scholarly journals Design and Modelling of a Cooling Unit by Adsorption Geothermal Heat Pump in a Tropical Climate Zones

2021 ◽  
pp. 39-54
Author(s):  
Djanfar El-Maktoume ◽  
Xavier Chesneau ◽  
Abdoulaye . ◽  
Diallo . ◽  
Sinon Souleymane ◽  
...  
Keyword(s):  
Fluid Velocity ◽  
Tropical Climate ◽  
Thermodynamic System ◽  
Coefficient Of Performance ◽  
Climatic Data ◽  
Air Conditioner ◽  
Geothermal Heat ◽  
Cooling Unit ◽  
Geothermal Heat Pump ◽  
Adsorbed Mass

This work is a contribution of a modelling of air conditioner by adsorption for a habitat in a tropical climate. The system mainly consists of a captor adsorber powered by a geothermal pump, a condenser and an evaporator. We use the zeolite/methanol couple and the different thresholds temperatures to define the thermodynamic system cycle. Moreover, we use a methodology based on nodal approach to establish heat and mass transfer equations. Dubinin-Astakhov thermodynamic model is employed to express the mass adsorbed, the coefficient of performance (COP) and the cold production. We make use of the climatic data in Comoros for 2009-2019 period to obtain the ambient temperature. The model validation is done by comparing the shape of the cycle we obtain with the state of the art. First, the results show a relationship between temperature, pressure and adsorbed mass. The increase in temperature is accompanied by an increase of pressure and an increase of adsorbed mass, and in the same way a decrease in the temperature causes a decrease of the pressure as well as a decrease of adsorbed mass. The mixture zeolite/methanol reaches 356K at the regeneration temperature with an input water temperature of 363K. We observed the influence of main important parameters on the mixture temperature such as fluid input temperature, fluid velocity or zeolite thermal conductivity. Finally, we show the thresholds temperatures influence on the COP and the cold production at evaporator.

scholarly journals A Pilot Study on Geothermal Heat Pump (GHP) Use for Cooling Operations, and on GHP Site Selection in Tropical Regions Based on a Case Study in Thailand

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2356 ◽  
Author(s):  
Sasimook Chokchai ◽  
Srilert Chotpantarat ◽  
Isao Takashima ◽  
Youhei Uchida ◽  
Arif Widiatmojo ◽  
...  
Keyword(s):  
Heat Pump ◽  
Air Temperature ◽  
Electricity Consumption ◽  
Underground Water ◽  
Air Conditioner ◽  
Well Performance ◽  
Geothermal Heat ◽  
Tropical Regions ◽  
Groundwater Aquifer ◽  
Geothermal Heat Pump

In order to reduce electricity consumption, the vertical loop geothermal heat pump (GHP) system coupled with a normal air conditioner was installed in an experimental room in the Parot Racha Building, Chulalongkorn University, Bangkok, Thailand for a comparative, long-term measurement program. The decrease in electricity consumption was approximately 30%. On the basis of the data derived from our measurements, the underground temperature seemed to be consistent and lower than the average outside air temperature, over two years. The underground system consisted mainly of two 50-m-long drilling wells and pipes with a total length of 170 m. The well performance was not examined, but both soil and groundwater aquifer (Bangkok aquifer) at 25 to 50 m. could be utilized for the cooling operation. Moreover, the major controlling factors of electricity consumption were found to be the outside air temperatures and the underground water circulation temperatures. In addition, we considered the geology, underground temperature, and aquifer of Bangkok concluding that almost all Bangkok areas are suitable for GHP installation, except for those where the subsurface temperature is too high compared with the outside air temperature.

scholarly journals A Study on the Efficiency Improvement of Multi-Geothermal Heat Pump Systems in Korea Using Coefficient of Performance

Energies ◽  
2016 ◽  
Vol 9 (5) ◽  
pp. 356 ◽  
Author(s):  
Young-Ju Jung ◽  
Hyo-Jun Kim ◽  
Bo-Eun Choi ◽  
Jae-Hun Jo ◽  
Young-Hum Cho
Keyword(s):  
Heat Pump ◽  
Coefficient Of Performance ◽  
Efficiency Improvement ◽  
Geothermal Heat ◽  
Geothermal Heat Pump

scholarly journals Influence of boundary conditions on the optimization of a geothermal heat pump studied using a thermodynamic model

2022 ◽  
Vol 960 (1) ◽  
pp. 012003
Author(s):  
A Arz ◽  
A Minghini ◽  
M Feidt ◽  
M Costea ◽  
C Moyne
Keyword(s):  
Boundary Conditions ◽  
Heat Pump ◽  
Thermal Contact ◽  
Dirichlet Condition ◽  
Thermal Capacity ◽  
Coefficient Of Performance ◽  
Neumann Condition ◽  
Carnot Cycle ◽  
Geothermal Heat ◽  
Geothermal Heat Pump

