PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 8

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  współczynnik wydajności
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Energetyczno-ekonomiczna analiza instalacji ogrzewania budynku wyposażonej w sprężarkową pompę ciepła. Cz. 1 - Zasada działania i budowa sprężarkowych pomp ciepła
Zmywaczyk Janusz, Koniorczyk Piotr, Wizor Małgorzata
Ciepłownictwo, Ogrzewnictwo, Wentylacja
|
2022
|
T. 53, nr 3
39--44
PL
Przedmiotem badań była sprężarkowa pompa ciepła solanka/ woda WPC 13 o mocy grzewczej 13,2 kW. Stanowisko badawcze znajdowało się w budynku jednorodzinnym o całkowitej powierzchni 340 m2 [1]. Dolnym źródłem pompy ciepła był zbiornik wody zlokalizowany obok budynku. W artykule opisano budowę i zasadę działania sprężarkowych pomp ciepła, ich klasyfikację i podstawowe parametry oraz stosowane rozwiązania konstrukcyjne instalacji pozyskiwania ciepła niskotemperaturowego.
EN
The test subject was a WPC 13 compressor brine/water heat pump with a heating capacity of 13.2 kW. The test site was located in a single-family building with a total area of 340 m2 [1]. The heat pump was adapted to cooperate with a low-temperature heat exchanger, which was a water tank located next to the building. The construction and principle of operation of compressor heat pumps, their classification and basic parameters as well as the applied construction solutions in relation to the bottom heat sources are presented.
2
Content available Review of mechanical vapour compression refrigeration system part 2: performance challenge
Mahmood R. A., Ali O. M., Al-Janabi A., Al-Doori G., Noor M. M.
International Journal of Applied Mechanics and Engineering
|
2021
|
Vol. 26, no. 3
119--130
EN
Reducing energy consumption and providing high performance for a vapour compression refrigeration system are big challenges that need more attention and investigation. This paper provides an extensive review of experimental and theoretical studies to present the vapour compression refrigeration system and its modifications that can be used to improve system’s performance and reduce its energy consumption. This paper also presents the challenges that can be considered as a gab of research for the future works and investigations. Cooling capacity, refrigerant effect, energy consumption can be improved by using vapour injection technique, natural working fluid, and heat exchanger. Based on the outcome of this paper, vapour injection technique using natural refrigerant such as water can provide ultimate friendly refrigeration system. Future vision for the vapour compression refrigeration system and its new design technique using Computational Fluid Dynamic (CFD) is also considered and presented.
3
Content available Adsorptive solar refrigerators based on composite adsorbents 'silica gel – sodium sulphate'
Belyanovskaya Elena A., Pustovoy Grigoriy N., Sukhyy Kostyntyn M., Sergiyenko Yana O., Yeromin Oleksandr O., Prokopenko Elena ., Gubinsky Mikhailo V., Kizek Ján, Lukáč Ladislav
Civil and Environmental Engineering Reports
|
2019
|
Vol. 29, no. 3
200--208
EN
The operation processes of adsorptive solar refrigerators based on composite adsorbents ‘silica gel - sodium sulphate’ were studied. The correlation between the adsorbent composition and the coefficient of the energy performance of the device was stated. As a consequence of the decreasing of adsorbent mass, the coefficient of performance is increased when sodium sulphate content in the composite increased. Effect of the regeneration process parameters on the composite on the coefficient of performance of the adsorptive refrigenerator was stated. The growth of the coefficient of performance is shown to result from decreasing the difference between adsorbent temperature and regeneration temperature from 85 to 55°C. The maximum values of the coefficient of performance of studied solar adsorptive refrigenerator about of 1.14 are stated for composites containing about 20 wt. % silica gel and 80 wt. % sodium sulphate.
4
Content available Air–water heat pump applied as water boiler in singlefamily house, coefficient of performance analysis under the real conditions
Lisowska-Lis A., Leszczyński R.
Science, Technology and Innovation
|
2018
|
Vol. 3, no. 2
58--61
EN
The subject of the research was an air-water heat pump, model PCUW 2.5kW from HEWALEX, installed in a single-family house. The pump is only used for heating water. The research was carried out from 25-08-2017 to 18-09-2017 in the village of Zborowice, in Malopolska region, Poland. The data were recorded from the heat pump system: temperature of the lower heat source (external air), temperature of the upper heat source (water temperature in the tank), time of heat pump was calculated during the analysed cycle of work and electrical energy consumption. The Coefficient Of Performance (COP) of the analysed air-water heat pump was determined. The analysis of the results was carried out using the MATLAB and EXCEL statistical tools. The correlation between COP coefficient and external air temperature is strong: 0.67.
