A simplified method to evaluate the seasonal energy performance of water chillers

Cecchinato, Luca; Chiarello, Manuel; Corradi, Marco

doi:10.1016/j.ijthermalsci.2010.04.010

Cited by 19 publications

(5 citation statements)

References 6 publications

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“…Following the outcomes of the preceding paragraph, this analysis was carried out by considering 3 ejectors for the Milan climate (φ ej = +20%), and 4 ejectors for the cases of Madrid and Athens (φ ej = +80%). Typical seasonal performance of electrical chillers is reported in [21]; in particular, a SEER el of 4.0 could be obtained when considering Milan as the climatic zone. An air-cooled absorption system was considered, and the SEER was evaluated by treating electrical load as energy input.…”

Section: Thermo-economic Comparison With the Current Technologymentioning

confidence: 99%

Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation

et al. 2021

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In this paper, a seasonal performance analysis of a hybrid ejector cooling system is carried-out, by considering a multi-ejector pack as expansion device. A 20 kW ejector-based chiller was sized to obtain the optimal tradeoff between performance and investment costs. The seasonal performance of the proposed solution was then evaluated through a dynamic simulation able to obtain the performance of the designed chiller with variable ambient temperatures for three different reference climates. The optimized multi-ejector system required three or four ejectors for any reference climate and was able to enhance the system performance at partial load, with a significant increase (up to 107%) of the seasonal energy efficiency ratio. The proposed system was then compared to conventional cooling technologies supplied by electric energy (electrical chillers EHP) or low-grade heat sources (absorption chillers AHP) by considering the total costs for a lifetime of 20 years and electric energy-specific costs for domestic applications from 0.10 to 0.50 €/kWhel. The optimized multi-ejector cooling system presented a significant convenience with respect to both conventional technologies. For warmer climates and with high electricity costs, the minimum lifetime for the multi-ejector system to achieve the economic break-even point could be as low as 1.9 years.

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Section: Thermo-economic Comparison With the Current Technologymentioning

confidence: 99%

Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation

et al. 2021

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“…The profiles of the COP of the two heat pumps considered, one for DHW production and the other for the HVAC system, are shown in Figure 9 as a function of the outdoor temperature. As regards the AC capacity, the EER of the chiller unit is given by the following expression derived from data (Cecchinato et al, 2010 The Space Heating and AC demand yearly profiles used in this analysis, obtained from the transient simulation of the thermal behaviour of the building (Dipasquale et al, 2016), are shown in figure 8 together with the profile for DHW, which is based on average experimental data. The electrical energy utilization of the CRU and of the Heat Pumps (HPs) for a whole year, in the analysed cases, is reported in Table 4.…”

Section: Performance Of the Integrated Systemmentioning

confidence: 99%

Field tests, model validation and performance of a CO2 commercial refrigeration plant integrated with HVAC system

D’Agaro

Coppola

Cortella

2019

International Journal of Refrigeration

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A fully instrumented CO2 trans-critical booster system with parallel compression, in operation in a small size supermarket in northern Italy, made available measured data that allowed monitoring its performance. The entire refrigeration system of the supermarket, i.e. the Commercial Refrigerating Unit, the refrigerated display cabinets and cold rooms, have been modelled in TRNSYS with in-house types for all components. The comparison with the field data available from monitoring the plant allowed to thoroughly calibrate the model, spanning the operation conditions of a whole year. The validated model is a reliable and powerful tool, usable to predict the plant performance in several conditions and to evaluate the feasibility and effectiveness of the integration with DHW/HVAC systems. Measurements and simulations show that, at mild climate conditions, it is possible and effective to fully provide HVAC and refrigeration duties with a single all-in-one unit properly designed and operated.

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“…An external iteration loop enables the set outlet water temperature to be obtained by varying its inlet temperature. The present simulation tool was validated on the experimental performance data available in Cecchinato et al (2010). That set of data was obtained from off-the-shelf chillers similar to the configuration analyzed in the present article.…”

Section: Complete Unit Simulation At Nominal Working Conditionsmentioning

confidence: 99%

Energy efficiency of a reversible refrigeration unit using R410A or R32

Zilio

Brignoli

Kaemmer

et al. 2015

Science and Technology for the Built Environment

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The aim of this article is twofold: first, to compare the performance of R410A with that of R32, which is considered a possible HFC substitute with lower global warming potential (675 instead of 2088); second, to exploit the effect of the circuit length in the finned coil of a packaged air-to-water reversible unit with given water plate heat exchanger and scroll compressor. Both scopes are pursued through the analysis of a case study, a system with nominal cooling capacity of about 74 kW at 35◦C dry-bulb outdoor air temperature and a nominal heating capacity of about 70 kW at 2◦C dry-bulb and 1◦C wet-bulb ambient temperature. The performance of the two refrigerants inside a “real” machine is simulated by means of an advanced numerical model of a packaged reversible refrigeration unit. The system consists of a single refrigerating circuit with two identical scroll compressors. The compressor was characterized by its experimental performance curve according to Standard EN 12900 (EN 2013a) for both R410A and R32. Off-the-shelf copper tubes and louvered aluminum fins were considered for the condenser and typical brazed-plate heat exchanger for the evaporator of the chiller configuration. The finned coil heat exchanger was first thermodynamically optimized for R410A and R32 for both condenser and evaporator operation with regard to the number of internal circuits according to the total temperature penalization performance evaluation criteria (Cavallini et al. 2010; Brown et al. 2013), without changing the overall heat exchanger dimensions. The effect of finned coil circuit length on the performance of the investigated reversible unit with the two refrigerants was then analyzed at nominal design conditions and under a seasonal perspective. Based on the modeling work, it is possible to conclude that R32 system efficiency performance is acceptable as alternative to R410A for packaged air-to-water reversible unit

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A simplified method to evaluate the seasonal energy performance of water chillers

Cited by 19 publications

References 6 publications

Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation

Waste Heat Driven Multi-Ejector Cooling Systems: Optimization of Design at Partial Load; Seasonal Performance and Cost Evaluation

Field tests, model validation and performance of a CO2 commercial refrigeration plant integrated with HVAC system

Energy efficiency of a reversible refrigeration unit using R410A or R32

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