Heat Pump Dryer Blower Control for Ambient Temperature Shifts
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Solution Overview
Problem
Laundry drying machines face inefficiencies in energy consumption and moisture condensation issues due to fixed fan control temperature thresholds, which are not adaptive to varying ambient temperatures, leading to prolonged drying cycles and potential damage from condensation on electronic components at low temperatures.
Innovation Solution
A method that dynamically adjusts cooling air blower control thresholds based on ambient temperature, maintaining the blower deactivated during initial drying periods to conserve energy and activating it earlier to prevent condensation, ensuring optimal drying performance across temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed fan control temperature thresholds are used, then the device complexity is reduced, but the adaptability to varying ambient temperatures deteriorates
Solution Approach 1:
The patent implements dynamic fan control by adjusting the temperature thresholds based on ambient temperature conditions. The control unit modifies the activation and deactivation thresholds of the cooling fan according to the detected ambient temperature, making the control system adaptive rather than static. This resolves the contradiction by introducing dynamics that allow the simple fixed-threshold system to adapt to varying environmental conditions.
Solution Approach 2:
The patent changes the control parameters (temperature thresholds) based on ambient temperature conditions. When ambient temperature is low, the activation threshold is lowered and deactivation threshold is raised; when ambient temperature is high, the activation threshold is raised and deactivation threshold is lowered. This parameter adjustment strategy allows the system to maintain optimal performance across different ambient conditions without increasing structural complexity.
2Reliability
If the cooling fan is switched on early to prevent overheating, then the reliability of the heat pump system is improved, but the energy consumption increases
Solution Approach 1:
The patent dynamically adjusts the fan control temperature thresholds based on ambient temperature to optimize the balance between reliability and energy consumption. By lowering the activation threshold in cold environments and raising it in hot environments, the system ensures the heat pump remains reliable while avoiding unnecessary fan operation that would waste energy. This adaptive parameter adjustment resolves the contradiction by making the energy consumption proportional to actual cooling needs.
Solution Approach 2:
The control unit continuously monitors ambient temperature and adjusts fan control thresholds accordingly, creating a feedback mechanism that optimizes energy usage. The system receives feedback about environmental conditions and modifies its operation to maintain reliability only when necessary, thereby reducing energy consumption during periods when cooling is not critically needed.
3Use of energy by moving object
If the cooling fan is switched off late to conserve energy, then the energy consumption is reduced, but the compressor may overheat causing system failure
Solution Approach 1:
The patent adjusts the fan deactivation threshold dynamically based on ambient temperature. In cold conditions, the deactivation threshold is raised to ensure the fan runs longer and cools the compressor adequately. In hot conditions, the deactivation threshold is lowered to prevent compressor overheating. This adaptive approach ensures reliability is maintained while minimizing energy waste.
4Reliability
If the cooling fan operates continuously to prevent condensation, then the reliability of electronic components is improved, but the energy consumption increases
Solution Approach 1:
The patent implements ambient temperature-based threshold adjustment to balance condensation prevention with energy conservation. By dynamically setting the fan activation and deactivation thresholds according to ambient conditions, the system provides adequate ventilation to prevent condensation on electronic components only when necessary, rather than operating continuously. This resolves the contradiction by making protection proportional to environmental risk.
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 energy efficiency and prevents moisture condensation on machine components, ensuring reliable operation and faster drying cycles by adapting to ambient conditions.
Implementation Method 1
a first heat exchanger (evaporator) for heating a refrigerator fluid, a second heat exchanger (condenser) for cooling the refrigerant fluid
Implementation Method 2
designed to generate and circulate inside the drying drum, heated processing air
Implementation Method 3
a cooling air blower, which carries off heat from one or more parts of the heat pump system, precisely from the compressor or from an auxiliary condenser, by means of ambient air
Implementation Method 4
a refrigerant loop, in which the refrigerant fluid is circulated through the first and second heat exchangers and the expansion device
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The present invention relates to a method for operating a laundry treatment apparatus (1), wherein the apparatus (1) comprises: a laundry treatment chamber (3) for treating laundry by using processing air (A); a heat pump system (4) for treating said processing air (A); a cooling air blower (24) for blowing ambient air towards the heat pump system (4) to cool at least a part thereof; at least one temperature sensing device for providing a first signal indicative of ambient temperature (Tamb); a heat pump system (4) operating condition detection unit for providing a second signal (Tr) indicative of an operating condition of the heat pump system (4); the method comprising the steps of: providing an ambient temperature threshold (TaTHR); determining the ambient temperature (Tamb) based on the first signal; determining whether the ambient temperature (Tamb) satisfies a prefixed condition with the ambient temperature threshold (TaTHR), performing a cooling air blower (24) control procedure based on the second signal (Tr). If said prefixed condition is determined, performing the steps of: drying laundry for a first drying period (t1); determining the second signal (Tr(tl)) at the end of the first drying period (t1); and, based on said determined second signal (Tr(tl)), providing control thresholds (TfON)(TfOFF) for said second signal (Tr) to control said cooling air blower (24) during a second drying period (t2) next to said first drying period (t1).