Refrigeration device for container
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Solution Overview
Problem
Container refrigeration devices face challenges in ensuring uniform temperature distribution across the width direction during dehumidifying operations, leading to potential chilling injury to loads due to non-uniform heating and inaccurate temperature detection.
Innovation Solution
The device includes a refrigerant circuit with a compressor, condenser, expansion mechanism, and evaporator, along with a heating device downstream of the evaporator, where the target temperature is adjusted during operation switches from cooling to dehumidifying by setting a second preset temperature higher than the inside temperature, and temperature control is managed by sensors and control sections to maintain uniform air temperature across the container width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air is heated by the heat exchanger for heating during dehumidifying operation, then the dehumidification effect is improved, but the temperature distribution becomes non-uniform across the width direction causing chilling injury
Solution Approach 1:
The patent applies local quality by switching to a different heating configuration (heating sections at both ends) when dehumidifying operation is detected. This creates a localized heating pattern that ensures uniform temperature distribution across the width direction, preventing chilling injury while maintaining effective dehumidification. The control section detects the operation mode and adjusts the heating strategy accordingly.
2Device complexity
If the blown air temperature sensor detects temperature at a single point, then the device complexity is reduced, but the temperature measurement becomes inaccurate during dehumidifying operation
Solution Approach 1:
The control section acts as an intermediary that compensates for the single-point measurement limitation. By detecting the operation mode and adjusting the target temperature or heating strategy based on the known non-uniform heating pattern during dehumidifying operation, the system ensures accurate temperature control without requiring multiple sensors. This intermediary control logic bridges the gap between simplified sensing and precise temperature management.
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 prevents chilling injury by ensuring the lowest temperature within the container does not drop below the preset level, maintaining load safety and reducing temperature variations during dehumidification.
Implementation Method 1
the sucked air is cooled and dehumidified by the evaporator (25)
Implementation Method 2
the air that has been subjected to cooling and dehumidification in the evaporator
Implementation Method 3
the air is heated by the heating device (17)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A blown air temperature sensor (34) detects a temperature of blown air which is being blown into a container (C) after having passed sequentially through an evaporator (25) and a heating device (17). During cooling and dehumidifying operations, a temperature control section (101) controls a cooling section (18) such that a detected blown air temperature (Tss) detected by the blown air temperature sensor (34) becomes equal to a target temperature (Tx). A target control section (201) sets the target temperature (Tx) to be a first preset temperature which is equal to a preset inside temperature (Tsp) when the cooling operation is performed, and sets the target temperature (Tx) to be a second preset temperature which is sum of the preset inside temperature (Tsp) and a target increment temperature once a switch has been made from the cooling operation to the dehumidifying operation.