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    Wyświetlanie 1-8 z 8
    Tytuł:
    Criteria for selection of working fluid in low-temperature ORC
    Autorzy:
    Mikielewicz, D.
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/185262.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro CHP
    organic Rankine cycle
    mikro CHP
    organiczny cykl Rankine'a
    Opis:
    The economics of an ORC system is strictly linked to thermodynamic properties of the working fluid. A bad choice of working fluid could lead to a less efficient and expensive plant/generation unit. Some selection criteria have been put forward by various authors, incorporating thermodynamic properties, provided in literature but these do not have a general character. In the paper a simple analysis has been carried out which resulted in development of thermodynamic criteria for selection of an appropriate working fluid for subcritical and supercritical cycles. The postulated criteria are expressed in terms of non-dimensional numbers, which are characteristic for different fluids. The efficiency of the cycle is in a close relation to these numbers. The criteria are suitable for initial fluid selection. Such criteria should be used with other ones related to environmental impact, economy, system size, etc. Examples of such criteria have been also presented which may be helpful in rating of heat exchangers, which takes into account both heat transfer and flow resistance of the working fluid.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 3; 429-440
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experiences from operation of different expansion devices for application in domestic micro CHP
    Autorzy:
    Mikielewicz, D.
    Mikielewicz, J.
    Wajs, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240544.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro CHP
    ogrzewanie centralne
    rozbudowa urządzeń
    central heating
    expansion devices
    Opis:
    In the paper presented are experiences from operation of three different expansion devices for possible implementation in the domestic micro CHP. These were the modified scroll expander and two designs based on the variable working chamber volume pneumatic devices. Experiments showed the superiority of both "pneumatic devices" over the scroll expander, indicating the possible internal efficiencies in the range of 61 82Such efficiencies are very attractive, especially at the higher end of that range. The volume of these devices is much smaller than the scroll expander which makes it again more suitable for a domestic micro CHP. Small rotational velocities enable to conclude that connection to electricity grid will also be simpler in the case of "pneumatic devices". The "pneumatic devices" under scrutiny here could be an alternative to the typical vapour turbine in the ORC cycle, which is in the process of development at the IFFM.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 4; 3-13
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation of domestic micro-CHP based on the gas boiler fitted with ORC module
    Autorzy:
    Wajs, J.
    Mikielewicz, D.
    Bajor, M.
    Kneba, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/240505.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro-CHP
    organic Rankine cycle
    prototype domestic unit
    mikro CHP
    organiczny obieg Rankine'a
    Opis:
    The results of investigations conducted on the prototype of vapour driven micro-CHP unit integrated with a gas boiler are presented. The system enables cogeneration of heat and electric energy to cover the energy demand of a household. The idea of such system is to produce electricity for own demand or for selling it to the electric grid – in such situation the system user will became the prosumer. A typical commercial gas boiler, additionally equipped with an organic Rankine cycle (ORC) module based on environmentally acceptable working fluid can be regarded as future generation unit. In the paper the prototype of innovative domestic cogenerative ORC system, consisting of a conventional gas boiler and a small size axial vapour microturbines (in-house designed for ORC and the commercially available for Rankine cycle (RC)), evaporator and condenser were scrutinised. In the course of study the fluid working temperatures, rates of heat, electricity generation and efficiency of the whole system were obtained. The tested system could produce electricity in the amount of 1 kWe. Some preliminary tests were started with water as working fluid and the results for that case are also presented. The investigations showed that domestic gas boiler was able to provide the saturated/superheated ethanol vapour (in the ORC system) and steam (in the RC system) as working fluids.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 3; 79-93
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical model of a plate fin heat exchanger operating under solid oxide fuel cell working conditions
    Autorzy:
    Kupecki, J.
    Badyda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/240703.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plate fin
    heat exchanger
    micro-CHP
    SOFC
    modeling
    płytka
    wymiennik ciepła
    mikro CHP
    modelowanie
    Opis:
    Heat exchangers of different types find application in power systems based on solid oxide fuel cells (SOFC). Compact plate fin heat exchangers are typically found to perfectly fit systems with power output under 5 kWel. Micro-combined heat and power (micro-CHP) units with solid oxide fuel cells can exhibit high electrical and overall efficiencies, exceeding 85%, respectively. These values can be achieved only when high thermal integration of a system is assured. Selection and sizing of heat exchangers play a crucial role and should be done with caution. Moreover, performance of heat exchangers under variable operating conditions can strongly influence efficiency of the complete system. For that reason, it becomes important to develop high fidelity mathematical models allowing evaluation of heat exchangers under modified operating conditions, in high temperature regimes. Prediction of pressure and temperatures drops at the exit of cold and hot sides are important for system-level studies. Paper presents dedicated mathematical model used for evaluation of a plate fin heat exchanger, operating as a part of micro-CHP unit with solid oxide fuel cells.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 4; 3-21
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation on a rotodynamic pump operating in the cogeneration system with a low-boiling working medium
    Autorzy:
    Kaczmarczyk, T.
    Żywica, G.
    Ihnatowicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/175328.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    organic rankine cycle
    micro-CHP
    rotodynamic peripheral pump
    low-boiling medium
    HFE7100
    Opis:
    The article presents the research carried out on the circulating rotodynamic pump (peripheral pump) operating in the organic Rankine cycle with or without regeneration. The low-boiling solvent HFE7100 was used as the working fluid. Its boiling point is around 61 ◦C at atmospheric pressure. An expansion valve, which simulated the operation of an expansion machine, was used to load the tested pump. The flow characteristics were given for the working media: a solution of glycol and HFE7100 in the condenser, thermal oil and HFE7100 in the evaporator and HFE7100 in the regenerator. The research results concerning the PK70 pump operating in an ORC cycle are reported for the HFE7100 temperature range 15-60 ◦C and the dynamic viscosity range of 0.132 to 0.66 mPas. The maximum flow rate and pressure of the pump during its operation in the ORC system were assessed. The analysis of the results demonstrates that the maximum efficiencies of the pump operating with or without regeneration were 44% and slightly below 37%, respectively. The impact of the selected physicochemical parameters of the working mediums on the pressure drops occurring in the ORC cogeneration installation was discussed. Based on the research conducted and the measurement results, the possibility to apply a PK70 unit as a circulating pump for the working medium in an ORC cycle was checked.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 63-87
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The theoretical model of the transient behaviour for the micro combined heat and power organic Rankine cycle
    Teoretyczny model ciągły dla obiegu kogeneracyjnego ORC
    Autorzy:
    Matysko, R.
    Mikielewicz, J.
    Ihnatowicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/172873.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    układ mikro CHP
    obieg ORC
    modelowanie dynamiczne
    wymiana ciepła
    micro CHP system
    ORC cycle
    dynamical modelling
    heat transfer
    Opis:
    W pracy przedstawiono wyniki obliczeń obiegu ORC w warunkach eksploatacyjnych. Przeprowadzone obliczenia umożliwiają określenie bezwładności układu podczas zmiany obciążeń cieplnych parownika i skraplacza. Z obliczeń uzyskano czasy bezwładności oraz parametry temperatury na dolocie do turbiny i skraplacza dla czynnika R123. Bardzo zbliżone wyniki obliczeń parametrów uzyskanych z własnego modelu obiegu ORC do przeprowadzonego niezależnie eksperymentu dają podstawy do stwierdzenia, że model dobrze odzwierciedla układy rzeczywiste. Podkreślić należy fakt, że obliczenia dynamiki obiegu za pomocą tego modelu przeprowadzono dla różnych czynników roboczych (R123, HFE7100, propan) uzyskując dobre jakościowo wyniki, co pozwala poszerzyć zakres jego stosowalności również na inne czynniki robocze. Wyniki własnych obliczeń porównano z badaniami eksperymentalnymi obiegu ORC innych autorów uzyskując dobrą zgodność.
    This article presents results of calculations of the organic Rankine cycle (ORC) in working conditions. The calculations make it possible to define the inertia of the evaporator and condenser while the heat loads change occurs. Calculations allow to get the inertia of the system, and the parameters of temperature at the inlet to the turbine and condenser for the R123 refrigerant. Very similar calculations results of the parameters were obtained from own model for ORC cycle, and experiment results performed independently gave basis to conclude that the model well reflects the real systems. It should be emphasized that the dynamics calculations for the cycle prepared by this model was conducted for different working fluids (R123, HFE7100, propane). Good quality of the results from these calculations, allows to expand the scope of the model applicability to other working fluids. Our own results of calculations were compared with other authors experimental studies of the ORC cycle obtaining a good compliance.
    Źródło:
    Archiwum Energetyki; 2012, 42, 2; 93-102
    0066-684X
    Pojawia się w:
    Archiwum Energetyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of the thermodynamic parameters in failure conditions of the micro-CHP cycle
    Autorzy:
    Matysko, R.
    Mikielewicz, J.
    Ihnatowicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/239967.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro-CHP system
    transient model
    failure states
    multifuel boiler system
    heating system
    układ mikro CHP
    model przejściowy
    stan awaryjny
    kocioł
    system ogrzewania
    Opis:
    The paper presents the calculations for the failure conditions of the ORC (organic Rankine cycle) cycle in the electrical power system. It analyses the possible reasons of breakdown, such as the electrical power loss or the automatic safety valve failure. The micro-CHP (combined heat and power) system should have maintenance-free configuration, which means that the user does not have to be acquainted with all the details of the ORC system operation. However, the system should always be equipped with the safety control systems allowing for the immediate turn off of the ORC cycle in case of any failure. In case of emergency, the control system should take over the safety tasks and protect the micro-CHP system from damaging. Although, the control systems are able to respond quickly to the CHP system equipped with the inertial systems, the negative effects of failure are unavoidable and always remain for some time. Moreover, the paper presents the results of calculations determining the inertia for the micro-CHP system of the circulating ORC pump, heat removal pump (cooling condenser) and the heat supply pump in failure conditions.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 1; 43-59
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal oil biomass boiler dynamics as a part of the micro-CHP ORC plant
    Autorzy:
    Turzyński, T.
    Żywica, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/175454.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CHP
    boiler
    dynamics
    ORC
    micro-turbine
    thermal oil
    Opis:
    The aim of the paper is to present the results of experimental research conducted on two helical coil biomass boilers with oil heatingagent, which are acentral unitsof co generative micro powerplant designed and built in IFFM in Gdańsk. Experimental data served as a source for defining the interdependencies governing the dynamics of the micro-CHP as a whole. Furthermore, during the research the authors came across a few possible modifications to the construction that may yet improve the device.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 138; 3-11
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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