On-Demand Spa Fill and Drain Control via Tankless Heating
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Solution Overview
Problem
Current spa and hot tub systems require frequent chemical sanitization and significant energy costs for heating and maintaining water temperature, especially when not in use.
Innovation Solution
A spa system incorporating a tankless water heater connected to a programmable controller that allows for on-demand filling and draining of the spa, eliminating the need for chemical sanitization and reducing energy costs by heating water only when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spa is filled with water and maintained using chemicals and heating equipment, then the water can be sanitized and kept at desired temperature, but chemical usage and energy consumption increase
Solution Approach 1:
The system implements periodic action by draining and refilling the spa water on-demand rather than continuously maintaining it. The controller receives signals to drain water from the tub and refill it with fresh water from the water supply, eliminating the need for continuous chemical sanitization and heating maintenance.
2Temperature
If a spa is filled with cold water and heated to designated temperatures, then the water becomes comfortable for use, but electricity costs increase for heating and keeping water heated
Solution Approach 1:
The system uses periodic action by heating water only when needed rather than continuously maintaining temperature. The tankless water heater activates on-demand to heat fresh water during refilling operations, and the circulation heater operates only when the spa is in use, eliminating continuous energy consumption for temperature maintenance.
Solution Approach 2:
The system implements self-service through automatic temperature maintenance during active use. The circulation heater and pump automatically maintain water temperature when the spa is in use, and the system automatically drains and refills water on-demand without requiring continuous manual intervention or energy consumption.
3Ease of operation
If a spa is continuously filled and heated, then water is always ready for use, but water and energy are wasted when not in use
Solution Approach 1:
The system implements periodic action by filling the spa on-demand rather than continuously. The controller activates the tub fill valve to refill water only when receiving a signal that the spa needs water, and activates the drain valve to empty water when needed, eliminating continuous water consumption and waste.
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 provides fresh, non-chlorinated heated water on demand, reducing chemical usage and energy consumption, while allowing for remote control of filling and draining via a smartphone app.
Implementation Method 1
A tankless water heater is connected to a water supply line providing water to the tankless water heater and a hot water line for providing heated water from the tankless water heater to a tub
Data Source
AI summary
A spa system is provided. A tankless water heater is connected to a water supply line providing water to the tankless water heater and a hot water line for providing heated water from the tankless water heater to a tub. A drain line is connected to the tub for draining water from the tub. A programmable controller operable in a plurality of modes comprising a fill mode in which a tub fill valve in the hot water line is activated to release water to the tub and a drain mode in which a tub drain valve in the drain line is activated to release water from the tub.