Evaluation of Evaporative Cooling Systems in Industrial Buildings

Angelis, Alessandra De; Medici, Marco; Saro, Onorio; Lorenzini, Giulio

doi:10.18280/ijht.330301

“…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.…”

mentioning

confidence: 99%

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

Libralato

¹

,

Murano

²

,

Angelis

³

et al. 2020

Self Cite

View full text Add to dashboard Cite

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 ...

show abstract

“…In order to evaluate energy saving achievable using the cool external air to reduce heat loads other studies were developed. Cannistraro et al [5] found that in a CED (center of processing data) energy saving for air conditioning is equal to 50%, 36% and 21% in Milan, Rome and Catania respectively.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of an indirect free-cooling system has been investigated by authors [6] in a previous study. The case analyzed was made up of air ventilation systems to obtain comfort condition inside an industrial building by means of water evaporation process.…”

Section: Introductionmentioning

confidence: 99%

Cooling energy savings with dry cooler equipped plants in office buildings

Angelis¹,

Ceccotti²,

Saro³

2016

IJHT

View full text Add to dashboard Cite

The cooling energy requirements are a key issue for office buildings in warm climates, but they have become considerable also in temperate climates, 'cause the growing level of buildings thermal insulation. This aspect is more critical in office blocks than in residential buildings, due to the higher value of thermal energy supplied by internal loads. Office buildings are usually equipped with cooling systems in order to guarantee thermal comfort conditions for the office workers. The aim of this work is the evaluation of energy saving reachable in office blocks cooling requirements, using a water indirect free cooling operating procedure for the plant. It is assumed that the HVAC plant is equipped with dry-coolers that work as coolers of the refrigeration equipment condensers or just as coolers of the water to be supplied to fan coils. As the more solar radiation there is, the more cooling power is needed, dry-coolers, equipped with on-board photovoltaic panels, have been considered. The cooling loads of the office block have been evaluated through Energy Plus hourly time-step simulations for different climate conditions. Finally, electrical consumption of dry-c and energy produced by PV panels in different climates and with different tilts have been evaluated and compared.

show abstract

“…Cannistraro et al [5] found that in a CED (center of processing data) energy saving for air conditioning is equal to 50%, 36% and 21% in Milan, Rome and Catania respectively.…”

Section: Introductionmentioning

confidence: 99%

Cooling energy savings with dry cooler equipped plants in office buildings

Angelis¹,

Ceccotti²,

Saro³

2016

IJHT

View full text Add to dashboard Cite

The cooling energy requirements are a key issue for office buildings in warm climates, but they have become considerable also in temperate climates, 'cause the growing level of buildings thermal insulation. This aspect is more critical in office blocks than in residential buildings, due to the higher value of thermal energy supplied by internal loads. Office buildings are usually equipped with cooling systems in order to guarantee thermal comfort conditions for the office workers. The aim of this work is the evaluation of energy saving reachable in office blocks cooling requirements, using a water indirect free cooling operating procedure for the plant. It is assumed that the HVAC plant is equipped with dry-coolers that work as coolers of the refrigeration equipment condensers or just as coolers of the water to be supplied to fan coils. As the more solar radiation there is, the more cooling power is needed, dry-coolers, equipped with on-board photovoltaic panels, have been considered. The cooling loads of the office block have been evaluated through Energy Plus hourly time-step simulations for different climate conditions. Finally, electrical consumption of dry-c and energy produced by PV panels in different climates and with different tilts have been evaluated and compared.

show abstract

Evaluation of Evaporative Cooling Systems in Industrial Buildings

Cited by 7 publications

References 15 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

Cooling energy savings with dry cooler equipped plants in office buildings

Cooling energy savings with dry cooler equipped plants in office buildings

Contact Info

Product

Resources

About