Rotary Expander Compressor Direct Drive Gas Cycle
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Solution Overview
Problem
Conventional air conditioning systems are energy inefficient due to inefficiencies in refrigeration cycles, leading to high energy consumption and environmental impact, and the Bell-Coleman cycle is cumbersome, expensive, and prone to inefficiencies and mechanical issues.
Innovation Solution
A gas-cycle system using a Bell-Coleman cycle with a direct drive mechanism between an expander and compressor, featuring rotor assemblies with continuously changing volume zones and ports that minimize frictional losses, allowing for efficient heating and cooling without the need for large machinery or external energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional refrigeration cycles are used for heating and cooling, then heating and cooling functions are achieved, but energy consumption is high and coefficient of performance is limited
Solution Approach 1:
The patent changes the thermodynamic parameters of the cycle by using a Bell-Coleman cycle with air as refrigerant instead of conventional refrigeration cycles. The system achieves higher COP by utilizing adiabatic compression and expansion processes, where the air is compressed adiabatically to raise temperature and expanded adiabatically to lower temperature, fundamentally changing the operational parameters compared to conventional cycles
Solution Approach 2:
The patent replaces the conventional mechanical refrigeration system with a gas-cycle system using air as refrigerant. The direct coupling of expander to compressor replaces traditional separate drive mechanisms, reducing mechanical losses and improving overall system efficiency while achieving both heating and cooling functions
2Reliability
If Bell-Coleman cycle uses large machinery for refrigeration, then cooling effect is achieved, but device size is large and friction losses are high
Solution Approach 1:
The patent merges the expander and compressor into a single integrated unit with direct coupling, where the expander is directly coupled to drive the compressor. This consolidation reduces the overall machinery size, eliminates intermediate transmission components, and reduces friction losses while maintaining effective cooling
Solution Approach 2:
The patent uses pneumatic principles by utilizing air as the refrigerant medium throughout the cycle. The air is compressed adiabatically and expanded adiabatically to achieve temperature changes, replacing liquid refrigerant systems and reducing the need for large mechanical components
3Power
If reciprocating components are used in Bell-Coleman cycle, then compression and expansion are achieved, but vibration is high
Solution Approach 1:
The patent employs rotary compressors and expanders with curved, spiral, or lobed chamber designs instead of reciprocating piston mechanisms. The rotary motion with continuously varying chamber volumes achieves compression and expansion while eliminating the reciprocating motion that causes vibration, resulting in smoother operation
Solution Approach 2:
The patent substitutes reciprocating mechanical systems with rotary systems. The direct coupling of rotary expander to rotary compressor eliminates connecting rods, pistons, and valves associated with reciprocating motion, thereby eliminating the source of vibration while maintaining compression and expansion functions
4Reliability
If air is cooled to below freezing in Bell-Coleman cycle, then refrigeration effect is enhanced, but snow accumulates around valves restricting air flow
Solution Approach 1:
The patent extracts or removes the valves from the system by using a valveless rotary compressor and expander design. The rotary mechanisms use fixed geometry chambers that expand and contract during rotation, eliminating the need for moving valves that would be subject to snow accumulation and flow restriction
Solution Approach 2:
The patent uses smooth, curved rotary chamber designs that prevent air stagnation and snow accumulation. The continuous rotary motion and smooth transitions in chamber geometry prevent the conditions that lead to snow buildup around valve mechanisms
5Ease of operation
If conventional air conditioning systems replace heated or cooled air with outside air, then ventilation is achieved, but energy consumption increases
Solution Approach 1:
The patent recovers energy from the refrigerant air by utilizing the cold air from the evaporator to cool incoming outside air and the hot air from the compressor to preheat incoming air for heating mode. This heat recovery process reduces the energy required to condition ventilation air compared to discarding the conditioned air
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
The system achieves improved energy efficiency, reduced size and weight, lower vibration, and unrestricted air flow, enabling cost-effective air conditioning with enhanced coefficient of performance and reduced energy consumption.
Implementation Method 1
Air is drawn from a space to be heated and expanded adiabatically within the expander, thereby reducing the pressure and temperature
Implementation Method 2
The air is then passed through a heat exchanger and warmed, typically to a temperature at or approaching that of a heat source
Implementation Method 3
The air is then compressed adiabatically to ambient pressure, which increases the temperature
Implementation Method 4
the expander and compressor each comprising a rotor assembly configured to define a zone which changes continuously in volume during a rotation cycle of the rotor assembly
Implementation Method 5
the expander and compressor being drivingly interconnected whereby rotational drive applied to one is transmitted directly to the other
Data Source
AI summary
A gas-cycle system operable using a Bell-Coleman cycle, the gas-cycle system comprising an expander (23) and a compressor (27) incorporated in a flow path (13). The expander (23) and compressor (27) are integrated in a rotary machine (41), and each comprises a rotor assembly (70) configured to define one or more zones (80) each of which changes continuously in volume during a rotation cycle of the rotor assembly. The expander (23) and compressor (27) are drivingly interconnected whereby rotational drive applied to one is transmitted directly to the other. Each rotor assembly (70) comprises an inner rotor (73) and an outer rotor (75) adapted to rotate about parallel axes at different rotational speeds. The inner rotors (73) are each drivingly connected to a common shaft for rotation therewith. The two outer rotors (75) are coupled together such that rotational drive applied to one is transmitted directly to the other. An air-cycle system and an air conditioning system (10) based on the gas-cycle system are also disclosed.