Heat Pump Multi-Mode Operation for Simultaneous Heating and Cooling
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Solution Overview
Problem
Current HVAC&R systems lack the ability to efficiently operate in multiple modes, such as heating, cooling, and heat recovery, requiring separate units for different applications and lacking flexibility in handling varying heating and cooling demands across a range of ambient temperatures.
Innovation Solution
A refrigeration system with a compressor, condenser, evaporator, and outdoor coil configured to operate in multiple modes, utilizing valves, expansion devices, and a controller to determine and control the mode of operation based on set points and ambient conditions, allowing for simultaneous heating and cooling across a range of temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single HVAC&R system is designed to operate in multiple modes (heating, cooling, heat recovery), then the adaptability and versatility of the system is improved, but the device complexity increases due to multiple valves, expansion devices, and control mechanisms
Solution Approach 1:
The HVAC&R system is designed with a universal architecture that can perform multiple functions (heating, cooling, heat recovery) using the same core components (compressor, condenser, evaporator, outdoor coil). The system uses multiple expansion valves and flow control mechanisms to redirect refrigerant flow, enabling a single system to serve multiple purposes across different operating modes, thereby improving adaptability without requiring entirely separate systems for each function.
Solution Approach 2:
The system divides the refrigerant flow path into multiple controllable segments using expansion valves positioned at different locations (first expansion valve between condenser and outdoor coil, second expansion valve between outdoor coil and evaporator, third expansion valve between evaporator and compressor). This segmentation allows independent control of refrigerant flow through different components, enabling the system to switch between operating modes by selectively opening or closing specific valve paths, thus managing complexity through modular control.
2Reliability
If separate HVAC&R units are used for different applications (heating, cooling), then the reliability for each specific application is improved, but the loss of time and resources increases due to requiring multiple separate systems
Solution Approach 1:
The patent merges previously separate heating and cooling systems into a single integrated HVAC&R system. By combining the compressor, condenser, evaporator, and outdoor coil into one system with controllable refrigerant flow paths, the system can provide both heating and cooling functions through a unified architecture, reducing the need for multiple separate units and eliminating the time and resources required to install and maintain separate systems.
Solution Approach 2:
The system incorporates preliminary control mechanisms (multiple expansion valves and flow control devices) that are pre-configured to enable rapid switching between operating modes. The controller can determine the desired operating mode based on ambient conditions and load requirements, and the pre-positioned valves allow quick transition between heating, cooling, and heat recovery modes without requiring system reconfiguration or additional installation time.
3Ease of operation
If traditional HVAC&R systems operate in single mode, then the ease of operation is improved, but the adaptability to varying ambient temperatures and loads deteriorates
Solution Approach 1:
The system implements dynamic operation by using a controller that can determine and switch between multiple operating modes (heating, cooling, heat recovery) based on ambient temperature and load conditions. The expansion valves are dynamically controlled to adjust refrigerant flow rates, allowing the system to adapt to varying ambient temperatures and thermal loads while maintaining ease of operation through automatic mode selection and control.
Solution Approach 2:
The system incorporates feedback control mechanisms where the controller monitors ambient conditions and system performance, then adjusts the operating mode and valve positions accordingly. This feedback loop enables the system to automatically adapt to changing environmental conditions and load requirements, maintaining optimal performance across a wide temperature range while preserving ease of operation through automated control.
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 a single HVAC&R unit to support a range of simultaneous heating and cooling loads across varying ambient temperatures, providing improved flexibility and efficiency by determining and adjusting operation modes to meet specific demands.
Implementation Method 1
an evaporator disposed along the evaporator line and configured to vaporize a refrigerant to cool a first fluid stream
Implementation Method 2
a compressor system disposed along the compressor line and configured to compress the vaporized refrigerant
Implementation Method 3
a condenser disposed along the condenser line and configured to condense the refrigerant compressed by the compressor system to heat a second fluid stream
Implementation Method 4
configured to condense the refrigerant compressed by the compressor system to heat a second fluid stream
Implementation Method 5
an outdoor coil disposed along the coil line and configured to receive the refrigerant from the condenser or from the discharge line, to selectively transfer heat to or from the refrigerant
Data Source
AI summary
The present disclosure relates to a refrigeration system that includes an evaporator disposed along an evaporator line, a compressor system disposed along a compressor line, a condenser disposed along a condenser line and configured to condense the refrigerant compressed by the compressor system to heat a second fluid stream, and an outdoor coil disposed along a coil line and configured to receive the refrigerant from the condenser or from a discharge line, to selectively transfer heat to or from the refrigerant, and to selectively transfer the refrigerant to the evaporator or to a suction line. The refrigeration system includes two valves and three expansion valves disposed along the different refrigerant flow lines, and a controller configured to determine a simultaneous heating/cooling operating mode of the refrigeration system and to control the valves and expansion valves to operate the refrigeration system in the desired mode.