Optimum insulation thickness for pipes in district heating systems – review

İlhan, Utku

doi:10.30464/jmee.2018.2.3.225

Cited by 6 publications

(7 citation statements)

References 12 publications

(33 reference statements)

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“…Therefore, this study introduced an air gap to decrease the insulation quantity required to reduce energy loss. The optimum insulation thickness corresponding to maximum cost savings of the building envelope (Açıkkalp & Kandemir 2019;Axaopoulos et al 2019;Orzechowski & Orzechowski 2018), pipes (İlhan 2018;Martin-Du Pan et al 2019;Ucar 2018;Yin et al 2018), and ducts (Kumar et al 2019;Kumar et al 2018a;Kumar et al 2018b;Kumar et al 2018c, Soponpongpipat et al 2010Yildiz & Ersöz 2016) was investigated by using LCC analysis. The present research also conducts the LCC analysis to determine the impact of an air gap on (Kumar et al 2019;Kumar et al 2018a;Kumar et al 2018b;Kumar et al 2018c;Soponpongpipat et al 2010;Yildiz & Ersöz 2016) considering the prevailing economic circumstances of a country (inflation and interest rate) on insulation investment and fuel billings (Huang et al 2019;Kumar et al 2019).…”

Section: Description Of Heating Ventilation and Airmentioning

confidence: 99%

“…For instance, insulation costs are used to save operation energy costs by reducing fuel consumption related to heat loss. The net savings is achieved by decreasing the heat gain and loss to/from the duct into the surrounding because it overcomes the insulation cost required over the expected service time of the building services.The LCC analysis estimates the optimum insulation thickness corresponding to maximum cost savings of the building envelope(Açıkkalp & Kandemir 2019;Axaopoulos et al 2019;Orzechowski & Orzechowski 2018), pipes(İlhan 2018;Martin-Du Pan et al 2019;Ucar 2018;Yin et al 2018), and ducts…”

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confidence: 99%

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Lifecycle cost analysis of an insulated duct with an air gap

Kumar

Khan

Abro

2021

Environ Sci Pollut Res

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The insulation materials are used to reduce heat loss to/from the ducts with additional investment. This study aims to reduce this additional investment in the duct application by introducing an air gap between insulation and duct surface. It uses Life Cycle Cost (LCC) analysis to determine the economic benefits of the air gap considering four insulation materials for insulating the duct and natural gas as an energy source for chiller operation. The preliminary data regarding design and operating parameters were obtained from a renowned pharmaceutical company. The duct's annual energy loss was estimated for given operation hours in a year using the preliminary data and ambient conditions. The estimated energy loss through the duct is fed in LCC analysis to determine the impact of the air gap on optimum insulation thickness corresponding to the minimum LCC and payback period. The results show that the introduced air gap in an insulated duct lowers the optimum insulation thickness for the duct. As a result, the air gap maximizes the cost savings and minimizes the payback period. The expanded polystyrene is investigated as the most economical with maximum cost savings of USD 508.8-USD $766.8/m/year and a payback period of 1.15-1.17 years for the duct applications. Contrary, the air gap is determined the most effective in terms of cost and emission savings for the ducts insulated with rock wool. In conclusion, an air gap is an economical option for duct applications.

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Section: Description Of Heating Ventilation and Airmentioning

confidence: 99%

mentioning

confidence: 99%

Lifecycle cost analysis of an insulated duct with an air gap

Kumar

Khan

Abro

2021

Environ Sci Pollut Res

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“…The LCC analysis estimates the optimum insulation thickness corresponding to maximum cost savings of the building envelope (Açıkkalp & Kandemir 2019;Axaopoulos et al 2019;Orzechowski & Orzechowski 2018), pipes (İlhan 2018;Martin-Du Pan et al 2019;Ucar 2018;187 Yin et al 2018), and ducts (Kumar et al 2019;Kumar et al 2018a;Kumar et al 2018b;Kumar et al 2018c;Soponpongpipat et al 2010;Yildiz & Ersöz 2016) considering the prevailing economic circumstances of a country (inflation and interest rate) on insulation investment and fuel billings (Huang et al 2019;Kumar et al 2019). In this analysis following assumption are made:…”

