Integrated Heat Pump Water-Heating Circuit for Compressor Load Control
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Solution Overview
Problem
Modern space heating and cooling systems are becoming more energy-efficient, but domestic water heating remains a significant energy consumer, and existing systems face challenges in managing excessive refrigerant load during water heating, which can lead to compressor overload.
Innovation Solution
A refrigeration circuit with four modes of operation (space cooling, space heating, water heating, and simultaneous space cooling and water heating) that includes a variable capacity compressor and a control system to monitor and adjust compressor speed based on pressure differential, along with a valve assembly to direct refrigerant flow efficiently between heat exchangers, minimizing the number of valves required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the heat pump system operates in water heating mode, then water heating function is provided, but the compressor may become overloaded due to excessive refrigerant load
Solution Approach 1:
The system employs a variable speed compressor that can dynamically adjust its operating speed based on system conditions. During water heating mode, the compressor speed is reduced to prevent overload while maintaining adequate refrigerant circulation. This dynamic speed adjustment allows the single compressor to reliably handle multiple operating modes including space cooling, space heating, and water heating without exceeding its capacity limits.
Solution Approach 2:
The patent implements a universal heat pump system where a single compressor and refrigerant circuit serve multiple functions: space cooling, space heating, and water heating. By designing the system with multi-functionality, the same core components are utilized across different operating modes, reducing the need for separate dedicated equipment while managing refrigerant load through intelligent control strategies.
2Use of energy by moving object
If a single integrated heat pump system is used for both space conditioning and water heating, then energy economy is improved, but the system complexity increases
Solution Approach 1:
The system merges space conditioning and water heating functions into a single integrated heat pump system. The refrigerant circuit is configured to serve both space heat exchangers and water heat exchangers, allowing waste heat from space cooling to be utilized for water heating and vice versa. This merging approach improves energy economy by eliminating separate equipment while the control system manages the increased complexity through automated mode selection and refrigerant flow distribution.
Solution Approach 2:
The patent introduces a control system as an intermediary that manages the complexity of the integrated system. This control system monitors system conditions, selects appropriate operating modes, and directs refrigerant flow to the appropriate heat exchangers. By placing this intelligent mediator in charge, the system can handle multiple functions and operating modes without requiring complex manual intervention or overly complicated hardware configurations.
3Productivity
If the compressor speed is increased to handle water heating load, then refrigerant circulation is improved, but energy consumption increases
Solution Approach 1:
The variable speed compressor dynamically adjusts its operating speed based on the specific operating mode and system conditions. During water heating mode, the compressor operates at a reduced speed compared to space cooling mode, as water heating requires less refrigerant circulation. This dynamic speed adjustment maintains adequate refrigerant flow for effective heat transfer while minimizing compressor energy consumption, avoiding the need to run at maximum speed in all conditions.
Solution Approach 2:
The system changes the operating parameters of the compressor based on the operating mode. In water heating mode, the compressor speed parameter is reduced, and the refrigerant flow distribution parameters are adjusted to prioritize water heat exchanger performance. This parameter optimization ensures that the compressor operates efficiently for each specific function, matching its output to the actual refrigerant load requirements of water heating rather than maintaining high-speed operation unnecessarily.
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 system achieves increased energy economy by utilizing waste heat for water heating and effectively managing refrigerant load, reducing energy consumption and extending the operational range of heat exchange components.
Implementation Method 1
a plurality of heat exchangers including a water supply heat exchanger, a source heat exchanger, and a space heat exchanger
Implementation Method 2
a compressor having an inlet on a suction side and an outlet on a discharge side
Data Source
AI summary
An integrated heat pump and water heating circuit for space heating and cooling and heating domestic water. The circuit includes a first heat exchanger for the domestic water, a second heat exchanger for the source, a third exchanger for the space, and a variable capacity compressor. The circuit has four modes of operation. In the first mode, the space is cooled. In the second mode, the space is heated. In the third mode, the circuit heats the water supply. In a fourth mode, the water supply is heated and the space is cooled simultaneously. The speed of the compressor is adjusted to maintain a pressure differential at or above a predetermined set point.