Solar-powered absorption chillers: A comprehensive and critical review

Shirazi, Ali; Morrison, Graham; White, Stephen D.

doi:10.1016/j.enconman.2018.05.091

Cited by 189 publications

(108 citation statements)

References 172 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…The coefficient of performance of the heat pumps COPhp is defined as the ratio of cooling/heating energy yield and electrical consumption. It is determined on the basis of the Equations (3) and (4): 4 , 17 16 3 ,…”

Section: Heat Pumpsmentioning

confidence: 99%

“…where Q t , Q c , and Q h are the total cooling or heating energy used, cooling energy generated by the chiller driven by solar and heating energy generated by solar, respectively; F 2 , F 3 , and F 4 are the hot water inlet flow rate of the absorption chiller, chilled water inlet flow rate of the absorption chiller and inlet flow rate of the fan coils, respectively; c p,w is the specific heat of water; T 4 and T 5 are the upper layer temperature and lower layer temperature of the hot water storage tank, respectively; T 10 and T 11 are the chilled water outlet and inlet temperatures of the absorption chiller, respectively; T 16 and T 17 are the inlet temperature and outlet temperature of the fan coils, respectively; E 1 is the electrical consumption of the heat pumps; COP hp,c and COP hp,h are the coefficient of performance of the heat pumps during the summer cooling time and that during the winter heating time, respectively, with an uncertainty of 3.5% due to the measurement errors; SF n,c and SF n,h are the solar fraction for building cooling and heating, respectively, with an uncertainty of 3.2% due to the measurement errors. Figure 15 shows the monthly cooling/heating energy supplied, the electricity consumption, and the coefficient of performance of the heat pumps COP hp in 2018.…”

Section: Heat Pumpsmentioning

confidence: 99%

“…When the ambient temperature was about 30.3 • C during the experimental Energies 2019, 12, 996 3 of 17 period, the average solar collecting efficiency and the COP of the chiller was 0.42 and 0.75, respectively, whereas the average indoor air temperature was 23.8 • C [15].Due to the intermittent nature of solar energy, a backup system is required in solar cooling and heating systems to meet the building load demand when solar inputs are insufficient. The backup system can use either gas or electricity as the auxiliary energy source [16]. Most of the above-mentioned solar cooling and heating systems used a gas boiler as an auxiliary heat source.…”

mentioning

confidence: 99%

“…Due to the intermittent nature of solar energy, a backup system is required in solar cooling and heating systems to meet the building load demand when solar inputs are insufficient. The backup system can use either gas or electricity as the auxiliary energy source [16]. Most of the above-mentioned solar cooling and heating systems used a gas boiler as an auxiliary heat source.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Installation and Operation of a Solar Cooling and Heating System Incorporated with Air-Source Heat Pumps

2019

View full text Add to dashboard Cite

A solar cooling and heating system incorporated with two air-source heat pumps was installed in Ningbo City, China and has been operating since 2018. It is composed of 40 evacuated tube modules with a total aperture area of 120 m 2 , a single-stage and LiBr-water-based absorption chiller with a cooling capacity of 35 kW, a cooling tower, a hot water storage tank, a buffer tank, and two air-source heat pumps, each with a rated cooling capacity of 23.8 kW and heating capacity of 33 kW as the auxiliary system. This paper presents the operational results and performance evaluation of the system during the summer cooling and winter heatingperiod, as well as on a typical summer day in 2018. It was found that the collector field yield and cooling energy yield increased by more than 40% when the solar cooling and heating system is incorporated with heat pumps. The annual average collector efficiency was 44% for cooling and 42% for heating, and the average coefficient of performance (COP) of the absorption chiller ranged between 0.68 and 0.76. The annual average solar fraction reached 56.6% for cooling and 62.5% for heating respectively. The yearly electricity savings accounted for 41.1% of the total electricity consumption for building cooling and heating.Energies 2019, 12, 996 2 of 17 single-effect LiBr-water absorption chiller in Madrid. The maximum instantaneous coefficient of performance (COP) (COP is the ratio of cooling energy yield and heat supplied by the generator), daily average COP and average COP during the period of 20 days of monitoring (25/07/2003 to 19/08/2003) were 0.60, 0.42, and 0.34, respectively. Pongtornkulpanich et al.[5] tested a 10-ton single effect LiBr-water absorption chiller powered by an evacuated tube solar collector in Thailand where the solar collector delivered 81% of the thermal energy for the chiller. Rosiek and Batlles [6] analyzed the behavior of the solar-assisted air-conditioning system installed in the CIESOL building to maximize the use of solar thermal energy supplying the cooling and heating system. The average values of coefficient of performance and the cooling capacity in summer months were 0.6 and 40 kW, respectively. Bermejo et al.[7] built and tested a solar/gas-driven double effect LiBr-water absorption system in Spain. The system could be driven by a direct-fired natural gas burner or by pressurized hot water delivered from a linear concentrating Fresnel collector. The average and maximum daily efficiencies of the solar collector were 0.35 and 0.4, respectively. The daily average COP of the chiller was 1.1-1.25. Lizarte et al. [8] experimentally studied a vacuum flat-plate collector-driven 4.5 kW air-cooled single-effect LiBr-water absorption chiller in Madrid. It was found that the mean COP and solar coefficient of performance (SCOP) (the ratio of cooling energy yield and the total solar energy available) were 0.53 and 0.06, respectively. Balghouthi et al. [9] presented a solar absorption cooling installation in Tunisia where it was found that the coefficient of perfor...

show abstract

Section: Heat Pumpsmentioning

confidence: 99%

Section: Heat Pumpsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Installation and Operation of a Solar Cooling and Heating System Incorporated with Air-Source Heat Pumps

2019

View full text Add to dashboard Cite

show abstract

“…There has also been a search for alternatives to vapor‐compression technology ( Figure 1 ), with the current unprecedented degree of urgency pushing researchers to develop some radical technologies . One example is absorption and adsorption refrigeration, which holds a lot of promise when waste or renewable heat is available. Other thermally driven alternatives are ejector refrigeration systems, which, like sorption technologies, perform work without moving parts based on low‐temperature thermal resources .…”

Section: Introductionmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

377

156

View full text Add to dashboard Cite

The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

show abstract