scholarly journals Assessment of heat pump efficiency for microclimate formation in a greenhouse

2018 ◽  
Vol 245 ◽  
pp. 06017 ◽  
Author(s):  
Polina Tretyakova
Keyword(s):  
Heat Pump ◽  
Thermal Energy ◽  
Closed Loop ◽  
Net Present Value ◽  
Cooling System ◽  
Heating System ◽  
Heat Pumps ◽  
Pump Efficiency ◽  
Present Value ◽  
The City

The article provides information about the ring heating system comprising heat pumps. The system is designed as a closed loop, which includes a pump, a thermal energy battery, and a heat pump. The evaporator is connected to the system of water intake from the well and the cooling system of air inside the greenhouse. The resulting thermal energy is consumed for the needs of heating and watering the greenhouse complex. We present a method for determining the dependence of the net present value on the temperatures in supply and return pipelines and temperature of low-potential heat source. The main economic indicators of the implementation of this system on a typical block greenhouse in the city of Tyumen are determined.

scholarly journals Analysis of the incremental cost method and the net present value method applied in the energy sector

2018 ◽  
Vol 49 ◽  
pp. 00075
Author(s):  
Tadeusz Noch ◽  
Zdzisław Kusto
Keyword(s):  
Incremental Cost ◽  
Net Present Value ◽  
Heating System ◽  
Heat Pumps ◽  
Third Party ◽  
Bank Loan ◽  
Heat Sources ◽  
Present Value ◽  
Optimal Heating ◽  
Selection Of

The study characterizes hybrid sources applied in the power industry, created with the use of unconventional energy sources. An example of cooperation of heat pumps and conventional sources was used. The article notes the technological progress also concerning heat exchangers. To calculate economic efficiency, the MKN Incremental Cost Method and the NPV Net Present Value method were used. The article refers to the calculation of investment outlays and operating costs and repayment of a bank loan for individual heat sources. The possibility of assuming separate values of discount rates for the installation of heat pumps and hybrid boilers as well as the comparative installation were shown. Also included is the possibility of adopting a separate discount rate for income derived from savings associated with the purchase of fuel and energy and the sale of heat to a third party consumer. The analysis covered the MKN Incremental Cost Method and the NPV Net Present Value method. The computational algorithm contains costs of hybrid installation with heat pumps and costs of a comparative conventional installation in a version without revenues and with revenues from the sale of heat. Presented is the method of calculating the net present value in the next year of operation, discounting to the zero year and observing in which year the positive value will be obtained. Economic calculations, according to popular views, are the basis for choosing the optimal heating variant. Ecological effects and social demand may provide additional separate criteria in the selection of the heating system.

Thermodynamic Analysis of Solar Heat Pump Assisted Heating Systems

2014 ◽  
Author(s):  
Zozan Siyahhan Türkgenç ◽  
Alican Çebi ◽  
Ali Celen ◽  
Ahmet Selim Dalkılıç ◽  
Somchai Wongwises
Keyword(s):  
Solar Energy ◽  
Heat Pump ◽  
Alternative Energy ◽  
Heating System ◽  
Heat Pumps ◽  
Pump System ◽  
Heat Pump System ◽  
Heating Systems ◽  
Solar Heat ◽  
The City

In this study, a system has been developed which can be used for heating buildings by utilizing solar energy, which is free and abundant in our country, with the aim of minimizing fossil based fuel consumption especially at wintertime and this system’s efficiency has been analyzed mathematically with numerical methods. First of all, in this study the performance of a solar heat pump system is examined. The city of Antalya is chosen for this study which is in the southern region of Turkey with an abundant source of solar energy. The usability of solar energy throughout the year is examined and its application areas in building heating with the utilization of heat pumps are determined. In addition an auxiliary system with an alternative energy source is considered in case solar energy is insufficient by itself. In order to determine all of the above, energy analysis of the system is performed. The advantages of the solar heat pump heating system are studied considering the amount of energy saved and the efficiency of the system. Thermodynamic and thermoeconomic analysis has been carried out in order to determine how effectively the solar energy is utilized by the system and the advantages of solar heat pump.

scholarly journals Upgrading a District Heating System by Means of the Integration of Modular Heat Pumps, Geothermal Waters, and PVs for Resilient and Sustainable Urban Energy

