The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Zhu Yingxin - One of the best experts on this subject based on the ideXlab platform.

  • quasi dynamic energy saving judgment of electric driven seawater source heat pump district heating system over Boiler House district heating system
    Energy and Buildings, 2010
    Co-Authors: Shu Haiwen, Li Xiangli, Zhu Yingxin
    Abstract:

    Abstract The electric-driven seawater source heat pump district heating system is a renewable energy utilization system, but this cannot guarantee the energy-saving effect of the system. The static energy-saving judgment between this system and the conventional Boiler House district heating system was provided in a former research paper. However the static method has proved to be a very rough evaluation method and may lead to misjudgment as well. So a quasi-dynamic method, taking the total energy consumption during a whole heating season into consideration, is established in this paper. The energy-saving index turns out to be the expression of the lower limit of the average COP of the seawater source heat pump unit throughout the heating season (COPh,mc). Then a case study is presented to show how the index of COPh,mc and the actual average COP of the heat pump unit throughout the heating season (COPh,ma) are calculated. The calculation results show that the quasi-dynamic method improves the calculation accuracy dramatically, and thus provides a better solution to the quantitative energy-saving evaluation of the electric-driven seawater source heat pump district heating system.

  • Energy-Saving Potential of Seawater-Source Heat Pump District Heating System over Boiler-House District Heating System
    2009 International Conference on Energy and Environment Technology, 2009
    Co-Authors: Shu Haiwen, Li Xiangli, Zhu Yingxin
    Abstract:

    The seawater-source heat pump district heating system (SSHPDHS) is a renewable energy utilization system. However, under what conditions can the system achieve its energy-saving effect and how to evaluate its energy-saving potential are not very clear in practice, yet they are of vital importance for the popularization of the system in the cold coastal area. The paper derived an expression of the critical COP value of the heat pump unit for energy-saving (COPh,c) through the comparison of the SSHPDHS and the conventional Boiler-House district heating system (BHDHS) in energy consumption aspect. At the same time, the actual COP values of a heat pump unit (COPh,a) under different evaporator water temperatures are calculated out by an experiment data regression model on the basis of the manufacturer's dataset. Then the comparison of COPh,c and COPh,a under several typical scenarios are presented, which make the energy-saving judgement of an SSHPDHS and its energy-saving potential readily available. It concludes that the utilization of renewable energy of the SSHPDHS cannot guarantee its energy-saving effect due to the restriction of the actual COP value of a heat pump unit. It is also found that both the natural conditions of the seawater and the heating district radius (RH) are the most important factors that affect the energy-saving potential of the SSHPDHS.

  • Energy-saving criterion of seawater source heat pump district heating system
    Journal of Xi'an University of Architecture & Technology, 2009
    Co-Authors: Zhu Yingxin
    Abstract:

    As renewable energy utilization technology,whether a seawater source heat pump district heating system is really energy-saving has great significance on the popularization of the system along the seaside area in China.By the comparison between the system and the traditional Boiler House district heating system on energy consumption,an energy-saving criterion was deduced,which was the expression of the lower limit of the coefficient of heating performance of the seawater source heat pump unit(coph) in common engineering circumstances.The calculation results show that the lower limit of coph is not only raised with the enhancement of Boiler House heating efficiency but also with the increment of the heating district radius,and hence a relatively small-scale district heating area is more advantageous for the seawater source heat pump district heating system with respect to energy efficiency.

Lin Duanmu - One of the best experts on this subject based on the ideXlab platform.

  • field measurement and energy efficiency enhancement potential of a seawater source heat pump district heating system
    Energy and Buildings, 2015
    Co-Authors: Lin Duanmu, Haiyang Yu
    Abstract:

    Abstract As a renewable energy utilization system, seawater source heat pump district heating system can eliminate the local air pollution compared with the direct combustion of fuel in the conventional Boiler House district heating system in northern cold climate area. A field measurement with an emphasis on the energy efficiency of an actual seawater source heat pump district heating system was conducted and analyzed. The field measurement showed that the heat pump units consumed the largest part of energy consumption of the whole system (as high as 78.9% in the project). However, the coefficient of heating performance (COP) of the seawater source heat pump unit was as low as 2.43. Then the energy efficiency enhancement potential of the heat pump unit was carefully analyzed and calculated in the light of the index of Thermodynamic Perfectibility for the heat pump unit. And the results showed that there is about an average of 24.2% energy efficiency enhancement potential of the heat pump units in the project. In the end, a verification case study indicated that the COP of the heat pump units in the project will increase 34.6% if they are substituted by the ones made by another manufacturer.

