Temperature regulating refrigeration systems for varying loads

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Solution Overview

Problem

Refrigeration systems face inefficiencies when thermal loads vary, leading to reduced compressor speed and lubrication issues, compromising system efficiency and temperature control.

Innovation Solution

Incorporating a controllable bypass valve and control circuit to artificially increase system load by redirecting refrigerant fluid, maintaining compressor speed above a threshold, and using a combination of bypass and expansion valves to regulate temperature across varying loads.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If compressor speed is reduced to match varying thermal loads, then energy consumption decreases, but compressor lubrication deteriorates and system efficiency drops

Engineering Contradiction:

Improvecompressor energy consumptionVSAvoidcompressor lubrication

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The system dynamically adjusts the bypass valve position based on real-time compressor speed and thermal load conditions. The bypass valve opens to redirect refrigerant when compressor speed drops below threshold, maintaining optimal lubrication flow dynamically rather than using a fixed configuration

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The bypass valve acts as an intermediary component that introduces additional refrigerant flow into the system when needed. This intermediary mechanism allows the system to maintain compressor lubrication without directly increasing the primary thermal load, resolving the contradiction between energy efficiency and lubrication requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If bypass valve redirects refrigerant to increase artificial load, then compressor speed is maintained above threshold, but system temperature control complexity increases

Engineering Contradiction:

Improvecompressor speedVSAvoidtemperature control system complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The control circuit continuously monitors compressor speed and thermal load conditions, using feedback signals to automatically adjust bypass valve position. This closed-loop feedback system maintains compressor speed above threshold while managing temperature control complexity through automated regulation rather than manual intervention

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The bypass valve system serves multiple functions: maintaining compressor speed, managing lubrication flow, and assisting temperature control. This multi-functionality reduces overall system complexity by consolidating control mechanisms into a single integrated solution rather than requiring separate systems for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If fixed speed compressor is used to maintain stable operation, then compressor reliability improves, but adaptability to varying thermal loads deteriorates

Engineering Contradiction:

Improvecompressor stable operationVSAvoidresponse to varying thermal loads

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The refrigerant flow is segmented into two paths: the primary path through the thermal load and the bypass path through the bypass valve. This segmentation allows the fixed-speed compressor to maintain stable operation while the bypass path provides adaptability to varying thermal loads by redirecting refrigerant flow as needed

Inventive Principle:

Principle #1Segmentation

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

Ensures precise temperature control and maintains system efficiency by preventing compressor speed drops, reducing lubrication issues, and expanding the operational range of cooling power from 25% to 100% without expensive variable valves.

Implementation Method 1

redirecting refrigerant fluid

Methodology Applied

Scientific EffectFluid flow redirection:

Implementation Method 2

using a combination of bypass and expansion valves to regulate temperature

Methodology Applied

Scientific EffectPhase change: Phase Change

Implementation Method 3

an evaporator in thermal communication with both the refrigerant loop and the coolant loop

Methodology Applied

Scientific EffectHeat transfer: Heat Exchanger

Data Source

PatentUS12352482B2Temperature regulating refrigeration systems for varying loads

Publication Date: 2025.07.08 TARK THERMAL SOLUTIONS INC

AI summary

A refrigeration system includes a compressor, a condenser, a heat transfer component, and a refrigerant loop arranged to allow a flow of a refrigerant fluid. The compressor, the condenser, and the heat transfer component are connected in the refrigerant loop. The system further includes a bypass path extending between an output side of the compressor in the refrigerant loop and an input side of the heat transfer component in the refrigerant loop. A bypass valve is connected in the bypass path. A control circuit is in communication with the bypass valve. The control circuit is configured to open the bypass valve to allow the refrigerant fluid to pass to the heat transfer component thereby increasing the refrigerant fluid provided to the heat transfer component and artificially increasing a load on the refrigeration system. Other examples refrigeration system and examples methods are also disclosed.