Indirect Pool Water Heating With Non-Pressurized Modular Heaters
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Solution Overview
Problem
Conventional swimming pool heaters are inefficient, large, and require significant space, leading to high energy consumption and maintenance issues, including incomplete combustion, soot formation, and compliance with costly municipal codes.
Innovation Solution
A non-pressurized, indirect swimming pool water heating system with a heat exchanger that circulates pool water in a first loop and uses a separate loop with a remote heater to indirectly heat the water, featuring modular, sequentially actuated heating units vented to the atmosphere, minimizing space usage and avoiding direct contact with chlorinated water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional gas fired furnaces or boilers are used to directly heat pool water, then heating function is achieved, but heating efficiency is poor (approximately 60%) and large floor space is required
Solution Approach 1:
The heating system is divided into multiple modular heating units (e.g., 50,000 BTU units) that can be staged sequentially. Each unit operates independently, allowing the system to scale heating capacity while maintaining high efficiency. This segmentation enables smaller, more efficient units to replace a single large conventional boiler.
Solution Approach 2:
A heat exchanger is introduced as an intermediary component that transfers heat from the heating units to the pool water indirectly. This allows the pool water to be heated efficiently without direct contact with combustion gases, improving thermal efficiency while reducing the size of the heating equipment needed.
2Reliability
If conventional combustion furnace heaters are used, then heating is provided, but incomplete combustion occurs due to condensation on cold pipes, creating soot that plugs the heat exchanger and decreases efficiency
Solution Approach 1:
The system pre-heats the water entering the heating units through the heat exchanger before it reaches the combustion chamber. This preliminary heating action prevents condensation from forming on cold pipes, ensuring complete combustion and preventing soot formation that would otherwise plug the heat exchanger.
Solution Approach 2:
The control system monitors combustion conditions and water temperature, adjusting the operation of heating units to maintain optimal combustion temperatures. This feedback control prevents incomplete combustion by ensuring water is always above the dew point, eliminating soot formation and maintaining high efficiency.
3Productivity
If chlorinated pool water is pumped through the heater, then heating is achieved, but the chlorine and chemicals decay the copper pipes internally while acidic soot attacks them externally
Solution Approach 1:
The heat exchanger serves as an intermediary barrier between the chlorinated pool water and the heating unit components. Pool water flows through one side of the heat exchanger while heated water from the heating units flows through the other side, allowing heat transfer without direct contact. This protects copper pipes from both internal chemical corrosion and external soot damage.
4Power
If multiple conventional heaters are used for large pools, then sufficient heating capacity is achieved, but space utilization increases significantly
Solution Approach 1:
The system uses multiple compact modular heating units (e.g., 50,000 BTU each) that can be staged sequentially to provide sufficient heating capacity for large pools. These compact units occupy minimal floor space compared to a single large conventional boiler, while maintaining the required heating output through coordinated operation of multiple smaller units.
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 efficiency, reduced space requirements, extended operating life, and compliance with municipal codes by staging heating units and using a closed, unpressurized system that prevents soot formation and reduces maintenance costs.
Implementation Method 1
A heat exchanger is provided in the pit, or alternatively can be mounted on the floor. The pool water does not flow through the heater, but rather is indirectly heated by the water flowing through the heat exchanger.
Implementation Method 2
The system indirectly heats the pool water in an efficient manner using a heat exchanger
Implementation Method 3
The heating units are vented to the atmosphere so as to be unpressurized
Data Source
AI summary
In an improved swimming pool water heating system, water in the pool circulates through a first loop from the pool to a surge pit and through a filter before returning to the pool. The heating system includes a second loop with a heat exchanger and a remote water heater. The pool water is heated by the heat exchanger. The first and second circulation loops are separate from one another. The heater may include multiple heating units which can be staged for sequential actuation. The second circulation loop is closed, such that the pool water does not flow through the heater, but rather is indirectly heated via the heat exchanger. The heater is isolated from the pool water. The heating units are vented to atmosphere so as to be non-pressurized.