Hydrotherapy System Rapid Temperature Control
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Solution Overview
Problem
Conventional hydrotherapy systems take an excessively long time to change water temperatures from bath water temperatures to those suitable for cold water therapy, causing discomfort and inefficiency.
Innovation Solution
A hydrotherapy system comprising a tub, a cold water tank, fill jets, a return line, a transfer pump, and a mixing valve, controlled by a controller to rapidly adjust water temperature by blending returned water with chilled water from the tank, allowing for temperature changes within 1-5 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional hydrotherapy systems are used to change water temperature from bath water temperature to cold water therapy temperature, then the temperature adjustment is achieved, but the time required is excessively long (hours)
Solution Approach 1:
The system pre-chills water in a separate tank before it is needed for therapy. The cold water tank is filled with water that has been chilled in advance, so when temperature adjustment is needed, the system only needs to transfer and mix the pre-chilled water rather than cooling the entire tub volume from scratch, dramatically reducing the time required.
Solution Approach 2:
The system divides the water management into separate components: a cold water tank for storing pre-chilled water, a hot water tank for storing pre-heated water, and a mixing system that combines these with recirculated tub water. This segmentation allows independent temperature control and rapid mixing without requiring the entire tub to be heated or cooled uniformly.
2Temperature
If a refrigerant system is used to cool water to appropriate temperature, then the temperature is achieved, but the cost, storage, transportation, and weight issues arise
Solution Approach 1:
The system extracts the cooling function from a complex refrigerant system and replaces it with a simpler pre-chilling approach. Instead of using a refrigerant system to cool the entire tub volume, the system uses a separate cold water tank that is filled with pre-chilled water, eliminating the need for complex refrigerant circulation and control systems.
Solution Approach 2:
The system uses readily available water as the cooling medium rather than expensive refrigerants. The cold water tank is simply filled with water that has been chilled in advance, using inexpensive cooling methods rather than complex refrigeration systems, thereby reducing cost and complexity.
3Temperature
If ice is used to cool water to appropriate temperature, then the temperature is achieved, but the inconvenience due to cost, storage, transportation, and weight issues occurs
Solution Approach 1:
The system performs the cooling action in advance by pre-chilling water in a separate tank. This eliminates the need to handle and add ice during use, as the cold water is already prepared and can be transferred directly into the tub through the mixing system, greatly improving convenience.
Solution Approach 2:
The system introduces a cold water tank as an intermediary component that stores pre-chilled water. This intermediary allows the cooling function to be separated from the tub itself, enabling rapid temperature adjustment without the need to manually add cooling agents like ice to the tub water.
4Productivity
If the water temperature is lowered rapidly to achieve cold water therapy, then the therapy efficiency is improved, but the discomfort to the user increases
Solution Approach 1:
The system applies cold water locally through targeted injection points at the bottom of the tub rather than uniformly cooling the entire water volume. The cold water is delivered through nozzles that spray it directly where needed, allowing rapid cooling in the therapeutic zone while the rest of the water remains relatively warmer, thus reducing overall discomfort.
Solution Approach 2:
The system dynamically adjusts the mixing ratio of cold water, hot water, and recirculated water based on real-time temperature feedback. The controller monitors the water temperature and automatically adjusts the flow rates of the pumps and valves to achieve the desired cooling rate, preventing excessive cold shocks while maintaining therapy effectiveness.
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
Enables rapid temperature adjustments from 80° F to 50°-59° F in 3-5 minutes, minimizing discomfort and improving the efficiency of cold water therapy sessions.
Implementation Method 1
at least one mixing valve located upstream of the transfer pump and configured to control a first flow rate through the return line and a second flow rate through the cold water intake such that the first flow rate and the second flow rate constitute a total flow rate reaching the inlet of the transfer pump
Implementation Method 2
a transfer pump having an inlet configured to be in variable fluid communication with the return line and the cold water intake and an outlet configured to be in fluid communication with the one or more fill jets
Implementation Method 3
a cold water tank, a cold water intake in fluid communication with the cold water tank
Data Source
AI summary
A hydrotherapy system can include a tub of tempered water, a cold water tank, and a refrigeration system. The system cools the water in the tub following initial immersion of the patient by using valving in conjunction with a transfer pump allowing blending of the cold water from the cold water tank with the tempered water of the tub to gradually begin the therapy process.