External Coolant Manifold for Radial Engine Heat Rejection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ground-based power generation systems using radial engines face limitations in heat rejection at high ambient temperatures and noise issues due to air cooling, which restrict their performance and applicability in urban areas.
Innovation Solution
A water-cooled radial engine design with an external coolant manifold system, where each cylinder has a fluid inlet and outlet port connected to respective manifolds, and an external water pump driven by the crankshaft, allowing for efficient heat rejection and reduced noise through the use of a compact and lightweight fluid cooling system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If air cooling is used in radial engines for ground-based power generation, then the system avoids the weight of fluid cooling hardware, but heat rejection capability deteriorates at high ambient temperatures
Solution Approach 1:
The patent transitions from air cooling to liquid cooling by introducing a water jacket system surrounding each cylinder bore and an external coolant manifold. The water jacket defines a coolant path that allows continuous circulation of coolant through the cylinders, providing superior heat rejection capability compared to air cooling, especially at high ambient temperatures.
2Temperature
If a large fan is used to move cooling air in air-cooled systems, then cooling performance is improved, but ambient noise increases
Solution Approach 1:
The patent replaces the noisy large fan required for air cooling with a liquid cooling system that uses a water pump to circulate coolant. The external coolant manifold system delivers coolant to each cylinder through fluid conduits, providing effective cooling without the high noise levels associated with large diameter fans moving substantial volumes of air.
3Temperature
If water cooling is employed in radial engines, then heat rejection is improved, but the complexity of the cooling system increases
Solution Approach 1:
The patent divides the cooling system into modular components: an external coolant manifold, multiple fluid conduits connecting to each cylinder, and water jackets surrounding individual cylinder bores. This segmented approach allows the complex water cooling system to be managed through standardized, repeatable units for each cylinder, reducing overall system complexity despite the added functionality.
4Weight of moving object
If aluminum cylinder heads are used to reduce weight, then power-to-weight ratio is improved, but thermal stability deteriorates due to lower melting point
Solution Approach 1:
The patent implements a water jacket cooling system that circulates coolant directly through channels in the cylinder head and around the cylinder bore. This active liquid cooling provides superior heat removal capability compared to air cooling, enabling the use of lighter aluminum cylinder heads while maintaining thermal stability and preventing melting or excessive heat damage.
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 water-cooled radial engine achieves high power density and reliability, enabling peak horsepower output at 2300 RPM while minimizing weight and noise, making it suitable for portable electric power generation with reduced environmental impact.
Implementation Method 1
fluid cooling (typically water combined with a chemical coolant additive)
Implementation Method 2
the head material could melt without adequate cooling
Data Source
AI summary
Methods and systems for cooling a radial engine in a ground-based portable electric power generating system. The engine includes a plurality of cylinders extending radially from a central hub supporting a crankshaft. Each cylinder has a coolant inlet port and a coolant outlet port. The cooling system includes an inlet coolant manifold interconnecting at least two of the coolant inlet ports. The inlet coolant manifold is disposed external to the central hub.