Climate-control system having pump
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Solution Overview
Problem
Climate-control systems, such as heat-pump and refrigeration systems, face inefficiencies in operating effectively and efficiently across varying ambient temperatures, particularly in maintaining consistent pressure and temperature conditions to avoid excessive expansion device hunting.
Innovation Solution
The climate-control system incorporates a dual working-fluid circuit with a first and second heat exchanger, a first and second pump, and a control module with a pressure sensor. The first pump circulates the first working fluid through the first working-fluid circuit, and the second pump circulates a second working fluid through the second working-fluid circuit, which is thermally coupled with the first. The control module operates the first pump based on pressure readings to maintain optimal conditions, avoiding hunting of expansion devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single working-fluid circuit is used, then the system structure is simple, but the system cannot maintain consistent pressure and temperature conditions across varying ambient temperatures, leading to expansion device hunting
Solution Approach 1:
The system divides the working fluid circuit into two separate circuits (first working-fluid circuit and second working-fluid circuit), each with its own pump, heat exchangers, and expansion devices. This segmentation allows independent control of pressure and temperature in each circuit, enabling consistent operating conditions across varying ambient temperatures and preventing expansion device hunting.
2Reliability
If the first pump operates continuously to maintain optimal pressure conditions, then pressure stability is improved, but power consumption increases
Solution Approach 1:
The control module dynamically controls the operation of the first pump based on real-time pressure readings from the pressure sensor. The pump operates in an ON-mode when pressure drops below optimal levels and can be turned off when pressure is sufficient, particularly during charge mode when ambient temperature is below 60°F. This dynamic control maintains pressure stability while minimizing unnecessary power consumption.
Solution Approach 2:
The system implements a feedback control mechanism where the pressure sensor continuously monitors the pressure of the first working fluid and provides feedback to the control module. The control module adjusts the first pump's operation based on this feedback, turning the pump on or off to maintain optimal pressure conditions, thereby balancing pressure stability with energy efficiency.
3Adaptability or versatility
If the climate-control system operates in both charge and discharge modes with dual circuits, then operational versatility is improved, but system complexity increases
Solution Approach 1:
The dual working-fluid circuit system is designed to perform multiple functions: it can operate in charge mode (when ambient temperature is below 60°F) and discharge mode (when ambient temperature is above 60°F). The first and second working-fluid circuits can be independently or jointly controlled to achieve different operational modes, providing operational versatility while managing complexity through unified control logic in the control module.
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 enhances the system's efficiency by maintaining consistent operating conditions, reducing power consumption, and allowing operation in both charge and discharge modes, especially at ambient temperatures below 60 degrees Fahrenheit, thereby optimizing energy use and reducing expansion device hunting.
Implementation Method 1
The first heat exchanger is thermally coupled with the first working-fluid circuit and the second working-fluid circuit
Implementation Method 2
The first pump receives a first working fluid from the second heat exchanger and circulates the first working fluid through the first working-fluid circuit
Implementation Method 3
The second pump is in fluid communication with the fourth heat exchanger
Implementation Method 4
a first compressor, a second heat exchanger and a first pump. The second heat exchanger is in fluid communication with the first compressor
Data Source
AI summary
A climate-control system includes a first working-fluid circuit, a second working-fluid circuit and a first heat exchanger. The first working-fluid circuit includes a first compressor, a second heat exchanger and a first pump. The second heat exchanger is in fluid communication with the first compressor. The first pump receives a first working fluid from the second heat exchanger and circulates the first working fluid through the first working-fluid circuit. The second working-fluid circuit is fluidly isolated from the first working-fluid circuit and includes a second pump and a fourth heat exchanger. The second pump is in fluid communication with the fourth heat exchanger. The first heat exchanger is thermally coupled with the first working-fluid circuit and the second working-fluid circuit.