Heat Pump Dryer Compressor Power Profiling for Ambient-Adaptive Drying
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Solution Overview
Problem
Existing laundry treatment apparatuses with heat pump systems face inefficiencies in drying performance due to inadequate adaptation of compressor operation to ambient and internal temperature conditions, leading to prolonged drying cycles and potential overheating issues.
Innovation Solution
A method for operating a laundry treatment apparatus with a heat pump system that involves detecting temperature signals from multiple locations within the apparatus and environment, applying predetermined speed and power profiles based on these readings to optimize compressor operation, and maintaining these profiles throughout the drying cycle without continuous adaptation, thereby ensuring efficient and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor operates at high power continuously, then the drying speed is improved, but energy consumption increases and overheating risk occurs
Solution Approach 1:
The compressor operates at high power only during the initial phase when temperature conditions require it, then dynamically switches to low power operation. This dynamic adjustment of compressor power based on temperature signals optimizes drying speed initially while reducing energy consumption during sustained operation.
Solution Approach 2:
The system performs preliminary high-power compression at the start of the drying cycle to quickly establish appropriate temperature conditions, then transitions to low-power operation. This preliminary action achieves the necessary drying conditions without sustaining high energy consumption throughout the entire cycle.
2Productivity
If the compressor operates at high power continuously, then the drying speed is improved, but overheating of the apparatus occurs
Solution Approach 1:
The compressor power is dynamically adjusted based on real-time temperature signals from multiple locations. High power is applied only when and where needed to maintain drying speed, while low power operation prevents overheating in temperature-sensitive areas of the apparatus.
Solution Approach 2:
Different regions of the apparatus receive different levels of thermal input based on their specific temperature requirements. The compressor power is modulated to provide localized heating where needed for drying while preventing overheating in other areas, creating non-uniform temperature distribution optimized for both drying performance and safety.
3Use of energy by moving object
If the compressor power is reduced to save energy, then energy efficiency is improved, but drying cycle duration increases
Solution Approach 1:
The system applies high compressor power at the beginning of the drying cycle to quickly establish effective drying conditions, then transitions to low power operation. This preliminary high-power phase reduces the overall drying time while the subsequent low-power phase maintains energy efficiency, achieving both goals simultaneously.
Solution Approach 2:
The compressor operates in periodic cycles of high and low power modes rather than continuous operation at a single power level. This periodic action allows the system to achieve drying objectives during high-power phases while minimizing energy consumption during low-power phases, reducing both time and energy costs.
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 results in improved drying performance by optimizing compressor operation based on initial conditions, reducing drying cycle duration, and preventing overheating, thus enhancing energy efficiency and operational reliability.
Implementation Method 1
The apparatus comprises a heat pump system and a laundry treatment chamber for treating laundry using process air. The heat pump system comprises: a first heat exchanger (evaporator) for heating a refrigerant fluid, a second heat exchanger (condenser) for cooling the refrigerant fluid, an expansion device and a refrigerant loop, in which the refrigerant fluid is circulated through the first and second heat exchangers and the expansion device
Implementation Method 2
A compressor is provided which is adapted to operate at variable speed and additionally or alternatively at variable power for circulating the refrigerant fluid through the refrigerant loop
Data Source
Figure 1~2
Figure 3
Figure 4~8
AI summary
The invention relates to a laundry treatment apparatus (2), in particular a heat pump dryer or washing machine having dryer function, and to a method for operating the apparatus, wherein the apparatus (2) comprises a heat pump system (4) and a laundry treatment chamber (18) for treating laundry using process air (A), and wherein the heat pump system comprises a first heat exchanger (10) for heating a refrigerant fluid (R), a second heat exchanger (12) for cooling the refrigerant fluid (R), an expansion device (16), a refrigerant loop (6), in which the refrigerant fluid is circulated through the first and second heat exchangers and the expansion device, and a variable speed and/or variable power compressor (14) for circulating the refrigerant fluid (R) through the refrigerant loop (6), the method comprising the steps of detecting at least one temperature signal, selecting a predetermined speed and/or power profile for operating the compressor (14) in dependency of the at least one detected temperature signal, and starting to operate the compressor (14) in a laundry drying cycle by applying or executing the selected predetermined speed and/or power profile to the compressor (14) during the drying cycle in dependency of the at least one detected temperature signal.