Air conditioning ventilation device, air conditioning system, and control method
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Solution Overview
Problem
Existing air conditioning systems face inefficiencies in energy-saving performance during outdoor air cooling due to increased power consumption from higher ventilation air flow rates, which limits the effectiveness of reducing air conditioning loads.
Innovation Solution
An air conditioning ventilation device with a bypass air path and control means that switches between air paths to bypass the heat exchanger, stopping the air-blowing means in the path without a bypass, thereby reducing power consumption and improving energy-saving performance during outdoor air cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the ventilation air flow rate is increased to enhance outdoor air cooling effect, then the air conditioning load is reduced, but the power consumption of the fan increases
Solution Approach 1:
The air path is segmented into multiple independent paths (first air path for outdoor air supply, second air path for indoor air discharge, and bypass air path). This allows selective operation of different air paths based on conditions, enabling the system to achieve outdoor air cooling without necessarily increasing the fan's ventilation air flow rate in the main path.
Solution Approach 2:
The bypass air path acts as an intermediary that provides an alternative route for air flow. By introducing this intermediate path and using air path switching means to control it, the system can manage air flow distribution more flexibly, reducing the need to increase main path fan speed to achieve cooling effects.
2Temperature
If the blown air flow rate of the fan is increased during outdoor air cooling, then the outdoor air cooling effect is enhanced, but the overall energy-saving performance does not improve significantly
Solution Approach 1:
The system dynamically switches between different air path configurations using air path switching means. During outdoor air cooling, the bypass air path is opened and the control means stops the air-blowing means in paths without bypass, creating a dynamic adaptation to operating conditions that optimizes energy performance.
Solution Approach 2:
The system changes operational parameters by switching air paths rather than continuously increasing fan flow rate. The control means adjusts which air paths are active (opening/closing bypass) and adjusts fan operation accordingly, changing the system's operational state to achieve cooling without proportionally increasing energy consumption.
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 configuration effectively lowers energy consumption and enhances energy-saving performance by controlling the air path switching and fan operation, allowing for improved outdoor air cooling efficiency without increasing overall air flow rates.
Implementation Method 1
heat exchange means for performing heat exchange between air passing through the first air path and air passing through the second air path
Data Source
AI summary
A control unit determines, on the basis of a temperature and humidity detected by sensors, whether outdoor air cooling that takes outdoor air into a room is effective. Upon determination that the outdoor air cooling is effective, the control unit opens a damper and causes stoppage of an air supply fan disposed in an air supply path. Due to such operation, indoor air passing through an air discharge path bypasses a total heat exchanger by passing through a bypass air path, and thereby is discharged to the outdoors as exhaust air. However, due to stoppage of the air supply fan, although the outdoor air does not flow through the air supply path, the outdoor air flows into a building from an opening of the building.