Induction Displacement Unit Layout for Heating and Ventilation
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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 the 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 the 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 air flow and temperature effectively, enabling simultaneous heating and ventilation without the need for separate heating systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an induction-displacement unit delivers heated air in heating mode, then the air temperature is raised to maintain space temperature set point, but the delivered air rises immediately instead of pooling across the floor, causing the unit to lose its displacement ventilation function
Solution Approach 1:
The unit is divided into separate heating and cooling modules with independent air discharge paths. The heating module discharges air through upper nozzles while the cooling module discharges through lower nozzles, allowing each module to operate independently without interfering with the displacement ventilation function of the other.
Solution Approach 2:
Different parts of the unit are designed with different discharge characteristics - the heating module uses upward-discharging nozzles positioned at the top, while the cooling module uses forward-discharging nozzles positioned at the bottom. This local differentiation allows each module to perform its specific function optimally.
2Temperature
If a separate heating system such as fin-tube radiation or radiant panels is provided in the space, then heating can be provided to the space, but such heating systems cannot be placed in the same location as the induction-displacement units along the exterior wall
Solution Approach 1:
The heating function is merged into the induction-displacement unit itself, combining previously separate functions (displacement ventilation and heating) into a single integrated device. This eliminates the need for separate heating systems and allows both functions to be provided from the same location along the exterior wall.
Solution Approach 2:
The induction-displacement unit is designed to perform multiple functions - displacement ventilation, heating, and cooling - all within a single device. The unit can operate in different modes (heating mode, cooling mode, or ventilation only) depending on seasonal requirements, making it a universal solution for both heating and cooling needs.
3Temperature
If the heating coil is positioned to heat the return air, then the delivered air temperature can be raised, but the air starts rising as soon as it leaves the unit instead of pooling across the floor
Solution Approach 1:
Instead of discharging heated air forward like the cooling module, the heating module inverts the discharge direction by positioning nozzles at the top that discharge air upward. This inverted approach allows the heated air to rise naturally along the wall as intended, creating a thermal barrier without disrupting the cooling module's forward-discharge displacement ventilation pattern.
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 unit provides efficient heating and ventilation by ensuring heated air is distributed vertically along the perimeter wall, neutralizing cold loads while maintaining displacement ventilation principles, and can operate in both heating and cooling modes without additional heating systems, enhancing indoor air quality and energy efficiency.
Implementation Method 1
a heating coil disposed between the return air plenum and the first discharge plenum
Implementation Method 2
a cooling coil disposed between the return air plenum and the second discharge plenum
Implementation Method 3
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
Data Source
AI summary
An induction displacement unit is disclosed that includes an induction plenum having first nozzles communicating with a first discharge plenum and second nozzles communicating with a second discharge plenum, a return air plenum and a heating coil disposed between the return air plenum and the first discharge plenum. In addition, the induction displacement unit has a cooling coil disposed between the return air plenum and the second discharge plenum, where the induction plenum is vertically disposed between the heating coil and the cooling coil. The heating coil is disposed in an upper portion of the unit. The first discharge plenum is disposed to induce a substantially vertical discharge, and the second discharge plenum disposed to induce a substantially horizontal discharge.