Abstract This paper is the logical follow-up to a work [1] whose results were presented at the 28th French Thermal Congress which was to be held in Belfort in 2020. The model developed at that time is completed in this proposal to consider the specificity of the geothermal heat pump. This is a machine operating upon a mechanical vapor compression cycle, the limit of which is an inverse Carnot cycle. Its specificity consists of a cold loop at the source with the geothermal exchanger and the evaporator, then a hot loop at the sink with the condenser and a floor heat exchanger in the application considered here. We are particularly concerned with the optimal sizing of these heat exchangers through their effectiveness. The parametric sensitivity of this distribution to various boundary conditions is studied, especially by focusing on different conditions at the source: (1) imposed soil temperature, corresponding to a Dirichlet condition, (2) imposed heat flux (including adiabatic case), corresponding to a Neumann condition, (3) imposed mechanical power consumed by the heat pump, and (4) imposed coefficient of performance COP, to all cases being associated a finite thermal capacity in thermal contact with the geothermal exchanger operating in steady-state conditions.

scholarly journals Study of Habitat’s Thermal Performance Equipped with an Adsorption Cooling Unit by Geothermal Heat Pump

2021 ◽  
Vol 09 (08) ◽  
pp. 26-52
Author(s):  
Djanfar El-Maktoume ◽  
Xavier Chesneau ◽  
Abdoulaye Diallo ◽  
Zely Arivelo Randriamanantany
Keyword(s):  
Heat Pump ◽  
Thermal Performance ◽  
Geothermal Heat ◽  
Cooling Unit ◽  
Geothermal Heat Pump

Study on Water-Cooled Solar Semiconductor Air Conditioner

2015 ◽  
Vol 9 (1) ◽  
pp. 135-140
Author(s):  
Dong Zhi-Ming ◽  
Guo Li-Xia ◽  
Chang Ji-Bin ◽  
Zhou Xue-Bin
Keyword(s):  
Air Conditioning ◽  
Working Condition ◽  
Test System ◽  
Air Conditioner ◽  
Solar Panels ◽  
Experimental Room ◽  
Maximum Value ◽  
Cooling Unit ◽  
Battery Capacity ◽  
Solar Powered

Aiming to compare the cooling effect, two types of solar-powered semiconductor air-conditioning devices were designed in different structures. According to the cooling load in an experimental room, the solar panels and battery capacity were determined for the development of a test system. In the same working condition, a comparison test was carried out to examine the cooling performance. Experimental results showed that the design of dual water-cooled cooling unit presented a higher ratio of energy efficiency, with its maximum value of 1.08. By observing the experimental data of the prototype, its comparative economic evaluation results indicated that the annualized cost of solar semiconductor airconditioning was app. 2.7 times that of air-conditioning made from an ordinary compressor.

scholarly journals Experimental Study on the Water Selective Dense Membrane under an Absolute Pressure Difference with Simplified Test Method

2021 ◽  
Vol 11 (4) ◽  
pp. 1710
Author(s):  
Jinwook Lee ◽  
Hyo-Sun Kim ◽  
Donik Ku ◽  
Jihun Lim ◽  
Minkyu Jung ◽  
...  
Keyword(s):  
Measurement Methods ◽  
Test Method ◽  
Coefficient Of Performance ◽  
Absolute Pressure ◽  
Air Conditioner ◽  
Experimental Conditions ◽  
Simple Method ◽  
Performance Factors ◽  
Dense Membrane ◽  
Before And After

Membrane-based vacuum dehumidification technology is currently being actively studied. In most studies, the performance of the membrane-based systems is evaluated under the assumption that the membrane can achieve ideal separation, which results in ideal coefficient of performance (COP) values. However, the performance factors for membranes vary depending on the experimental conditions and measurement methods. Therefore, relevant values can only be calculated if the data are measured in an environment close to that of the application conditions. The cup measurement method is a simple method to measure the permeability, however, there are limitations regarding adding variables during the experiment. To overcome these limitations, a new experimental device was constructed that combines pressurized cell with the cup method. Using the device, the performance of polyethylene-amide-bonded dense membranes was evaluated under conditions where absolute pressure differentials occurred before and after the membrane, such as in air conditioner dehumidification systems.

Evaluation of heat exchange rate of GHE in geothermal heat pump systems

2009 ◽  
Vol 34 (12) ◽  
pp. 2898-2904 ◽  
Author(s):  
Liu Jun ◽  
Zhang Xu ◽  
Gao Jun ◽  
Yang Jie
Keyword(s):  
Exchange Rate ◽  
Heat Exchange ◽  
Heat Pump ◽  
Geothermal Heat ◽  
Geothermal Heat Pump
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