Integration of Evacuated Tubular Solar Collectors With Lithium Bromide Absorption Cooling Systems

Ward, D. S.; Duff, William S.; Ward, John; Löf, G.O.G.

doi:10.1016/b978-1-4832-8407-1.50303-2

Cited by 8 publications

(8 citation statements)

References 1 publication

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“…consists of an efficient heat exchanger combining the CO 2 condenser with H 2 O evaporator. However, this reduces its possibility for direct use of a cooling tower to cool down the condenser in cold seasons, while sorption system itself can be applied for heating as a heat pump (Chen et al, 2010;Grzebielec, 2009;Starace et al, 2014;Wang et al, 2005;Ward et al, 1979). The concept of the presented system is the composition of the HT adsorption with LT compression cycle shown in Fig.…”

Section: Objective Scope and Methodology Of Workmentioning

confidence: 99%

An innovative ecological hybrid refrigeration cycle for high power refrigeration facility

Cyklis¹,

Janisz²

2015

Chemical and Process Engineering

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Searching for new refrigerants is one of the most significant scientific problems in refrigeration. There are ecological refrigerants commonly known: H 2 O and CO 2 . H 2 O and CO 2 known as natural refrigerants, but they have problems:a high freezing point of H 2 O and a low triple point of CO 2 . These problems can be solved by the application of a hybrid sorption-compression refrigeration cycle. The cycle combines the application possibility of H 2 O in the high temperature sorption stage and the low temperature application of CO 2 in the compression stage. This solution gives significant energy savings in comparison with the two-stage compressor cycle and with the one-stage transcritical CO 2 cycle. Besides, the sorption cycle may be powered by low temperature waste heat or renewable heat. This is an original idea of the authors. In the paper an analysis of the possible extension of this solution for high capacity industrial refrigeration is presented. The estimated energy savings as well as TEWI (Total Equivalent Warming Impact) index for ecological gains are calculated.

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Section: Objective Scope and Methodology Of Workmentioning

confidence: 99%

An innovative ecological hybrid refrigeration cycle for high power refrigeration facility

Cyklis¹,

Janisz²

2015

Chemical and Process Engineering

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“…In applications where there is a snow overnight, snow removal requires longer melting periods than conventional¯at-plate collectors because snow slide-o is generally impeded by the geometrical shape and tubular design of the evacuated tube solar collectors. For evacuated tube collectors, a stagnation temperature (the stagnation temperature is the temperature of the absorber under an equilibrium, no-¯ow condition of the collector heat transfer¯uid) of 2808C was observed by Ward et al [8] for a solar intensity of 769 W/m 2 . Such a condition emphasizes the need for careful design of the solar heating and cooling operation.…”

Section: Conventional¯at-plate Collectors and Evacuated Tube Collectorsmentioning

confidence: 96%

“…Selective coated absorbers with single-glass covered¯at-plate collectors were also employed in many systems [40± 42]. Ward et al [8] have pointed out that the use of evacuated tubular solar collectors permits the collection of solar energy at lower solar radiation levels (about 0.14 kW/m 2 vs 0.25±0.30 kW/m 2 for¯at-plate collectors), and thus provides solar energy for heating and cooling earlier in the morning and later in the evening. This increases the availability of solar radiation during those periods of load demand.…”

Section: Conventional¯at-plate Collectors and Evacuated Tube Collectorsmentioning

confidence: 99%

Technology development in the solar absorption air-conditioning systems

Sumathy

2000

Renewable and Sustainable Energy Reviews

130

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An environmental control system utilizing solar energy would generally be more costeective if it were used to provide both heating and cooling requirements in the building it serves. Various solar powered heating systems have been tested extensively, but solar powered air-conditioners have received little more than short-term demonstration attention. This paper reviews past eorts in the ®eld of solar powered air-conditioning systems with the absorption pair of lithium bromide and water. A number of attempts have been made by researchers to improve the performance of the solar applied air-conditioning (chiller) subsystems. It is seen that the generator inlet temperature of the chiller is the most important parameter in the design and fabrication of a solar powered air-conditioning system. While collector choice, system design and arrangement are other impacting factors for the system operation. 7

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“…In regions with mild winters, the use of low-loss evacuated tube collectors and heavily insulated external piping often can retard freezing for the duration of the longest cold night while preventing it during overcast cold days (Ward et al 1979). Instances of total reliance on this approach have been reported by R. Bruno of The Philips Research Laboratories, Aachen, but available information suggests that backup controls have been provided on all surviving systems in moderate climates.…”

Section: ::-4~5~5mentioning

confidence: 99%

Central Unresolved Issues in Thermal Energy Storage for Building Heating and Cooling

Swet¹,

Baylin²

1980

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Integration of Evacuated Tubular Solar Collectors With Lithium Bromide Absorption Cooling Systems

Cited by 8 publications

References 1 publication

An innovative ecological hybrid refrigeration cycle for high power refrigeration facility

An innovative ecological hybrid refrigeration cycle for high power refrigeration facility

Technology development in the solar absorption air-conditioning systems

Central Unresolved Issues in Thermal Energy Storage for Building Heating and Cooling

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