Study on Feasible Gas Price Formulation Principle for BCHP in China

2009 ◽  
Author(s):  
W. Bai ◽  
W. D. Long
Keyword(s):  
Natural Gas ◽  
Electric Power ◽  
Life Cycle Cost ◽  
Price Ratio ◽  
Heating Systems ◽  
Driven Systems ◽  
Electricity Cost ◽  
Air Source Heat Pump ◽  
Building Cooling ◽  
Gas Price

Taking three cities in China — Shanghai, Beijing and Chengdu — as examples, under different power price and natural gas price policies, and at the same output level, this paper compares Building Cooling Heating and Power system (BCHP) with the other four cooling/heating sources systems by economic analysis. This paper calculates Life Cycle Cost (LCC) of the five systems to determine which the best is and which the worst is. The author compares the LCC of power-driven cooling/heating systems with that of gas-driven systems especially when power users should pay the basic electricity cost according to the maximum power demand (MPD) or transformer capacity. This paper defines price ratio of electric power to natural gas, builds first-order linear regression equation of equivalent uniform annual cost (EUAC) ratio of BCHP to power-driven air source heat pump to calculate the feasible price ratio of electric power to natural gas. Accordingly, the author suggests that government should give preferential natural gas price subsidies policies to BCHP users.

Operation Modes and Economic Performance Study of 100kW Microturbine Building Cooling, Heating and Power Systems

2005 ◽  
Author(s):  
Jintao Huang ◽  
Zhenping Feng ◽  
Chen Yue ◽  
Li Liu
Keyword(s):  
Natural Gas ◽  
Economic Performance ◽  
Operation Time ◽  
Optimal Operation ◽  
Performance Study ◽  
Gas Engine ◽  
Operation Modes ◽  
Power Rate ◽  
Building Cooling ◽  
Gas Price

Microturbines are one of the most promising DG (Distributed Generation) technologies for Building Cooling, Heating and Power (BCHP) systems. They have advantages over other kinds of heat engines in terms of atmospheric emissions, fuel flexibility, noise, size, and vibration levels. The characteristics of the overall microturbine BCHP system may be different under various system configurations and operation modes which depend on the consumers and outdoor conditions. In this paper, on the basis of the authors’ previous work, the various possible operation modes are discussed under different external loads. The optimal operation modes are suggested to the microturbine BCHP schemes considering the various energy demands of a hotel in Xi’an. In the later part of this paper, the thermodynamic analyses and economic performance of microturbine BCHP system based on the first and the second laws of thermodynamics are carried out. The results show that even though the BCHP cogeneration system has the better economic performance both from the first and second laws evaluation, the benefits are affected by the operation modes because of the load uncertainty. The influence factors on the performance, such as power rate, natural gas price, operation time, are analyzed and compared for microturbine and gas engine BCHP systems. With the increase of natural gas price, or with the decrease of power rate, the economic performance advantages of both microturbine BCHP system and gas engine system are weakened, and the longer the cooling time, the shorter the payback periods for the system.

Research of Optimal Operation on Micro-Turbine CCHP System

2007 ◽  
Author(s):  
Wei Bing ◽  
Zhiwei Wang ◽  
Jiang Lu ◽  
Li Li
Keyword(s):  
Natural Gas ◽  
Power Systems ◽  
Recovery Period ◽  
Energy System ◽  
Optimal Operation ◽  
Distributed Energy System ◽  
Micro Turbine ◽  
Building Cooling ◽  
Gas Price ◽  
Combined Cooling

Nowadays the application of MT-CCHP (Micro-Turbine Combined Cooling Heating and Power) systems is becoming more and more popular. Based on the micro-turbine, MT-CCHP systems use the fuels of natural gas, marsh gas and gasoline etc., work via the micro-turbine and surplus heat energy of the gasses and supply the heating, cooling and power to the buildings. MT-CCHP system has the advantages of step utilization in energy, energy conservation and environment protection, and is one of the most important directions of distributed energy system. In this paper, according to the steps of optimal scheme, several operational schemes of CCHP systems for a selected building are studied. The objective functions and their constraints are determined so as to minimize the annual total cost. The selected schemes are optimized using a program. The most suitable scheme to the building is gained and the optimal strategy is proposed. At last, the relationship of the natural gas price, the micro-turbine price and the investment recovery period of CCHP are studied. All these above will be good references to the economic analysis of BCHP (Building Cooling Heating Power) system.

scholarly journals Energy Saving Potential of Radiant Floor Heating Assisted by an Air Source Heat Pump in Residential Buildings

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1321
Author(s):  
Yu-Jin Hwang ◽  
Jae-Weon Jeong
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Residential Buildings ◽  
Heating Systems ◽  
Air Source Heat Pump ◽  
Heating Capacity ◽  
Heating Loads ◽  
Radiant Floor Heating ◽  
Floor Heating ◽  
Floor Temperature

The objective of this research is to establish an appropriate operating strategy for a radiant floor heating system that additionally has an air source heat pump for providing convective air heating separately, leading to heating energy saving and thermal comfort in residential buildings. To determine the appropriate optimal operating ratio of each system taking charge of combined heating systems, the energy consumption of the entire system was drawn, and the adaptive floor surface temperature was reviewed based on international standards and literature on thermal comfort. For processing heating loads with radiant floor heating and air source heating systems, the heating capacity of radiant floor heating by 1 °C variation in floor temperature was calculated, and the remaining heating load was handled by the heating capacity of the convective air heating heat pump. Consequently, when the floor temperature was 25 °C, all heating loads were removed by radiant floor heating only. When handling all heating loads with the heat pump, 59.2% less energy was used compared with radiant floor heating only. Considering the local discomfort of the soles of the feet, the floor temperature is expected to be suitable at 22–23 °C, and 31.5–37.6% energy saving compared with those of radiant floor heating alone were confirmed.

scholarly journals Studying a Hybrid System Based on Solid Oxide Fuel Cell Combined With an Air Source Heat Pump and With a Novel Heat Recovery

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
Giulio Vialetto ◽  
Marco Noro ◽  
Masoud Rokni
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Electric Power ◽  
Heat Pump ◽  
Heat Recovery ◽  
Research Work ◽  
Solid Oxide ◽  
Coefficient Of Performance ◽  
Oxide Fuel ◽  
Air Source Heat Pump

In this paper, a new heat recovery for a microcogeneration system based on solid oxide fuel cell and air source heat pump (HP) is presented with the main goal of improving efficiency on energy conversion for a residential building. The novelty of the research work is that exhaust gases after the fuel cell are first used to heat water for heating/domestic water and then mixed with the external air to feed the evaporator of the HP with the aim of increasing energy efficiency of the latter. This system configuration decreases the possibility of freezing of the evaporator as well, which is one of the drawbacks for air source HP in Nordic climates. A parametric analysis of the system is developed by performing simulations varying the external air temperature, air humidity, and fuel cell nominal power. Coefficient of performance (COP) can increase more than 100% when fuel cell electric power is close to its nominal (50 kW), and/or inlet air has a high relative humidity (RH) (close to 100%). Instead, the effect of mixing the exhausted gases with air may be negative (up to −25%) when fuel cell electric power is 20 kW and inlet air has 25% RH. Thermodynamic analysis is carried out to prove energy advantage of such a solution with respect to a traditional one, resulting to be between 39% and 44% in terms of primary energy. The results show that the performance of the air source HP increases considerably during cold season for climates with high RH and for users with high electric power demand.

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