Heat Medium Relay Unit Layout for Compact, Serviceable HVAC Piping
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Solution Overview
Problem
Conventional air-conditioning systems for multi-story buildings face issues with refrigerant leakage, energy inefficiency due to long heat medium circulation paths, complex and expensive piping configurations, and reduced serviceability, particularly in compact spaces like above ceilings.
Innovation Solution
A heat medium relay unit with a simplified piping configuration, featuring detachable heat medium delivering and flow control devices housed in a compact unit, allowing for easy maintenance and energy-efficient operation by optimizing the circulation of heat medium between outdoor and indoor units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If refrigerant circulates through indoor units, then cooling and heating functions are achieved, but refrigerant leakage risk increases
Solution Approach 1:
The system divides the refrigerant circulation into two separate loops: a primary refrigerant loop confined to the outdoor unit, and a secondary heat medium loop distributed to indoor units. This segmentation isolates the refrigerant to a controlled area, eliminating leakage risks in living spaces while maintaining cooling and heating functions through the heat medium that circulates in the secondary loop.
Solution Approach 2:
A heat medium (water or antifreeze solution) acts as an intermediary between the refrigerant and the indoor units. The refrigerant heats or cools this heat medium in the outdoor unit, and the heat medium then transfers thermal energy to indoor units through heat exchangers. This intermediary approach enables thermal energy transmission without requiring refrigerant presence in indoor units.
2Ease of manufacture
If heat medium circulation path is extended to reach indoor units, then heating and cooling functions are provided, but energy consumption increases
Solution Approach 1:
The system strategically positions the heat medium relay unit in a three-dimensional space above the ceiling, utilizing vertical space rather than horizontal extension. This dimensional approach shortens the horizontal circulation path while still reaching indoor units through optimized piping routes, thereby reducing conveyance power requirements.
Solution Approach 2:
The heat medium relay unit pre-cools or pre-heats the heat medium before it circulates to indoor units. By performing preliminary thermal processing in the outdoor unit area, the system reduces the thermal gradient required during circulation, minimizing energy losses and conveyance power consumption over extended distances.
3Adaptability or versatility
If multiple pipes connect outdoor unit with each indoor unit for simultaneous cooling and heating, then arbitrary temperature selection is enabled, but piping complexity increases
Solution Approach 1:
The heat medium relay unit implements a universal two-pipe configuration that serves both cooling and heating functions for all indoor units. By using the same pipe infrastructure for dual purposes and implementing flow direction control at the relay unit, the system achieves temperature selection flexibility without requiring separate dedicated pipes for each function, thereby reducing overall piping complexity.
Solution Approach 2:
The system merges cooling and heating pipelines into a single integrated two-pipe configuration. Both cooling water and heating water circulate through the same pipe network, with flow direction and temperature control managed centrally at the heat medium relay unit. This consolidation reduces the number of pipes required compared to separate dedicated systems.
4Volume of moving object
If heat medium relay unit is installed in compact spaces like above ceilings, then space utilization is improved, but serviceability deteriorates
Solution Approach 1:
The heat medium relay unit is designed as a segmented, modular assembly with distinct functional sections (heat exchangers, pumps, valves, control units) that can be independently accessed and serviced. This segmentation allows maintenance personnel to work on specific components without disassembling the entire unit, significantly improving serviceability in confined ceiling spaces.
Solution Approach 2:
The relay unit incorporates detachable components and flexible piping connections that enable dynamic access to internal parts. Service panels and removable covers allow maintenance personnel to reach critical components from limited access points in ceiling spaces, transforming a static enclosed unit into a dynamically accessible system.
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 solution enhances serviceability, reduces energy consumption, and improves piping efficiency, ensuring effective heating and cooling while minimizing refrigerant leakage risks and maintenance complexities.
Implementation Method 1
a heat exchanger provided in an outdoor unit heats or cools water, antifreeze, or the like
Data Source
AI summary
A heat medium relay unit and an air-conditioning apparatus or the like are provided that are compact and have improved serviceability while achieving energy saving. A heat medium relay unit according to the invention includes heat medium delivering devices and heat medium flow switching devices (first heat medium flow switching devices and second heat medium flow switching devices) that are provided so as to be detachable from a predetermined side.