Pool Heater Modulation Control for Overshoot and Energy Use

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Solution Overview

Problem

Existing modulating pool or spa heater systems lack the ability to efficiently adjust their modulation based on various pool or spa conditions, leading to suboptimal energy usage and safety concerns.

Innovation Solution

A modulating heater system that includes a controller capable of determining a predicted load and temperature overshoot setpoints, adjusting the modulation rate based on current water and ambient temperatures, and optimizing energy usage by varying the modulation rate between a first and second rate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a modulating heater operates at maximum capacity continuously, then heating speed is improved, but energy efficiency deteriorates

Engineering Contradiction:

Improveheating speedVSAvoidenergy efficiency

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The heater implements dynamic modulation capability, allowing the heating element to vary its output capacity continuously between minimum and maximum levels based on real-time temperature feedback and predicted load requirements, rather than operating at fixed capacity levels

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters by adjusting the modulation rate based on error values calculated from temperature deviations, enabling the heater to adapt its energy output to match actual heating needs and improve overall energy efficiency

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If a modulating heater adjusts modulation rate frequently, then adaptability to pool conditions is improved, but system complexity increases

Engineering Contradiction:

Improveadaptability to pool conditionsVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system employs feedback mechanisms where the controller continuously monitors water temperature, ambient conditions, and heater performance, then adjusts modulation rates based on calculated error values to maintain optimal heating operation

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The controller determines predicted load and temperature overshoot setpoints in advance based on pool size estimates and environmental conditions, allowing the system to proactively adjust heating parameters before temperature deviations occur

Inventive Principle:

Principle #10Preliminary action

3Productivity

If a modulating heater operates at high modulation rate, then heating efficiency is improved, but risk of temperature overshoot increases

Engineering Contradiction:

Improveheating efficiencyVSAvoidtemperature overshoot

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The system applies partial action by operating the heater at optimized modulation rates rather than always at maximum capacity, determining appropriate heating intensity based on calculated error values to achieve sufficient heating without excessive temperature increases

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The controller calculates predicted load and temperature overshoot setpoints in advance to anticipate and counteract potential temperature overshoot conditions before they occur, adjusting modulation rates proactively

Inventive Principle:

Principle #9Preliminary anti-action

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 enhanced adaptability to various pool or spa conditions, optimized energy usage, and improved safety by automatically adjusting the modulation rate based on real-time data and predefined setpoints.

Implementation Method 1

The heater is capable of variably modulating energy output thereof to heat the water of the pool or spa

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

heating the water being circulated in the pool or spa

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS12222702B2Modulating pool or spa heater systems and associated methods

Publication Date: 2025.02.11 HAYWARD IND INC

AI summary

A modulating heater system for a pool or spa includes a pool or spa heater capable of variably modulating energy output thereof and a controller communicatively coupled thereto. The controller determines a predicted load based on a previous load, ambient and water temperatures, and estimated pool/spa size, and determines an overshoot setpoint for an operational mode. The controller establishes a target temperature setpoint for the mode and receives a current water temperature. The controller determines whether the overshoot setpoint plus target temperature setpoint is greater than the current water temperature, and determines an error based thereon. The controller determines if the error is less than or greater than a target for the mode, and, based on this determination, determines a heater modulation rate for the mode taking into account the mode, maximum heater output, and available fuel supply. The controller controls the heater to operate at the determined modulation rate.