Ground Loop Bypass Control for Idle-Period Heat Transfer Loss

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Solution Overview

Problem

Existing ground source heating systems consume significant energy to maintain continuous fluid circulation, which can lead to counterproductive heat transfer when the ground loop is not at a desirable temperature, wasting energy and increasing operational costs.

Innovation Solution

Incorporating a bypass mechanism that diverts fluid from the ground loop to the building loop during off-peak times, reducing energy consumption and preventing unwanted heat gain or loss by switching between normal and bypass modes based on temperature data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the fluid pump operates continuously to maintain even flow through the entire system, then the system is ready to provide heating or cooling when needed, but significant energy is consumed and unwanted heat transfer may occur during idle periods

Engineering Contradiction:

Improvesystem readinessVSAvoidpump energy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically switches between two operational modes: normal mode where fluid circulates through the ground loop, and bypass mode where fluid is diverted directly from the building loop back to the building loop. This dynamic switching allows the system to adapt to varying conditions and eliminate unnecessary energy consumption during idle periods while maintaining readiness when heating or cooling is needed.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The bypass mechanism allows different portions of the fluid circulation system to have different flow characteristics. During bypass mode, fluid in the building loop is diverted away from the ground loop, creating localized different flow paths. This enables the system to maintain fluid circulation and readiness in the building loop while avoiding energy-wasting circulation through the ground loop when not needed.

Inventive Principle:

Principle #3Local quality

2Reliability

If the fluid pump operates continuously to maintain even flow through the entire system, then heat exchange can occur when needed, but the pump may move heat in the wrong direction when the ground loop is not at a desirable temperature

Engineering Contradiction:

Improveheat exchange capabilityVSAvoidcounterproductive heat transfer

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The system uses dynamic mode switching to prevent counterproductive heat transfer. When the ground loop is not at a desirable temperature for heat exchange, the system transitions to bypass mode, dynamically redirecting fluid flow away from the ground loop. This prevents the pump from moving heat in the wrong direction while maintaining the capability to perform heat exchange when conditions are appropriate.

Inventive Principle:

Principle #15Dynamics

3Use of energy by moving object

If variable-speed drives are installed to reduce pump speed during idle periods, then energy is saved, but the pump must still run at minimum speed to maintain heat capacity availability

Engineering Contradiction:

Improvepump energy consumptionVSAvoidheat capacity availability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The bypass mechanism extracts the unnecessary portion of fluid circulation from the system during idle periods. Instead of requiring the pump to maintain minimum speed through the entire system including the ground loop, the bypass diverts fluid directly from the building loop back to the building loop, eliminating the need for ground loop circulation when heat exchange is not needed. This reduces energy consumption while maintaining heat capacity availability in the building loop.

Inventive Principle:

Principle #2Taking out (Extraction)

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 approach significantly reduces energy consumption and minimizes counterproductive thermal transfer, achieving a more efficient ground source heating system by allowing the pump to operate at lower speeds and preventing heat loss or gain during idle periods.

Implementation Method 1

Within the building loop, the transfer fluid is pumped through a heat exchanger where heat is extracted and used in the building

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

The fluid is also pumped through underground pipes of the ground loop where it absorbs more heat and carries it back into the building

Methodology Applied

Scientific EffectHeat absorption: Conduction (thermal)

Data Source

PatentUS9285140B2Ground loop bypass for ground source heating or cooling

Publication Date: 2016.03.15 MELINK SOLAR & GEO INC

AI summary

A ground source heat transfer system circulates transfer fluid between heat exchange units and a ground loop. The system includes a bypass which allows the transfer fluid to continue to circulate past the exchange units while bypassing the ground loop. Monitoring the conditions of the system with temperature sensors allows the system to selectively activate the bypass whenever diverting fluid away from the ground loop can save heat or energy.