The Engineering Practice of a CCHP System With the Condensation Heat Recovery of the Flue Gas in China

2013 ◽  
Author(s):  
Xiling Zhao ◽  
Lin Fu ◽  
Xiao Wang
Keyword(s):  
Flue Gas ◽  
Heat Recovery ◽  
Combustion Engine ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Engineering Practice ◽  
Cooling Mode ◽  
Heating And Cooling ◽  
Operation Status ◽  
Combined Cooling

As an energy-saving and environmentally friendly technology, the combined cooling heating and power system (CCHP) had been applied in the field of heating and air conditioning. Chinese researchers recently designed a CCHP system with the condensation heat recovery of the flue gas, which composed of a gas-powered internal combustion engine (ICE), an exhaust-gas-driven absorption heat pump (AHP), a flue gas condensation heat exchanger (CHE), and other assistant facilities, such as pumps, fans, and end user devices. The system was built and operated in 2011. We tested the parameters of the system on the heating and cooling status from the ICE to the CHE, including the temperature and flux of water, the inlet and outlet parameters of different facilities, and the performance of different facilities for a typical operation status. Based on the test results, the overall COP of the system in the heating and cooling mode was computed, and the energy efficiency level was analyzed. The results indicated that the energy utilization efficiency is about 94% on the heating status, and the energy utilization efficiency is about 84% on the cooling status. These results could serve as a reference for designing or evaluating the CCHP systems.

Performance Study of the Engineering Practice of Urban Sewage Source Heat Pump System

2009 ◽  
Author(s):  
L. Fu ◽  
X. L. Zhao ◽  
J. Z. Zhu ◽  
B. M. Huang ◽  
T. He ◽  
...  
Keyword(s):  
Heat Pump ◽  
Operating Conditions ◽  
Engineering Practice ◽  
Cooling Mode ◽  
Pump System ◽  
Heat Pump System ◽  
Urban Sewage ◽  
Heating And Cooling ◽  
Operation Status ◽  
Sewage Source

As an energy-saving and environmentally friendly technology, the urban sewage source heat pump (USSHP) had been widely applied in the field of heating and air conditioning. Chinese researchers recently designed an urban sewage source heat pump system composed of a filth block device, a wastewater heat exchanger, a heat pump, and other assistant facilities, such as pumps, fans, and end user devices. The system was built in 2008, and has been in operation since then. We tested the parameters of the system on the heating and cooling status from the wastewater source to the heat pump, including the temperature and flux of sewage, the inlet and outlet parameters of different facilities, and the performance of different facilities for a typical operation status. Based on the test results, the overall COP of the system in the heating and cooling mode was computed, and the energy efficiency level was analyzed. Then a method was proposed to improve the system’s performance. After the improvements, the characteristic curves of the typical operation status were investigated. The results indicated that the heating COP is about 4.3, and the cooling COP is about 3.5 in the actual operating conditions. These results could serve as a reference for designing or evaluating urban sewage source heat pump systems.

scholarly journals Impact of waste heat recovery systems on energy efficiency improvement of a heavy-duty diesel engine

2017 ◽  
Vol 38 (3) ◽  
pp. 63-75 ◽  
Author(s):  
Zheshu Ma ◽  
Hua Chen ◽  
Yong Zhang
Keyword(s):  
Energy Efficiency ◽  
Diesel Engine ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Reduction Factor ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Container Ship ◽  
Large Container

Abstract The increase of ship’s energy utilization efficiency and the reduction of greenhouse gas emissions have been high lightened in recent years and have become an increasingly important subject for ship designers and owners. The International Maritime Organization (IMO) is seeking measures to reduce the CO2 emissions from ships, and their proposed energy efficiency design index (EEDI) and energy efficiency operational indicator (EEOI) aim at ensuring that future vessels will be more efficient. Waste heat recovery can be employed not only to improve energy utilization efficiency but also to reduce greenhouse gas emissions. In this paper, a typical conceptual large container ship employing a low speed marine diesel engine as the main propulsion machinery is introduced and three possible types of waste heat recovery systems are designed. To calculate the EEDI and EEOI of the given large container ship, two software packages are developed. From the viewpoint of operation and maintenance, lowering the ship speed and improving container load rate can greatly reduce EEOI and further reduce total fuel consumption. Although the large container ship itself can reach the IMO requirements of EEDI at the first stage with a reduction factor 10% under the reference line value, the proposed waste heat recovery systems can improve the ship EEDI reduction factor to 20% under the reference line value.