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2347
Author(s):  
Elżbieta Hałaj ◽  
Jarosław Kotyza ◽  
Marek Hajto ◽  
Grzegorz Pełka ◽  
Wojciech Luboń ◽  
...  
Keyword(s):  
District Heating ◽  
Heating System ◽  
Upper Jurassic ◽  
Heat Pumps ◽  
Water Levels ◽  
Energy Potential ◽  
Geothermal Waters ◽  
District Heating System ◽  
Heating And Cooling ◽  
The City

Krakow has an extensive district heating network, which is approximately 900 km long. It is the second largest city in terms of the number of inhabitants in Poland, resulting in a high demand for energy—for both heating and cooling. The district heating of the city is based on coal. The paper presents the conception of using the available renewable sources to integrate them into the city’s heating system, increasing the flexibility of the system and its decentralization. An innovative solution of the use of hybrid, modular heat pumps with power dependent on the needs of customers in a given location and combining them with geothermal waters and photovoltaics is presented. The potential of deep geothermal waters is based on two reservoirs built of carbonate rocks, namely Devonian and Upper Jurassic, which mainly consist of dolomite and limestone. The theoretical potential of water intake equal to the nominal heating capacity of a geothermal installation is estimated at 3.3 and 2.0 MW, respectively. Shallow geothermal energy potential varies within the city, reflecting the complex geological structure of the city. Apart from typical borehole heat exchangers (BHEs), the shallower water levels may represent a significant potential source for both heating and cooling by means of water heat pumps. For the heating network, it has been proposed to use modular heat pumps with hybrid sources, which will allow for the flexible development of the network in places previously unavailable or unprofitable. In the case of balancing production and demand, a photovoltaic installation can be an effective and sufficient source of electricity that will cover the annual electricity demand generated by the heat pump installation, when it is used for both heating and cooling. The alternating demand of facilities for heating and cooling energy, caused by changes in the seasons, suggests potential for using seasonal cold and heat storage.

scholarly journals Autonomous heating system during transformation of thermal energy formed in server stations

2021 ◽  
Vol 25 (1) ◽  
pp. 130-139
Author(s):  
Е.G. Komarov ◽  
◽  
V.V. Lozovetsky ◽  
V.V. Lebedev ◽  
V.M. Cherkina ◽  
...  
Keyword(s):  
Heat Pump ◽  
Thermal Energy ◽  
Air Conditioning ◽  
Heating System ◽  
Thermal Emissions ◽  
Power Resources ◽  
Central Heating ◽  
Exchange Processes ◽  
Material Power ◽  
The Mathematical Model

Results of design modeling of air-conditioning and central air of premises of server stations are presented. The estimation of thermal balance of typical server station is made. The potential of thermal energy which can be used is estimated it is useful for needs of central heating, to save power resources, and not to pollute environment thermal emissions. The detailed analysis of components of is material-power balance is made. The mathematical model of central air is developed for these purposes. Analysis problems of the heat substances exchange processes, the drainage of air connected with processes, occurring at its cooling are considered. The designing and operation problems interfaced with the heat substances exchange in air coolers are considered. The heat pump scheme of system is offered the central heating, utilizing warmly server station at air conditioning indoors. The model is offered and results of optimization of parameters heat pump schemes are considered. Results can be applied at designing of central airs of premises of server stations with passing recycling of thermal emissions for needs of central heating.

scholarly journals Prospect for the using of heat pumps for heating of buildings in enterprise

2020 ◽  
Author(s):  
Z. Sirkо ◽  
◽  
V. Korenda ◽  
I. Vyshnyakov ◽  
O. Protasov ◽  
...  
Keyword(s):  
Water Supply ◽  
Heat Pump ◽  
Thermal Energy ◽  
Alternative Energy ◽  
Thermodynamic Cycle ◽  
Heat Pumps ◽  
The State ◽  
Hot Water ◽  
Alternative Energy Sources ◽  
Hot Water Supply

