Method for controlling the operation of a heat pump
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Solution Overview
Problem
Existing control methods for thermofrigopumps, which simultaneously heat and cool, are inefficient and energy-intensive due to reliance on instantaneous temperature measurements, leading to frequent mode alternation and increased wear, without optimizing for combined heating and cooling demands.
Innovation Solution
A predictive control method that uses future demand estimation based on past temperature observations and setpoint comparisons, employing Boolean indicators to determine the most energy-efficient production mode, reducing the number of heat pump activations and extending component life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If control is based on instantaneous temperature measurement only, then the system responds quickly to current conditions, but the heat pump alternates frequently between heating and cooling modes, reducing energy efficiency
Solution Approach 1:
The control method performs preliminary actions by predicting future heating and cooling needs before they occur. It calculates future temperature evolution and anticipates when the heat pump will be needed, allowing the system to prepare and maintain optimal operating conditions rather than reacting to instantaneous temperature drops or rises.
Solution Approach 2:
The system implements feedback by continuously monitoring current temperature, comparing it with predicted future temperature, and adjusting the heat pump operation accordingly. This closed-loop control uses both present sensor data and forecasted conditions to make informed decisions about when and how to activate heating or cooling modes.
2Device complexity
If the heat pump operates in heating or cooling only modes to meet instantaneous demand, then the system is simple to control, but the number of heat pump activations increases, accelerating component aging
Solution Approach 1:
The control method performs preliminary actions by predicting future heating and cooling needs before they occur. It calculates future temperature evolution and anticipates when the heat pump will be needed, allowing the system to prepare and maintain optimal operating conditions rather than reacting to instantaneous temperature drops or rises.
Solution Approach 2:
The system maintains continuous useful action by keeping the heat pump running in combined heating and cooling mode when beneficial, rather than allowing it to shut down and restart frequently. This continuous operation in a stable mode reduces thermal cycling stress on components and extends equipment life.
3Use of energy by moving object
If the system prioritizes combined heating and cooling mode, then energy efficiency improves, but the control logic becomes more complex requiring future load prediction
Solution Approach 1:
The control method changes parameters by transitioning from using only current temperature measurements to using both current temperature and predicted future temperature as control parameters. This allows the system to optimize for energy efficiency by anticipating future conditions while maintaining manageable control logic through systematic prediction algorithms.
Data Source
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AI summary
Method for controlling the operation of a heat pump. Method for controlling the operation of a heat pump (10) connected to hot (22) and cold (24) buffer tanks, capable of operating according to at least one first mode of heat production only, a second of cold production only and a third of combined cold and heat production, the triggering of the different modes taking place at a given instant t as a function of the measured temperatures of the buffer tanks and at least one piece of information representative of a future need for heat or cold production for the buffer tanks.