Efficient Heating Design for Centrifugal Fan Air Conditioners
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Summary
Problems
Air conditioning apparatuses with rearward bladed centrifugal fans face inefficiencies in heating due to swirling airflow patterns, which hinder effective distribution and concentration of heat near the blow-out port.
Innovation solutions
The air conditioning apparatus is designed with a centrifugal fan oriented such that its rotary shaft aligns with both the fan entrance and blow-out port, and heating means are strategically positioned within the blow-out port opposed space, including first and second heating elements with varying capacities, to address airflow tendencies and enhance heating efficiency.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If heating means is mounted in the vicinity of the blow-out port in a centrifugal fan air conditioning apparatus, then the heating function can be provided, but the heating efficiency is reduced due to swirling airflow patterns
Why choose this principle:
The heating means is positioned specifically in the blow-out port opposed space, which is a localized region opposite the blow-out port within the fan downwind space. This local positioning allows the heating means to operate in a region where airflow patterns are more favorable for heat transfer, specifically where air flows from the rearward side toward the forward side in the rotary direction of the bladed wheel, thereby improving heating efficiency while maintaining the heating function
Principle concept:
If heating means is mounted in the vicinity of the blow-out port in a centrifugal fan air conditioning apparatus, then the heating function can be provided, but the heating efficiency is reduced due to swirling airflow patterns
Why choose this principle:
The heating means is placed upstream in the airflow path within the blow-out port opposed space, allowing it to heat the air before the air reaches the blow-out port and exits the apparatus. This preliminary heating action ensures that the heated air is effectively distributed throughout the target space, resolving the contradiction between providing heating function and maintaining heating efficiency
Application Domain
Data Source
AI summary:
The air conditioning apparatus is designed with a centrifugal fan oriented such that its rotary shaft aligns with both the fan entrance and blow-out port, and heating means are strategically positioned within the blow-out port opposed space, including first and second heating elements with varying capacities, to address airflow tendencies and enhance heating efficiency.
Abstract
An air conditioning apparatus includes a casing having intake and blow-out ports, a partition member dividing an interior of the casing, a heat exchanger, a centrifugal fan, and a heater. The centrifugal fan includes a bladed wheel having a plurality of rearward blades and sucks air existing in the heat exchanger compartment into the fan compartment through the fan entrance. The bladed wheel is mounted in the fan compartment such that a rotary shaft of the bladed wheel is oriented along an opening direction of the fan entrance and an opening direction of the blow-out port. The heater is mounted in a blow-out port opposed space. The blow-out port opposed space is a region opposed to the blow-out port within a fan downwind space. The fan downwind space is a space located on a downwind side of the bladed wheel within the fan compartment.