation Method 1
The heat pump unit operates upon a heat exchange fluid, wherein the heat exchange fluid passes into the heat pump unit through an input port and exits the heat pump unit through an exit port. The heat exchange fluid is changed in temperature by the heat pump unit.
Implementation Method 2
A ground heat exchanger is thermally coupled to the ground under or around the building to be conditioned.
Implementation Method 3
The first valve set can selectively interconnect the input port of the heat pump to the fluid output of the ground heat exchanger, or to the ambient atmosphere. The second valve set can selectively interconnect the output port of the heat pump to the fluid input of the ground heat exchanger or to the ambient atmosphere.
Data Source
AI summary
A heat pump system having a heat pump unit that operates upon a heat exchange fluid. A ground heat exchanger and an ambient heat exchanger are provided. A first valve set is coupled to the heat pump unit, the ground heat exchanger and the ambient heat exchanger. The first valve set can interconnect the input of the heat pump to the ground heat exchanger or to the ambient heat exchanger. The first valve set can also interconnect the ground heat exchanger to the ambient heat exchanger. A second valve set is provided that interconnects the output of the heat pump unit to the ground heat exchanger or to the ambient heat exchanger. The second valve set can also interconnect the ground heat exchanger to the ambient heat exchanger. The multiple modes are offered by the first valve set and the second valve set.