Cooling energy savings with dry cooler equipped plants in office buildings

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

doi:10.18280/ijht.34s203

Cited by 4 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 1 more Smart Citation

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

et al. 2020

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

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Previous studies [8], carried out by the same authors, have evaluated the possible energy savings achievable by means of dry coolers adoption in heating and cooling plants serving office buildings.…”

Section: Introductionmentioning

confidence: 99%

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

Angelis¹,

Ceccotti²,

Saro³

2017

IJHT

View full text Add to dashboard Cite

In the present paper the possible energy savings achievable by means of dry coolers adoption in cooling plants serving shopping mall buildings has been carried out. In these buildings, could happens that, due to internal gains caused by occupancy, lighting, and electrical devices, or because of solar radiation entering through the large skylights on the aisle, some zones have to be cooled also during the middle and the winter seasons. The aim of this work is the evaluation of the energy saving, reachable when a water indirect free cooling system is integrated into a traditional cooling equipment in a shopping mall. Depending on outside climate conditions, the dry-cooler units could be used alternatively to cool down the refrigerant flow, or the water supplied to fan coils, achieving in such a way an indirect free cooling; so, the proposed system allows to turn off the chiller. By means of energy simulations, electrical energy saving in different locations has been evaluated. Simulations results allowed a comparison between a traditional plant and a plant equipped with a dry-cooler. These simulations were useful to evaluate the influence of weather conditions in the dry cooler integration convenience.

show abstract

“…Previous studies [21], carried out by the same authors, have evaluated the possible energy savings achievable by means of dry coolers adoption in heating and cooling plants serving office buildings.…”

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

View full text Add to dashboard Cite

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.

show abstract

Cooling energy savings with dry cooler equipped plants in office buildings

Cited by 4 publications

References 3 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

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

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

Contact Info

Product

Resources

About