scholarly journals Thermodynamic Analysis of Combined Cooling Heating and Power System with Absorption Heat Pump Based on Small Modular Lead-based Reactor

2021 ◽  
Vol 245 ◽  
pp. 01025
Author(s):  
Han Wang ◽  
Dali Yu ◽  
Chi Xu ◽  
Muhammad Salman Khan ◽  
Yunqing Bai
Keyword(s):  
Heat Pump ◽  
Thermodynamic Analysis ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Outlet Temperature ◽  
Pump System ◽  
Absorption Heat Pump ◽  
Remote Areas ◽  
Energy Demands ◽  
Combined Cooling

Small Modular Lead-based Reactor (SMLR) has generated great interest in academic research all around the world due to its good safety characteristics and relatively high core outlet temperature. In this paper, a Combined Cooling Heating and Power (CCHP) system with usage of absorption heat pump, which couples with a SMLR, was proposed to fulfill the energy demands in remote areas. Thermodynamic analysis was implemented to improve the performance of the CCHP system based on SMLR. To meet the remote areas’ energy needs, the main parameters and mass flow rate of a 35 MWth SMLR design were analyzed. The SMLR CCHP with absorption heat pump system can provide electric power 12.5MWe, heating 9.5MWh, and cooling 2.54MWc. The total energy utilization efficiency of the system can be 69.12 %. This work can provide a reference in the design and optimization of the CCHP system to meet the energy demands in the remote areas.

Analysis of Exergy Utilization Efficiency of Combined Cooling Heating & Power on Gas Engine-Driven Heat Pump System

2010 ◽  
Vol 171-172 ◽  
pp. 350-353
Author(s):  
Lin Qiu ◽  
Qiang Li
Keyword(s):  
Heat Pump ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Thermal System ◽  
Pump System ◽  
Heat Pump System ◽  
Gas Engine ◽  
Operational Models ◽  
Combined Cooling

The exergy utilization efficiency is the better reasonable to measure quantity and quality of thermal system then energy utilization efficiency .This text analyzed the exergy utilization efficiency of gas engine-driven heat pump(GEHP) at different combined supply energy modes. . Simulation computes gives that the heat recover plays the important action for increases exergy utilization efficiency of GHP system, especially at combined heating and electricity operational models, and the rules of heat recollection ratio and heat recollection temperature to exergy utilization efficiency of CHCP system were provided.

Application Analysis of the BCHP System with the Soil Source Absorption Heat Pump Driven by the Flue Gas

2012 ◽  
Vol 170-173 ◽  
pp. 2747-2750
Author(s):  
Xi Ling Zhao ◽  
Zhong Hai Zheng ◽  
Lin Fu ◽  
Yan Li
Keyword(s):  
Heat Pump ◽  
Flue Gas ◽  
Waste Heat ◽  
Combustion Engine ◽  
Critical Issue ◽  
Water Steam ◽  
Absorption Heat Pump ◽  
Efficient Integration ◽  
One Year ◽  
Combined Cooling

How to use the waste heat deeply are a critical issue for BCHP (Building combined cooling heating and power) system. A BCHP system with a soil source absorption heat pump driven by the waste heat is proposed. The system is composed of an internal combustion engine, a soil source absorption heat pump driven by the flue gas, and other assistant facilities, such as pumps, fans, and end user devices. In the winter, the flue gas is used to drive absorption heat pump to recover the waste heat of the soil source and the condensation heat of the flue gas simultaneously, and in the summer, the waste heat of the flue gas is used to drive absorption heat pump to cooling, and the heat sink is the soil. In the paper, the configuration of this kind of system is designed, and the energy analysis of the system is done all the year. Compared with the conventional BCHP system, the operation cost is lowered greatly and the increased investment could be returned within one year. It is show that the system is the efficient integration of cleaning energy, renewable energy, the discharge of the flue gas could be reduced to below 30°C, and the water steam could be catch to avoid the white smoke of the stack. The energy saving in space heating could be 66% compared with the conventional BCHP systems.

