Clothes Dryer Heat Pump Control with Heater Preheating
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Solution Overview
Problem
Conventional clothes dryers with heat pump systems face challenges in reducing dry time duration while minimizing energy consumption, particularly in low ambient temperatures, leading to increased dry time and performance deterioration.
Innovation Solution
A clothes dryer system that adjusts the operation of a heat pump and heater based on the temperature of air passing through the drum and the compressor, using sensors and a processor to optimize energy use and reduce dry time, including features like reversing drum rotation and adjusting compressor frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the compressor RPM is increased to rapidly create high-temperature air, then the dry time duration is shortened, but the power consumption increases
Solution Approach 1:
The heater pre-heats the air before it enters the drum, creating a head start for the drying process. This preliminary heating action reduces the burden on the compressor to rapidly raise temperatures, thereby shortening dry time without requiring excessive compressor power consumption.
Solution Approach 2:
The system dynamically adjusts the heater operation based on compressor temperature and ambient conditions. By changing the heating parameters (when to heat, how much to heat) based on real-time temperature measurements, the system optimizes the balance between rapid drying and energy consumption.
2Adaptability or versatility
If the heat pump system operates in low ambient temperature conditions, then the system can maintain operation, but the time required to create hot air increases
Solution Approach 1:
The heater provides preliminary heating to compensate for low ambient temperatures. By pre-heating the air before it enters the drum, the system overcomes the adverse effect of cold ambient conditions without waiting for the heat pump to slowly warm up the entire space.
Solution Approach 2:
The heater acts as an intermediary element that bridges the gap between low ambient temperatures and the required drying temperature. Instead of relying solely on the heat pump to handle the full temperature rise from cold ambient conditions, the heater mediates by providing initial heating support.
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 effectively shortens dry time while preventing damage to clothes and minimizing energy consumption, maintaining efficient drying performance across varying temperatures.
Implementation Method 1
a compressor configured to compress a refrigerant
Implementation Method 2
a condenser configured to condense the refrigerant
Implementation Method 3
a heater configured to heat air supplied to an interior of the drum
Data Source
AI summary
A clothes dryer is disclosed. The clothes dryer includes a rotatably disposed drum, a heat pump system including a compressor configured to compress a refrigerant and a condenser configured to condense the refrigerant, a heater configured to heat air supplied to the interior of the drum, a first temperature sensor configured to detect a temperature of air passing through the interior of the drum, a second temperature sensor configured to detect a temperature of the compressor, and a processor configured to control an operation of the compressor on the basis of the temperature of the air passing through the interior of the drum detected by the first temperature sensor and control an operation of the heater on the basis of the temperature of the compressor detected by the second temperature sensor.