Heat Pump with Shared Expansion Valve for Multi-Mode Water Heating
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Solution Overview
Problem
Conventional heat pump systems lack the capability to efficiently provide both air-conditioning and hot water in residential applications, with limited operational modes and energy efficiency, especially at lower temperatures.
Innovation Solution
A heat pump system incorporating a first, second, and third heat exchanger, with an expansion valve shared between them, and an enhanced vapor injection component, allowing for six operation modes including cooling, heating, water-heating, and simultaneous heating and water-heating, while utilizing a four-way valve to control refrigerant flow and achieve efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional heat pump systems are used, then simple operation and limited components are maintained, but the capability to efficiently provide both air-conditioning and hot water is lacking
Solution Approach 1:
The heat pump system is designed to perform multiple functions including air-conditioning, heating, and hot water supply through a unified system architecture. The first and second heat exchangers can operate in different modes (cooling or heating) while the third heat exchanger is dedicated to hot water supply, allowing the system to provide both air-conditioning and hot water efficiently without requiring separate systems
Solution Approach 2:
The system merges multiple heat exchangers (first, second, and third) and a shared expansion valve into a single integrated system. The expansion valve is shared between the first, second, and third heat exchangers, reducing component count while enabling versatile operation modes including simultaneous heating and water heating
2Temperature
If conventional heat pump systems operate at lower temperatures, then operational range is limited, but energy efficiency decreases significantly
Solution Approach 1:
The system employs parameter changes by adjusting refrigerant flow distribution to different heat exchangers based on operating conditions. The four-way valve and expansion valves dynamically control refrigerant flow paths, allowing the system to adapt to lower temperature conditions while maintaining energy efficiency through optimized heat exchange parameters
3Adaptability or versatility
If multiple operation modes are implemented, then system versatility is improved, but control complexity increases
Solution Approach 1:
The system uses a four-way valve as an intermediary component to control refrigerant flow distribution to different heat exchangers. This single intermediary device enables multiple operation modes (cooling, heating, hot water supply, simultaneous heating and water heating) by redirecting refrigerant flow paths without requiring complex control mechanisms for each mode
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 effectively provides chilled or hot water for air-conditioning and heating, operating efficiently down to -15°C and increasing hot water outlet temperature to 65°C, enhancing energy efficiency and environmental friendliness.
Implementation Method 1
a first heat exchanger, a second heat exchanger and a third heat exchanger (e.g., a hot-water heat exchanger)
Implementation Method 2
At least one expansion valve can be disposed at a downstream position of the hot-water heat exchanger and between the hot-water heat exchanger and the first and second heat exchangers
Implementation Method 3
compressed refrigerant from a compressor
Data Source
AI summary
Heat pump systems and methods for providing chilled/hot liquid for air-conditioning and domestic hot-water, are provided. The heat pump systems include a first heat exchanger, a second heat exchanger and a third heat exchanger (e.g., a hot-water heat exchanger) that share at least one expansion valve disposed at a downstream position of the hot-water heat exchanger. The at least one expansion valve is disposed between the hot-water heat exchanger and the first and second heat exchangers. The heat pump systems can provide six operation modes, including a cooling mode, a heating mode, a water-heating mode, a heat-recovery mode, a simultaneous heating and water heating mode, and a defrost mode.