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 Pumps for Energy Saving of Building Hot Water Supply

2011 ◽  
Vol 347-353 ◽  
pp. 587-590
Author(s):  
Qing Hai Luo ◽  
Zheng Zuo
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Water Supply ◽  
Energy Saving ◽  
Heat Pump ◽  
Heat Pumps ◽  
Hot Water ◽  
Low Energy ◽  
Water Heaters ◽  
Hot Water Supply

This paper analyzes the energy consumption of hot water supply in buildings and the insurmountable shortcoming of low energy efficiency of conventional water heaters, and investigates the progress and problems of developing heat pump water heaters. It is pointed out that developing of heat pump water heaters is one of the efficient approaches to improve the energy efficiency of hot water supply.

scholarly journals The impact of selected heat pumps on CO2 emissions

2018 ◽  
Vol 45 ◽  
pp. 00071 ◽  
Author(s):  
Sławomir Rabczak ◽  
Danuta Proszak-Miąsik
Keyword(s):  
Energy Consumption ◽  
Heat Pump ◽  
Alternative Energy ◽  
Primary Energy ◽  
Heat Pumps ◽  
Hot Water ◽  
Renewable Sources ◽  
Alternative Energy Sources ◽  
Seasonal Heat ◽  
The Impact

The increase in energy consumption in the world, with the decreasing resources of conventional energy, is increasingly leading to campaigns aimed at limiting the acquisition of energy from non-renewable sources to intensify the use of alternative energy sources. The paper presents the possibilities of obtaining heat energy using a heat pump for heating purposes, ventilation and hot water preparation. Hot heat sources for the heat pump are discussed and their energy possibilities in relation to the geographical conditions of the territory of Poland. Variants of heat pump cooperation with renewable sources in the form of air, soil and water were adopted for analysis. Two cases of co-operation of the ground collector with the heat pump are also considered, in the form of vertical and horizontal wells of the heat exchanger type. Based on the known methodology of seasonal heat demand, the final and primary energy consumption was determined for each analyzed case together with auxiliary energy. Based on the calculations carried out, the final emission of carbon dioxide was determined for individual cases and they were compared with the emission that would be generated when producing heat using a gas boiler and heating network.

Some aspects of energy efficiency in the reconstruction of residential buildings in Ukraine.

2017 ◽  
Author(s):  
Rostyslav Sipakov ◽  
Dmytro Varavin
Keyword(s):  
Energy Efficiency ◽  
Water Supply ◽  
Alternative Energy ◽  
Residential Buildings ◽  
Hot Water ◽  
Accounting System ◽  
Heating Systems ◽  
Improve Energy Efficiency ◽  
Alternative Energy Sources ◽  
Hot Water Supply

The paper discusses the main aspects of the energy renovation of residential buildings. Measures to ensure the energy efficiency reconstruction of buildings are: thermo-building; the establishment of the accounting system and regulation of energy consumption; modernization of heating systems, hot water supply, ventilation, air conditioning and lighting; the use of local renewable and / or alternative energy sources; of the test as the heating, ventilation, airconditioning and hot water supply of buildings in accordance with the law; implementation of other measures to improve energy efficiency.

Studies of Heat Pumps Using Direct Expansion Type Solar Collectors

Solar Energy ◽  
2003 ◽  
Author(s):  
Sadasuke Ito ◽  
Naokatsu Miura ◽  
Yasushi Takano
Keyword(s):  
Heat Pump ◽  
Thermal Performance ◽  
Pressure Loss ◽  
Heat Pumps ◽  
Hot Water ◽  
Photovoltaic Module ◽  
Direct Expansion ◽  
Reduced Pressure ◽  
In Series ◽  
Hot Water Supply

A photovoltaic and thermal hybrid panel which was made of an aluminum roll -bond panel with a photovoltaic module on the surface was developed recently for use as an evaporator of a heat pump for residential hot water supply and room heating.1) Pressure loss of the refrigerant at the evaporator was large. Therefore, in the present study, shapes of the inlet and the outlet of the panel were modified to reduce pressure loss; also, thermal performance of the heat pump which adopted three evaporator panels connected in series was examined. Total area of the panels was about 1.9 m2 and the rated capacity of the compressor was 250 W. These modifications reduced pressure loss and improved thermal performance. The effect of the location of the feeler bulb on performance of the heat pump was also examined. It was inferred that the feeler bulb fixed on the tube at the outlet of the evaporator should be as close as possible to the evaporator outlet.

