Boiler Target Temperature Control for Variable Heating Demand
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Solution Overview
Problem
Existing hot water heating systems face inefficiencies due to fixed boiler target temperatures, which do not adapt well to varying ambient conditions, leading to increased energy consumption and reduced performance in diverse weather environments.
Innovation Solution
A method that dynamically adjusts the boiler target temperature by reducing it in response to heat demands and increasing it when demands are not met, using a combination of temperature measurement devices and a controller to implement thermal reduction and boost algorithms, thereby optimizing energy usage based on changing heating needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a fixed high boiler target temperature is used, then heat delivery speed is improved, but energy efficiency deteriorates during warmer ambient conditions
Solution Approach 1:
The boiler target temperature is made dynamic rather than fixed. The controller continuously adjusts the target temperature based on ambient conditions and heating demand, lowering it during warmer periods and raising it during colder periods, thereby resolving the contradiction between fast heat delivery and energy efficiency
Solution Approach 2:
The system changes the operating parameter (boiler target temperature) based on external conditions. By monitoring ambient temperature and heating demand, the controller adjusts the target temperature parameter to optimize both heat delivery performance and energy efficiency under varying conditions
2Reliability
If a fixed high boiler target temperature is used, then heating demand satisfaction is improved, but burner operation duration increases during warmer ambient conditions
Solution Approach 1:
The target temperature parameter is adjusted based on ambient conditions and heating demand patterns. During warmer conditions with lower heating demand, the reduced target temperature allows the burner to operate for shorter durations while still satisfying heating requirements, thereby reducing unnecessary burner operation time
3Adaptability or versatility
If outdoor reset control is installed with temperature sensor, then adaptability to ambient conditions is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The controller performs multiple functions: it monitors ambient temperature, detects heating demand from the building, adjusts the boiler target temperature accordingly, and manages burner operation. This multi-functionality eliminates the need for separate outdoor reset control hardware while achieving the same adaptability benefit
Solution Approach 2:
The system uses the building's existing heating demand signals (from thermostats and control systems) as input to automatically adjust the boiler target temperature. This self-service approach eliminates the need for external temperature sensors and complex installation while maintaining adaptability to ambient conditions
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
This approach enhances energy efficiency by lowering boiler target temperatures during reduced heat demands and increasing them during unsatisfied heat needs, resulting in significant energy savings and improved system performance across varying environmental conditions.
Implementation Method 1
The fluid can be heated by any energy source, such as gas, or fuel oil
Implementation Method 2
heating an energy transfer medium to a preset temperature and circulating that fluid throughout a building or structure
Implementation Method 3
circulated throughout the structure within ingress and egress flow lines, such as conduits, usually by means of a motorized pump or circulator
Implementation Method 4
heating an energy transfer medium to a preset temperature and circulating that fluid throughout a building or structure typically through heat exchangers, such as radiators, baseboard heaters
Data Source
AI summary
Thermal targeting technology is used to continuously adjust boiler target temperature to the minimum necessary to satisfy the required heating load. Responsive to and initiated by a first call for heat, boiler target temperature is reduced by a predetermined amount upon or subsequent to the call for heat. Once the boiler temperature reaches this new target, a call timer is activated. If demand for heat is satisfied before a time set point is reached, the system ceases providing additional heat energy until the next heat demand. Responsive to and initiated by a next call for heat, the boiler target temperature is again reduced by the predetermined amount upon or subsequent to this next call for heat. Each time the heat demand is satisfied within the predetermined time interval, the boiler target temperature is reduced. If heat demand is not satisfied, a thermal boost is provided at set time intervals until the call for heat is removed.