Absorption type refrigerator employing film distillation technology

Abstract

The invention discloses an absorption type refrigeration device adopting the technology of membrane distillation, which comprises a lean solution reservoir, a heat collector, a solution heater, a condenser, a throttle valve, an evaporator, an absorber, a membrane distillation generator and a heat exchanger for membrane distillation solution. The absorption refrigeration device is characterized in that: the hot water from the heat collector heats up the absorbent in the solution heater, and then delivers the absorbent in the solution heater to a tube side of the membrane distillation generator; after diffusing to the shell side through tube walls in the membrane distillation generator, the vapor in the absorbent enters into the condenser for condensation; the condensed vapor enters and absorbs heat in the evaporator after pressure reduction by the throttle valve, thus realizing cooling. The absorption type refrigeration device adopting the technology of membrane distillation can effectively reduce the temperature of the heat source, improve the utilized temperature difference of the hot water generated by the solar energy collector and in the generator, enlarge the scope of air emission of pair of working substances and reduce the cooling water consumption of the generator so as to further improve the performance coefficients of the system.

Description

technical field [0001] The invention belongs to the technical field of low-grade energy utilization and refrigeration and air conditioning, and relates to an absorption refrigeration device, in particular to an absorption refrigeration device using membrane distillation technology. Background technique [0002] With the deepening of people's awareness of energy saving and environmental protection, the development of new energy and renewable energy has become the basic choice of many developed and developing countries' energy development strategies in the 21st century, such as solar energy, geothermal energy, wind energy, etc. 1st Five-Year Energy Conservation Plan. An important feature of renewable energy is low density and low grade. Taking solar energy as an example, although theoretically certain technical means (such as the use of concentrating heat collectors) can obtain heat at a high enough temperature, or use photovoltaic power generation The method converts solar e...

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Problems solved by technology

[0006] 1) Although the double-effect absorption cycle and above double-effect absorption cycle has achieved good results in the case of burning mineral fuels, and its thermal efficiency is high, it also requires high heat source temperature. The high-temperature heat source of a typical double-effect absorption cycle The temperature is above 120°C, which has exceeded the heat collection temperature of ordinary solar collectors. Special collectors must be used to meet the requirements, and there are many components and high prices. From the current domestic and foreign applications, there are few Practical reports;

[0007] 2) The temperature of the single-effect absorption cycle should not be too low. The best working temperature is 80-100°C. The main disadvantage is that the temperature difference between the inlet and outlet of the heat source should not be too large, generally at or below 10°C (mostly 5 °C)

The temperature of the generator in the single-effect cycle is completely determined by the cooling capacity of the condenser. If the temperature of the external cooling water is low, the pressure of the generator will decrease accordingly, and the temperature of the generator can also be reduced. At the same time, the temperature difference between the inlet and outlet of the solution in the generator can also be increased, but The cooling capacity is completely determined by the environment and cannot be adjusted artificially

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