Heat Pump Condensation Dryer Cooling for Impermissible State Detection
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Solution Overview
Problem
Condensation dryers with heat pumps face challenges in detecting impermissible operating states, such as high temperatures and air circulation issues, which can lead to refrigerant liquefaction problems and energy inefficiencies, making it difficult to maintain optimal heat pump operation and prevent damage to components.
Innovation Solution
A condensation dryer equipped with a heat pump that includes a temperature sensor to monitor refrigerant temperature, a cooling device with an additional heat exchanger, and a controller to switch on cooling when the refrigerant temperature exceeds a limit, along with a method to evaluate temperature changes and display impermissible operating states using visual and acoustic indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heat pump is used to reduce energy loss in condensation dryers, then energy efficiency is improved, but the risk of impermissible operating states (high temperature, refrigerant liquefaction) increases
Solution Approach 1:
The temperature sensor monitors refrigerant temperature in advance, and the controller activates the cooling device before the refrigerant temperature reaches dangerous levels, preventing impermissible operating states from occurring in the first place
Solution Approach 2:
The system continuously monitors refrigerant temperature via the temperature sensor and adjusts the cooling device operation based on real-time temperature data, creating a closed-loop control system that maintains reliable operation while maximizing energy efficiency
2Device complexity
If refrigerant temperature is not monitored, then device complexity is reduced, but damage to heat pump components may occur
Solution Approach 1:
A temperature sensor is introduced as an intermediary measurement device that indirectly monitors refrigerant temperature without disrupting the refrigerant flow or requiring direct contact with high-pressure refrigerant, thereby protecting components while enabling monitoring
Solution Approach 2:
The system replaces complex mechanical temperature monitoring mechanisms with electronic temperature sensors and digital control, simplifying the monitoring system while enabling precise temperature detection and automated response
3Temperature
If cooling device is always active, then refrigerant temperature control is improved, but energy consumption increases
Solution Approach 1:
The cooling device operates periodically rather than continuously, being activated only when the temperature sensor detects that refrigerant temperature approaches the threshold for impermissible operating states, thereby reducing unnecessary energy consumption while maintaining effective temperature control
Solution Approach 2:
The cooling device operation is dynamically adjusted based on real-time refrigerant temperature conditions, transitioning between active and inactive states as needed to maintain optimal refrigerant temperature without wasting energy during normal operating conditions
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 solution allows for the reliable detection and display of impermissible operating states, ensuring the heat pump operates within optimal conditions, reducing energy loss, and protecting the dryer components, thereby achieving a favorable energy balance and preventing damage.
Implementation Method 1
a temperature sensor for measuring a temperature TK of the refrigerant
Implementation Method 2
a cooling device for the heat pump... Additional heat exchangers for cooling the heat pump circuit are arranged in the cooling air duct
Implementation Method 3
a compressor, a condenser and a throttle... the vaporized, gaseous refrigerant passes via a compressor to the heat source
Implementation Method 4
where due to Condensation of the gaseous refrigerant releases heat that is used to heat the process air
Implementation Method 5
the throttle is used to reduce the internal pressure in the refrigerant so that it can evaporate in the evaporator
Implementation Method 6
the refrigerant evaporating in the heat sink... the liquefied refrigerant finally flows back to the evaporator through a restrictor
Data Source
Figure 1
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AI summary
The invention relates to a condensation dryer 1 with a drying chamber 3 for the objects to be dried, a process air circuit 2, a first fan 19 in the process air circuit 12, a heat pump 13, 14, 15, 17 in which a coolant circulates, an evaporator 13, a compressor 14, a condenser 15 and a throttle 17 as well as a temperature sensor 22 for measuring a temperature of the coolant, a cooling device 16, 20 for the heat pump 13, 14, 15, 17 and a controller 10, wherein first means 26 are provided for comparing, by way of a limit temperature T? lim stored in the controller 10, a temperature T? of the coolant measured by the temperature sensor 22, and for operating the cooling device 16, 20 when T? = T? lim for a time period ?t, and second means 27 are provided for evaluating a change of the temperature T? in time period ?t to see if an unallowable operating state exists. The invention further relates to a method for operating the condensation dryer.