Method for sequencing compressor operation based on space humidity
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Solution Overview
Problem
HVAC systems face inefficiencies in compressor sequencing, leading to suboptimal operation in managing temperature and humidity, particularly in balancing cooling and dehumidification demands.
Innovation Solution
A multi-circuit refrigeration system with a control panel that sequences compressors between balanced and clustered modes based on humidity inputs, optimizing compressor operation to enhance efficiency and reduce costs by considering compressor parameters like start count, operational time, and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If compressors are sequenced using traditional methods, then the system structure is simple, but the energy efficiency and operational optimization are insufficient
Solution Approach 1:
The control system performs preliminary sequencing of compressors based on operational parameters (start count, operational time, capacity) before actual cooling or dehumidification cycles begin. This pre-planned sequencing optimizes energy efficiency by determining the most efficient compressor combinations in advance, rather than reacting to conditions in real-time, thus improving energy use without requiring complex real-time control mechanisms.
Solution Approach 2:
The system dynamically adjusts compressor sequencing between two modes: balanced mode (energizing compressors from both circuits alternately) and clustered mode (energizing all compressors from one circuit before switching to the other). This dynamic adaptation to different operational conditions (cooling vs. dehumidification) allows the system to optimize energy efficiency for each specific scenario while maintaining manageable control complexity through predefined mode transitions.
2Productivity
If compressors operate without optimized sequencing, then the control logic is simple, but the cooling and dehumidification performance is suboptimal
Solution Approach 1:
The multi-circuit refrigeration system divides compressors into separate circuits (first circuit with first plurality of compressors, second circuit with second plurality of compressors), each capable of independent operation. This segmentation allows the control system to select between balanced mode (using both circuits) and clustered mode (using one circuit at a time), optimizing productivity for different environmental conditions while keeping individual circuit control logic relatively simple.
Solution Approach 2:
The system changes operational parameters by switching between balanced and clustered compressor modes based on humidity sensor input. When dehumidification is prioritized, the system transitions to clustered mode to maximize refrigerant circulation in one circuit. When cooling is prioritized, it uses balanced mode to distribute load across both circuits. This parameter change approach optimizes cooling and dehumidification efficiency without requiring complex control algorithms.
3Speed
If compressors are energized simultaneously, then the system response is fast, but the operational costs and energy consumption increase
Solution Approach 1:
The system applies partial action by energizing only the necessary number of compressors based on the selected mode and current cooling/dehumidification demands, rather than running all compressors simultaneously. In clustered mode, all compressors in one circuit are energized; in balanced mode, compressors are distributed across circuits. This partial action approach maintains adequate system response speed while avoiding the excessive energy consumption that would result from running all compressors at full capacity simultaneously.
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
The system achieves efficient cooling and dehumidification by optimizing compressor sequencing, maintaining desired temperature and humidity levels while reducing energy consumption and operational costs.
Implementation Method 1
A multi-circuit refrigeration system with a control panel that sequences compressors between balanced and clustered modes based on humidity inputs
Implementation Method 2
Each compressor of the first plurality of compressors is configured to compress a first gaseous refrigerant into a first compressed refrigerant
Implementation Method 3
The fluid flowing within the closed loop is generally formulated to undergo phase changes within the normal operating temperatures and pressures of the system so that quantities of heat can be exchanged by virtue of the latent heat of vaporization of the fluid
Implementation Method 4
HVAC systems may circulate a fluid, such as a refrigerant, through a closed loop between an evaporator where the fluid absorbs heat and a condenser where the fluid releases heat
Implementation Method 5
quantities of heat can be exchanged by virtue of the latent heat of vaporization of the fluid
Data Source
AI summary
A multi-circuit refrigeration system includes a first plurality of compressors, a second plurality of compressors, and a control panel. The control panel is configured to receive an input related to humidity from a humidity sensor or humidistat. Based on the input, the control panel is configured to sequence operation of the first plurality of compressors and the second plurality of compressors between a balanced mode and a clustered mode. In the balanced mode, a first compressor of the first plurality of compressors and a first compressor of second plurality of compressors are energized before a second compressor of the first plurality of compressors or a second compressor of the second plurality of compressors is energized. In the clustered mode, the first compressor and the second compressor of the first plurality of compressors are energized before the first compressor or the second compressor of the second plurality of compressors is energized.