Energy-Saving Analysis about Control Strategy of District Heating System

2014 ◽  
Vol 672-674 ◽  
pp. 554-557
Author(s):  
Cai Xia Hao ◽  
Hai Ping Zhang ◽  
Chun Ping Lu
Keyword(s):  
Energy Saving ◽  
Control Strategy ◽  
District Heating ◽  
Heating System ◽  
Operating Mode ◽  
Variable Frequency ◽  
Operating Parameters ◽  
Cogeneration Plant ◽  
District Heating System ◽  
Operating Modes

Three operating modes of district heating system are introduced and the operating parameters are compared. To find out the most energy-saving one, an experiment is carried out in a cogeneration plant. An operating mode using variable frequency circulating pump for flow control at a constant supply and return water temperature difference is proposed. The conclusion shows that using variable frequency circulating pump is a more energy-saving method.

Heat Recovery Enhancement and Operational Issues of a 200 kWe Fuel Cell Cogeneration Plant

1999 ◽  
Author(s):  
Erika Söderlund ◽  
Andrew R. Martin ◽  
Per Alvfors ◽  
Jonas Forsman ◽  
Laszlo Sarközi
Keyword(s):  
Fuel Cell ◽  
Heat Production ◽  
Heat Recovery ◽  
District Heating ◽  
Original System ◽  
Heating System ◽  
Cogeneration Plant ◽  
District Heating System ◽  
Air Preheater ◽  
Vapor Cloud

Abstract This study presents some of the experiences gained during a two year operational period of a decentralized fuel cell cogeneration plant installed in southern Sweden. Various modifications to the system are described, most notably a plume eliminator for the reduction of an undesirable vapor cloud emitted by the original system. Aside from vapor cloud elimination, the plume eliminator allows for more efficient plant operation, as a larger fraction of the system cooling requirements can be shifted to the district heating system. In-field measurements show a 17 to 26% increase in district heat production with use of the plume eliminator, depending upon the season of operation (winter or summer). The study also presents two options for added heat recovery, which are employed in conjunction with the plume eliminator: an air preheater module; and an air preheater/humidifier module. Calculations show that air preheating has a small but measurable impact on heat recovery (an additional 8% gain), while combined air preheating and humidification allows for nearly a 50% increase in district heat production.

The Energy-Saving Analysis of District Heating System

2012 ◽  
Vol 193-194 ◽  
pp. 152-156
Author(s):  
Xian Liang Yang ◽  
Juan Juan Chen ◽  
Guo Hua Shi
Keyword(s):  
Power Consumption ◽  
Energy Saving ◽  
District Heating ◽  
Heating System ◽  
District Heating System ◽  
Quality Adjustment ◽  
Quantitative Ratio ◽  
Secondary Network ◽  
Quantity Adjustment ◽  
Adjustment Scheme

This paper introduces the adjustment curve equations of district heating system commonly used in secondary network. On this basis, adjustment curve equations of the adjustment that combines quantity adjustment and quality adjustment are proposed. Then taken a community in Zhangjiakou as an example, we compare the power consumption of the adjustment scheme proposed in the paper with that of quality adjustment and quality adjustment with different quantitative ratio in each period. The analysis shows that the adjustment scheme has much more potential in energy-saving.

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