Solar Solution four: Close loop commercial solar hot water system

Close loop commercial solar hot water system is working under pressurized situation. The installation will be much easier than non-pressurized. We need pay may attention in pressure balance ( expansion tank needed), safety equipment( safety valve, pressure gauge and so on) and system heating without block(air vent needed).

The system usually complete following device:

Pressurized tank

Pressurized solar collector: flat panel solar collector and vacuum type solar collector

Controller system (pressurized use type)

 

This closed loop solar collector hot water system is composed by pressurized solar collector 、pipeline、circulation pump、controller system. Tank usually design with coil heat exchange for heat exchange, if the tank without insider heat exchanger, the system will install heat exchange outside tank for heat exchange purpose.

And heat exchange media will be always anti-frozen fluid.

Its main feature:

Takes less installation area

Easy for achieve the multi-function control

Easy installation and high effeciency

System process as below

a).Controller system display tank water and collector temperature

b).The water supply directly from water source.

c).Temperature difference control .Setting the tank and collector temperature difference as ΔT, when temperature more than ΔT,the circulation works to push the collector hot water to exchange the tank water .While the temperature drop down under ΔT, the circulation pump stops. This way will routine until sun down.

d).Pipeline circulation: In order to supply hot water immediately ,when pipeline temperature lower then setting valve, circulation pump works to exchange the hot water from tank to pipeline.

e).Heating Equipment controller: there will be backup heating equipment, when there is no sun energy or lower solar energy, the heating equipment works to heating the water tank until reaching the setting temperature.

f).Anti-frozen circulation: Purpose to protect the collector pipeline. When extreme cold, circulation will circulate the hot water from tank to collector for protection purpose.

As we all know solar energy is not steady, there should be other backup heating energy for helping. It is not common used in China with air source heat pump which also a kind of energy saving energy with COP around 5.

• Solar Solution three : Open loop commercial solar hot water system
• Questions to get Solar Solution