  • Factor Analysis for Evaluating Energy-Saving Potential of Electric-Driven Seawater Source Heat Pump District Heating System Over Boiler House District Heating System
    Lecture Notes in Electrical Engineering, 2013
    Co-Authors: Haiwen Shu, Hongbin Wang, Lin Duanmu
    Abstract:

    Although the seawater source heat pump district heating system is often regarded as a renewable energy utilization system, it cannot be guaranteed to obtain the energy-saving effect. The authors provided an energy-saving judgement method for the electric-driven seawater source heat pump district heating system over the conventional Boiler House district heating system in former research. However, many factors will influence the energy efficiency of the system. In order to enhance its energy efficiency and make the best use of the system, detail analysis of those factors is conducted in the paper. First, an energy-saving potential evaluation model is derived for the system with part-time operation mode. Then all the factors influencing the energy efficiency of the system are ascertained and analyzed. These factors include the electricity generation efficiency, energy performance of seawater source heat pump units, the seawater temperature, the energy consumption of the seawater pump, the local outdoor air temperature, and the heating district radius. The research results are expected to provide clear directions for the seawater source heat pump system to raise its energy efficiency.

Haiyang Yu - One of the best experts on this subject based on the ideXlab platform.

  • field measurement and energy efficiency enhancement potential of a seawater source heat pump district heating system
    Energy and Buildings, 2015
    Co-Authors: Lin Duanmu, Haiyang Yu
    Abstract:

    Abstract As a renewable energy utilization system, seawater source heat pump district heating system can eliminate the local air pollution compared with the direct combustion of fuel in the conventional Boiler House district heating system in northern cold climate area. A field measurement with an emphasis on the energy efficiency of an actual seawater source heat pump district heating system was conducted and analyzed. The field measurement showed that the heat pump units consumed the largest part of energy consumption of the whole system (as high as 78.9% in the project). However, the coefficient of heating performance (COP) of the seawater source heat pump unit was as low as 2.43. Then the energy efficiency enhancement potential of the heat pump unit was carefully analyzed and calculated in the light of the index of Thermodynamic Perfectibility for the heat pump unit. And the results showed that there is about an average of 24.2% energy efficiency enhancement potential of the heat pump units in the project. In the end, a verification case study indicated that the COP of the heat pump units in the project will increase 34.6% if they are substituted by the ones made by another manufacturer.

Shu Haiwen - One of the best experts on this subject based on the ideXlab platform.

  • quasi dynamic energy saving judgment of electric driven seawater source heat pump district heating system over Boiler House district heating system
    Energy and Buildings, 2010
    Co-Authors: Shu Haiwen, Li Xiangli, Zhu Yingxin
    Abstract:

    Abstract The electric-driven seawater source heat pump district heating system is a renewable energy utilization system, but this cannot guarantee the energy-saving effect of the system. The static energy-saving judgment between this system and the conventional Boiler House district heating system was provided in a former research paper. However the static method has proved to be a very rough evaluation method and may lead to misjudgment as well. So a quasi-dynamic method, taking the total energy consumption during a whole heating season into consideration, is established in this paper. The energy-saving index turns out to be the expression of the lower limit of the average COP of the seawater source heat pump unit throughout the heating season (COPh,mc). Then a case study is presented to show how the index of COPh,mc and the actual average COP of the heat pump unit throughout the heating season (COPh,ma) are calculated. The calculation results show that the quasi-dynamic method improves the calculation accuracy dramatically, and thus provides a better solution to the quantitative energy-saving evaluation of the electric-driven seawater source heat pump district heating system.

  • Energy-Saving Potential of Seawater-Source Heat Pump District Heating System over Boiler-House District Heating System
    2009 International Conference on Energy and Environment Technology, 2009
    Co-Authors: Shu Haiwen, Li Xiangli, Zhu Yingxin
    Abstract:

    The seawater-source heat pump district heating system (SSHPDHS) is a renewable energy utilization system. However, under what conditions can the system achieve its energy-saving effect and how to evaluate its energy-saving potential are not very clear in practice, yet they are of vital importance for the popularization of the system in the cold coastal area. The paper derived an expression of the critical COP value of the heat pump unit for energy-saving (COPh,c) through the comparison of the SSHPDHS and the conventional Boiler-House district heating system (BHDHS) in energy consumption aspect. At the same time, the actual COP values of a heat pump unit (COPh,a) under different evaporator water temperatures are calculated out by an experiment data regression model on the basis of the manufacturer's dataset. Then the comparison of COPh,c and COPh,a under several typical scenarios are presented, which make the energy-saving judgement of an SSHPDHS and its energy-saving potential readily available. It concludes that the utilization of renewable energy of the SSHPDHS cannot guarantee its energy-saving effect due to the restriction of the actual COP value of a heat pump unit. It is also found that both the natural conditions of the seawater and the heating district radius (RH) are the most important factors that affect the energy-saving potential of the SSHPDHS.