Modeling and Optimal Operation of a Network of Energy Hubs System With Distributed Energy Resources

2017 ◽  
Author(s):  
Shixi Ma ◽  
Dengji Zhou ◽  
Huisheng Zhang ◽  
Zhenhua Lu
Keyword(s):  
Power Plants ◽  
High Efficiency ◽  
Combustion Engine ◽  
Optimal Operation ◽  
Energy Resources ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Small Scale ◽  
Distributed Energy

Energy hubs is a functional unit which is capable of transporting transforming and storing of several kinds of energy. Several hubs can be combined as a network and achieve higher efficiency by exchanging energy with each other. A framework to assist the decision-making process towards the optimal integration of independent small scale distributed energy systems and traditional large scale CHP power plants is presented using an energy supply system in Shanghai as a case study. A model of this complex network of energy hubs with renewable energy resources is presented based on energy flow between its constituent elements. Furthermore, GA optimization method is presented for short term 24-hour optimal operation. Case study are undertaken on a 7-node energy system which comprises 4 energy hubs and 3 load hubs. Results validate the high efficiency of this system. Two cases with and without internal-combustion engine failure within the network are considered. The results showed that the proposed system can enhance the energy utilization efficiency and reduce the system operation cost, even under a system contingency.

scholarly journals Energy Saving in Processes Using Simple Thermodynamic Models of Utilities

1997 ◽  
Author(s):  
Petr Stehlík ◽  
Aleš Fiaia ◽  
Zdeněk Hajný
Keyword(s):  
Energy Saving ◽  
Flue Gas ◽  
Process Design ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Emissions Reduction ◽  
Steam Turbines ◽  
Thermodynamic Models ◽  
Heating And Cooling ◽  
Steam Boilers

Maximizing heat recovery in the heat exchanger network has to be considered as one of basic steps in a process design. Heating and cooling duties not serviced by heat recovery must be provided by external utilities. Simple thermodynamic models of various types of utilities (furnaces, steam boilers, steam turbines, gas turbines) are described in this paper. These models provide us with a tool for the analysis of utilities selection (provided the process heat and power demand are given), enable us to evaluate fuel burnt, power generated, costs for fuel and for exported/imported power and emissions (CO2, SO2) flowrates on a “local” or a “global” basis. This approach is convenient at the targeting stage of a design and can contribute to a substantial energy saving and flue gas emissions reduction.

A Study on Waste Heat Recovery in Drain Water with Water-to-Water Heat Exchanger in Barbershops

2012 ◽  
Vol 608-609 ◽  
pp. 1231-1235
Author(s):  
Fang Tian Sun ◽  
Na Wang ◽  
Xiao Gang Gong ◽  
Yun Ze Fan ◽  
De Ying Li
Keyword(s):  
Heat Exchanger ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Hot Water ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Waste Heat Recovery System ◽  
Heat Utilization ◽  
Water Heaters

Heat utilization efficiency of barbershop was about 16.7% in China, because the low-temperature waste water at 30～36°C was directly discharged into sewer. And match of energy grade was not appropriate, because electric water heaters were used to producing hot water at 55～70°C in most of barbershops. A waste heat recovery system with water-to-water heat exchanger (WHR-HE) was presented, according to heat utilization characteristics of barbershop and scientific principle of energy utilization. WHR-HE was analyzed by the first Law of thermodynamics and economics. The analyzed results show that energy consumption can be reduced about 75%, and incremental payback period is less one year for WHR-HE. There is optimal cold side temperature difference of water-to-water heat exchanger.

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