Section: Life Cycle Cost Analysismentioning

confidence: 99%

“…Therefore, this study introduced an air gap to decrease the insulation quantity required to reduce energy loss. The optimum insulation thickness corresponding to maximum cost savings of the building envelope (Açıkkalp & Kandemir 2019;Axaopoulos et al 2019;Orzechowski & Orzechowski 2018), pipes (İlhan 2018;Martin-Du Pan et al 2019;Ucar 2018;Yin et al 2018), and 154 ducts (Kumar et al 2019;Kumar et al 2018a;Kumar et al 2018b;Kumar et al 2018c, 155 Soponpongpipat et al 2010Yildiz & Ersöz 2016) was investigated by using LCC analysis. The 156 present research also conducts the LCC analysis to determine the impact of an air gap on 157 In this research, the design and operating parameters were collected from the HVAC duct installed in a pharmaceutical company, Jamshoro, Pakistan, as given in Table 1…”

mentioning

confidence: 99%

Lifecycle Cost Analysis of An Insulated Duct With An Air Gap

Kumar

Khan

Abro

2021

Preprint

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The insulation materials are used to reduce heat loss to/from the ducts with additional investment. This study aims to reduce this additional investment in the duct application by introducing an air gap between insulation and duct surface. It uses Life Cycle Cost (LCC) analysis to determine the economic benefits of the air gap considering four insulation materials for insulating the duct and natural gas as an energy source for chiller operation. The preliminary data regarding design and operating parameters were obtained from a renowned pharmaceutical company. The duct's annual energy loss was estimated for given operation hours in a year using the preliminary data and ambient conditions. The estimated energy loss through the duct is fed in LCC analysis to determine the impact of the air gap on optimum insulation thickness corresponding to the minimum LCC and payback period. The results show that the introduced air gap in an insulated duct lowers the optimum insulation thickness for the duct. As a result, the air gap maximizes the cost savings and minimizes the payback period. The expanded polystyrene is investigated as the most economical with maximum cost savings of USD 508.8-USD $766.8/m/year and a payback period of 1.15–1.17 years for the duct applications. Contrary, the air gap is determined the most effective in terms of cost and emission savings for the ducts insulated with rock wool. In conclusion, an air gap is an economical option for duct applications.

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“…However, increasing the insulation thickness after a point will not affect the reduction of heat losses. Thus, a balance point should be determined between the insulation material cost with energy savings obtained, and this point is called the optimal insulation thickness [14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Energy, exergy analysis and optimization of insulation thickness on buildings in a low-temperature district heating system

Terhan

ABAK

2023

Journal of Thermal Engineering

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In the study, energy and exergy analysis of the buildings on a campus in Turkey are conducted by using actual operating data and taking measurements in the district heating system as a case study. The energy and exergy demands, losses that stem from all buildings are calculated according to average daily outdoor temperature data. Due to the high heat losses in the buildings, determining the optimal insulation thickness for the exterior wall should be investigated. Therefore, optimal insulation thicknesses, energy savings, fuel consumptions and payback periods of the insulation material on the exterior wall of the building are examined by using Life Cycle Assessment and P1–P2 method for natural gas. Optimal insulation thicknesses are calculated for different insulation materials such as XPS, glass wool, rock wool and EPS for the climatic regions (HDD=800–4250°C days). According to average exergy losses from the building components per unit area, the average total exergy loss is calculated as 2.39×10-2 kW/m2.year and 1.42×10-3 kW/m2 (5.92%) of this loss stems from the exterior walls, 1.93×10-3 kW/m2 (8.07%) from the floors, 7.37×10-4 kW/m2 (3.08%) from the roofs, 1.58×10-2 kW/m2 (65.99%) from the windows and doors, 4.04×10-3 kW/m2 (16.92%) from the ventilation with infiltration. Energy requirement values of the building are found between 2.68–25.70 kWh/m3 towards from the warmest to the coldest climatic region for the uninsulated wall. In the un-insulated state, fuel consumption varies between 1.93-18.48 m3/m2 from the warmest to the coldest region. The optimal insulation thickness values of the building’s exterior wall are calculated as between 2.3–10.0 cm according to different climatic regions. In-state of exterior wall insulation of 3 cm, fuel consumption decreases by 46.63%–53.46% compared to different insulation materials and climatic regions compared to the un-insulated state.

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Optimum insulation thickness for pipes in district heating systems – review

Cited by 6 publications

References 12 publications

Lifecycle cost analysis of an insulated duct with an air gap

Lifecycle cost analysis of an insulated duct with an air gap

Lifecycle Cost Analysis of An Insulated Duct With An Air Gap

Energy, exergy analysis and optimization of insulation thickness on buildings in a low-temperature district heating system

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