Bypass Economizer Heat Exchanger for Low-Ambient Heating
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Solution Overview
Problem
Climate control systems with single reversible refrigerant circuits struggle to maintain heating capacity at low ambient temperatures, and more complex designs with multiple circuits and heat exchangers are often impractical due to size, cost, and performance issues.
Innovation Solution
A climate control system incorporating a refrigerant circuit with a main circuit and a bypass circuit, featuring an economizer heat exchanger coupled to an accumulator, which directs a portion of the refrigerant fluid from between heat exchangers to an economizer heat exchanger to exchange thermal energy, using a bypass control valve and metering device to control pressure and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reversible refrigerant circuit is used, then system simplicity is maintained, but heating capacity at low ambient temperatures deteriorates
Solution Approach 1:
The refrigerant circuit is segmented into a main circuit and a bypass circuit. The bypass circuit includes an economizer heat exchanger that operates independently from the main circuit, allowing thermal energy recovery without disrupting the primary refrigeration cycle. This segmentation enables the system to maintain heating capacity at low temperatures while preserving overall system simplicity.
Solution Approach 2:
The economizer heat exchanger is integrated within or coupled to the accumulator component, creating a nested configuration where the heat exchanger utilizes the accumulator's thermal mass and space. This nesting approach adds thermal energy recovery functionality without proportionally increasing system size or complexity, thereby maintaining heating capacity while preserving system simplicity.
2Reliability
If multiple circuits and heat exchangers are used, then heating capacity at low ambient temperatures is improved, but system complexity and size increase
Solution Approach 1:
The economizer heat exchanger serves multiple functions: it recovers thermal energy from the refrigerant line, pre-cools or pre-heats refrigerant, and utilizes the accumulator's thermal mass. This multi-functionality allows the system to achieve improved heating capacity at low temperatures without adding proportionally to system complexity, as a single component performs multiple thermal management tasks.
Solution Approach 2:
The economizer heat exchanger is merged with the accumulator component, combining two functional elements into a integrated assembly. This merging reduces the total number of discrete components and connections required, thereby improving heating capacity while minimizing the increase in system complexity and size.
3Loss of energy
If an economizer heat exchanger is added to the refrigerant circuit, then thermal efficiency is improved, but system complexity increases
Solution Approach 1:
The economizer heat exchanger utilizes the thermal energy already present in the refrigerant line and accumulator without requiring external energy input or complex control systems. The heat exchange process is self-regulating based on temperature differentials, improving thermal efficiency while minimizing the increase in system complexity through passive operation.
Solution Approach 2:
By nesting the economizer heat exchanger within the accumulator assembly, the patent minimizes the additional space and component count required. This integrated configuration allows thermal efficiency improvement through heat recovery while keeping the increase in system complexity minimal, as the heat exchanger shares structural and spatial resources with the existing accumulator.
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 design enhances thermal efficiency and maintains heating performance at low ambient temperatures while minimizing system complexity, providing effective packaging and thermal energy exchange.
Implementation Method 1
the third heat exchanger located at the accumulator and configured to exchange thermal energy between the portion of the refrigerant fluid and the refrigerant fluid in the main circuit
Implementation Method 2
the bypass metering device configured to lower the pressure of the portion of the refrigerant fluid before the portion of the refrigerant fluid enters the third heat exchanger
Data Source
AI summary
Example embodiments of the present disclosure relate to a climate control system and methods for controlling the system. Some embodiments include a system that includes a refrigerant circuit with both a main circuit and a bypass circuit, where the main circuit directs the refrigerant fluid from a compressor to a first heat exchanger, a metering device, a second heat exchanger, and an accumulator, and the bypass circuit selectively directs a portion of the refrigerant fluid to a third heat exchanger. The bypass circuit includes a bypass control valve and a bypass metering device, the bypass control valve controlling the flow of the portion of the refrigerant fluid to be directed to the third heat exchanger, and the bypass metering device lowering the temperature of the portion of the refrigerant fluid before the portion of the refrigerant fluid enters the third heat exchanger. The third heat exchanger may be located proximate the accumulator.