Freeze prevention valve
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Solution Overview
Problem
Solar collector panels are prone to freezing in cold temperatures, leading to damage, as existing solutions do not effectively prevent water from freezing within the panels.
Innovation Solution
A freeze prevention valve with a temperature sensing device and return spring mechanism that automatically opens to allow warmer water from a hot water storage tank to replace freezing water, and closes when temperatures rise, preventing fluid flow and maintaining the panel's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a freeze prevention valve is installed on a solar collector panel, then the panel is protected from freezing damage, but the valve mechanism adds complexity to the system
Solution Approach 1:
The valve employs a temperature-sensitive element that automatically responds to temperature changes without requiring external control systems. When the temperature drops below freezing, the element contracts and triggers the valve to open, allowing water to drain and preventing freeze damage. This self-activating mechanism eliminates the need for complex electronic controls or manual intervention.
Solution Approach 2:
The temperature-sensitive element acts as an intermediary between the temperature condition and the valve action. This element translates thermal conditions into mechanical movement, which then actuates the valve. This intermediary mechanism provides a reliable and simple way to convert temperature sensing into valve control without requiring complex transducers or electronic components.
2Loss of substance
If the valve remains closed to prevent water loss, then water is retained in the panel, but freezing water expands and damages the panel
Solution Approach 1:
The valve takes preliminary action by opening before freezing damage can occur. The temperature-sensitive element is calibrated to respond at temperatures just above freezing, triggering valve opening in advance of the harmful freezing expansion. This preliminary response allows water to drain before it can freeze and expand, preventing damage to the panel.
Solution Approach 2:
The system converts the harmful effect of cold temperatures into a beneficial automatic response. The temperature drop that would normally cause freezing damage instead triggers the temperature-sensitive element to contract, which automatically opens the valve to drain water. The harmful cold temperature thus becomes the activating signal for protection.
3Reliability
If the valve opens automatically in response to temperature changes, then freeze protection is provided, but the frequent opening and closing causes wear on valve components
Solution Approach 1:
The temperature-sensitive element provides continuous feedback on temperature conditions to the valve mechanism. This feedback loop ensures the valve opens only when necessary (when temperature drops below the activation threshold) and closes when conditions improve. This responsive feedback mechanism prevents unnecessary cycling and extends component life by activating only when freeze protection is actually needed.
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
Effectively prevents water from freezing in solar collector panels by automatically diverting and replacing freezing water, thereby protecting the panels from damage and ensuring continuous operation.
Implementation Method 1
the temperature sensing device comprising a temperature sensitive element, wherein the temperature sensitive element contracts when the temperature of a fluid sensed by the temperature sensing device decreases and expands when the temperature of the fluid sensed by the temperature sensing device increases
Data Source
AI summary
A freeze prevention valve comprising a body having an inlet (14) and an outlet (16) for fluid to exit the valve in an open condition, a valve seat (18) provided adjacent an opening (22) of the valve, a piston member (20) that is movable in the body, the piston member comprising a piston shaft and a piston head (24), the piston head (24) arranged to seat against the valve seat (18) in a closed condition of the valve, a temperature sensing device (26) comprising a temperature sensitive element (28), operatively associated with the piston head (24), wherein the temperature sensitive element contracts and expands when the temperature of the fluid sensed by the temperature sensing device decreases or increases, wherein contraction of the temperature sensitive element allows the return spring (30) to move the piston member to unseat the piston head from the valve seat and thereby open the valve.