Energy savings evaluation for dry-cooler equipped plants in shopping mall buildings

Angelis, Alessandra De; Ceccotti, L.; Saro, Onorio

doi:10.18280/ijht.35sp0149

Cited by 6 publications

(6 citation statements)

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“…The findings suggest that also other designing procedures of building systems could be influenced by these differences (considering also the extreme temperatures variations). Among the others, the systems whose efficiency depends on weather conditions should be studied, for example heat pumps [35][36][37], evaporative cooling systems [13,14] or dry coolers [15][16][17] systems, that are relevant for large scale planning, energy savings, water and carbon footprint reduction [38,39].…”

Section: Discussionmentioning

confidence: 99%

“…The Moisture Representative Year generation procedure presented in this work, is intended to produce representative years to be used in simulation tools that consider also the influence of rain, like the aforementioned ones. Moreover, the efficiency of some heating and cooling system components depends on the moisture content of air (for example the evaporative cooling systems [13,14], the dry cooler systems [15][16][17]) and thus, the results of the analysis would require a weather file selected also considering the weather variables related to moisture content of air. The heat and moisture transfer simulations of the walls are more frequently performed to evaluate the risks connected to the uncontrolled moisture migration.…”

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confidence: 99%

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Influence of the Meteorological Record Length on the Generation of Representative Weather Files

et al. 2020

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Heat and moisture (HM) transfer simulations of building envelopes and whole building energy simulations require adequate weather files. The common approach is to use weather data of reference years constructed from meteorological records. The weather record affects the capability of representing the real weather of the resulting reference years. In this paper the problem of the influence of the length of the records on the representativeness of the reference years is addressed and its effects are evaluated also for the applicative case of the moisture accumulation risk analysis with the Glaser Method and with DELPHIN 6, confirming that records shorter than 10 years could lead to less representative reference years. On the other hand, it is shown that reference years obtained from longer periods are not representative of the most recent years, which present higher dry-bulb air temperatures due to a short-term climate change effect observed in all the considered weather records. An alternative representative year (Moisture Representative Year) to be used in building energy simulations with a strong dependence on moisture is presented. This requirement could be very restrictive, for example, for the regions with only recently installed weather stations. The aim of this work is to investigate the influence of the MY length on the moisture accumulation risk assessment performed using reference years for four cities of the Northern Italy. In addition, a reference year, alternative to the TMY for the moisture related building simulations is presented. Heat and Moisture Transfer SimulationsThe simulation of the building envelope could be performed considering the coupled transfer of heat and moisture. The resulting simulation provides an accurate calculation of the heat losses, including in the calculations also the variability of the thermal material properties due to the variation of the moisture content and the temperature and the latent heat losses due to the moisture migration. These types of models have been introduced in the whole building energy simulations and their influence has been proven to be relevant in several situations. A review on the effects of an inappropriate estimation of moisture content in materials is presented in [2]. Several examples of calculation methods and tools used to perform these simulations, with different hypotheses, are presented in literature (a review of the simulation methods is presented in [3]). A comparison between the effects of using different models of heat and moisture transfer in EnergyPlus whole building simulations is presented in [4], where the models are used to compare the moisture buffering effect of the hygroscopic materials calculated with different models on the internal environmental conditions. In [5], the implementation of the heat and moisture transfer model that considers the moisture hysteresis of hygroscopic materials (described in [6] and implemented in the software MATCH) is implemented in a whole building simulation tool, BSim). Similarly, [7] presents ...

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Section: Discussionmentioning

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Influence of the Meteorological Record Length on the Generation of Representative Weather Files

et al. 2020

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“…These efforts will create a favourable policy environment and standard market order for the promotion of green credit, and boost the on-going enhancement of technological innovation efficiency. In the meantime, commercial banks should improve their own management level and make use of the market forces to increase their operation efficiency [20][21][22]…”

Section: B Situation Evolution Simulationmentioning

confidence: 99%

A System Dynamics Simulation Study on the Efficiency of Commercial Banks from the Perspective of Green Credit

2020

International Journal of Economics and Statistics

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With the deepened commitment to the green credit policy and increasingly intense competition among commercial banks, the impact of green credit on the efficiency of commercial banks has attracted great attention from the banking industry and governments. To study the efficiency of commercial banks from the perspective of green credit, this paper, with a case study on Bank of Shanghai, builds a system dynamics model to present the causal loop diagram and system flow diagram and seek the functional relations between variables. Then it goes on to simulate the evolution of the policy situation with system dynamics and attempts to find out the change path and evolution direction of green credit and variables regarding bank efficiency when a certain policy is adjusted, with a view to providing theoretical basis and data support for formulation of financial policies and selection of bank strategies.

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“…Simulations of the first configuration are carried out by the authors in a previous work [9]. The investigated cooling system has been compared, in terms of energy consumption and overall coefficient of performance, with a configuration most widely used for commercial building, in which the water-cooled condensers of the chiller uses recirculation water from a cooling tower.…”

Section: Cooling Plant Systemsmentioning

confidence: 99%

“…In a previous study [9] authors evaluated the feasibility and the advantages to substitute cooling towers for dry-coolers. For different locations, TRNSYS simulations were carried out and the results shown that, in cities with a colder climate, there is a greater energy saving due to a lower value of the external mean air temperature; in particular, the city with the greatest annual energy saving amount (42.4%) is Hamburg, whereas the city with the lowest annual energy saving amount (14.2%) is Messina.…”

Section: Introductionmentioning

confidence: 99%

Free-cooling potential in shopping mall buildings with plants equipped by dry-coolers boosted with evaporative pads

Angelis¹,

Chinese²,

Saro³

2017

IJHT

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Shopping malls are often characterized by high internal thermal loads due to occupancy, lighting, electrical devices, and solar radiation entering through the large skylights. The aim of this study is the evaluation of the energy saving reachable adding a cooling evaporative pad upstream a dry cooler. In particular, two different cooling plant configurations has been investigated: a cooling plant with a chiller equipped with a dry cooler (C-DC), that can be used as condenser of refrigeration system or to work with free-cooling mode and the previous system equipped with an evaporative cooling pad upstream the dry cooler (C-E-DC) in order to enlarge the range of temperatures suitable for free cooling. A building model of a typical shopping mall and two cooling plant has been modeled by means of TRNSYS simulations carried out in several European cities. Simulation results show that the C-E-DC configuration allows a greater energy saving amount than C-DC configuration for all the cities considered. It can be noted that the locations with a hot or moderate climate have a higher reduction in chiller electrical consumptions. Further investigations will be carried out taking in to account more extensively the moisture content of the air for the different locations considered.

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Energy savings evaluation for dry-cooler equipped plants in shopping mall buildings

Cited by 6 publications

References 7 publications

Influence of the Meteorological Record Length on the Generation of Representative Weather Files

Influence of the Meteorological Record Length on the Generation of Representative Weather Files

A System Dynamics Simulation Study on the Efficiency of Commercial Banks from the Perspective of Green Credit

Free-cooling potential in shopping mall buildings with plants equipped by dry-coolers boosted with evaporative pads

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