China currently uses solar collectors can be simply divided into two categories : flat-plate solar collector and vacuum tubes (including all glass vacuum tube and heat pipe vacuum tube ) type solar collector . Flat solar collector applications earlier , with the lighting area, the structure is simple, safe and reliable operation , low investment costs , easy maintenance , long life , has been used in domestic hot water supply , heating and air conditioning engineering , engineering Dehumidification, warm water aquaculture and other fields. But the low heat flux , refrigerant temperature is low . As the flat-plate collectors do not have the condenser function, and its working temperature is limited to below 100 ℃ .
All-glass vacuum tube
solar collector is simple , mature and reliable technology , glass materials, accessible, cost- use year in and year as the volume , with transmission and absorption rate , heat-reflective low convection heat loss of small and long hours throughout the year And other excellent features , all-glass vacuum tube solar water heater solar water heater China's total production accounted for 70 %% . The drawback is that glass is fragile, transportation and maintenance is relatively higher, and can not be confined , at present prices are still high, the engineering application of a longer payback period .
Heat pipe vacuum tube collector heat capacity of small , hot start fast , freezing ability, Japanese collectors and high temperature. As the manufacturing process complexity , the current high prices .
In solar heating and air conditioning engineering, refrigeration equipment, from the efficiency point of view, hope collector water temperature the higher the better . Flat
solar collector with the collector water temperature, the collector efficiency decreases rapidly at refrigeration engineering advantage is not obvious . As the manufacturing costs down year by year , all-glass vacuum tube and heat pipe more suitable for both heating and cooling needs of another project .
The current application of solar refrigeration equipment more main hot water absorption chillers and solar absorption chiller, hot water absorption chiller refrigeration cycle as the difference , can be divided into single effect , double effect , three-way and single Efficiency levels consistent with type units .
