China Power To Go INC

Compact Solar Water Heaters

Compact solar water heater is a kind of solar water heating system that solar collector and storage are connected together with the cylinder storage on the top and collector panel on the bottom. There is no need of pump to push the fluid and no need of pipeline between tcollector and storage. It is a simple and safe solution to get heat power from the sun.

Compact solar water heaters(HM series)

Compact solar water heaters(HDR series)

Description:The HM Series solar water heaters relies on the natural circulation of water between the collector and the tank or heat exchanger. As water in the vacuum tubes is heated it rises naturally into the tank, while cooler water in the tank flows down to the bottom of the vacuum tubes, causing circulation throughout the system.

Compact Solar Water Heater (HMseries) Compact Solar Water Heater (HMseries) relies on warm water rising, aphenomenon known as natural convection, to circulate water through the collectors and to the tank. In this type of installation, the tank must be located above the collector. As water in the collector heats, it becomes lighter and naturally rises into the tank above. Meanwhile, cooler water in the tank flows downwards into the collector, thus causing circulation throughout the system. These systems are reliable and relatively inexpensive but require careful planning during installation because the water tanks are heavy.

Compact Solar Water Heater (HM series) move household water or a heat-transfer fluid through the system without pumps. This kind of passive systems have the advantage that electricity outage and electric pump breakdown are not issues. This makes passive systems generally more reliable, easier to maintain, and possibly longer lasting than active systems. Passive systems are often less expensive than active systems, but are also generally less efficient due to slower water flow rates through the system.

Features:

Cheap but reliable solution, Simple structure, Easy installation
High efficiency with daily average efficiency higher than 50%
Withstands water pressure no more than 0.1MPa
Operation without any power supply
Could be installed using parallel and/or series connections
Auxiliary electric booster is optional.1500W 3000W
hot water can be used directly, or can be used as a pre-heat.

Specification

Model	HM-14TT18	HM-16TT18	HM—16TT21	HM—18TT21	HM—20TT21	HM—24TT21	HM—28TT21	HM—36TT21
Volume of tank	130L	150L	170L	195L	215L	260L	300L	385L
Length of Tube	1800mm				2100mm
Inner/Outer Diameter of Tube	φ47mm/φ58mm
Numbers of Tube	14	16	16	18	20	24	28	36
Collecting Area	1.82m2	2.09m2	2.50m2	2.81m2	3.13m2	3.77m2	4.40m2	5.67m2
Outer shell of tank	Galvanized steel Sheet（Basic material：Q215），Surface plastic painting
Outer shell of tank	Aluminum，electrophoresis treating
Insulating layer	Foaming polyurethane,Thickness：60mm-70mmThermal transfer rate：0.022W/m.K
Inner tank	Stainless steal（SUS304） components C：≤0.07%Cr:17.00～19.00 % Ni: 8.00～10.00 %Thickness:0.6mm
Sealing rubber	110 Methylsilicone Rubber with Vinyl
Dustproof rubber	EPDM
Evacuated tube	absorptance：≥94%emittance：≤6%
Stand	Galvanized steel Sheet （basic material：Q215），surface plastic painting
Stand	Aluminum board，surface treatment
Angle of Stand	33oand 50ofor flat roof,45ofor tilted roof
Reflector	aluminum（320G） component：Al 99.85%surface oxidation
Tailstock	ABS plastic material
Daily Efficiency	>50%
Heat Loss Coefficient	10W/m2·K
Optional Electric Booster	1500w/3000w

Typical installation configuration:

Here is the simplest of installation configurations for the HM series Solar water heaters. The tank is low pressure, open vented. The tank is manually filled by opening a tap in the house. Once the tank is full water runs out through an overflow pipe which is fed back down into the house. When water starts flowing out the tank is full. When using water the tank gradually drains until it is empty. Once accustomed to the method of operation, the user knows how much water is left in the tank and can fill it up at the appropriate time.

This is the simplest of installation configurations for the thermosyphon tubular solar water heater. The tank is low pressure, open vented. The tank is manually filled by opening a tap in the house. Once the tank is full water runs out through an overflow pipe which is fed back down into the house. When water starts flowing out the tank is full. When using water the tank gradually drains until it is empty. Once accustomed to the method of operation, the user knows how much water is left in the tank and can fill it up at the appropriate time.

Depending on hot water usage pattern and weather conditions, the hot water can be used directly for showering, or can be used as a pre-heat, feeding the inlet of an instant or tank water heater.

2.2 Available options for thermosyphon tubular water heaters

Automatic filling
- automatic filling valve and control valve
- automatic filling float box
- controller
Electrical heat booster
- 1200 W
- 1500 W

2.3 Solutions for automatic filling

In order to automate the delivery of cold water to the collector, there are three solutions that may be used.

solution A:

solution B：

solution C:

Compact Solar Water Heater (HDR series)

Description:

HDR series solar water heaters are all-glass evacuated solar domestic water systems combined with heat pipes inside the glass tube. The selective coating on the inner tube converts solar energy into heat energy and transfers to the heat pipe by an aluminum fin. The liquid in the heat pipe changes into vapour which rises to the condenser. The heat conducts the water inside the tank and the vapour becomes liquid, returning to the base of the heat pipe. This continuous circulation transfers heat from the heat pipe to the cold water in the tank as long as sun is heating the collectors. Hot water can be obtained by injecting cold water from the bottom of the tank

Features:
Some advantages compared with HM series

The system will still operate in the event of occasional tube breakages;
Can operate with water pressure up to 0.4MPa;
No additional device for automatic filling water to the tank;
More pressure, more comfortable.

Specification

Model	HDR-18TT21/φ58		HDR-20TT21/φ58		HDR-24TT21/φ58	HDR-28TT21/φ58
Volume of Storage Tank	210L		230L		270L	310L
Numbers of Tube	18		20		24	28
Length of Tube	2100mm		2100mm		2100mm	2100mm
Inner/Outer Diameter of Tube	φ47mm/φ58mm		φ47mm/φ58mm		φ47mm/φ58mm	φ47mm/φ58mm
Outer Shell of Tank	Galvanized steel Sheet，Surface plastic painting Thickness: 0.6mm
Stand	Galvanized steel Sheet，Surface plastic painting Thickness: 2mm
Insulating Layer	Foaming polyurethane,Thickness：67.5mm
Inner Tank	316L Stainless steelThickness: 1.5mmArgon welding technology
End Cover	316L Stainless steelThickness: 2mm
Evacuated tube	Absorptance：≥94%Emittance：≤6%
Working Pressure	Normal working pressure: 3-6kgTest pressure: 10kg
Reflector	aluminum（320G） component：Al 99.85%surface oxidation
Tailstock	ABS plastic material
Collecting Area	2.81m2	3.13m2		3.77m2		4.40m2
Angle of Stand	33oand 50ofor flat roof, 45ofor tilted roof
Heat Loss Coefficient	W/m3·K
Dailey Efficiency	>50%
Inlet/Outlet Connections	G 1/2
Optional Electric Booster	1500W/3000W
Power supply	170-240V
Temperature sensor	0-99℃Accuracy of temperature:2℃