scholarly journals Comparison of Transcritical CO2 and Conventional Refrigerant Heat Pump Water Heaters for Domestic Applications

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 479
Author(s):  
Ignacio Paniagua ◽  
Ángel Álvaro ◽  
Javier Martín ◽  
Celina Fernández ◽  
Rafael Carlier
Keyword(s):  
Heat Pump ◽  
Thermodynamic Cycle ◽  
Heat Pumps ◽  
Design Tool ◽  
Operating Conditions ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Ambient Conditions ◽  
Water Heater ◽  
Water Heaters

Although CO 2 as refrigerant is well known for having the lowest global warming potential (GWP), and commercial domestic heat pump water heater systems exist, its long expected wide spread use has not fully unfolded. Indeed, CO 2 poses some technological difficulties with respect to conventional refrigerants, but currently, these difficulties have been largely overcome. Numerous studies show that CO 2 heat pump water heaters can improve the coefficient of performance (COP) of conventional ones in the given conditions. In this study, the performances of transcritical CO 2 and R410A heat pump water heaters were compared for an integrated nearly zero-energy building (NZEB) application. The thermodynamic cycle of two commercial systems were modelled integrating experimental data, and these models were then used to analyse both heat pumps receiving and producing hot water at equal temperatures, operating at the same ambient temperature. Within the range of operation of the system, it is unclear which would achieve the better COP, as it depends critically on the conditions of operation, which in turn depend on the ambient conditions and especially on the actual use of the water. Technology changes on each side of the line of equal performance conditions of operation (EPOC), a useful design tool developed in the study. The transcritical CO 2 is more sensitive to operating conditions, and thus offers greater flexibility to the designer, as it allows improving performance by optimising the global system design.

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 Energy-saving texnologies and alternative energy sources

2020 ◽  
Vol 8 ◽  
Author(s):  
Abdunabiyeva Noila Yusufjon qizi
Keyword(s):  
Geothermal Energy ◽  
Alternative Energy ◽  
Hot Water ◽  
Energy Sources ◽  
Energy Reserves ◽  
Coal Gas ◽  
Alternative Energy Sources ◽  
Key Issues ◽  
Hot Water Supply ◽  
Electricity Utilities

The energy problem is one of the most pressing issues in the world  is on the agenda of scientists working in the field of energy.  XXI  century with the development of science, rising technology creating the opportunity for a person to live normally, providing him with enough energy, food is one of the key issues.  Everyone knows digging  the energy reserves of its resources are declining.  But the need for it increased, and now the world's population has reached seven billion. There are the following types of energy sources that used by humanity: oil, coal, gas, atom, biomass, water, solar, wind, geothermal energy.  This energy sources can be divided into two types, respectively.  Biomass, water, sun, wind, geothermal energy - renewable;  oil, coal, gas, nuclear energy - non-renewable.  The energy from these resources is electricity, utilities such as energy consumed for services (heating of buildings, hot water supply) occurs in views.

scholarly journals Energy efficiency of multi-apartment residential houses with individual heat supply

2020 ◽  
Vol 212 ◽  
pp. 01011
Author(s):  
Vladimir Melnikov ◽  
Uladzimir Navaseltsau ◽  
Dzina Navaseltsava
Keyword(s):  
Water Supply ◽  
Flow Rate ◽  
Thermal Energy ◽  
Water System ◽  
Hot Water ◽  
Water Supply Systems ◽  
Hydraulic Systems ◽  
Circulation Mode ◽  
Hot Water Supply ◽  
Internal Networks

Centralized hot water systems widely used in Russia and Belarus are characterized by a considerable length and branching which inevitably leads to increased heat losses and to an unstable hydraulic system. The operation of the domestic hot water system in the circulation mode can be characterized by several parameters; one of which is the specific ratio of the cost of thermal energy for heating a cubic meter of hot water. The parameter is often regulated by law in Russia; exceeding this parameter is considered as administrative violation. The aim of the research is to determine the design and actual costs of thermal energy for hot water supply (hot water heating) and their comparison, analysis of the data obtained. The methodology for determining the design and real costs of thermal energy for hot water supply was to study the operation of the hot water supply system of a residential 144-apartment 9-storey building. The research showed that the actual circulating flow rate is much less than the calculated circulating flow rate. The authors note that in order to optimize the standard for heating a cubic meter of water it is necessary to observe the calculated circulation modes. This will require stabilization of the hydraulic systems of both the external and internal networks which is a difficult but feasible task. The research results are supposed to be taken into account when setting up existing hot water supply systems.

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