Heat pump - a device for transferring thermal energy from a source of low potential thermal energy to a consumer with a higher temperature. The thermodynamic cycle of a heat pump is similar to a refrigerating machine. Depending on the principle of operation, heat pumps are divided into compression and absorption. The most commonly used compression heat pumps. In recent years, numerous publications on the use of heat pump technology in heating and hot water supply facilities of various spheres - from individual homes to residential neighborhoods have appeared in various media. The authors of the publication have many years of experience in joint scientific and technical cooperation with leading technical universities and industrial organizations in the field of development and practical use of heat pump technology. The authors analyze the possibilities of introducing heat pumps at enterprises and organizations of the State Reserve System of Ukraine. It has been shown that the amount of expenses in comparison with central heating or operation of gas and electric boilers of similar power is several times smaller. It is noted that the implementation of heat pumps is a promising direction in the use of alternative energy sources to meet the heating, ventilation and hot water supply needs of buildings. The payback period from the introduction of heat pumps at enterprises is 4-9 years, depending on the location of the object and the type of source of low-temperature heat. The article meets the requirements of the State Tax Code of Ukraine and can be recommended for publication.

Heat Integration of Absorption Heat Pump in a Milk Powder Dairy

2000 ◽  
Author(s):  
Jens Møller Andersen
Keyword(s):  
Heat Pump ◽  
Waste Heat ◽  
Cooling System ◽  
Milk Powder ◽  
Electricity Consumption ◽  
Heat Pumps ◽  
Heat Integration ◽  
Absorption Heat Pump ◽  
Absorption Cooling ◽  
Absorption Cooling System

Abstract Heat integration with absorption heat pumps requires investigation of many types of plant designs. In this article, it is concluded that in many cases high temperature absorption systems for heat recovery are more economically feasible than absorption systems for cooling purposes. The conclusion is based on a project where the scope was to investigate technical and economical possibilities for heat integration of an absorption heat pump in a milk powder plant. The first idea behind the project was to use the waste heat from the rejected air to drive an absorption cooling system to reduce the electricity consumption for cooling proposes. The model of the plant was based on simulations as a background for a time averaged COP model. It was concluded that an absorption system for generating low temperature steam is more feasible.

An Economical Analysis on a Solar Greenhouse Integrated Solar Assisted Geothermal Heat Pump System

2005 ◽  
Vol 128 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Onder Ozgener ◽  
Arif Hepbasli
Keyword(s):  
Heat Pump ◽  
Cooling System ◽  
Heat Pumps ◽  
Renewable Energy Resources ◽  
Ahp Method ◽  
Geothermal Heat ◽  
Pump System ◽  
Heat Pump System ◽  
Economical Analysis ◽  
Geothermal Heat Pump

The main objective in doing the present study is twofold, namely (i) to review briefly the utilization of geothermally heated greenhouses and geothermal heat pumps in Turkey, since the system studied utilizes both renewable energy resources and (ii) to present the Analytical Hierarchy Process (AHP) as a potential decision making method for use in a greenhouse integrated solar assisted geothermal heat pump system (GISAGHPS), which was installed in the Solar Energy Institute of Ege University, Izmir, Turkey. This investigation may also be regarded as the one of the limited studies on the application of the AHP method to GISAGHPs, as no studies on the GISAGHPS have appeared in the literature. In this context, an economic analysis is performed based on the life cycle costing technique first. The results are then evaluated by applying the AHP method to a study, which is a comparative study on the GISAGHPS and split system. The results indicated that the GISAGHPS is economically preferable to the conventional split heating/cooling system under Turkey’s conditions.

scholarly journals Experimental based determination of SCOP coefficient for ground-water heat pump

2018 ◽  
Vol 44 ◽  
pp. 00003
Author(s):  
Stanisław Anweiler ◽  
Maciej Masiukiewicz
Keyword(s):  
Heat Pump ◽  
Alternative Energy ◽  
Electrical Power ◽  
Heating System ◽  
Heat Pumps ◽  
Alternative Energy Sources ◽  
Thermal Output ◽  
Ground Source ◽  
Accredited Laboratory ◽  
Effective Use

