Multi-Split Air Conditioning Heat Exchange Allocation by Pressure Drop
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Solution Overview
Problem
Existing methods for calculating the heat exchange amount in multi-connected air conditioning systems cannot separately calculate the heat exchange amount of each indoor unit in air-cooled systems, as they rely on temperature changes and are not applicable to air-cooled systems.
Innovation Solution
A method that calculates the heat exchange amount of each indoor unit in a multi-connected air conditioning system by using pressure measurement points, pipe diameter, friction factor, and density of the heat exchange medium, along with the total system heat exchange amount, to determine the flow rate and proportionally allocate the heat exchange amount to each unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If temperature change measurement method is used to calculate heat exchange amount, then calculation can be realized for water-cooled systems, but it cannot be applied to air-cooled multi-connected systems
Solution Approach 1:
The patent changes the measurement parameter from temperature change (ΔT) to pressure difference (ΔP). By measuring pressure differences at two points in the air pipe and using the Darcy-Weisbach equation, the system calculates heat exchange amount for air-cooled systems without relying on temperature measurements, thus resolving the inapplicability of existing methods to air-cooled multi-connected systems
Solution Approach 2:
The patent replaces the thermal measurement approach (temperature-based) with a mechanical measurement approach (pressure-based). By substituting temperature sensors with pressure sensors and using fluid mechanics principles (Darcy-Weisbach equation), the system achieves heat exchange calculation for air-cooled systems where temperature measurement methods fail
2Ease of operation
If separate monitoring of each indoor unit is implemented, then user management capability is improved, but existing methods cannot provide separate calculation for air-cooled systems
Solution Approach 1:
The patent changes the fundamental measurement parameter from temperature to pressure, enabling separate heat exchange calculation for each indoor unit in air-cooled multi-connected systems. By measuring pressure differences individually at each indoor unit's air pipe and applying the Darcy-Weisbach equation, the system provides separate monitoring capability that was previously unavailable for air-cooled configurations
Solution Approach 2:
The patent creates a universal calculation method that works for both water-cooled and air-cooled multi-connected systems. The pressure-based approach using Darcy-Weisbach equation serves as a universal solution that maintains the separate monitoring capability for user management while adapting to different system types, eliminating the need for different calculation methods for different cooling types
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 separate monitoring and management of each indoor unit's heat exchange amount in air-cooled multi-connected air conditioning systems, improving accuracy and overcoming difficulties in measuring gas flow, thereby enhancing operational efficiency.
Implementation Method 1
obtaining a pressure difference between two pressure measurement points on each of the air pipes
Implementation Method 2
calculating a flow rate of the heat exchange medium in each of the air pipes according to the pressure difference between the two pressure measurement points on each of the air pipes, a distance between the two pressure measurement points on each of the air pipes, a pipe diameter of each of the air pipes, a friction factor of each of the air pipes, and a density of the heat exchange medium
Data Source
AI summary
A multi-split air-conditioning system, and a method for calculating a heat exchange capacity thereof. The method includes: acquiring a total heat exchange capacity of a multi-split air-conditioning system; acquiring a pressure difference between two pressure measurement points on each air pipe; acquiring the distance between the two pressure measurement points on each air pipe; acquiring the pipe diameter of each air pipe; acquiring the friction factor of each air pipe; acquiring the density of a heat exchange medium in each air pipe; and according to the total heat exchange capacity of the multi-split air-conditioning system, the pressure difference and distance between the two pressure measurement points on each air pipe, the pipe diameter and friction factor of each air pipe, and the density of the heat exchange medium in each air pipe, calculating a heat exchange capacity of each indoor unit.