Modeling and optimization of HVAC system for special ships

Volintiru, O. N.; Scurtu, Ionuţ Cristian; Stefănescu, T. M.

doi:10.1088/1742-6596/1122/1/012004

Cited by 9 publications

(6 citation statements)

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“…The solution of the reshaped Eqs. ( 5) and (6) give an appropriate variation of temperature, in accordance with the thermal flux lost by a diver in the abovementioned conditions of gas breathing. The curves in Fig.…”

Section: Theoretical Resultsmentioning

confidence: 98%

“…The theoretical and experimental studies of Majchrzycka [4], and King [5] referred to a human body in pressurized facilities, but in dry environment. The temperature distribution in the atmosphere of the dry hyperbaric chamber, provided by the specific thermal conditioning installations [6], influences the heat losses of the divers at saturation.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of the Heat Balance Equation Accuracy, in the Case of Saturation Diving

Constantin

Stanciu

2021

Teh. glas. (Online)

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The body temperature of a diver is one of the most important aspects of the concept of underwater safety and comfort. The heat balance equation previously established, was improved in this paper by introducing a linear dependence of the absolute humidity on the body temperature, as the absolute humidity influences the latent heat flux needed for the humidification of the breathing gas. The solution of the new proposed heat balance equation is a step forward in assessing the body temperature in both cases of unitary and saturation diving. The paper presents the equation and its solutions in the case of breathing either air or Heliox and compares the theoretical results with the values measured in the frame of simulated saturation diving with Heliox 5/95, in the hyperbaic laboratory. The proposed equation predicts the body temperature of the diver, at the end of a 30 minutes immersion with a good accuracy. The relative error is up to 1%.

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Section: Theoretical Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Improvement of the Heat Balance Equation Accuracy, in the Case of Saturation Diving

Constantin

Stanciu

2021

Teh. glas. (Online)

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“…The thermo-technical characteristics of the tire are as follows: for the roof, the heat transfer coefficient is λ = 0.9 W / m 2 K, the floor has λ = 1.1 W / m 2 K, for the walls λ = 1.1 W / m 2 K and the windows have λ = 1.05 W / m 2 K. Free convection defined for each surface. The radiators have described with a temperature gradient of ΔT=80 0 C. [13,12] The resultant heat calculated with the relation: The software used for CFD analysis is ANSYS FLUENT. A fine discretisation was generated, with a minimum step of 5 cm and a maximum of 8 cm.…”

Section: Heating With Radiators Modelled With Ansys Fluentmentioning

confidence: 99%

“…The thickness of the walls varies from 110 cm to 85 cm. With the plan dimensions of 40.61 m and 15.04 wide and with an average height of 9.81 m, the church closes a volume of 2710 m 3 with a tire surface of 1370 m 2 [12,13].…”

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confidence: 99%

The indoor climate modelling and the economic analysis regarding the energetic rehabilitation of church

Țurcanu¹,

Verdeș²,

Ciocan³

et al. 2020

Technium

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The paper describes the behaviour of a heating system with radiators in a cult building. There has commonly used in many churches with many shortcomings. The temperature distribution in the analysed space is simulated in 2D. The simulation is based on an example, the Cathedral of the Assumption of the Virgin Mary in Jassy. The heating system with radiators simulated with the FLUENT program, the results being edifying for the factual state of the building. An important aspect is the impact of these heating systems on the works of art, the church being the 18th — century edifice. Current environmental issues lead to the continuous development of technologies used to reduce primary energy consumption. Churches are an invaluable wealth, sheltering heritage elements preserved in museums and historic buildings. Unheated churches have been used for centuries. Then, after installing one or more different heating systems, signs of rapid degradation appeared.

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“…practically in all waste heat recovery technics [8,9]. Different methods of modeling [10,11] and optimization [12] of such heat recovery technics are used.…”

Section: Introductionmentioning

confidence: 99%

Improving the efficiency of heat recovery circuits of cogeneration plants with combustion of water-fuel emulsions

Kornienko

Radchenko

et al. 2021

THERM SCI

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When using modern highly efficient internal combustion engines with lowered potential of exhaust heat the heat recovery systems receive increasing attention. The efficiency of combustion exhaust heat recovery at the low potential level can be enhanced by deep cooling the combustion products below a dew point temperature, which is practically the only possibility for reducing the temperature of boiler exhaust gas, while ensuring the reliability, environmental friendliness and economy of power plant. The aim of research is to investigate the influence of multiplicity of circulation and temperature difference at the exit of exhaust gas boiler heating surfaces, which values are varying as 20, 15, 10?C, on exhaust gas boiler characteristics. The calculations were performed to compare the constructive and thermal characteristics of the various waste heat recovery circuits and exhaust gas boiler of ship power plant. Their results showed that due to application of condensing heating surfaces in exhaust gas boiler the total heat capacity and steam capacity of exhaust gas boiler increases. The increase of exhaust gas boiler heat capacity is proportional to the growth of its overall dimensions. A direct-flow design of the boiler provides a significant increase in heat efficiency and decrease in dimensions. In addition, a direct-flow boiler circuit does not need steam separator, circulation pump, the capital cost of which is about half (or even more) of heating surface cost.

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Modeling and optimization of HVAC system for special ships

Cited by 9 publications

References 0 publications

Improvement of the Heat Balance Equation Accuracy, in the Case of Saturation Diving

Improvement of the Heat Balance Equation Accuracy, in the Case of Saturation Diving

The indoor climate modelling and the economic analysis regarding the energetic rehabilitation of church

Improving the efficiency of heat recovery circuits of cogeneration plants with combustion of water-fuel emulsions

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