Investigations into the thermal performance of multilayer insulation (300-77 K) Part 1: Calorimetric studies

Jacob, S.; Kasthurirengan, S.; Karunanithi, R.

doi:10.1016/0011-2275(92)90328-8

Cited by 18 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One was the calorimeter measurement [6][7][8], in which the thermal performance was measured based on the evaporation rate of liquid nitrogen from the boil-off tank. The other was based on the local heat flux measurement [3] from the temperature distribution on the outermost MLI blanket surface.…”

Section: Analysis Methodsmentioning

confidence: 99%

“…The detail of the present boil-off calorimeter is not presented here, as it was fully described in [3]. The vacuum chamber was evacuated by a turbomolecular pump down to pressure of the order of 10 −4 Pa [6]. The vacuum chamber temperature was regulated to be a constant temperature of 300 K by circulating water through the water jacket from the water chiller.…”

Section: Boil-off Calorimetermentioning

confidence: 99%

See 1 more Smart Citation

Effect of Size on Thermal Performance of Limited Size Multilayer Insulation

Kawasaki

Okazaki²,

Murakami³

et al. 2014

Journal of Thermophysics and Heat Transfer

View full text Add to dashboard Cite

Multilayer insulation blankets are used in various sizes for thermal control of space systems. These multilayer insulation blankets are processed, usually by being seamed and patched. It is qualitatively understood that the thermal performance of small size multilayer insulation is more or less deteriorated. The effects of size of space use multilayer insulation blankets on thermal performance are known qualitatively, but not quantitatively. In this study, the thermal performance of limited size multilayer insulation blankets was measured by using the boil-off calorimeter method with liquid nitrogen. The temperature distribution on a rectangular multilayer insulation was also measured in order to investigate the nonuniformity of the local heat flux across the rectangular multilayer insulation. Thermal performance declines with the decrease of multilayer insulation area. This is because the local heat flux drastically increases in the hem region and the gap between the edge of blanket and base plate. Based on these measurement results, an equation to predict the thermal performance of multilayer insulation blankets of limited size was proposed. Nomenclature A = area, m 2 C = proportional constant C H = proportional constant in Eq. (11), W m −1 C L = constant of hem effect, W m −1 d = diameter, m G = evaporation rate of LN 2 , kg s −1 fN b ; t = function of multilayer insulation layer density, W m −2 h L = latent heat of evaporation, J kg −1 L = total hem length, m N b = layer number of multilayer insulation blanket, -Q = amount of heat, W q = heat flux, W m −2 T = temperature, K t = thickness, m x = distance from processed hem, m ε = emissivity,ρ = density, kg m −3 σ = Stefan-Boltzmann constant, W m −2 K −4 Subscripts B = boil-off tank or base plate BV = direct path from vacuum chamber to boil-off tank C-MLI = control multilayer insulation blanket, masking multilayer insulation blanket eff = effective value G = gap g = vapor Hem = hem of multilayer insulation blanket l = liquid MLI = outermost surface of multilayer insulation, test multilayer insulation MLI-B = bulk area of multilayer insulation, nonprocessed area of multilayer insulation N = number of layers, number of test multilayer insulation n = number of control multilayer insulation blankets S = outermost surface of multilayer insulation S0 ∼ S30 = name of multilayer insulation in Table 3 Total = total heat into boil-off tank, experimentally measured from the evaporation rate V = vacuum chamber

show abstract

Section: Analysis Methodsmentioning

confidence: 99%

Section: Boil-off Calorimetermentioning

confidence: 99%

Effect of Size on Thermal Performance of Limited Size Multilayer Insulation

Kawasaki

Okazaki²,

Murakami³

et al. 2014

Journal of Thermophysics and Heat Transfer

View full text Add to dashboard Cite

show abstract

“…[10][11][12][13][14][15][16][17][18][19][20]. The same characteristics that allow TF insulation to perform in those industries can also be applied to the petroleum industry.…”

Section: Thin-film Insulationmentioning

confidence: 98%

Flow Assurance Begins with Downhole Insulation

Lively¹

2002

All Days

View full text Add to dashboard Cite

Thin-Film (TF) insulation combined with an insulating packer fluid is an effective and proven method for insulating downhole production tubing and casing in order to preserve reservoir heat and to enhance startup conditions. Modeling indicates that this system can increase FWHT by as much as 25°F-30°F as flow rates decline.Combining these technologies enables heat losses at couplings, valves, gauges and other components without insulation to be controlled. An aqueous based packer fluid inhibits the formation of convection currents that commonly occur in standard brine completion fluids, resulting in an overall heat transfer coefficient that is more than 10 times lower than standard completion fluids. These technologies are cost effective, readily available and provide numerous advantages over traditional completion systems.Until the last few years the only option for downhole insulation has been vacuum insulated tubing (VIT); however many applications cannot support the economics of VIT nor do they require the low thermal conductivity that VIT provides.Any one of these technologies can be used alone or in combination with another depending on the application. In some applications all three may be required to accomplish the objective.

show abstract

“…1,2,3,4,5,6,7,8,9,10 Thin-film, multi-layered insulation relies on the proven principle that thermal resistances are additive. When the thermal resistance from each layer of the material is added to the thermal resistance at the interface between layers of material and to the contact resistance of the fluid to the coating, then the subsequent total thermal resistance is greater than a single thick layer.…”

Section: Selection Of Insulation Materialsmentioning

confidence: 99%

A New Insulation Technology: Prediction vs. Results From the First Field Installation

Horn

Lively²

2001

All Days

View full text Add to dashboard Cite

Insulation is a critical aspect of offshore production systems, particularly in deeper waters where low ambient temperatures must be addressed and accommodated. The problems are normally associated with the effects on the flow stream when heat is lost to the surrounding environment. However, there are some situations where it is not the effects on the production stream from heat loss that is the problem, but the effects on the surrounding environment that creates the problem. This paper primarily focuses on the situation where reservoir heat in a production stream creates a technical problem in the area surrounding a well bore. The paper then presents a new insulation technology that was evaluated as part of the solution and discusses the successful outcome. The results are then used to address the potential utilization of this new technology for other flow assurance related heat control applications where the retention of heat in the production stream is desired, such as the need for insulating subsea flow lines, jumpers, manifolds, xmas trees, production risers and other associated production equipment.

show abstract

Investigations into the thermal performance of multilayer insulation (300-77 K) Part 1: Calorimetric studies

Cited by 18 publications

References 5 publications

Effect of Size on Thermal Performance of Limited Size Multilayer Insulation

Effect of Size on Thermal Performance of Limited Size Multilayer Insulation

Flow Assurance Begins with Downhole Insulation

A New Insulation Technology: Prediction vs. Results From the First Field Installation

Contact Info

Product

Resources

About