V. A. Shakirov - One of the best experts on this subject based on the ideXlab platform.

  • Feasibility Study of Using Geothermal Heat-Pump Units for Substituting Small-Capacity Coal-Fired Boiler Houses (Taking the Baikal Natural Area as an Example)
    Thermal Engineering, 2020
    Co-Authors: I. Yu. Ivanova, V. A. Shakirov, M. V. Ermakov, F. S. Bukher
    Abstract:

    — The economic feasibility of substituting small-capacity coal-fired Boiler Houses with geothermal heat-pump units in the central ecological zone of the Baikal natural area is analyzed. Three versions of a space-heating system equipped with heat-pump units are considered depending on the source of low-grade heat and the method for extracting it: a well, a horizontal ground collector, and a water basin (Lake Baikal). The study is carried out for the raions of the Irkutsk oblast and the Republic of Buryatia located in the most favorable natural and climatic conditions in the southern part of the Baikal natural area’s central ecological zone, which have different economic conditions in terms of electricity tariffs and fuel cost. A conditional small-capacity coal-fired Boiler House having averaged technical characteristics is taken as the base version for comparing it with heat-pump units. A monovalent mode of heat-pump unit operation is considered taking into account a shift for using a low-temperature space-heating system. The economic feasibility of substituting a coal-fired Boiler House is estimated proceeding from the equality between the total discounted costs for implementing a space-heating system equipped with heat-pump units and costs for operation of the coal-fired Boiler House for the considered period of time. The dependences of the total discounted costs for the alternatives being compared have been obtained, using which it is possible to determine the level of electricity tariffs and coal prices at which the application of heat-pump units in the studied region becomes economically feasible. The influence of possible deviations of the conditions in a particular locality from the conditions typical for the analyzed regions that were adopted for consideration is taken into account. It can be concluded from the obtained results that, given the current prices for coal and electricity, it is not economically feasible to substitute small-capacity coal-fired Boiler Houses with heat-pump units under the natural and climatic conditions of the considered regions. The use of heat-pump units may become justified with a coal price equal to 5000–8000 rubles/t and electricity tariffs equal to 2–4 rubles/(kW h); in this case, the discounted payback period of investments will make approximately 30 years.

  • The Experience in Operation and an Efficiency Analysis for the Use of a Backpressure Steam Turbine Generator Unit in a Boiler House
    Thermal Engineering, 2019
    Co-Authors: V. A. Shakirov
    Abstract:

    Turbine generators can be used for utilization of the potential of steam lost in pressure-reducing and cooling units of operating Boiler Houses. This approach brings about an independent source of power the price of which can be much lower than the established tariff. The features in reconstruction of a Boiler House in the city of Bratsk, Irkutsk oblast, carried out in 2012 are examined. Steam generated in a KE-50-14-225 Boiler is routed to a 0.3–0.5 MPa common header for use in deaerators and steam-water heaters. Considering an increase in the electricity tariffs, a decision was made to install a 500-kW backpressure turbine generator in the Boiler House in parallel with the pressure-reducing unit to generate auxiliary power. The criteria for selecting the number and power of turbine generator units depending on the required steam generation, operating conditions of the consumer, the level of electric loads of the Boiler House, and the existing heat supply system are shown. The specifics in operation of the turbine generator unit are examined. To ensure safe and reliable operation of the unit, it is advisable to increase the number of monitored parameters through extension of the normal instrumentation system. The discounted payback period for the reconstruction cost and additional costs for installation of a second turbine generator unit are estimated. The Boiler House regimes, a change in the prices for fuel and electricity, and the operator’s labor cost are considered. After installation of the turbine generator, the specific fuel consumption for electricity generation amounts to 180 g.c.e /(kW h). In 2017, the electricity generation cost was 1.23 rubles/(kW h) with the average tariff of 2.13 rubles/(kW h). The discounted payback period for the performed reconstruction does not exceed 6 years, and that for further reconstruction is 8 years.