Ventilator Mode Switching for Lower Heating Load in Air Conditioning
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Solution Overview
Problem
Existing air conditioning systems face inefficiencies during heating operations due to increased loads when ventilation occurs during non-temperature control operations, leading to delayed heating and excessive cooling, which can increase the heating load on the air conditioner post-operation.
Innovation Solution
The system employs a ventilator with an exhaust fan and an air supply fan, adjusting their rotation rates to create negative pressure and reducing ventilation amounts during non-temperature control operations, and using a carbon dioxide sensor to increase ventilation when necessary, thereby managing ventilation modes to minimize heat exhaustion and carbon dioxide buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation is performed during non-temperature control operations (defrosting, oil recovering, thermostat off), then indoor air quality is maintained, but heating load on the air conditioner increases and heating efficiency decreases
Solution Approach 1:
The ventilator dynamically adjusts its operation mode based on the air conditioner's operational state. During non-temperature control operations, the ventilator switches to ventilation suppressed mode, dynamically adapting ventilation intensity to current system conditions rather than maintaining constant ventilation, thereby reducing heating load while preserving air quality during critical heating phases
Solution Approach 2:
The system changes the ventilation parameter (amount of ventilation) based on the operational phase of the air conditioner. During non-temperature control operations, ventilation amount is reduced or stopped, while during temperature control operations, normal ventilation is restored. This parameter change allows the system to optimize heating efficiency without compromising overall air quality
2Use of energy by moving object
If ventilation amount is reduced during non-temperature control operations, then heating load is suppressed, but indoor carbon dioxide concentration may increase
Solution Approach 1:
The ventilator implements periodic ventilation by alternating between ventilation suppressed mode during non-temperature control operations and normal ventilation mode during temperature control operations. This periodic action ensures that while heating load is reduced during critical phases, carbon dioxide accumulation is prevented during recovery phases, maintaining long-term air quality
Solution Approach 2:
The system uses the operational state of the air conditioner as feedback to control ventilator operation. When the air conditioner completes non-temperature control operations and returns to temperature control mode, this feedback triggers the ventilator to resume normal ventilation, thereby responding to system state changes and maintaining air quality through timely ventilation restoration
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 approach effectively suppresses the heating load on the air conditioner during non-temperature control operations, ensures proper ventilation, and prevents excessive carbon dioxide concentrations, allowing for efficient heating and maintaining set room temperatures.
Implementation Method 1
a total heat exchanger to exchange heat between the indoor air and the outdoor air
Data Source
AI summary
When the air conditioner implements the temperature controlling operation, the ventilator performs ventilation in a normal ventilation mode where a ventilation amount is set at a certain ventilation amount or more. When the air conditioner implements the operation not intended for temperature control, the ventilator performs ventilation in a ventilation suppressed mode where the number of rotations of an exhaust fan is made greater than that of an air supply fan to place indoor space in a negative pressure and ventilation is performed at an amount smaller than the certain ventilation amount or ventilation is stopped. In the ventilation suppressed mode, a ventilation amount is set to be smaller in response to a greater heating load that is increased by ventilation performed during the operation not intended for temperature control.