Dynamic Compressor Delay Control for HVAC Demand Response
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Solution Overview
Problem
Conventional HVAC systems lack a simple method to create asymmetrical thermal waveforms without complex programming, and users are not provided with a means to adjust compressor delays accessible outside the unit, which can lead to rapid cycling and increased energy consumption.
Innovation Solution
A networked HVAC control system that dynamically adjusts compressor delays based on weather conditions and electricity demand, allowing users to participate in demand response programs without affecting comfort, using a thermostat connected to a server that manages setpoint changes and calculates optimal thermal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed compressor delay is implemented to prevent rapid cycling, then system reliability is improved, but energy consumption increases due to extended off-periods
Solution Approach 1:
The patent implements a dynamic compressor delay system that adjusts the delay period based on real-time weather conditions and electricity demand signals. The delay timer transitions from a fixed value to a variable parameter that can be extended or reduced automatically, allowing the system to maintain compressor protection while adapting to changing operational conditions to minimize energy consumption.
Solution Approach 2:
The system changes the parameter of compressor delay duration based on external conditions. When demand response signals are received or weather conditions warrant it, the compressor delay parameter is dynamically adjusted, transforming a static protection mechanism into an adaptive control parameter that balances reliability with energy efficiency.
2Use of energy by moving object
If demand response programs are implemented to reduce peak load, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
The patent introduces a server as an intermediary that handles the complex demand response logic and communication protocols. The thermostat itself remains relatively simple, while the server manages the sophisticated algorithms for analyzing weather data, electricity signals, and generating appropriate compressor delay adjustments, thereby distributing system complexity to a centralized intelligent platform.
Solution Approach 2:
The system integrates multiple functions into a unified demand response framework: it processes weather data, interprets electricity demand signals, calculates optimal delay periods, and communicates with the HVAC system all through a single server platform. This multi-functional approach consolidates complexity rather than distributing it across multiple separate components.
3Productivity
If compressor delay is extended during peak demand, then productivity of demand response is improved, but thermal comfort may be impacted
Solution Approach 1:
The system continuously monitors thermal conditions and uses feedback to ensure that compressor delay adjustments do not compromise comfort. The server analyzes the impact of extended delays on indoor temperature and can modify subsequent delay decisions based on observed thermal performance, creating a closed-loop control system that balances demand response goals with comfort requirements.
Solution Approach 2:
The patent applies partial compressor delay extension rather than complete system shutdown during demand response events. By implementing delayed compressor startup rather than full system failure, the system achieves meaningful demand response contribution while maintaining partial HVAC functionality to preserve thermal comfort, avoiding the extremes of either no delay or complete system cessation.
Data Source
AI summary
Systems and methods are disclosed for reducing the usage of a ventilation system. For example, one or more of the exemplary systems comprise a thermostatic controller that has at least two settings for the delay occurring between turning the ventilation system off and then turning the system back on. One setting being for a first interval and at least a second setting for a second interval that is longer than the first interval. A processor is in communication with the thermostatic controller and is configured to evaluate one or more parameters including at least the temperature outside the structure conditioned by the ventilation system. The processor is further configured to determine whether to adopt the first interval or the second interval based upon the values of the parameters.