Climate-control system with 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 and an air handler assembly with a movable valve that controls airflow paths through an air-to-air heat exchanger, allowing independent modulation of sensible and latent cooling based on humidity data from a humidistat, ensuring optimal comfort and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional vapor-compression systems are used to cool a space and reduce humidity, then cooling and dehumidification are achieved, but the system cannot provide customized sensible and latent cooling over a wide range of outdoor weather conditions
Solution Approach 1:
The system divides the cooling function into two independent pathways: a first airflow path through the evaporator for latent cooling (dehumidification), and a second airflow path bypassing the evaporator for sensible cooling. This segmentation allows independent control of humidity removal and temperature reduction, enabling customized cooling strategies adapted to different weather conditions without compromising system reliability.
2Ease of operation
If conventional systems cool a space and reduce humidity, then both cooling and dehumidification are provided, but the system often leads to over-cooling and inefficient humidity management
Solution Approach 1:
The system employs a movable valve that dynamically switches between two airflow paths based on real-time humidity conditions. When dehumidification is needed, the valve directs air through the evaporator; when only sensible cooling is required, the valve bypasses the evaporator. This dynamic adaptation prevents over-cooling by matching the cooling strategy to actual humidity levels, improving operational efficiency and reducing energy waste.
Solution Approach 2:
The system changes the operational parameter of the airflow path based on humidity conditions. By switching the valve position, the system alters which airflow path is active (through evaporator or bypassing evaporator), thereby adjusting the cooling mode between latent and sensible cooling to match humidity management requirements and avoid energy-consuming over-cooling.
3Adaptability or versatility
If a movable valve with multiple airflow paths is added to enable customized cooling, then sensible and latent cooling can be modulated independently, but device complexity increases
Solution Approach 1:
The movable valve serves multiple functions: it directs airflow through the evaporator for dehumidification, bypasses the evaporator for sensible cooling, and can potentially mix both paths for combined cooling. This multi-functionality allows the single valve component to provide independent modulation of sensible and latent cooling without requiring multiple separate control mechanisms, thereby limiting the increase in device complexity while maintaining high adaptability.
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 modulates cooling to reduce humidity without over-cooling, providing customized and efficient sensible and latent cooling, enhancing comfort and reducing energy consumption.
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 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
Data Source
Figure 1
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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.