Coffee Sprayhead Siphon Design for Continuous Water Flow
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Solution Overview
Problem
Pour over coffee brewing machines using flash boilers deliver hot water intermittently due to the expansion of steam, leading to uneven water flow and compromised organoleptic characteristics of brewed coffee.
Innovation Solution
A sprayhead with a housing, a holding chamber vented to the atmosphere, and a dispensing chamber connected via a siphon arrangement that ensures a continuous flow of hot water from the holding chamber to the dispensing chamber, allowing for steady water delivery with minimal mechanical or electrical control, and optional features like a bell siphon or curved siphon tube for efficient water transfer and drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a flash boiler is used to heat water rapidly, then heating speed is improved, but water flow becomes intermittent and uneven
Solution Approach 1:
The spray head accumulates hot water in a chamber before dispensing, preparing the water in advance to ensure continuous and uniform flow during the brewing process, regardless of intermittent heating cycles
Solution Approach 2:
The spray head acts as an intermediary device between the flash boiler and the coffee grounds, buffering the intermittent hot water supply into a continuous flow through its accumulation and controlled dispensing mechanism
2Loss of energy
If water is delivered intermittently from the flash boiler, then energy efficiency is improved, but brewing quality deteriorates
Solution Approach 1:
The spray head accumulates the required volume of hot water in advance within its chamber, ensuring that sufficient hot water is available for complete brewing cycles even when heating occurs in intermittent pulses
Solution Approach 2:
The spray head maintains continuous water flow to the coffee grounds during brewing by dispensing from the accumulated water supply, ensuring uninterrupted contact between water and coffee for reliable extraction
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 sprayhead provides a steady and continuous flow of hot water to the coffee grounds, optimizing the brewing process by maintaining consistent water temperature and flow rate, enhancing the quality of brewed coffee through improved wetting, extraction, and hydrolysis stages.
Implementation Method 1
the delivery means is a siphon arrangement connecting the holding chamber with the dispensing chamber, which siphon arrangement releases the accumulated quantity of water each time the holding chamber has filled with water
Implementation Method 2
a flash boiler, also known as a bubble pump, is commonly used. As the water is heated in the flash boiler a two phase mixture of gas phase and liquid phase water is created
Implementation Method 3
As the water heats it expands, as steam is generated. This forces the water out of the flash boiler and on to the sprayhead
Implementation Method 4
As the water is heated in the flash boiler a two phase mixture of gas phase and liquid phase water is created. As this two phase mixture is less dense than the equivalent volume of cold water, the heated water is pushed out of the boiler and on to the sprayhead
Data Source
AI summary
A sprayhead for a pour over coffee brewing machine for delivering hot water to coffee grounds held in a brew basket therebelow, has a housing with a water inlet at one end thereof, which is connectable to an intermittent source of hot water. A holding chamber for accumulating a quantity of hot water therein is located within the housing and is connected to the water inlet. A dispensing chamber is located within the housing and below the holding chamber, in use. A bell siphon located in the holding chamber delivers the accumulated quantity of water from the holding chamber to the dispensing chamber, and then to the coffee grounds, once the water level in the holding chamber rises above an open end of a siphon tube.