Pressure Exchanger Control for Refrigeration and Heat Pump Energy Use
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Solution Overview
Problem
Conventional refrigeration and heat pump systems inefficiently use pumps and compressors to increase and decrease fluid pressure, leading to high energy consumption and waste.
Innovation Solution
Implementing a pressure exchanger (PX) to exchange pressure between fluids at different pressures, coupled with a motor and controller to adjust operating conditions and reduce energy consumption by recovering and transferring energy within the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If pumps and compressors are used to increase fluid pressure in conventional refrigeration and heat pump systems, then fluid pressure is increased, but energy consumption increases significantly
Solution Approach 1:
The patent combines the compressor and expansion valve functions into a single pressure exchanger device. The high-pressure fluid from the condenser directly pressurizes the low-pressure fluid from the evaporator through hydraulic coupling, eliminating the need for separate compression and expansion components. This merging reduces energy consumption by recovering pressure energy that would otherwise be lost during expansion.
Solution Approach 2:
The patent converts the waste energy from high-pressure fluid expansion into useful work. Instead of dissipating pressure energy through traditional expansion valves, the system uses the expanding high-pressure fluid to directly drive and pressurize the low-pressure fluid stream, transforming what would be energy waste into a beneficial pressurization source.
2Use of energy by moving object
If pressure exchanger is implemented to exchange pressure between fluids, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
The pressure exchanger performs multiple functions simultaneously: it acts as a compressor for the low-pressure fluid, an expansion valve for the high-pressure fluid, and a heat exchanger. This multi-functionality reduces the number of separate components needed in the system, offsetting the complexity of the pressure exchanger itself with the elimination of other components.
Solution Approach 2:
The pressure exchanger is designed to be self-regulating through hydraulic coupling. The system automatically balances pressure exchange between the two fluid streams without requiring external control mechanisms, reducing the need for additional control devices and simplifying the overall system architecture.
3Adaptability or versatility
If pressure exchanger with motor and controller is used to optimize fluid flow, then operational flexibility is enhanced, but device complexity increases
Solution Approach 1:
The patent incorporates a motor and controller that enable dynamic adjustment of the pressure exchanger operating parameters. The system can adapt to varying load conditions, temperature requirements, and fluid flow rates by dynamically adjusting motor speed and control valve positions, providing operational flexibility for different operating scenarios.
Solution Approach 2:
The controller receives feedback from sensors monitoring pressure, temperature, and flow rates throughout the system. This feedback enables the controller to automatically adjust motor operation and control valve positions to optimize system performance, maintaining desired operating conditions while providing adaptability to changing loads and environmental conditions.
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
Reduces energy consumption, extends component lifespan, and enhances operational flexibility by optimizing fluid flow and pressure exchange, allowing for more efficient temperature control and component protection.
Implementation Method 1
The PX is configured to exchange pressure between a first fluid and a second fluid
Data Source
Figure 1A~1B
Figure 2A
Figure 2B~2E
AI summary
A system includes a pressure exchanger (PX). The PX is coupled to a motor that controls an operating speed of the PX. The system further includes a first pressure gauge configured to generate first pressure data indicative of a pressure of a fluid of a condenser. A first controller is to generate a first control signal based on the first pressure data. The motor of the PX is configured to adjust the operating speed of the PX based on the first control signal. The system further includes a pump. The system further includes a fluid density sensor for generating fluid density data associated with a first output fluid of the PX. A second controller is to generate a second control signal based on at least the fluid density data. The pump is to adjust an operating speed of the pump based on the second control signal.