Thermostatic Radiator Valve Actuator with Remote Set Point Control
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Solution Overview
Problem
Conventional thermostatic actuators in radiant heating systems are passively responsive to environmental temperature changes, making them unsuitable for centralized system control, and electronic actuators require continuous power supply, leading to wiring or onboard battery challenges.
Innovation Solution
A thermostatic actuator with a passive thermostat mechanism and a remotely controllable set point adjustment mechanism, using a thermally responsive element and a driver to adjust the set point temperature based on control signals, allowing for centralized control without continuous power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive thermostatic actuators are used, then energy consumption is reduced, but centralized system control capability is lost
Solution Approach 1:
The actuator is segmented into two functional components: a passive thermostatic mechanism for automatic temperature regulation and a separate electronic control interface for centralized system management. This segmentation allows each component to operate independently with its own energy requirements, enabling the passive mechanism to conserve energy while the electronic portion provides control capability when needed.
Solution Approach 2:
The patent merges the passive thermostatic actuation mechanism with an electronic control system into a single integrated actuator unit. The electronic components include a microprocessor, memory for storing setpoint values, and communication interfaces, which are combined with the traditional bimetallic or wax-based thermostatic elements, creating a hybrid device that exhibits both passive energy efficiency and active control capability.
2Adaptability or versatility
If electronic actuators with motorized drivers are used, then centralized control capability is achieved, but power supply requirements increase
Solution Approach 1:
The electronic control system operates periodically rather than continuously. The microprocessor wakes up at intervals to receive control signals from the central system, adjust the setpoint temperature if needed, and then enters a low-power sleep mode. This periodic operation dramatically reduces average power consumption compared to continuously active electronic actuators, while still maintaining full centralized control capability when required.
Solution Approach 2:
The patent replaces the traditional continuous-power motorized driver with a low-power electronic control system that uses minimal energy for communication and setpoint adjustment. The primary actuation force comes from the passive thermostatic mechanism rather than an electric motor, substituting mechanical/thermal actuation for electrical actuation in the main control function, thereby reducing power supply requirements.
3Ease of operation
If onboard power supplies are included, then actuator autonomy is improved, but maintenance requirements increase
Solution Approach 1:
The actuator is designed to harvest energy from the existing HVAC system environment rather than requiring independent onboard power supplies. It uses the system's control wiring to receive power and communication signals, and the passive thermostatic mechanism requires no external power source. This self-service approach eliminates batteries and rechargeable power packs, thereby eliminating the maintenance burden of replacing or recharging onboard power supplies while maintaining full operational autonomy.
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 efficient temperature control in zoned heating systems by using passive thermal response for normal operation and remote power-driven adjustments, reducing power consumption and battery replacement needs.
Implementation Method 1
A thermally responsive element, such as a bellows, a plug of wax, a metallic coil, etc., expands and contracts and drives movement of a pin to open and close the valve
Data Source
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AI summary
A thermostatic actuator for a radiator valve includes a thermostat mechanism configured to passively open the valve when an environmental temperature is less than a set point and to close the valve when the temperature is greater than the set point. A set point adjustment mechanism draws power from a power supply to selectively drive unitary movement of the thermostat mechanism to adjust the set point. Multiple actuators are used in a zoned radiant heating system in which a controller is operatively connected to the set point adjustment mechanism of each actuator to selectively transmit a control signal to actuate the set point adjustment mechanism to drive unitary movement of the respective thermostat mechanism to adjust the respective set point.