System and method to create indoor thermal environment based on IJV and DPV
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Solution Overview
Problem
Traditional HVAC systems, such as mixed ventilation, displacement ventilation, and impinging jet ventilation (IJV), face challenges in providing thermal comfort and energy efficiency, especially in varying environmental conditions like winter, where they can lead to thermal discomfort and increased energy consumption.
Innovation Solution
A system and method combining impinging jet ventilation (IJV) with ductless personalized ventilation (DPV) to create an indoor thermal environment. This system includes an IJV duct installed on a room wall and a DPV device placed on a table, which uses a duct fan to adjustably supply clean, cold air directly to the user's face area from the ground air lake, reducing temperature differences and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If IJV is used to provide high air supply speed and cover the whole room, then the ventilation coverage is improved, but thermal discomfort occurs due to feet blowing sensation and head-to-feet temperature differences
Solution Approach 1:
The ventilation system is segmented into two independent parts: IJV for overall room ventilation and DPV for localized personal comfort. The DPV device is a separate unit that can be independently controlled and positioned near individual users, allowing personalized air supply without affecting the overall room ventilation pattern.
Solution Approach 2:
The DPV device provides localized personalized ventilation with adjustable air supply parameters tailored to individual user needs. The air supply panel directs airflow specifically to the user's face and upper body area, creating a local comfortable thermal environment while the rest of the room maintains the IJV-induced thermal stratification.
2Loss of energy
If DV is used to achieve energy-saving effects through thermal stratification, then energy consumption is reduced, but the system cannot be used in winter because low momentum hot air floats upward before reaching the room
Solution Approach 1:
The system merges IJV and DPV into a hybrid ventilation system that combines the energy-saving thermal stratification capability of DV with the seasonal adaptability of IJV. The IJV component provides high-momentum air supply that can be used in both summer and winter, while the DPV component adds personalized comfort control.
Solution Approach 2:
The hybrid IJV-DPV system serves multiple functions: it provides overall room ventilation, creates thermal stratification for energy saving, and offers personalized comfort control. The system can adapt to different seasonal conditions through the IJV's high-momentum air supply capability, making it universally applicable year-round.
3Temperature
If traditional mixed ventilation is used to provide uniform temperature distribution, then thermal comfort is maintained, but energy consumption increases due to lack of thermal stratification
Solution Approach 1:
The system creates different temperature zones with different qualities: the lower room area maintains cooler temperatures for energy saving through thermal stratification, while the user's local environment (face and upper body) receives conditioned air from DPV to maintain comfort. This allows energy saving without sacrificing local thermal comfort.
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 combined IJV and DPV system effectively reduces head-to-feet temperature differences and the blowing sensation associated with IJV alone, enhancing user thermal comfort while lowering energy consumption and offering potential for energy savings.
Implementation Method 1
a duct fan, disposed in the lower duct, an air supply volume of the duct fan is adjustable, and the duct fan is configured to send air absorbed from a ground air lake to a user's face area
Implementation Method 2
The IJV sends a high momentum wind sent by an air duct spreads around after hitting a floor to form a thin air lake
Implementation Method 3
When the cold air meets a heat source, it is heated and rises to form a thermal plume, resulting in a thermal stratification in the room
Data Source
AI summary
A system and a method are provided to create an indoor thermal environment based on impinging jet ventilation (IJV) and ductless personalized ventilation (DPV), the system includes an IJV duct installed on a wall of a room and a DPV device installed on a table. An air inlet of the IJV duct is connected to an air conditioning system and an air outlet of the IJV duct is close to ground. An upper duct and a lower duct of the DPV device are disposed on two opposite sides of a tabletop, the upper duct is provided with an air supply panel, the lower duct is provided with a duct fan with an air supply volume being adjustable, and the duct fan is configured to send air absorbed from a ground air lake to a user's face area through the air supply panel of the upper duct.