Neutral Wall Air Terminal with Separate Heating and Displacement Paths
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Solution Overview
Problem
Existing induction-displacement ventilation systems struggle to provide simultaneous heating and displacement ventilation, especially along exterior walls where heating is most needed, as the induction-displacement units lose their displacement function when delivering heated air, requiring separate heating systems that cannot be placed in the same location.
Innovation Solution
An induction-displacement neutral wall air terminal unit with a separate heating airflow path, induction-type nozzles, and a heating element that allows for simultaneous delivery of a cool supply airflow stream and a warm heating airflow stream, enabling efficient heating and ventilation without losing displacement functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the induction-displacement unit delivers heated air to provide heating, then heating function is improved, but the displacement ventilation function deteriorates because the heated air rises immediately instead of pooling across the floor
Solution Approach 1:
The air terminal unit is segmented into separate heating airflow path and supply airflow path, allowing independent control of heating and displacement ventilation functions. The heating path delivers warm air through a dedicated outlet while the supply path maintains cool displacement air delivery through induction nozzles, resolving the conflict between heating and displacement functions
2Temperature
If a separate heating system is provided to enable heating function, then heating capability is improved, but device complexity increases and the heating system cannot be placed in the same location as the induction-displacement units along exterior walls
Solution Approach 1:
The heating system and displacement ventilation system are merged into a single integrated air terminal unit. The unit combines a heating element with heating airflow path, induction nozzles, and supply airflow path, allowing both functions to operate simultaneously from the same location along exterior walls, eliminating the need for separate heating systems
3Reliability
If the induction-displacement unit is located along an exterior wall to provide displacement ventilation, then ventilation function is improved, but the ability to provide heating deteriorates because separate heating systems cannot be placed in the same location
Solution Approach 1:
The air terminal unit is designed with multi-functionality to serve both displacement ventilation and heating purposes. By integrating the heating element and heating airflow path with the displacement ventilation components, the unit can be universally placed along exterior walls to provide both cooling/ventilation and heating functions, eliminating the need for different equipment locations
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
Enables efficient simultaneous heating and displacement ventilation, maintaining a desired space temperature and reducing the need for separate heating systems, while meeting noise requirements and providing high efficiency and quiet operation.
Implementation Method 1
The induction-type nozzles are constructed and arranged to deliver a ventilation air flow stream into the supply air flow path and to induce a return air flow stream through the return air flow path that mixes with the ventilation air flow stream
Implementation Method 2
a heating element disposed within a portion of the housing defining the heating airflow path
Implementation Method 3
Due to the heat generated by the occupants and equipment in the space, the ventilation air is naturally drawn up by convection which ensures fresh air is continually delivered to the breathing zone of the occupants
Data Source
AI summary
An induction-displacement neutral wall air terminal unit includes a housing defining a supply airflow path, a connected return airflow path, and a heating airflow path separated from the supply and return airflow paths by at least one interior wall. The unit also includes a plurality of induction-type nozzles located within the supply airflow path, that are deliver a ventilation air flow stream into the supply air flow path. The nozzles induce a return air flow stream through the return air flow path that mixes with the ventilation air flow stream to form a supply air flow stream delivered to a supply air outlet. A heating element is disposed within the heating airflow path to heat air within the heating air flow path. A plurality of fans may be placed within the heating airflow path to increase the overall heating capacity of the unit.