5
Content available Modeling the performance of water-zeolite 13X adsorption heat pump
Kowalska K., Ambrożek B.
Archives of Thermodynamics
|
2017
|
Vol. 38, no. 4
191–-207
EN
The dynamic performance of cylindrical double-tube adsorption heat pump is numerically analysed using a non-equilibrium model, which takes into account both heat and mass transfer processes. The model includes conservation equations for: heat transfer in heating/cooling fluids, heat transfer in the metal tube, and heat and mass transfer in the adsorbent. The mathematical model is numerically solved using the method of lines. Numerical simulations are performed for the system water-zeolite 13X, chosen as the working pair. The effect of the evaporator and condenser temperatures on the adsorption and desorption kinetics is examined. The results of the numerical investigation show that both of these parameters have a significant effect on the adsorption heat pump performance. Based on computer simulation results, the values of the coefficients of performance for heating and cooling are calculated. The results show that adsorption heat pumps have relatively low efficiency compared to other heat pumps. The value of the coefficient of performance for heating is higher than for cooling
6
Content available Portable heat pump testing device
Kłosowiak R., Bartoszewicz J., Urbaniak R.
International Journal of Applied Mechanics and Engineering
|
2015
|
Vol. 20, no. 3
657--662
EN
The aim of this paper is to present the design and working principle of a portable testing device for heat pumps in the energy recirculation system. The presented test stand can be used for any refrigerating/reverse flow cycle device to calculate the device energy balance. The equipment is made of two portable containers of the capacity of 250 liters to simulate the air heat source and ground heat source with a system of temperature stabilization, compressor heat pump of the coefficient of performance (COP) of = 4.3, a failsafe system and a control and measurement system.
7
Content available remote Technical and economic aspects of photovoltaic conversion of Southern Poland
Rodziewicz T., Zaremba A., Wacławek M.
Ecological Chemistry and Engineering. S
|
2014
|
Vol. 21, nr 2
337--351
EN
The article presents the results of a 13-year tests and analysis of performance and energy and electrical charge yield for typical photovoltaic modules made of different absorbers. Modules were installed on the south wall of Opole University building (at kard. B. Kominka Street). Registered in this period (2001-2013) values energy and charge of tested modules are presented in reference to 1 Wp their nominal power and to 1 m2 of PV modules. Their annual and monthly distributions, with particular emphasis on the seasonal changes of its parameters and phenomena of aging and degradation of the PV modules structure were shown. In the final part of the article was presented an economic analysis of the profitability of investment in 20 kWp grid connected PV system with and without implemented the program to support investment in renewable energy, which respect to the newly implemented in Poland Act on RES.
PL
W artykule przedstawiono wyniki 13-letniej analizy testowania sprawności oraz uzysku energii i ładunku elektrycznego typowych modułów fotowoltaicznych wykonanych z różnych absorberów, zainstalowanych na południowej ścianie budynku Uniwersytetu Opolskiego przy ulicy kard. B. Kominka. Zarejestrowane w tym okresie (2001-2013) wartości kumulacji energii i ładunku testowanych modułów przedstawiono zarówno w odniesieniu do 1 Wp ich mocy nominalnej, jak i do 1 m2 powierzchni modułów PV. Przedstawiono ich roczne i miesięczne rozkłady ze szczególnym uwzględnieniem sezonowości zmian ich parametrów oraz zjawiska starzenia i degradacji struktury modułów PV. W końcowej części artykułu zaprezentowano ekonomiczną analizę opłacalności 20 kWp inwestycji PV typu Grid Connected bez i z wdrożonym programem wsparcia inwestycji w OZE, tj. uwzględniające zapisy nowo wdrażanej w Polsce Ustawy o OZE.
8
Content available Operation of an adsorption chiller in different cycle time conditions
Szyc M., Nowak W.
Chemical and Process Engineering
|
2014
|
Vol. 35, nr 1
109--119
EN
This paper is devoted to application of adsorption process for cooling power generation in a cooling devices. Construction and working principle of a water-silica gel adsorption chiller has been presented and the basic refrigeration cycle has been discussed. The article outlines behavior of a single-stage adsorption system influenced by changes in cycle time. The effect of cycle time and inlet chilled water temperatures on the main system performance parameters has been analysed.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.