Skip to main content

Vapor Absorption Heat Transformer

Almost every process evolve heat as a by product which is in between temperatures of 40 -70 degree C. But this heat is not useful and produce green house effect. Even the heat available from solar system also lies between 40 - 70 degree C if we use good solar panels. But its usage is limited. so we need a system which can increase this heat to 110 degree C or more which can be useful in evaporation of water or as heat pump in winters or as water heater with high flow rate.

  The conventional system using electric heat which require high amount of high grade energy to raise the temperature, which again increase the green house effect and also very costly. So to avoid the  usage of high grade energy, vapor absorption system is best alternative. It does not require high grade energy and so its running cost is negligible.

Vapor absorption have mainly five heat exchangers 1) Absorber 2) Generator 3) Condenser 4)Evaporator 5) Solution heat exchanger.



Vapor absorption system(VAS) is different from vapor compression (VCS) system in working. In VCS the condenser is at high pressure but in VAS condenser and generator is at low pressure. In VAS ther are two pumps which raise the pressure of liquid refrigerant(As it is easy to raise the pressure of liquid in comparison with vapor and require negligible energy).

Waste heat from waste heat source is circulated using water as medium in evaporator. In evaporator, water is heated and water vapor is entered in Absorber where LiBr is working as absorber and absorb the water vapor. So high concentration high pressure lithium bromide become low concentrated LiBr-water mixture. This process is exothermic and release an enormous amount of eenrgy which increase the absorber temperature from 70 to 120 degree C.
The low concentration soultion from absorber moves towards the generator through an expansion valve which reduce the pressure of mixture from absorber to generator pressure.
A solution heat exchanger is used in between the absorber and generator to increase the efficiency of system. The low concentrated mixture of LiBr-water is heated in generator, where water is convertyed in vapor and enter in the condneser where as the rest mixture in generator become rich in LiBr and sent back to Absorber for further absorption of water vapor coming from evaporator.

The water vapor in condenser is cooled by ambient air and converted into liquid and this liquid is sent to evaporator thrfough a liquid pump mounted between condenser and evaporator, because it is easy So with the negligible amount of energy needed to run, this system is eco friendly and can be viable option for sustainable development of world.
The waste heat source may be from industry exhaust or from kitchen exhaust.

For More details: 

https://www.linkedin.com/in/navneet-rohilla-367b69109/detail/treasury/education:326899477/?entityUrn=urn%3Ali%3Afs_treasuryMedia%3A(ACoAABtm-L8BI1_RqojA7LDbsJCaZ2A6ESpx7vc%2C51032761

Comments

  1. If we are talikng about heat pumps all heat pumps are used for special purpose. sunstellar provides best < a href="https://sunstellar.in/blogs/air-source-heat-pump/">air source heat pump in India.

    ReplyDelete
  2. Great to know and thanks for support sir

    ReplyDelete

Post a Comment

Popular posts from this blog

Numerical designing (Mathematical modelling) of an air conditioner ( by two methods)

Human do not feel comfort at  high temperatures or extremely low temperatures. The situation of body when it feel comfort with the surrounding conditions like temperature, RH%, air flow etc is called the thermal comfort. This comfort situation is at 27 DBT and 19 WBT.  To provide this thermal comfort condition, Air conditioners are used which supply the air at required temperatures. The schematic of an air conditioner is shown as below: Consider a 1 TR air conditioner with ambient 35 DBT and 24 WBT and indoor design conditions are 27 DBT and 19 WBT . So the inlet air to evaporator is at 27 DBT and 19 WBT. The design conditions are as per below: Outdoor conditions: 35 DBT, 24 WBT Indoor conditions: 27 DBT and 19 WBT Evaporator temperature in: 12 deg C Evaporator temperature out: 15 deg C Condensing temperature: 54 deg C Liquid temperature: 46 deg C (ASHRAE conditions) Now main thing to calculate is required mass flow rate of air (CFM) and air out condi...

Mathematical modelling of an air conditioner using evaporative cooling (without compressor)(COP =10.99)

Air conditioners are used to provide thermal comforts in extremly hot conditions. But these are very high power consuming machines. An attempt is made to make an air conditioner using the both form of evaporative cooling. Evaporative cooling is the most powerful and cheapest cooling technology. When air blow over the water, it gets cool. Water evaporated with blowing air, utilize latent heat from water itself thus reducing overall temperature of air and water. For details in evaporative cooling, Please click on below link: http://athermocreation.blogspot.in/2017/10/evaporative-cooling.html As we know to increase the temperature of one liter of water by one degree, Sensible Heat required is 4.187 kJ. But to evaporate one kg of water, latent heat required is 2250 kJ which is almost 550 times the sensible heat. So to lower the temperature of water only a small portion of water evaporation required. Evaporative technology is of two types: 1. Direct Evaproative technology ...

Numerical design (Mathematical modelling) of a compressor for refrigeration and air conditioning(cylinder volume calculation)

Compressor is the heart of any refrigerating equipment as it pump the refrigerant in to the all components like our heart supply the blood throughout the body parts. Compressor decide the cooling capacity and power consumption for refrigerating machine. Its main work is to take the refrigerant from suction pipe at very low pressure(temperature as well) and compress it to a very high pressure (discharge pressure). As we all know that refrigerant condense in condenser at constant temperature (for zeotropic blends it vary), and that temperature is corresponding to the discharge pressure of refrigerant. Discharge pressure of refrigerant is such that its corresponding temperature should be higher than the ambient temperature only than refrigerant will condense in to liquid if the discharge saturation temperature(corresponding to discharge pressure) is lower than the ambient temperature, than refrigerant will not condense. All compressors can be described on their application(use) as...