Six years ago, in order to introduce solar heating, I used to run several literary public accounts, literary articles I am not good at writing, fortunately, at that time there are many people who love literary creation, I will take his (her) articles to send, and then hang advertisements under the article. That is at that time, I know old Meng, forget which article he read, only remember he said he used to do ground maintenance technician in a department of the Air Force, is also hVAC enthusiasts, engaged in stainless steel processing after the transfer of industry, to my hair advertising is particularly interested in, left the contact information.
Old meng asked me to do solar heating success? I frankly not too successful, vacuum tube installed many, the most afraid of explosion tube, a blast tube, the whole system will be paralyzed, and the loss of heat is far more valuable than a vacuum tube! The existing vacuum tube collector can not be emptied, the heat loss at night can not be ignored; The exhaust is at the top of the header, and the heat dissipation at night is not small (automatic exhaust valve can not be installed in the undercooled area, but the atmospheric connection pipe); The system can not bear pressure, circulating pump power consumption is not small; The water in the vacuum tube circulates by natural convection and the heat transfer effect is not good. There is also the problem of overheating in non-heating season is not very good to solve. The heat pipe collector can bear pressure, but the cost is too high for ordinary people to afford, and the heat collection efficiency of the heat pipe collector is low, and the ordinary vacuum tube collector can not be compared.
Lao Meng asked me how I came up with solar heating. I said that this was the general trend of the future, burning coal is not clean, too troublesome, electricity, gas can not afford to use. He asked me if I wanted to cooperate to develop a collector to solve the problems in the market. I admitted that I didn’t have that ability. I could only ask questions, and he had to figure out how to solve them. Lao Meng said we work together to find a way, I said yes.
After several years of exploration and practice, the vacuum pressure-bearing full-channel solar collector is finally coming out. Then, compared with the ordinary vacuum tube collector, what are its advantages and disadvantages?
First, the disadvantages: complex process, high cost.
As a pressurized solar collector, the cost of vacuum pressurized full-channel solar collector is about 10~15% higher than that of ordinary vacuum tube solar collector, but it is about 30% lower than that of other heat pipe pressurized solar collectors in the market.
The inner bladder of the vacuum bearing full-channel solar collector box is double layer, one layer for hot water and the other for cold water. In the vacuum tube, there are also two layers of stainless steel pipe, the inner pipe to cold water, the outer pipe to hot water.
Advantage 1: pressure operation is safer, can be directly installed with wall furnace, air.
The inner liner of vacuum pressure-bearing full-channel solar collector is made of 304 stainless steel with a wall thickness of 0.7mm (the inner liner of vacuum tube solar collector on the market is mostly made of stainless steel tube with a wall thickness of 0.35mm). It can bear a pressure of 2kg. When it is installed with wall-hanging furnace and air energy, there is no need to add equipment.
Advantage two: the exhaust port is opened at the bottom of the header, so there is no need to worry about the collector cooling caused by cold air entering at night.
Advantage three: the vacuum tube is filled with only a small amount of water or no water, reducing the heat loss of the system in non-working state.
The amount of water in the vacuum tube depends on the height difference between the tail box and the header. The installation height of the tail box of the vacuum bearing full-channel solar collector can be higher than that of the header. At this time, there is only a small amount of water vapor in the vacuum tube and the cavity of the stainless steel tube.
Advantage four: daylighting area is large.
The lighting area of vacuum pressure-bearing full-channel collector is 1.3 times that of ordinary vacuum tube collector.
Advantage five: good heat preservation of the header.
The coupling box adopts 85mm polyurethane integral foam, better insulation effect.
Advantage six: fast heat transfer speed.
Vacuum pressurized full-channel solar collector adopts forced circulation, while the heat transfer in vacuum tube of ordinary vacuum tube collector depends on natural convection.
Advantage seven: can produce steam directly.
Vacuum pressure full channel solar collector can produce hot water for heating and domestic hot water, also can produce steam water for agricultural drying and other purposes.
Advantage eight: anti air bask.
Vacuum pressure-bearing solar collectors can resist air sunlight in non-heating season, and do not cover sunshade net, which reduces the user’s later operating cost.
Advantage nine: water vapor recovery, less heat loss.
The exhaust valve of the vacuum bearing full-channel solar collector is also at the top of the header, but its exhaust hole is at the bottom of the header. The hot steam returns to the header and is discharged from the exhaust hole at the bottom of the header through water heat absorption.
Advantage ten: light control probe, automatic empties.
The vacuum pressure-bearing full-channel solar collector is equipped with a light-controlled probe, which can automatically empty at night or rainy weather to reduce the heat loss of the system.
Advantages eleven: pressure system, the required configuration of the circulating pump power is small, low cost, low operating costs.
This new type of solar collector, in addition to the slightly higher cost, many advantages, its advent, to solve the existing market solar collector there are many defects, in the clean heating market, will occupy a place.