Ventilation arrangement with an extractor hood
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Solution Overview
Problem
Existing ventilation arrangements for extractor hoods in large kitchens and ships face challenges in optimizing energy efficiency and vapor extraction, with limited control over energy usage and adverse vortex formations leading to suboptimal performance.
Innovation Solution
A ventilation arrangement with an extractor hood connected to a central extraction system, featuring a return connection with a branch duct and guide sensors that allow for variable adaptation and optimal control of exhaust air flow, enabling significant energy savings through recirculation and targeted vapor management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a traditional extractor hood with distribution duct is used, then vapor extraction is achieved, but energy efficiency is poor and vortex formations occur
Solution Approach 1:
The return connection is integrated into the multi-layer wall construction of the extractor hood, with branch ducts nested within the wall structure. This allows the exhaust air recirculation system to be incorporated without adding external complexity, achieving energy efficiency improvements while maintaining compact hood design.
Solution Approach 2:
The system recovers and recirculates a portion of the filtered exhaust air back into the vapor intake space through the return connection and branch ducts. This reduces energy loss by reusing thermal energy and improves overall system efficiency without requiring complete exhaust air disposal.
2Loss of energy
If exhaust air is completely discharged without recirculation, then vapor extraction is effective, but energy savings are limited
Solution Approach 1:
The return connection incorporates controllable drive mechanisms that allow dynamic adjustment of exhaust air recirculation volume. The system can adapt the recirculation rate based on operational conditions, enabling optimal energy savings while maintaining effective vapor extraction when needed.
Solution Approach 2:
The system changes the parameter of exhaust air volume recirculated through the branch ducts, allowing variable control between complete discharge and partial recirculation modes. This enables optimization of energy savings according to specific operational requirements and kitchen conditions.
3Ease of operation
If a controllable drive for air displacement is added, then optimal control is achieved, but device complexity increases
Solution Approach 1:
The controllable drive mechanisms are integrated into the existing hood structure, serving multiple functions: controlling exhaust air recirculation, maintaining differential pressure, and enabling adaptive operation. This multi-functionality reduces the need for separate control devices, minimizing the increase in overall system complexity.
Solution Approach 2:
The system incorporates differential pressure monitors that provide feedback to the controllable drives, enabling automatic adjustment of exhaust air recirculation. This feedback mechanism optimizes control capability while reducing the need for complex manual control systems.
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 solution achieves energy savings of 25% to 90% by optimizing exhaust air recirculation and reducing the need for fresh air intake, while ensuring effective vapor extraction and distribution, particularly in large kitchens and ships.
Implementation Method 1
a mixed air consisting of circulating air, external fresh air and/or kitchen vapor can be detected by means of a variably configurable sensor structure, particularly in the region of the duct of the fluid system
Implementation Method 2
a return connection which has at least one branch duct extending outside the vapor intake space... covering a partial volume of the filtered exhaust air... can be returned to the fume collection room
Data Source
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Figure 5
AI summary
Ventilation arrangement having a vapor extraction hood for the galley area of marine equipment, that, by means of an outlet pipe of a venting system, forms a vapor receiving chamber which is open at the bottom in the installed position, whence vapor is received at least in one duct via a separator and is conveyed to the outlet pipe as exhaust air. The duct provided in the form of a distribution shaft is provided with a recirculation connection that collects a partial volume of the filtered exhaust air, this recirculation connection discharges toward the vapor receiving chamber in the region of at least one transit chamber and at the exit thereof there is provided a cover that influences the flow direction of the recirculated partial volume. There is provided a branch duct which forms the recirculation connection and which extends, outside the vapor receiving chamber, between the region of the distribution shaft and of the transit chamber. Thus, a partial volume of the exhaust air can be recirculated from the region of the distribution shaft into the vapor receiving chamber. The venting system is connected to a motorized central ventilation system as the source of suction, which interacts via a control unit with a drive member of a control flap. A guide sensor, which influences the operating values of the control unit, is integrated into the fluid conveying system that receives exhaust air.