The Experimental Study of Water Storage Performance on Small Heat-Pump Energy Storage Air-Conditioner

2012 ◽  
Vol 608-609 ◽  
pp. 1133-1136
Author(s):  
Fang Wang ◽  
Jing Yi Wang ◽  
Meng Liu ◽  
Zhen Ya Zhang
Keyword(s):  
Energy Storage ◽  
Heat Pump ◽  
Heat Storage ◽  
Storage System ◽  
Pump Energy ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Air Conditioner ◽  
Air Conditioning System ◽  
Heating Capacity

Based on the performance of energy storage air conditioning system, a small heat pump water heat storage air conditioner was designed with some experiments in winter running. The experiments show that the heat storage system can improve inlet temperature of the refrigerating compressor effectively when proceeding heating mode, and the outlet temperature is also higher relatively; In the low-temperature heating condition, the maximum heating capacity can up to more than the rated heating capacity and the defrosting performance is better too; But the heat storage capacity of the system is quite limited for the thermal storage material is water.

Investigation on Simultaneous Charging and Discharging Process of Water Thermocline Storage Tank Employed in Combined Heat and Power Units

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
ELSaeed Saad ELSihy ◽  
Xiaohui Wang ◽  
Chao Xu ◽  
Xiaoze Du
Keyword(s):  
Storage Tank ◽  
Heat Storage ◽  
Numerical Study ◽  
Storage System ◽  
Combined Heat And Power ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Operation Performance ◽  
Discharge Performance ◽  
Model Studies

Abstract Thermal energy storage (TES) has become a key component in combined heat and power (CHP) generation, which enhances the load regulation capability and overall thermal performance. In line with that concept, the present work addresses a numerical study that aims at investigating and predicting the transient thermal behavior of a water thermocline storage tank that integrates into a CHP plant. Investigations are carried out on two distinct two-dimensional models. The first model studies thermocline characteristics of the heat storage system through a single-charge/discharge operation. The influences of various operating parameters such as the inlet flowrate and the inlet temperature of HTF are investigated. Results indicate that the thermocline thickness increases as the inlet flowrate increases, and consequently, the heat storage/release period decreases. The second modified model discusses the technique of simultaneous charging and discharging operation applied in the CHP unit. Two types of operations are analyzing with (a) stable charging with steady discharging and (b) periodic charging with steady discharging. The results ravel out that the mixing ratio of charging and discharging flowrate (Qc/Qd) has a strong influence on the operation performance. When the ratio of Qc/Qd >1, the thermocline forms, and its thickness increases with time. The thermocline thickness remains constant as this ratio declines to 0.625. In the case of periodic charging, both larger charging flowrate and shorter non-charging periods result in maintaining the discharge outlet temperature of HTF stable for the heat-supply net, and discharge performance improved.

Analysis of Combined Ground-Source Heat Pump and Water Energy Storage System and its Economic Impact Factors

2014 ◽  
Vol 953-954 ◽  
pp. 771-774
Author(s):  
Xiao Ting Wu ◽  
Ling Xia Kong ◽  
Chun Mei Guo ◽  
Bin Hu
Keyword(s):  
Energy Storage ◽  
Heat Pump ◽  
Storage System ◽  
Energy Storage System ◽  
Economic Benefits ◽  
Impact Factors ◽  
Ground Source Heat Pump ◽  
Local Policy ◽  
Air Conditioning System ◽  
Ground Source

This paper makes an introduction of the working principle and the technical and economic benefits of the combined ground-source heat pump and water energy storage system. And then according to the characteristic of this system itself and its mode of operation, we can point out that the energy storage rate, the local policy of electricity price and the strategy of operation are the main factors which influent the economic characteristics of the system. Using the initial investment and the operation cost of the system as the economy evaluation index, we respectively analyze the influence of the above factors on the index. And wish the results of the analysis can provide reference on the design of this new type air-conditioning system.

Heat Storage Performance of Heating System of Phase Change Heat Storage

2012 ◽  
Vol 214 ◽  
pp. 82-86
Author(s):  
Yong Sun ◽  
Feng Xu ◽  
Yong Jiang Shi ◽  
Xiao Yang Ji ◽  
Tian Liang Liu
Keyword(s):  
Phase Change ◽  
Heat Storage ◽  
Storage System ◽  
Heating System ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Storage Performance ◽  
Internal Fluid ◽  
Heat Storage Material ◽  
Change Material

An experimental table of the heating system of phase change heat storage is built with thermal-storage tank packaging phase change material, which transferred heat with internal fluid. The flow rate, inlet temperature, outlet temperature of internal fluid and the temperature of heat storage material are measured. The influences on the properties of heat storage system are analyzed.

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.

scholarly journals Heat pump air conditioning system for pure electric vehicle at ultra-low temperature

2014 ◽  
Vol 18 (5) ◽  
pp. 1667-1672 ◽  
Author(s):  
Hai-Jun Li ◽  
Guang-Hui Zhou ◽  
An-Gui Li ◽  
Xu-Ge Li ◽  
Ya-Nan Li ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electric Vehicle ◽  
Heat Pump ◽  
Air Conditioning ◽  
Heating System ◽  
Experimental Results ◽  
Air Conditioning System ◽  
Discharge Temperature ◽  
Heating Capacity ◽  
Environment Temperature

When the ordinary heat pump air conditioning system of a pure electric vehicle runs at ultra-low temperature, the discharge temperature of compressor will be too high and the heating capacity of the system will decay seriously, it will lead to inactivity of the heating system. In order to solve this problem, a modification is put forward, and an experiment is also designed. The experimental results show that in the same conditions, this new heating system increases more than 20% of the heating capacity; when the outside environment temperature is negative 20 degrees, the discharge temperature of compressor is below 60 degrees.

A novel liquid air energy storage system using a combination of sensible and latent heat storage

2021 ◽  
pp. 117890
Author(s):  
Ju-Yeol Ryu ◽  
Adrian Alford ◽  
Graham Lewis ◽  
Yulong Ding ◽  
Yunren Li ◽  
...  
Keyword(s):  
Energy Storage ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Latent Heat Storage
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