The paper presents research related to the operation of an ground-source heat pump with a thermal output of 16.85 kW and an electrical power of 3.72 kW in various conditions, both from the mechanical and thermodynamic perspective. The publication contains the results of research on a selected heat pump model with an R410a refrigerant carried out in an accredited laboratory in the Czech Republic. Detailed analysis of the data in terms of changes in the COP coefficient for two heating water temperatures was carried out (35°C and 55°C) and in the range of outdoor air temperature from -10°C to 15°C every 1°C. The analysis was also carried out to determine the efficiency of the heat pump depending on the parameters of the heat source. Devices of this type, enabling effective use of environmental available thermal energy with low operating costs, meet increasingly stringent environmental protection requirements. Significant costs of heating buildings are one of the main reasons for the need to look for alternative energy sources. The heat resources contained in water, air and land are huge. Due to the fact that heat pump prices dropped significantly, and their efficiency has increased over the last few years, these devices are a real competition for conventional ways of supplying buildings with heat. Heat pumps do not require daily maintenance, are fully automated and have intuitive control. These features allow to use them as components in the system of a modern and intelligent household. It was shown that the SCOP of the tested device increased by 1% on average reaching SCOP = 4.71 for a typical external calculation temperature and for a low-temperature heating system (35°C).

scholarly journals Hybrid Carbon Dioxide Heat Pump for the Multifamily Residential Buildings in the Heat Supply System Based on CHP

2021 ◽  
pp. 91-98
Author(s):  
Mihail Sit ◽  
◽  
Anatoliy Juravliov ◽  
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Heat Supply ◽  
Single Phase ◽  
Control Valve ◽  
Heating System ◽  
Heat Pumps ◽  
Hydraulic Circuit ◽  
Heat Supply Systems ◽  
Supply Systems

The work is devoted to centralized heat supply systems based on CHP plants and the use with them heat pumps (HP) on carbon dioxide as refrigerant. Heat pumps are used in heat supply systems for buildings and use the heat of the outside air and, at the same time, the heat of the return network water (WWR) as a source of low-grade heat (LHP). The aim of the study is to develop a structural diagram of such a heat pump, where the outside air is heated by a heat exchanger installed in the return water line of the heating system, to develop a hydraulic circuit of a heat pump taking into account the law of regulation of the building heating system, to develop an algorithm for controlling the operating modes of the so-called balancing heat exchanger installed after gas cooler and internal heat exchanger of the heat pump. The most significant results were the hydraulic circuit of the heat pump, the aerodynamic circuit of the air supply path to the heat pump evaporator, the balancing heat exchanger control system, taking into account the requirement to ensure the operation of the control valve in a single-phase flow. The significance of the results obtained consisted in obtaining the dependences between the CO temperature graph and the parameters of the thermodynamic cycle of the heat pump, which ensured the operation of the control valve of the heat pump in a single-phase environment.

scholarly journals Revitalization of property asset on the Dumilah Waterpark through the infill development of new activities

2021 ◽  
Vol 778 (1) ◽  
pp. 012005
Author(s):  
E B Santoso ◽  
V K Siswanto ◽  
U Sulistyandari
Keyword(s):  
Net Present Value ◽  
Regional Scale ◽  
Payback Period ◽  
City Government ◽  
Internal Rate Of Return ◽  
Present Value ◽  
Infill Development ◽  
Financial Feasibility ◽  
The Government ◽  
The City

Abstract Property assets owned by the city government should provide high benefits as a source of regional income. The asset is aging so that its productivity will decrease. The government is trying to revitalize assets to make them more productive. The purpose of this study is to determine the best utilization that can provide the highest benefit. The method used to assess the development of these assets is through the high best use approach. Several alternatives to the use of assets compared with the analysis of financial feasibility include the calculation of IRR, NPV, PP, ROI. The utilization of property assets that is more profitable for landowners, based on the results of the FGDs that have been carried out there is an opportunity to build a supporting facility for the development of Dumilah Water Park as a Hotel and Convention Hall. Both of these facilities have considerable economic appeal to support the function of the city of Madiun as a center for trade and services on a regional scale. Based on the calculation of financial feasibility at Dumilah Water Park with an initial investment amount of Rp. 60,354,000,000.00 then the Net Present Value is obtained of Rp. 6,258,119. Likewise, the Internal Rate of Return was obtained at 11.41%, greater than the 10% interest rate. Meanwhile, the Payback Period of this investment is 8 years with an ROI of 10%.

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