Solar Thermal System

Solar thermal power generation is an important aspect of solar thermal utilization. This technology uses collectors to collect the solar radiation heat through the heat storage medium (molten salt and heating oil), then concentrates the heat to feed water to generate steam, and generates electricity through steam turbines and generators.

At present, traditional materials such as aluminum silicate, rock wool are frequently used for heat storage tank and pipeline. Which leads to high heat loss. Because of the preciousness of the energy, how to reduce the heat loss and improve the uiliation of solar energy is particularly important.

Advantage:

1. Effectively reduce the heat loss of the pipeline and improve the utilization and conversion rate of light and heat;

2. Inorganic materials, stable structure, and a service life of up to 20 years;

3. Low thermal conductivity, reducing the thickness of the insulation layer;

4. Convenient construction and easy cutting.

The specific comparison with traditional insulation materials is shown in the table below

Lightweight series		Nano Aerogel Blanket	Traditional insulation materials
			Aluminum silicate	Glass wool	Rock wool
Thermal conductivityW/(m·K)	25℃	0.018	0.035	0.038	0.036
	100℃	0.024	0.05	0.051	0.049
	300℃	0.034	0.09	——	0.091
Maximum use temperature，℃		650	800	400	400
Bulk density，kg/m³		170~210	120~150	40~60	100~120
Water resistance		Water repellency rate ≥99%, volume moisture absorption rate ≤1%, no special waterproof measures are required. The detachable thermal insulation cover has good thermal insulation effect and is easy to use.	It is not completely waterproof, and the surface of the protective plate needs to be sprayed with metal sealant for waterproofing.
Insulation of tees, valves, etc.		The detachable thermal insulation cover has good thermal insulation effect and is easy to use.	Spraying method or heat preservation box heat preservation, the heat preservation effect is poor
Compressive strength (25%)		≥120Kpa	Felt products: Compression becomes largerPlate-shaped products: brittle and fragile
		1. Good integrity, good seismic and tensile resistance, no particle accumulation, sedimentation, etc. during use; 2. The shrinkage rate in the 20-year simulation test is less than 1%, and the thermal conductivity has no change.	1. The material structure is loose, self-weight, equipment vibration, material water ingress, etc. easily cause the material to disintegrate and settle, and the heat preservation effect is obviously reduced.
Others		The use of small thickness can reduce the insulation thickness of the pipeline, reduce the spacing of the steam pipeline, and reduce the area of the plant or the size of the pipe gallery.	The insulation layer is thick, and there are gaps in the lap joints. The higher coefficient of expansion and contraction can easily cause the gaps to become thermal bridges, which are more obvious after vibration.

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