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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Analysis of the geothermal energy use in powering various hybrid systems

100%
Piotrowska E., Skowronski P., Sypula M., Jankowski R.
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
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2017
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nr 70
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Ehksperimental'nye issledovanija teploobmena v ehlementakh termoakusticheskikh apparatov

86%
Korobko V., Moskovko O.
Motrol. Motoryzacja i Energetyka Rolnictwa
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2013
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tom 15
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nr 2
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Selected issues of the technical analysis of a heating system using the direct evaporation heat pump

86%
Tucki K., Sikora M., Karlikowska M., Bedkowski W.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2016
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tom 16
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nr 1
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The impact of the Polish renewable energy sector on employment

86%
Grandziuk P. L.
Economic and Regional Studies
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2022
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tom 15
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nr 4
5

Effect of the application of a heat pump to accumulate heat generated during deep litter fermentation on limiting ammonia emission in pig breeding

86%
Nawrocki L., Myczko A., Jugowar J. L.
Natural Sciences
|
2000
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tom 04
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Analysis of water-water type heat pump operation in a building object

72%
Knaga J., Szul T.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2011
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tom 11C
The paper presents operation examination results of a heating system equipped with a heat pump, manufactured by the Sekut company, equipped with a scroll type compressor. The performed statistical analysis has shown a significant influence of external temperature and heat transfer coefficient to the COP value. Within the analysed period, the COP maintained a level of 2.6 at an average monthly temperature of -6°C, with a transfer coefficient of 15%.
7
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Investigations into the influence of functional parameters of a heat pump on its thermal efficiency

72%
Szreder M.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2013
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tom 13
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nr 1
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Energy efficiency of ground heat exchangers co-operating with a compressor heat pump

72%
Kurpaska S., Latala H.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2012
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tom 12
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nr 1
9
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Analyzing temperature changes in the ground massif with a horizontal heat exchanger in the course of the heating season

72%
Adamovsky R., Neuberger P., Sed'ova M.
Infrastruktura i Ekologia Terenów Wiejskich
|
2010
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nr 11
The article is devoted to temperature changes in the ground massif with the horizontal heat exchanger as an energy source for a heat pump. The article was aimed at analyzing temperature changes in the ground massif with the horizontal heat exchanger at the beginning, in the course of and at the end of the heating season. Another aim was to analyze temperature differences in the area of the horizontal exchanger and the reference lot. The heat flow utilized in the evaporator of heat pump was extracted from the ground exchanger (nominal output at the condenser was 10.5 kW). Temperatures of the ground massif with the horizontal heat exchanger were measured in its plane in depths of 0.75 m, 0.5 m and 0.25 m. The temperature inside the ground massif on the reference lot and ambient parameters were measured as well. It is obvious that the difference of energetic potentials inside the ground massif with the heat exchanger and on the reference lot is insignificant at the beginning of the heating season. During the heating season, the difference of ground massif energetic potentials increases; at the end it is constant. The difference of temperatures in horizontal planes was not significant at the beginning of the heating season; however, it gradually increased. Maximum differences were detected in the area of the heat exchanger. In higher strata, the difference between temperatures decreases. During a major part of the heating season, temperatures at pipes of the ground exchanger were negative. This fact affected amounts of heat extracted from the ground massif.
10

Energy efficiency of small, compressor assisted air-water type heat pumps

72%
Knaga J.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2008
|
tom 08
11
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Selected issues of the economic analysis of a heating system with the direct evaporation heat pump

72%
Tucki K., Sikora M., Karlikowska M., Bedkowski W.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2016
|
tom 16
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nr 1
12
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Energy efficiency analysis of flat and vacuum solar collector systems

72%
Kurpaska S., Latala H., Knaga J.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2012
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tom 12
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nr 2
13

Changeability of heat output of heat pump with scroll type compressor

72%
Knaga J.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2007
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tom 07A
14

The results of a study of heat recovery and conversion from cowshed ventilation air

