Climate-Control Air Handler With Dual-Path Sensible and Latent Cooling
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Solution Overview
Problem
Conventional vapor-compression systems struggle to provide efficient and customized sensible and latent cooling across a wide range of outdoor weather conditions, often leading to over-cooling and inefficient humidity management.
Innovation Solution
A climate-control system incorporating a vapor-compression circuit with an air handler assembly featuring a movable valve that controls airflow through multiple paths, allowing for independent modulation of sensible and latent cooling based on humidity data from a humidistat, utilizing an air-to-air heat exchanger to selectively exchange heat between return and supply air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional vapor-compression systems are used to cool a space and reduce humidity, then cooling and dehumidification are achieved, but over-cooling occurs and energy efficiency is reduced
Solution Approach 1:
The system divides cooling into two separate pathways: a first airflow path through the evaporator for sensible cooling, and a second airflow path through the heat exchanger for latent cooling (dehumidification). This segmentation allows independent control of temperature and humidity, preventing over-cooling while maintaining energy efficiency.
Solution Approach 2:
The system uses a movable valve that can dynamically switch between different airflow configurations (first position for sensible cooling, second position for latent cooling, or intermediate positions for mixed modes). This dynamic adjustment enables the system to adapt to varying cooling and dehumidification requirements, optimizing energy efficiency while avoiding over-cooling.
2Adaptability or versatility
If conventional systems provide cooling and dehumidification, then humidity is reduced, but the system cannot provide customized sensible and latent cooling over a wider range of outdoor weather conditions
Solution Approach 1:
The movable valve enables dynamic switching between different operating modes (sensible cooling, latent cooling, or combined modes), allowing the system to adapt to varying outdoor weather conditions and provide customized cooling solutions for different climate scenarios.
Solution Approach 2:
The system integrates both sensible cooling (through the evaporator) and latent cooling (through the heat exchanger) capabilities in a single unit, making it universally applicable to a wide range of outdoor weather conditions and different cooling requirements.
3Adaptability or versatility
If a movable valve with multiple airflow paths is added, then customized sensible and latent cooling is achieved, but device complexity increases
Solution Approach 1:
The system combines the evaporator and heat exchanger into a single air handler assembly with integrated airflow paths, reducing overall system complexity despite adding the movable valve for customized cooling control.
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 provides more efficient and customized cooling by adjusting airflow paths to minimize over-cooling and optimize humidity reduction, enhancing comfort and energy savings by selectively dehumidifying without excessive temperature changes.
Implementation Method 1
Air flowing through the first heat-exchanger duct may be in a heat-transfer relationship with air flowing through the second heat-exchanger duct
Implementation Method 2
The vapor-compression circuit may include a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger. The compressor is configured to circulate a working fluid through the vapor-compression circuit
Implementation Method 3
The outdoor heat exchanger is in fluid communication with the compressor. The expansion device is in fluid communication with the outdoor heat exchanger. The indoor heat exchanger includes a conduit that is in fluid communication with the expansion device
Implementation Method 4
The indoor heat exchanger includes a conduit that is in fluid communication with the expansion device. The air handler assembly is configured to force air across the conduit of the indoor heat exchanger
Data Source
AI summary
A climate-control system may include a vapor-compression circuit and an air handler assembly. The vapor-compression circuit may include a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger. The indoor heat exchanger includes a conduit that is in fluid communication with the expansion device. The air handler assembly forces air across the conduit of the indoor heat exchanger. The air handler assembly may include an airflow device having a valve and an air-to-air heat exchanger. The air-to-air heat exchanger may include a first heat-exchanger duct and a second heat-exchanger duct. Air flowing through the first heat-exchanger duct may be in a heat-transfer relationship with air flowing through the second heat-exchanger duct. The airflow device may define a first airflow path and a second airflow path. The first airflow path may include the first heat-exchanger duct. The second airflow path may bypass the first heat-exchanger duct.