Modeling and analysis of energetic and exergetic efficiencies of a LiBr/H20 absorption heat storage system for solar space heating in buildings

2015 ◽  
Vol 9 (2) ◽  
pp. 281-299 ◽  
Author(s):  
Maxime Perier-Muzet ◽  
Nolwenn Le Pierres
Keyword(s):  
Heat Storage ◽  
Storage System ◽  
Space Heating ◽  
Modeling And Analysis

The Possibility of Using the Ground as a Seasonal Heat Storage: The Numerical Study

2004 ◽  
Author(s):  
Pawel Olszewski
Keyword(s):  
Solar Energy ◽  
Heat Storage ◽  
Numerical Study ◽  
Storage System ◽  
Heating System ◽  
Numerical Code ◽  
Space Heating ◽  
Solar Collectors ◽  
Seasonal Heat ◽  
The One

Humankind can effectively utilize only part of the solar energy reaching a surface of the Earth. It is due to the low density of the solar radiation and its unfavorable distribution. The majority of solar energy falls to the low latitude countries, where space-heating requirements are marginal. In these countries the solar heat is used for preparing water for washing or cleaning purposes, and this process works in one, or — maximum — a few daily cycles. In countries located at higher latitudes, where space heating is necessary in cold months, the current solar energy is insufficient to meet the space heating demand. The heat storage in deep layer of the ground is the one of possible way for solution of this problem. During the heating season, energy storage is discharged supplying the heat pomp cooperating with domestic heating system and during the summer months the storage can be charged by fluid heated in solar collectors. The main aim of presented research was analysis of using the ground layer as a heat storage system in the countries located in higher latitudes. The first variable taken into consideration was the output temperature of water leaving the solar collectors. The temperature distribution in the ground depends on the inlet water temperature, primary heated in the solar collectors, and forced into vertical boreholes. The temperature field in the ground was calculated using the duFort-Frankel finite-difference numerical method. A numerical code for 3D time dependent storage simulation has been created. The next step of analysis was calculation of waters’ temperature at the borehole output during cold months when the ground storage is discharged. This water works as a low-temperature reservoir of the heat pomp supplying the dwelling heating system. The solution of the problem is focused on an optimization of all parameters for the most efficient utilization of energy stored in the ground. The numerical genetic algorithms are scheduled to use to achieve this target.

scholarly journals Thermal Energy Storage System using Bamboo in Combination with PCM

2019 ◽  
Vol 8 (6S) ◽  
pp. 865-869
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Storage Capacity ◽  
Heat Storage ◽  
Storage System ◽  
National Level ◽  
Energy Storage System ◽  
Space Heating ◽  
Thermal Energy Storage System

The design of a Thermal energy storage system indicates the progress being made in this field. It reflects the level of implementation of new ideas by local societies as well as the Energy policy at the National level. We are using heat storage capacity of bamboo in combination with phase changing material for space heating , bamboo has some beneficial properties like its heat storage capacity increases with increasing temperature and its conductivity too is quite slow which is why it can easily preserve heat for longer durations( nearly up to 7 to 8 hours.) We look forward to utilize phase changing material along with bamboo for further increasing the heat storage capacity (large quantity of heat can be easily stored) of system so that we can easily achieve the sufficient temperature in order to meet human comfort conditions in all seasons(especially winter). Space heating represents the largest end use in buildings, offices etc, and consumes more than 7 trillion Joules of site ener gy annually. With this project we intend to put the waste heat to better use by diverting it to a better heating system which includes the use of the heat storage capacity of bamboo amplified with the use of Phase Changing Material. In this project we intend to test various PCM with bamboo to get a better option to be paired with it. The iterations being carried out on our self designed test rig are expected to give us reliable and accountable results.

scholarly journals Efficient Operation Method of Aquifer Thermal Energy Storage System Using Demand Response

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3129
Author(s):  
Jewon Oh ◽  
Daisuke Sumiyoshi ◽  
Masatoshi Nishioka ◽  
Hyunbae Kim
Keyword(s):  
Energy Storage ◽  
Power Consumption ◽  
Thermal Energy ◽  
Demand Response ◽  
Thermal Energy Storage ◽  
Heat Storage ◽  
Storage System ◽  
Total Power ◽  
Operation Method ◽  
Total Power Consumption

The mass introduction of renewable energy is essential to reduce carbon dioxide emissions. We examined an operation method that combines the surplus energy of photovoltaic power generation using demand response (DR), which recognizes the balance between power supply and demand, with an aquifer heat storage system. In the case that predicts the occurrence of DR and performs DR storage and heat dissipation operation, the result was an operation that can suppress daytime power consumption without increasing total power consumption. Case 1-2, which performs nighttime heat storage operation for about 6 h, has become an operation that suppresses daytime power consumption by more than 60%. Furthermore, the increase in total power consumption was suppressed by combining DR heat storage operation. The long night heat storage operation did not use up the heat storage amount. Therefore, it is recommended to the heat storage operation at night as much as possible before DR occurs. In the target area of this study, the underground temperature was 19.1 °C, the room temperature during cooling was about 25 °C and groundwater could be used as the heat source. The aquifer thermal energy storage (ATES) system in this study uses three wells, and consists of a well that pumps groundwater, a heat storage well that stores heat and a well that used heat and then returns it. Care must be taken using such an operation method depending on the layer configuration.

Use of alternative energy sources in protected agriculture

1982 ◽  
Vol 11 (1) ◽  
pp. 16-20 ◽  
Author(s):  
D. Pasternak ◽  
E. Rappeport
Keyword(s):  
Alternative Energy ◽  
Heat Storage ◽  
Waste Heat ◽  
Space Heating ◽  
Energy Sources ◽  
Soil Warming ◽  
Greenhouse Soil ◽  
Geothermal Waters ◽  
Water Curtain ◽  
Alternative Energy Sources

Low temperature energy sources for protected cropping include geothermal waters, waste heat from Industry, and trapped sunshine; application depends on the recovery of heat from circulating warmed water, either via the soil in which the plants are growing or via the air in the greenhouse. Soil warming pipes and ‘water-curtain’ systems of space-heating have shown promise, but heat storage, either for short periods or longer, remains a problem common to all such schemes.

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