Thermal-comfort analysis and simulation for various low-energy cooling-technologies applied to an office building in a subtropical climate

Chowdhury, Ashfaque Ahmed; Rasul, M. G.; Khan, M.M.K.

doi:10.1016/j.apenergy.2007.10.001

Cited by 121 publications

(41 citation statements)

References 7 publications

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“…This component is called internal heat exchanger and its capacity can be calculated with specifying the exit temperature of the refrigerant from this device (the exit temperature of the gas cooler and the mass flow rate of the refrigerant have been already calculated). When the exit temperature of the internal heat exchanger is assumed to be equal the ambient air temperature, the COP value of the R744 VAC system reaches its maximum value (35°C in this study) [18].…”

Section: Calculation Of Main Componentsmentioning

confidence: 96%

“…The similar approach can be applied for specifying the evaporation temperature. The most comfortable temperature and relative humidity values are determined as 23°C and 55%, respectively [18]. Thus, the evaporation temperature can be calculated as 23°C -∆T (15°C) = 8°C.…”

Section: ) Specifying Operating Conditionsmentioning

confidence: 99%

“…From the figure, the evaporation pressure that corresponds to an evaporation temperature can be found 42.298 bars by interpolation. Also, the optimum high pressure is 108 bars when the outside ambient temperature is 35 °C, the compressor efficiency is 0.75 and the evaporation temperature is 7 °C [18]. As a result, the operating conditions are specified.…”

Section: ) Specifying Operating Conditionsmentioning

confidence: 99%

See 2 more Smart Citations

Environmental Impact and Performance Comparison of Refrigerants (R744 and R134a) in a Mobile Air Conditioning System Used for Cooling Buses

Ozcana¹,

Gunerhanb²,

Hepbaslia³

et al. 2015

IJET

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Abstract-Environmental awareness and energy efficiency are important concepts in terms of sustainability. Regarding the negative impact on the ozone layer, the largest portion is due to the refrigerants used with a share of 31% caused by mobile air conditioning (MAC) systems. In this study, refrigerants used in MAC systems were discussed in the terms of environmental aspects. First, the cooling capacity of the bus was calculated by using ASHRAE Handbook and EN 14750 -1 standard for the city of Istanbul in Turkey. Next, a conventional MAC system (with R134a) used for a bus was considered and the performance tests of this system were performed at SAFKAR Inc., located in the city of Izmir, Turkey while the calculations for R744 were made using experimental values of R134a at the same capacity. Finally, various aspects were presented.

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Section: Calculation Of Main Componentsmentioning

confidence: 96%

Section: ) Specifying Operating Conditionsmentioning

confidence: 99%

Section: ) Specifying Operating Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Environmental Impact and Performance Comparison of Refrigerants (R744 and R134a) in a Mobile Air Conditioning System Used for Cooling Buses

Ozcana¹,

Gunerhanb²,

Hepbaslia³

et al. 2015

IJET

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“…They also found potential in using Earth Pipe for providing low energy cooling. Chowdhury et al [36] explained that a radiant system is a better alternative than pre-cooling or economizer usages to conventional cooling in a subtropical climate. They also found that pre-cooling or economizer did satisfy the current thermal-comfort standards.…”

Section: Literature Reviewmentioning

confidence: 99%

Passive energy management through increased thermal capacitance

Carpenter

Mago

Luck

et al. 2014

Energy and Buildings

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Energy usage within the world is increasing at a drastic rate. Buildings currently consume a major amount of the total energy used within the United States, and most of this energy usage supports heating and cooling. This demand shows that new passive energy management systems are needed. The use of Increased Thermal Capacitance (ITC) is proposed as a new passive energy management system. To increase thermal capacitance, a piping system is either added into a building's walls or ceiling. In this paper, a building with ITC added is compared to a similar building without ITC using the simulation program TRNSYS. Along with a comparison between the walls and ceiling, several parameters are analyzed for their effect on the performance of the ITC. ITC was found to be effective especially when located in the ceiling, with the location, specific heat and tank size being the most important factors. iii ACKNOWLEDGEMENTS

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“…According to regulations on energy consumption in buildings, it is possible to improve the thermal performance of buildings. It is possible to reduce the energy used in houses by 25-45% with only a few design measures taken [2]. Most of the energy used is consumed for heating and cooling buildings.…”

Section: Introductionmentioning

confidence: 99%

An Estimate of Energy Consumption for Housing Buildings in Hot Climatic Zones Through Artifical Intelligence Methods: Case of Antalya

Haydaraslan¹,

Haydaraslan²,

Kahraman³

et al. 2018

NWSA

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Buildings use about one-third of total energy consumed in order to meet their heating and cooling needs. The building envelope that enables to protect it from physical factors in the outer environment is quite effective upon the amount of energy consumed. For the energy efficient solutions, it is necessary to enhance the heating and cooling performance of the building envelope. With this aim, in the study, the energy loads were calculated, which were consumed for heating and cooling by a building established as a reference through a simulation program in the province of Antalya, which respects a hot climatic zone, and the shifts in yearly heating and cooling loads of the alternative models were examined, which were developed by changing the thermal insulation thickness and the window-to-wall area ratio. In the study, the modern, effective artificial intelligence methods were used to enhance the energy performance of multi-dimensional buildings. Of the models for which heating and cooling load calculation had not been made before, the estimates for the thermal loads were made using an energy simulation program, and it has been reached that thermal insulation thickness and window-to-wall area ratio have effect on both loads.

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Thermal-comfort analysis and simulation for various low-energy cooling-technologies applied to an office building in a subtropical climate

Cited by 121 publications

References 7 publications

Environmental Impact and Performance Comparison of Refrigerants (R744 and R134a) in a Mobile Air Conditioning System Used for Cooling Buses

Environmental Impact and Performance Comparison of Refrigerants (R744 and R134a) in a Mobile Air Conditioning System Used for Cooling Buses

Passive energy management through increased thermal capacitance

An Estimate of Energy Consumption for Housing Buildings in Hot Climatic Zones Through Artifical Intelligence Methods: Case of Antalya

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