HVAC Ventilation Control Using Night Pre-Cooling Air
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Solution Overview
Problem
HVAC systems consume energy and wear out equipment quickly, leading to high operational costs and reduced efficiency, as they rely heavily on mechanical cooling systems rather than utilizing exterior ambient air for temperature control.
Innovation Solution
A system and method that monitor interior and exterior temperatures, operational time, and load of the HVAC system to control ventilation, allowing for the efficient use of outside air for cooling and ventilation by determining suitable times and conditions for venting outside air into the structure, thereby reducing mechanical cooling system usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If mechanical cooling systems are used to condition interior air, then temperature control is achieved, but energy consumption increases and equipment wear increases
Solution Approach 1:
The system performs pre-cooling of the building during nighttime hours when exterior temperatures are lower, storing cooling capacity in the building's thermal mass. This preliminary action reduces or eliminates the need for mechanical cooling during subsequent daytime occupied periods, thereby reducing energy consumption and equipment wear while maintaining temperature control.
2Temperature
If mechanical cooling systems are used to condition interior air, then temperature control is achieved, but equipment wear and failure rate increase
Solution Approach 1:
The system performs pre-cooling of the building during nighttime hours when exterior temperatures are lower, storing cooling capacity in the building's thermal mass. This preliminary action reduces or eliminates the need for mechanical cooling during subsequent daytime occupied periods, thereby reducing equipment wear and failure rate while maintaining temperature control.
3Object-generated harmful factors
If exterior air dampers are used to circulate fresh exterior air, then indoor air quality is improved, but energy efficiency decreases when exterior air is warmer than interior air
Solution Approach 1:
The system introduces fresh exterior air during nighttime pre-cooling periods when exterior temperatures are lower, improving indoor air quality and pre-cooling the building simultaneously. This preliminary action allows the building to benefit from both fresh air intake and cooling, reducing the need for mechanical cooling during daytime while maintaining air quality.
Solution Approach 2:
The system changes the operational parameters of air dampers based on time of day and temperature conditions. During nighttime pre-cooling, exterior air dampers are opened to allow fresh air intake when exterior temperatures are lower. During daytime occupied periods, damper positions are adjusted based on real-time temperature comparisons, allowing fresh air intake only when exterior air is cooler than interior air, thereby maintaining air quality while optimizing energy efficiency.
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 enhances energy efficiency, reduces equipment wear, and improves indoor air quality by leveraging exterior ambient conditions to condition interior air, minimizing the need for mechanical cooling and heating.
Implementation Method 1
utilizing exterior ambient air for cooling and ventilating buildings
Implementation Method 2
condition the interior air of the structure to desired temperatures by utilizing suitable exterior air
Data Source
AI summary
A system and method for operating an HVAC system having a cooling system and ventilation system to vent outside air within a structure is disclosed. The method includes monitoring an interior temperature of the structure, monitoring an exterior temperature of ambient air outside of the structure, defining a first time range and a second time range, associating one or more operating parameters of the HVAC system with the first time range, associating one or more operating parameters of the HVAC system with the second time range, monitoring operational time and operational load of the cooling system for the first time range, and controlling the ventilation system during the second time range based upon the monitored operational time and operational load of the cooling system in the first time range, and the monitored interior and exterior temperatures.