72%
Szulc R., Laska B.
Intercathedra
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2014
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tom 30
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nr 2
The heat obtained and converted from cowshed ventilation air was studied using an installation for heat recovery composed of a 3 kW fan coil unit with an output of 100 m3 ∙ h-1 and heat pumps with a capacity of 8 kW. The heat amounting to 0.346 GJ · day-1 was used to heat water in a 200dm3 buffer tank. Energy inputs averaged 47.34 kWh per day, and the efficiency index during the period was COP = 2.005. Measurements were performed from August to October and data from the heat meter and the thermometer were read at the same time every day. To increase the installation's efficiency (COP), it is necessary to increase the removal of heat. This is possible by means of additional heaters or a boiler for hot water, and by reducing the performance of the fan coil's circulation pump and decreasing the fluid flow rate to 0.3 m ∙ h-1 .
15
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Efficiency of the heat pump cooperating with various heat sources in monovalent and bivalent systems

72%
Kurpaska S., Latala H., Lapczynska-Kordon B., Mudryk K.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2012
|
tom 12
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nr 1
16
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Energy analysis of an air heat pump for hot water

72%
Szreder M.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2016
|
tom 16
|
nr 1
17
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The use of renewable energy resources in selected tourist facilities

72%
Kowalczyk-Jusko A., Koscik B., Teneta J.
Economic and Regional Studies
|
2016
|
tom 09
|
nr 1
Subject and purpose of work: The aim of the work is the analysis of possibilities of using different renewable energy sources (RES) in tourism facilities and the effects caused by such installations. Materials and methods: Empirical material is formed by tourist objects of different scale of service provision in which RES have functioned for several years and the users are able to assess the advantages and disadvantages of the applied solutions. Results: It was noted that depending on the type and location of an object and the demand for energy one may select such a source and method of conversion into usable energy which to the greatest degree fulfils these needs. Solar energy deserves special attention as the greatest potential occurs during the period of increased tourist traffic. Furthermore, solar energy may be processed into heat and electric energy including island systems. Conclusions: RES installations concern energy for tourist objects which has economic and environmental impact and furthermore they constitute tourist attraction. For objects located far from electricity grid they may constitute the basic source of energy.
18
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Analysis of the influence of variable insulating power of a storing tank on energy effects in the conversion system of solar radiation

58%
Kurpaska S., Latala H.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
|
2012
|
tom 12
|
nr 2
19
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Temperature changes in heat pump horizontal ground source

58%
Adamovsky R., Neuberger P., Sed'ova M.
Infrastruktura i Ekologia Terenów Wiejskich
|
2009
|
nr 07
The paper deals with assessment of thermal fields and temperature changes in ground massif with horizontal heat exchanger used as a heat source for a heat pump. Temperatures in the zone of the horizontal ground exchanger are compared with temperatures in a reference land. Changes of heat potential of the soil during the heating period are also assessed. Possibilities of recovery of thermal potential of the ground massif when utilizing vertical and horizontal exchangers are analyzed in the opening part of the paper. The results of the first verification indicated that average temperatures in the horizontal planes of the ground massif did not differ considerably with distance from the exchanger tube. Differences in average temperatures in reference and experimental lands confirmed sufficient heat potential of the ground massif even at the peak of the heating period. The differences in average temperatures reached up to 6.51 K in the end of the heating period while at the beginning of the heating period, the differences in average temperatures dropped to 1.35 K. The differences between maximum and minimum temperatures in the zone of the ground exchanger reached up to 1.9 K at the peak of the heating period and rose to 3.9 K at the beginning and end of the heating period. The first results of our measurements indicate the necessity of accumulation of thermal energy in the soil massif in the summer period like in case of the vertical exchangers.
20
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Rural houses heating costs

51%
Manteuffel Szoege H.
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
|
2008
|
tom 03(18)
Average full (including capital, operation and maintenance costs) annual heating costs in a standard family house with 180 m2 of floor surface are compared for various heating systems under the Polish economic conditions. The compared heating technologies comprise water to water and ground loop heat pumps with both vertical and horizontal loops, a liquid gas combustion furnace, an earth gas combustion furnace, a coal combustion furnace, a straw combustion furnace, a wood combustion furnace and an electric stove. A sensitivity analysis with regard to the interest rate and the value of owner’s work did not change the general conclusion that in most cases heat pumps were the cheapest, while oil and coal burning furnaces or an electric boiler the most expensive solutions. The cost of own labour was decisive for the appraisal of labour intensive systems.
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