Solar switching system
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Solution Overview
Problem
Existing hot water supply systems in high-rise buildings experience heat loss and inefficient energy use due to heat exchange mechanisms, where water in warmer apartments flows to colder apartments, causing overall cooling and wasting energy, especially when the pump is inactive or on cloudy days.
Innovation Solution
A control system that uses thermistors to measure the temperature of the heating fluid and water in each boiler, activating a motorized valve to disconnect or connect the heat exchange based on temperature differences, preventing heat loss and optimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a common solar system with heat exchangers is used in high-rise buildings, then roof space requirements are reduced, but heat loss occurs through internal heat-exchangers when water temperature exceeds heating fluid temperature
Solution Approach 1:
The system performs preliminary action by activating the pump before heat loss can occur. The controller monitors temperatures and activates the pump when heating fluid temperature is lower than water temperature, preventing negative heat exchange before it happens. This proactive approach stops heat loss through internal heat-exchangers before it can affect system efficiency.
Solution Approach 2:
The system implements feedback control by continuously monitoring temperatures of both the heating fluid and water in boilers, comparing these temperatures, and automatically adjusting pump operation accordingly. When the heating fluid temperature is lower than water temperature, the feedback loop activates the pump to prevent heat loss, and deactivates it when temperatures are appropriate, optimizing energy usage.
2Productivity
If the pump is activated based on maximum point heat exchange principle, then solar heating efficiency is optimized, but heat is wasted on cloudy days when no effective solar heating occurs
Solution Approach 1:
The system uses feedback control to monitor both solar heating effectiveness and temperature differences. On cloudy days, when solar heating is ineffective, the feedback mechanism detects that heating fluid temperature does not increase appropriately and that water temperature exceeds heating fluid temperature, thereby activating the pump to prevent heat waste. This adaptive feedback approach maintains productivity while preventing energy loss under varying weather conditions.
Solution Approach 2:
The system dynamically adjusts pump operation based on real-time conditions rather than following a fixed activation schedule. The pump operates dynamically in response to changing weather conditions, solar heating effectiveness, and temperature differentials. This dynamic approach allows the system to maximize solar heating efficiency on sunny days while preventing heat waste on cloudy days when solar heating is ineffective.
3Use of energy by moving object
If natural convection is allowed in boilers without pump activation, then energy consumption is reduced, but heat loss occurs as hot water flows to colder apartments
Solution Approach 1:
The system uses feedback control to monitor water temperatures in different apartments and heating fluid temperature. When natural convection would cause heat loss (heating fluid temperature lower than water temperature), the feedback mechanism activates the pump to control water flow and prevent hot water from flowing to colder apartments. This selective activation maintains energy efficiency while preventing heat loss.
Solution Approach 2:
The system takes preliminary action by activating the pump before natural convection can cause harmful heat loss. By continuously monitoring temperatures and predicting when heat loss might occur, the system activates the pump in advance to control water flow patterns, preventing hot water from flowing to colder apartments before the heat loss can occur.
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
Significantly conserves energy by ensuring optimal use of solar-generated heat and preventing heat loss, maintaining efficient water temperature in each apartment, even on cloudy days.
Implementation Method 1
A control system that uses thermistors to measure the temperature of the heating fluid and water in each boiler
Implementation Method 2
From the hot heating fluid pipe line 12, one heating fluid input pipe line 13 branches out for each internal heat-exchanger 14. In the course of the flow of the heating fluid (not shown in the illustrations), heat is exchanged, the water 22 in the boiler 21 is heated, while the heating fluid is cooled.
Implementation Method 3
Often, the heat exchange solar system includes a pump 17, which facilitates the flow of the heating fluid.
Implementation Method 4
Cold water enters a solar panel, where it is heated by the heat of the sun
Data Source
AI summary
A method and a control system for a hot water supply system, wherein the hot water supply system includes at least one boiler having a heating fluid input pipe line, the control system comprising: a motorized valve; installed upon the heating fluid input pipe line; a first thermistor installed upon the heating fluid input pipe line; a second thermistor installed within the boiler; a motor mechanically connected to the motorized valve; and a controller, wherein the controller is adapted for opening and closing the motorized valve according to temperature difference between a temperature measurement by the first thermistor and a temperature measurement by the second thermistor, wherein the controller is electrically connected to the motor, to the first thermistor, and to the second thermistor.