District Heating Circulation Pump Control for Energy Loss Reduction
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Solution Overview
Problem
Existing district and central heating systems face issues with energy loss and inefficient heating water supply due to constant flow rates and lack of precise flow control, leading to oversupply or undersupply of heating water, which results in inefficient heating and increased costs.
Innovation Solution
A heating and hot-water supply device with a circulation connection tube and controller that measures return water temperature, operates a circulation pump, and adjusts heating side flow control valves to maintain optimal flow rates, minimizing energy loss and indirectly measuring heating loads without separate flow rate measuring devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-pipe system is used for heating and hot-water supply, then installation and maintenance costs are reduced, but precise control of heating water flow rate becomes difficult leading to oversupply or undersupply
Solution Approach 1:
The patent implements a feedback control system using a return water temperature sensor to detect the temperature of heating water returning from the heating site. The controller adjusts the opening degree of the flow control valve based on this temperature feedback, creating a closed-loop control system that automatically maintains optimal heating water flow rate without requiring complex manual control or additional pipes.
2Ease of operation
If heating water is supplied at constant flow rate, then system operation is simple, but energy loss increases due to oversupply when heating load is low
Solution Approach 1:
The patent transforms the static constant flow rate system into a dynamic adjustable flow rate system. The flow control valve's opening degree is continuously adjusted based on real-time return water temperature measurements, allowing the system to adapt heating water flow rate to actual heating demands and eliminate energy waste from oversupply.
Solution Approach 2:
The patent changes the flow rate parameter of heating water dynamically based on heating load conditions. By adjusting the opening degree of the flow control valve according to return water temperature, the system varies the heating water flow rate parameter to match actual heating requirements, preventing energy loss from constant oversupply.
3Reliability
If heating water flow rate is increased to ensure sufficient heating, then heating reliability is improved, but floor temperature overshooting occurs causing discomfort
Solution Approach 1:
The return water temperature sensor provides continuous feedback on the thermal state of the heating system. The controller uses this feedback to adjust the flow control valve, preventing both insufficient heating and excessive floor temperature by maintaining optimal flow rates that match actual heating demands.
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
Precise control of heating water flow rates reduces energy loss, prevents oversupply, and ensures comfortable heating by matching water supply to environmental needs, thereby reducing costs and enhancing heating efficiency.
Implementation Method 1
a circulation pump installed at a fluid circulation conduit and configured to connect the inlet tube for a site requiring heating, the site requiring heating, the outlet tube for a site requiring heating, and the circulation connection tube
Implementation Method 2
a heat source configured to supply heating water
Implementation Method 3
a site requiring heating configured to be supplied with heating using the heating water supplied from the heat source 12
Data Source
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AI summary
The objective of the present invention is to provide a heating and hot-water supply device applied to district and central heating and a control method therefor that can minimize energy loss by decreasing the temperature of circulating heating water to be supplied to a heat source. To this end, the heating and hot-water supply device of the present invention comprises: an inlet tube for a site requiring heating, the inlet tube being used to supply the site requiring heating with heating water supplied from a heat source; an outlet tube for the site requiring heating, the outlet tube being used to deliver the heat-exchanged heating water in the site requiring heating to the heat source; a circulation connection tube that connects the inlet tube for the site requiring heating and the outlet tube for the site requiring heating with each other; a circulation pump provided on a fluid circulation conduit that connects the inlet tube for the site requiring heating, the site requiring heating, the outlet tube for the site requiring heating, and the circulation connection tube; and a control unit that makes the fluid circulation conduit a closed loop and then operates the circulation pump while heating.