[Time-Limited Quick Answer Contest, Phase 3] 002 (Completed) (2 users won prizes + 40 wealth points)

First, consider the insulation efficiency, which is the rate of reduction in heat loss under insulated conditions compared to exposed conditions. Second, the thermal efficiency of the pipeline: when a heat carrier is transported through a pipeline, if the heat obtained by the heat carrier from the previous stage of equipment is Q1, and the heat lost due to thermal losses in the pipeline is Q2, then the heat transferred by the heat carrier to the next stage is Q3. Thus, Q1 = Q2 + Q3, and the thermal efficiency is given by n = Q3/Q1 * 100%

There are two criteria for measuring the effectiveness of heat insulation in industrial production: one is the quality of the insulating material, and the other is the quality of the construction work. The quality of insulation materials depends on whether the materials chosen meet the manufacturing standards ； The quality of construction depends on whether it is carried out in strict accordance with the construction standards, and whether the surface cooling temperature meets the design requirements.

Tests and evaluations of the insulation performance of equipment and pipelines can be found at http://bbs.hcbbs.com/search.php?searchid=2050&orderby=lastpost&ascdesc=desc&searchsubmit=yes. For building insulation: 1. The thermal conductivity is an indicator used to measure the insulation performance of insulating materials. 2. Porosity. 3. Water absorption rate is also an important indicator for assessing the stability of the insulation performance of insulating materials. 4. Construction quality.

There are 4 criteria for measuring the effectiveness of insulation in industrial production: one is the quality of the insulating material, another is the quality of the insulation installation, and then there is the quality of pipeline installation； Another factor is the durability of various insulation layers. The quality of insulation materials depends on whether the selected materials meet the manufacturing standards and suit the local geological conditions ； The quality of thermal insulation work depends on whether the construction is carried out in strict accordance with the relevant standards, whether the surface temperature for heat dissipation meets the design requirements, and whether all joints are properly sealed ； The quality of pipeline construction depends mainly on whether the pipeline material meets the construction requirements, whether all welding areas have been properly treated, and whether there are any issues such as heat or fluid leakage ； Durability refers to the length of time during which various insulation materials can maintain their physical properties in the operating environment; the longer this period, the better. It is related to the material composition of the insulation materials and the geological conditions, as well as the operating environment ；

The quality of insulation materials depends on whether the selected materials meet the manufacturing standards and suit the local geological conditions； The quality of thermal insulation work depends on whether the construction is carried out in strict accordance with the relevant standards, whether the surface temperature for heat dissipation meets the design requirements, and whether all joints are properly sealed ； Durability refers to the longer period during which physical properties can be maintained in an operating environment.

The most direct way is to check the temperature maintenance of the pipeline. Pipe insulation depends mainly on the type and quality of the insulating material chosen, the thickness of the insulation layer, whether it meets the process requirements, as well as construction quality issues. Common insulation materials include inorganic insulation materials and organic insulation materials. Inorganic insulation materials can be classified into three types based on their structure: fibrous materials, granular materials, and porous materials. Fiber materials include asbestos, slag wool, Tianshan rock wool, and glass wool; granular materials include expanded vermiculite and expanded perlite; porous materials include aerated concrete, foam concrete, microporous calcium silicate insulation materials, and foam glass. Organic insulation materials mainly include cork products, cork fiber boards and decorative sound-absorbing panels, pine boards, wood wool boards, hemp shavings boards, felt, honeycomb panels, etc. Foam plastics are also new materials that have been developed recently. Common choices for insulation materials: 1. Rock wool for ≤250 ℃; 2. Composite magnesium aluminum silicate products for 251~500 ℃; 3. Aluminum silicate fiber products for 501~700 ℃ ℃

From different perspectives, there are several indicators for evaluating the insulation performance. I. Insulation efficiency (η%) The insulation efficiency refers solely to the rate of reduction (or recovery) in heat loss after insulation, as compared to the condition without insulation. Let the heat flow rate during exposure be Qn1, and the heat flow rate after insulation be Q1; Q1

1. If calculated roughly, it comes down to assessing the extent of the impact on production and the increase in consumption; if there is a significant reduction in production or an increase in consumption due to this issue, it indicates that the insulation is inadequate. If the impact is within the acceptable range (the difference from the theoretical yield is within the limits specified by industry standards), it proves that the insulation is satisfactory ； 2. If precise measurement is required, more accurate instruments are needed for it. The temperature difference before and after the pipeline should be within the acceptable range or very small; if it is significant, then, after ruling out other factors, it indicates that the insulation capacity is insufficient. In such cases, it is necessary to replace the insulation material with a different type or check for any issues related to the installation process.

I think there is a very simple way to determine the quality of insulation performance: given the temperature T0 of the medium being insulated, use an infrared thermometer or similar device to measure the temperature T1 outside the insulating layer. Let T = T0 – T1; the larger the value of T, the better the insulation performance, regardless of whether the medium inside is cold or hot. The poster’s question is likely about how to measure the insulation performance, rather than how to improve it.

There are two criteria for measuring the effectiveness of insulation in industrial production: one is the quality of the insulation itself, and the other is the quality of the insulation installation work. The quality of heat retention depends on the heat loss rate. The quality of insulation work depends first and foremost on the quality, appearance, and strength of the insulation material. The quality of insulation materials depends on whether the selected materials meet the manufacturing standards and suit the local geological conditions ； The quality of insulation installation depends on whether the construction is carried out in strict accordance with the standards, and whether all joints are sealed properly ；