Evaporator apparatus
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Solution Overview
Problem
Conventional refrigeration cycles face challenges in maintaining optimal superheat and temperature control in evaporator systems, leading to inefficiencies and potential damage from liquid slugging effects, while existing systems lack effective parallel control mechanisms for primary and secondary evaporator pathways.
Innovation Solution
The evaporator apparatus incorporates a primary and secondary evaporator pathway with corresponding expansion devices, a coolant circuit, and a controller to maintain target superheat and temperature, allowing independent regulation of working fluid states and ensuring a single-phase gaseous state, thereby improving cooling efficiency and reducing the risk of liquid slugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional sequential evaporator system is used, then the system structure is simple, but the temperature and superheat control precision is insufficient leading to liquid slugging risks
Solution Approach 1:
The evaporator is divided into two independent parallel pathways: a primary evaporator pathway with a primary expansion device and primary evaporator, and a secondary evaporator pathway with a secondary expansion device and secondary evaporator. Each pathway can be independently controlled to optimize temperature and superheat management, preventing liquid slugging while improving control precision
Solution Approach 2:
The system employs dynamic control mechanisms where the primary expansion device is controlled to maintain target superheat at a primary control location, while the secondary expansion device is controlled based on process fluid temperature to maintain target temperature at a coolant control location. This dynamic adjustment allows precise adaptation to varying operating conditions
2Productivity
If parallel evaporator pathways with independent control are implemented, then the cooling efficiency is improved, but the device complexity increases
Solution Approach 1:
The evaporator apparatus is segmented into functionally independent primary and secondary pathways that operate in parallel. The primary pathway handles refrigerant evaporation and superheat control, while the secondary pathway handles process fluid cooling, allowing simultaneous optimization of both functions without interference
Solution Approach 2:
The parallel pathway configuration enables the evaporator system to perform multiple functions simultaneously: the primary pathway maintains refrigerant superheat to prevent liquid slugging, while the secondary pathway provides efficient process fluid cooling. This multi-functionality improves overall cooling efficiency without requiring separate systems
3Temperature
If the secondary evaporator is used for heat exchange with process fluid, then the temperature control of the device is improved, but the working fluid state control becomes more complex
Solution Approach 1:
The control system dynamically adjusts the secondary expansion device based on real-time process fluid temperature measurements to maintain a target temperature at the coolant control location. This dynamic control ensures optimal temperature management while coordinating with the primary pathway's superheat control
Solution Approach 2:
The system implements feedback control mechanisms where temperature sensors monitor the process fluid temperature and superheat conditions, and this information is used to adjust the expansion devices accordingly. The controller modifies the secondary expansion device operation based on temperature feedback to maintain precise control
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 configuration enhances cooling efficiency, reduces the risk of liquid slugging, and optimizes the state of working fluid provided to the compressor, while maintaining efficient cooling of devices, by controlling expansion devices based on real-time temperature and superheat monitoring.
Implementation Method 1
the secondary evaporator is configured for heat exchange between the working fluid and a process fluid of the coolant circuit
Implementation Method 2
control the primary expansion device to maintain a target superheat of the working fluid... control the secondary expansion device based on monitoring a temperature of the process fluid to maintain a target temperature
Data Source
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AI summary
According to a first aspect there is disclosed evaporator apparatus 100 for a refrigeration cycle of an HVAC system or a refrigeration system. The evaporator apparatus 100 comprises: a primary evaporator pathway 110 for a working fluid of the refrigeration cycle extending through a primary expansion device 112 and a primary evaporator 114; a secondary evaporator pathway 120 for the working fluid in parallel with the primary evaporator pathway and extending through a secondary expansion device 122 and a secondary evaporator 124; a coolant circuit 130 for cooling a device 140, wherein the secondary evaporator 124 is configured for heat exchange between the working fluid and a process fluid of the coolant circuit 130; and a controller 190 configured to: control the primary expansion device 112 to maintain a target superheat of the working fluid at a primary control location 192 downstream of the primary evaporator 114; and control the secondary expansion device 122 based on monitoring a temperature of the process fluid to maintain a target temperature of the process fluid at a coolant control location 194 in the coolant circuit 130. According to a second aspect there is disclosed a refrigeration system 200 comprising evaporator apparatus 100 in accordance with the first aspect. According to a third aspect, there is disclosed a method 300 of operating evaporator apparatus 100 in accordance with the first aspect or a refrigeration system 200 in accordance with the second aspect.