Multi-blower HVAC Layout for Evaporator Airflow

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Solution Overview

Problem

Traditional HVAC systems for vehicles often face inefficiencies in evaporator performance, particularly in delivering both heated and cooled air effectively across a single evaporator, which can lead to reduced cooling capacity and increased energy consumption.

Innovation Solution

A multi-blower HVAC layout is introduced, featuring a first blower and a second blower operating in parallel, with separate passageways that direct fresh and recirculated air independently into a common passageway across an evaporator with distinct temperature regions, enhancing airflow distribution and cooling efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a single blower is used in traditional HVAC systems, then the device complexity is reduced, but the cooling capacity and evaporator performance are insufficient

Engineering Contradiction:

Improvecooling capacityVSAvoidblower configuration

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The single blower is segmented into multiple blowers (first blower and second blower) with separate passageways. Each blower handles different air streams independently, allowing optimized airflow control across different regions of the evaporator, thereby increasing cooling capacity while maintaining manageable system complexity through modular design

Inventive Principle:

Principle #1Segmentation

2Device complexity

If air streams are mixed in a common passageway, then the device complexity is reduced, but the airflow distribution uniformity across the evaporator deteriorates

Engineering Contradiction:

Improvepassageway configurationVSAvoidairflow distribution uniformity

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The passageway system is segmented into separate first and second passageways that remain distinct until they reach the common passageway near the evaporator. This segmentation allows each air stream to be controlled independently with appropriate airflow rates and distributions, ensuring uniform airflow across different regions of the evaporator while only combining streams at the final stage

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the evaporator receive air with different properties from the separate passageways. The first passageway delivers air with specific flow characteristics to certain evaporator regions, while the second passageway delivers recirculated air with different characteristics to other regions, optimizing local heat transfer efficiency across the entire evaporator surface

Inventive Principle:

Principle #3Local quality

3Productivity

If multiple blowers operate in parallel with separate passageways, then the cooling capacity increases, but the device complexity increases

Engineering Contradiction:

Improvecooling capacityVSAvoidblower and passageway system

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system is segmented into modular components (multiple blowers, separate passageways, common passageway) that can be independently designed, manufactured, and maintained. This modularity increases cooling capacity through parallel operation while keeping each component's complexity manageable and allowing independent optimization of each segment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The common passageway serves multiple functions by receiving air streams from both the first and second passageways and distributing the combined airflow across the evaporator. This multi-functionality reduces the need for additional separate components, thereby increasing cooling capacity without proportionally increasing overall system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 configuration increases the cooling capacity and efficiency of the HVAC system, allowing for improved temperature control in vehicle cabins while maintaining a compact design and reducing noise levels, thereby enhancing fuel economy.

Implementation Method 1

Air can flow over an evaporator of the cooling cycle to be chilled

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

refrigerant flows through the cooling cycle and changes temperature through the cycle

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 3

The first and second blowers are configured to operate in parallel to deliver air to the common passage

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Data Source

PatentUS9533543B2Multi-blower HVAC layout for improved evaporator performance

Publication Date: 2017.01.03 DENSO INTERNATIONAL AMERICA INC

AI summary

A climate control system of a vehicle includes an evaporator, a first blower, and a first blower passageway that receives air blown from the first blower. The system also includes a second blower and a second blower passageway that receives air blown from the second blower and that is fluidly independent of the first blower passageway. The system further includes a ducting assembly defining a common passageway that receives air from both the first and second blower passageways. The first and second blowers are configured to operate in parallel to deliver air to the common passage and across the evaporator.