Multi-functional HVAC indoor unit
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Solution Overview
Problem
Conventional air conditioning systems are inefficient in dehumidifying air during periods of moderate temperatures, often requiring additional equipment and increasing energy consumption, which can lead to uncomfortable indoor humidity levels and decreased system efficiency.
Innovation Solution
A multi-functional heat pump system incorporating two indoor heat exchangers, a compressor, a reversing valve, a thermal expansion valve, and a three-way switching valve, allowing for independent heating, cooling, and dehumidification by configuring the heat exchangers in parallel for heating and cooling modes and in series for dehumidification, with a controller managing the operation based on selected modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional air conditioning systems cool the air to dehumidify during bridge months, then dehumidification is achieved, but the temperature drops to uncomfortable levels
Solution Approach 1:
The system divides the dehumidification function into two separate processes: a cooling coil that condenses moisture and a heating coil that reheats the air. This segmentation allows independent control of humidity removal and temperature maintenance, resolving the contradiction between achieving dehumidification and maintaining comfortable temperature.
Solution Approach 2:
The system introduces a third component (heating coil) as an intermediary between the cooling coil and the space. The heating coil acts as a mediator that adds heat to the cooled air stream, enabling the system to remove moisture while compensating for the temperature drop and maintaining thermal comfort.
2Adaptability or versatility
If stand-alone dehumidifier or reheat system is added to achieve independent dehumidification, then dehumidification capability is improved, but system complexity and installation cost increase
Solution Approach 1:
The system merges the dehumidification and heating functions into a single integrated unit by combining the cooling coil, heating coil, and associated controls within the existing air handler. This consolidation provides independent dehumidification capability without requiring separate stand-alone equipment, reducing installation complexity and space requirements.
Solution Approach 2:
The air handling system is designed with multi-functionality, capable of performing cooling, heating, and dehumidification through a single integrated configuration. The system can operate in different modes (cooling only, heating only, or dehumidification with reheat) depending on environmental conditions, eliminating the need for multiple specialized devices.
3Temperature
If reheat heat exchanger is added to maintain temperature after dehumidification, then temperature comfort is improved, but energy consumption and pressure drop increase
Solution Approach 1:
The system changes the operational parameters of the heating coil based on real-time conditions. The heating coil is activated only when dehumidification is required and the cooled air temperature falls below the desired supply temperature. This conditional operation optimizes energy usage by avoiding unnecessary reheating while maintaining temperature comfort when needed.
Solution Approach 2:
The system maintains continuous monitoring and adaptive control of the heating coil operation to ensure that reheating occurs only when necessary. The control system continuously adjusts the heating coil activation based on temperature and humidity sensors, ensuring that energy is used efficiently to maintain comfort without continuous operation that would waste energy.
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 dehumidifies air without significant temperature changes, maintaining comfort and efficiency throughout the year, reducing the need for additional equipment and energy consumption.
Implementation Method 1
The indoor heat exchangers exchange heat between a working medium and air to be conditioned
Implementation Method 2
The outdoor heat exchanger exchanges heat between the working medium and outside air
Implementation Method 3
the thermal expansion valve reduces pressure of the working medium
Implementation Method 4
a compressor
Implementation Method 5
The indoor heat exchangers operate as parallel evaporators downstream of the outdoor heat exchanger in cooling mode, as parallel condensers upstream of the outdoor heat exchanger in heating mode
Data Source
AI summary
An indoor unit for heating, cooling, and dehumidifying air is disclosed. In an embodiment, the indoor unit includes a first coil assembly and a second coil assembly. When operating in a cooling mode or a heating mode, the first coil and second coil are in parallel fluid communication. When in a dehumidifying mode, the first coil and second coil are in serial fluid communication, which enables the first coil to function as a condenser and the second coil to function as an evaporator. The disclosed indoor unit provides negligible or no change in sensible heat while providing dehumidification.