Presentation of new approach for energy consumption reduction with use of solar system

Abstract

In hot and humid areas with high solar radiation intensity, the use of air conditioning systems on the basis of desiccant materials such as solar desiccant cooling systems with a view to reducing energy consumption and economic saving can be a good alternative to conventional air conditioning units. In this paper, in order to offer a cooling load of a sample space in the city of Bandar Abbas, which has a high latent load and high radiation intensity, solar absorption cooling cycle has been considered as the base cycle, and two absorption cooling cycles were designed for comparison. Then the three cycles were modeled in the TRNSYS software, studied technically and economically, and at the end the best cycle has been selected. In terms of current energy prices, application of solar energy in Iran is not economically feasible, so the solar absorption refrigeration cycle has been considered as the basic system for the cycle’s comparison. Modeling of the expressed cycles was done in TRNSYS software. The basic cycle has been composed of two main parts of cooling by absorption chillers and providing the required heat supply by the solar collector, and also two desiccant dehumidification cycles have been added by a desiccant dehumidification system. In the economic analysis of the three systems, the costs estimation during lifetime (LCC) method also has been used. As a result of this modeling and due to the Act to amend energy prices, the cooling system with the help of desiccant wheel and using returned water of chiller’s generator as the regeneration source, with an annual energy saving of about 29.1%, 29.1% (1,371,980 m3) of natural gas consumption has been saved and the amount of 18/15% (156,667$) cost savings over 20 years compared to the base period, has been selected as the most efficient cooling system.

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Abbreviations

\( \dot{Q} \) :

Heat transfer rate

T :

Temperature

\( \dot{m} \) :

Mass flow rate

h :

Sensible enthalpy

\( \tau \alpha \) :

Coefficient represents the effect of the pass

U L :

Overall heat loss coefficient

C p :

Specific heat capacity at constant pressure

I :

Solar radiation intensity

A :

Surface area

w :

Humidity ratio

Capacity:

Cooling capacity of the chiller

\( \bar{T} \) :

The average air temperature

C min :

Minimum capacity

f FullLoadCapacity :

Fraction of the nominal load generated by the chiller

f NominalCapacity :

A fraction of the full load capacity

C s :

Initial cost

C A :

Price per square meter of collector area

C v :

Price per cubic meter of storage tank

V s :

Volume of tank

C aux :

The cost of fuel in auxiliary heater

C g :

Price per cubic meter of natural gas

L v :

Thermal value of natural gas

Q aux :

Energy from fuel

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Correspondence to Houman Babazadeh.

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Sani, A.L., Ayani, M., Behbahani-Nia, S.A. et al. Presentation of new approach for energy consumption reduction with use of solar system. J Therm Anal Calorim 143, 705–714 (2021). https://doi.org/10.1007/s10973-019-09252-y

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Keywords

  • Solar cooling
  • Absorption chiller
  • Solar collector
  • Desiccant cooling