Induction displacement unit
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Solution Overview
Problem
Induction-displacement units in HVAC systems face challenges in providing effective heating along exterior walls while maintaining displacement ventilation, as delivered air rises instead of pooling across the floor in heating mode, necessitating separate heating systems that cannot be placed in the same location as these units.
Innovation Solution
An induction displacement unit design featuring an induction plenum communicating with both a heating coil and a cooling coil, where the heating coil is positioned above the cooling coil, allowing for vertical and horizontal air discharge configurations to manage temperature and air flow effectively, enabling simultaneous heating and ventilation without the need for separate heating systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If induction-displacement units are used for displacement ventilation, then indoor air quality is improved and energy use is reduced, but the units cannot provide effective heating along exterior walls because delivered air rises instead of pooling across the floor
Solution Approach 1:
The air discharge system is segmented into separate upper and lower discharge plenums, with the upper plenum delivering heated air vertically along the exterior wall and the lower plenum delivering cooled air horizontally across the floor. This segmentation allows each discharge to perform its specialized function effectively.
Solution Approach 2:
The invention introduces a vertical dimension to heating by delivering heated air through the upper discharge plenum in a vertical direction along the exterior wall, rather than attempting horizontal distribution. This dimensional change enables effective heating without disrupting the horizontal displacement ventilation pattern.
2Temperature
If a separate heating system is provided in the space, then heating along exterior walls can be achieved, but the heating system cannot be placed in the same location as the induction-displacement units
Solution Approach 1:
The heating and cooling coils are merged into a single induction-displacement unit housing, with both coils connected to separate discharge plenums. This integration eliminates the need for separate heating systems and reduces overall system complexity while maintaining both heating and ventilation functions at the same location.
Solution Approach 2:
The induction-displacement unit is designed with multi-functionality, serving both as a displacement ventilation device and as a heating device. The upper discharge plenum with heating coil provides heating along exterior walls, while the lower discharge plenum provides cooling and ventilation, making the unit universally applicable for both functions.
3Temperature
If the heating coil is positioned to deliver air horizontally, then heating can be provided, but the air rises immediately instead of pooling across the floor for displacement ventilation
Solution Approach 1:
The discharge system is segmented into upper and lower plenums with different discharge orientations. The upper plenum delivers heated air vertically to prevent immediate rising and pooling issues, while the lower plenum maintains horizontal discharge for effective displacement ventilation. This segmentation resolves the conflict between heating and displacement ventilation functions.
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 design allows for efficient heating of exterior walls while maintaining displacement ventilation, providing a uniform temperature profile and reducing noise, thus addressing the limitations of existing systems by enabling simultaneous heating and ventilation without requiring additional heating systems.
Implementation Method 1
Heat generated by the occupants and equipment in the space causes ventilation air to be naturally drawn up by convection
Implementation Method 2
Cool, rather than cold supply air is provided directly to occupants through low mounted diffusers. Heat generated by the occupants and equipment in the space causes ventilation air to be naturally drawn up by convection
Data Source
AI summary
An induction displacement unit comprising an induction plenum comprising a plurality of first nozzles communicating with a first discharge plenum and a plurality of second nozzles communicating with a second discharge plenum, a return air plenum, a heating coil disposed between the return air plenum and the first discharge plenum, a cooling coil disposed between the return air plenum and the second discharge plenum, the induction plenum vertically disposed between the heating coil and the cooling coil, the heating coil disposed in an upper portion of the unit, the first discharge plenum disposed to induce a substantially vertical discharge, and the second discharge plenum disposed to induce a substantially horizontal discharge.