Two-Stage Heat Pump Compressor Overdrive for Low-Temperature Heating
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Solution Overview
Problem
Climate control systems face challenges in delivering adequate heating capacity in very low temperature environments, as existing compressors often operate at or near their rated limits, leading to inefficient performance and the need for oversized systems which result in poor performance and increased costs.
Innovation Solution
The system increases the power frequency to the compressor to over-speed it beyond its rated speed, providing an elevated third-stage capacity by modifying the power input frequency from the rated frequency to an increased frequency, allowing the compressor to operate at elevated heating capacity without the need for larger compressors or variable drive systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor is operated at its rated capacity to deliver heating in very low temperature environments, then the heating capacity is maintained within rated limits, but the system performance becomes inefficient and inadequate
Solution Approach 1:
The patent changes the electrical parameters supplied to the compressor motor by increasing the power frequency above the rated frequency. This parameter change allows the compressor to operate at speeds exceeding its rated speed, thereby delivering elevated heating capacity that adapts to very low temperature environmental conditions while maintaining efficient system performance
2Adaptability or versatility
If larger compressors with variable drive systems are added to improve heat pump performance, then the operating range is extended, but the system becomes oversized for most operations resulting in poor performance and excess costs
Solution Approach 1:
The patent enables a fixed-stage compressor to perform multiple functions by implementing an overdrive capability that allows operation at both rated and elevated speeds. This multi-functionality extends the operating range into very low temperature environments without requiring a larger compressor, avoiding the inefficiencies of oversized systems while maintaining cost-effectiveness
3Power
If larger compressors are used to increase heating capacity, then the rated capacity is increased, but the footprint and system costs increase
Solution Approach 1:
The patent introduces dynamic operation to a traditionally fixed-stage compressor by enabling variable speed control through increased power frequency. This allows the existing compressor to dynamically adjust its output capacity beyond rated levels, achieving elevated heating capacity without the need for larger physical equipment, thereby maintaining a compact footprint
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 enhances the compressor's deliverable heating capacity, improves overall system efficiency, and maintains performance across a wider temperature range without the drawbacks of oversized systems, such as increased costs and complexity.
Implementation Method 1
control circuitry configured to modify a power input frequency to a motor of the compressor to increase the compressor speed beyond a rated speed level
Data Source
AI summary
Examples of the present disclosure relate to systems and methods for providing an elevated third-stage of operation to a two-stage compressor of a climate control system. The first low stage and the second high stage are provided with open or closed bypass ports respectively and by operating the two-stage compressor at a rated power setting. The elevated third-stage of operation is provided by operating the two-stage compressor at the high stage with an overdrive power setting. The elevated third-stage may be enabled in heating mode and locked out in cooling mode. The two-stage compressor may be further locked out of the second high stage in cooling mode and an indoor fan may be operated at various speeds to provide additional cooling capacity. Switching between each stage of the two-stage compressor may be controlled by additional control circuitry including a plurality of relays.