Multi-split HVAC system
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional HVAC systems face limitations in efficiently providing both heating and cooling, especially in large buildings where ductless systems lack backup heat and have poor air distribution during low ambient conditions, and they often require extensive installation costs and lack energy efficiency.
Innovation Solution
A multi-split HVAC system with variable refrigerant flow, modulating compressors, and electronically controlled expansion valves, along with a system controller for bidirectional communication, allows for flexible operation of indoor and outdoor units to maintain desired capacity and energy efficiency, incorporating multiple indoor units connected to a single outdoor unit and enabling heat recovery functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If ductless HVAC systems are used in large buildings, then installation costs are reduced and energy efficiency is improved, but backup heat capability is lost and air distribution becomes poor during low ambient conditions
Solution Approach 1:
The outdoor unit is designed to perform multiple functions: it can provide both cooling and heating operations, and can serve multiple indoor units simultaneously. The system can operate in different modes (cooling, heating, heat recovery) to address various thermal needs, making the HVAC system universally applicable for different operational requirements while maintaining energy efficiency.
Solution Approach 2:
The system employs variable refrigerant flow technology with modulating compressors that can adjust their operation across a wide range of conditions. The compressors can modulate their capacity to match the actual heating or cooling demand, allowing the system to maintain high energy efficiency while providing adequate heating capacity during low ambient conditions through parameter adjustment rather than fixed operation.
2Use of energy by moving object
If variable refrigerant flow with modulating compressors is implemented, then energy efficiency is enhanced and flexible operation is achieved, but device complexity increases
Solution Approach 1:
The system incorporates electronic expansion valves and modulating compressors with integrated control systems that automatically adjust refrigerant flow and compressor capacity based on actual system conditions and demand. The controllers autonomously manage the variable refrigerant flow distribution to multiple indoor units, eliminating the need for complex manual control systems while maintaining high energy efficiency through self-regulating operation.
3Ease of manufacture
If multiple indoor units are connected to a single outdoor unit, then installation costs are reduced and flexibility is improved, but refrigerant flow distribution becomes complex
Solution Approach 1:
The system uses variable refrigerant flow technology with electronic expansion valves at each indoor unit and modulating compressors that can dynamically adjust refrigerant distribution in real-time. This dynamic control system automatically balances refrigerant flow to multiple indoor units based on their individual cooling or heating demands, simplifying the overall system design while enabling flexible connection of multiple indoor units to a single outdoor unit with optimized installation costs.
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
This system enhances energy efficiency, addresses backup heat issues, reduces installation costs, and improves air distribution, qualifying for energy ratings and incentives by allowing flexible operation and heat recovery across zones.
Implementation Method 1
a compressor configured to compress refrigerant
Implementation Method 2
an outdoor fan configured to move air across the outdoor heat exchanger
Implementation Method 3
an outdoor heat exchanger configured to selectively provide heat transfer between refrigerant and air
Implementation Method 4
a first indoor fan configured to move air across the first indoor heat exchanger and a second indoor fan configured to move air across the second indoor heat exchanger
Implementation Method 5
a first indoor heat exchanger configured to selectively provide heat transfer between refrigerant and air and a second indoor heat exchanger configured to selectively provide heat transfer between refrigerant and air
Data Source
AI summary
A heating, ventilation, and/or air conditioning (HVAC) system has a first variable refrigerant flow outdoor unit, a first ducted variable speed indoor unit configured to selectively exchange refrigerant with the first variable refrigerant flow outdoor unit, and a second indoor unit configured to selectively exchange refrigerant with the first variable refrigerant flow outdoor unit.