Air-conditioning ventilation system
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Solution Overview
Problem
Existing air-conditioning ventilation systems fail to maintain an appropriate ventilation rate over time, leading to insufficient ventilation when the rate is set too low for extended periods, despite efforts to reduce power consumption by coordinating with air-conditioning apparatuses.
Innovation Solution
An air-conditioning ventilation system that includes a ventilation device and an air-conditioning apparatus, controlled by a controller to adjust ventilation rates based on the air-conditioning capacity, ensuring the integrated ventilation value remains within a standard range by switching between 'low', 'standard', and 'high' rates to prevent insufficient ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the ventilation rate is reduced to lower power consumption of the air-conditioning apparatus, then energy efficiency is improved, but the ventilation amount becomes insufficient over time
Solution Approach 1:
The ventilation rate is made dynamically adjustable rather than fixed. The system switches between a reduced ventilation rate (for energy efficiency) and a standard ventilation rate (for adequate ventilation) based on accumulated ventilation amount, allowing the system to adapt its behavior to balance energy consumption and ventilation requirements
Solution Approach 2:
The system implements periodic switching between different ventilation rates. By accumulating ventilation amounts over time and comparing against a standard value, the system periodically adjusts the ventilation rate to ensure adequate total ventilation while spending most time in energy-efficient low-rate operation
Solution Approach 3:
The system uses feedback from the accumulated ventilation amount to control the ventilation rate. The controller monitors the total ventilation provided and adjusts the ventilation rate accordingly, increasing it when the accumulated amount falls below the standard value and reducing it when the standard is met, creating a closed-loop control system
2Loss of energy
If the ventilation rate is maintained at a low level for extended periods, then power consumption is reduced, but the required ventilation amount cannot be secured
Solution Approach 1:
The system performs preliminary action by accumulating ventilation amounts over time before making adjustment decisions. Rather than reacting to immediate ventilation deficiencies, the system proactively tracks the cumulative ventilation provided and plans future rate adjustments to ensure the standard is met before switching to higher rates
Solution Approach 2:
The system changes the ventilation rate parameter between two discrete levels (reduced and standard) based on the accumulated ventilation amount. This parameter switching allows the system to optimize energy consumption during periods when the standard is met while ensuring adequate ventilation when the accumulated amount approaches or falls below the standard value
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 system effectively maintains appropriate ventilation levels by dynamically adjusting ventilation rates, preventing insufficient ventilation and ensuring continuous, efficient operation of both ventilation and air-conditioning systems.
Implementation Method 1
an air-conditioning apparatus including a heat exchanger configured to exchange heat between refrigerant and air
Data Source
AI summary
An air-conditioning ventilation system includes a ventilation device configured to ventilate an air-conditioned space while controlling a ventilation rate, an air-conditioning apparatus that includes a heat exchanger configured to exchange heat between refrigerant and air and that is configured to operate while controlling an air-conditioning capacity thereof to bring an indoor temperature in the air-conditioned space to a setting temperature, and a controller. The controller performs normal control that causes the ventilation device to operate to ventilate the air-conditioned space at a ventilation rate corresponding to the air-conditioning capacity of the air-conditioning apparatus, and recovery control that controls the ventilation rate of the ventilation device such that an integrated value of an amount of ventilation for a time duration from activation of the ventilation device under the normal control falls within a standard ventilation range including a standard integrated value of an amount of ventilation obtained by causing the ventilation device to operate to ventilate the air-conditioned space at a standard ventilation rate for a time duration having a same length as the time duration.