Table of Contents

1. Solar Hot Air Heating Collectors–Working Principle

Name: Riwatt
Address: No.100,Gongren Road, Haining City, 314400, CN
Telephone: +86 180 0660 1051

Solar Absorption

● 50 evacuated tubes (58×1800mm) with reflector mirror inside.
● Sunlight heats the air inside each tube.

Air Flow Inside Collector

The manifold has two inner chambers:
● Cold air enters the cold air chest.
● Hot air is collected in the hot air chest.

Heating Process

● Air passes through a 1500mm glass tube inside each vacuum tube.
● The air is heated quickly by solar energy.

Air Circulation

● A 90W air boost pump pushes the hot air to the room / greenhouse / drying room.

Control System

● A simple controller panel starts the pump and shows temperature.

Result:

Clean, free, and stable hot air for buildings, farms, and drying systems — no fuel, no pollution.

2. Solar Hot Air Heating Collectors Overview


Model	Tube Specification			Absorb er Area	Package Volume	Weight	Container Loading(sets)
	Diameter	Length	Pieces	(M2)	(M3)	(Kgs)	20’GP/40’HQ
AIR-50	58mm	1800mm	50	6.65	0.71	160	40	96

3. Solar Hot Air Heating Collectors Specification

Solar Hot Air Heating Collectors Technical Parameters
1	Model	【AIR-50】
2	Output Power	【300W】
3	Output Temperature	【50~205℃】
4	Output Volume	【200M3/Hour】
5	Pump Power	【90W】
6	Absorb er Area	【6.65 m2】
7	Manifold Plumbing Connections	【1 1/2’’ or customize】
8	Inner Manifold Material	Food-grade stainless steel SUS304-2B,0.4mm
9	Outer Shell Material of Manifold	Color painted steel/stainless steel/aluminum alloy
10	Frame	Zinc-coated galvanized steel,1.5mm,30° stand frame
11	Insulation Layer	High-density polyurethanefoamed
12	Tube Dimension:	581800mm 50 tubes（25+25),three target
13	Tube to Tube Distance	75mm
14	Tube Structure	All-glass double deck co-axial structure
15	Coating Material	【CU/SS-ALN(H)SS-ALN(L)/ALN】
16	Sediment Method	Tri-Element Magnetron Sputtering Plating
17	Absorb Ratio	> 96% (AM 1.5)
18	Thermal Emissivity	≤ 6% / (80°C)
19	Hailstone Resistance	Diameters of less than 25mm (1 inch)
20	Life Span	Approximate to 15~25 years

4.Solar Hot Air Heating CollectorsApplication:

Food Drying – Affordable & Durable Solution

● Ideal for drying agricultural products: fruits, herbs, tobacco, pickled foods, tea, grains, etc.
● Provides stable hot air at 50–70°C under normal sunlight.
● Helps keep food hygienic and moisture-free.

Heating for Small Buildings

● In East China, 1 set of 50-tube solar air collector can heat a 20m² regular house.
● Provides daytime heating for classrooms, homes, workshops, and offices.
● Clean heating with zero fuel cost.

Winter Warming Support

● Excellent for day-time heating of children’s classrooms or elderly homes.
● Improves comfort while reducing coal or electricity use.

Drying & Ventilation Support

● Prevents humidity and mold.
● Useful for storage rooms, greenhouses, chicken farms, pig farms, etc.
● Continuous warm air enhances ventilation and hygiene.

5. FAQs – Solar Hot Air Heating Collectors

1. What are Solar Hot Air Heating Collectors and how do they work?

Solar Hot Air Heating Collectors use evacuated tubes to capture solar energy and heat air directly. Cold air enters the manifold, passes through glass tubes inside each evacuated tube, and is heated by sunlight. A small pump then delivers the warm air into the room, drying system, or greenhouse.

2. How much area can one Solar Hot Air Heating Collector heat?

One 50-tube system (Model AIR-50) can heat around 20m² under normal sunlight. The average hot air output is 50–70°C, depending on the weather and installation angle.

3. Does the solar air heater work in winter or cloudy conditions?

Yes. The evacuated tube structure enables heat absorption even during low sunlight. In cloudy weather, the system still produces warm air, and it can be paired with traditional heaters as a backup for extreme cold regions.

4. What maintenance is required for Solar Hot Air Heating Collectors?

A solar air heater requires very low maintenance. The evacuated tubes are self-cleaning during rain, and routine inspection every 6–12 months is recommended. Simply check:

● Air pump condition
● Manifold air inlet/outlet
● Controller settings

No need for fuel, filters, or expensive spare parts.

5. Can the solar air heater be used for commercial drying systems?

Yes. Solar Hot Air Heating Collectors can be connected in series or parallel for larger drying capacity.
They are widely used for commercial food drying, herbal drying, tobacco curing, agricultural products preservation, and greenhouse heating. Multiple units can operate together to meet industrial demands.