Harsh Bardhan

Watch the video ACREX - 2013 on YouTube I was in the ACREX-2013 exhibition held at Bombay Exhibition Center on 7th,8th & 9th in Mumbai. Watch the video above to get a feel.

The rules of thumb article below is a part in series of lecturers of Prithvi Datta (UK) ] he used at Colleges of HE & FE in United Kingdom with practical experimentation for promoting innovation and modification in R&HVAC Engineering.Thousands of Trainers of Trainees and students of courses from Apprentice Mechanic to Ph.D. had appreciated the series to master skills for Experimental Studies and Techniques. Part 1 During my professional duties as Lecturer in R&AC in a Humberside college of HE&FE we were using R12, 22 or 502 for following use of Rule of Thumbs. I tried to use R410A for the following example using limited data available to me at that moment.Selected R410 for this application with COP of 8.33 is good example. why some refrigerant cannot be used without waste of energy and operational and capital losses. Phase & State of Refrigerant at important specific points within as simple Refrigeration Cycle working in UK with R410A...

It is not only HVAC industry that should support energy conservation brigade but the trend in the whole world in any industry is such.There should be a strong movement in this direction.   Go Green - Environment friendly and the buzz word being "Dedicated to Eco Friendly Environment". What rubbish !Ask ACREX-2013 organisers and visit the stalls of the companies you will find the vast difference between what is being propagated on the paper and what is the ground reality.   I was in ACREX-2013 exhibition held at Bombay Exhibition Center on 7th,8th & 9th in Mumbai. I have attached the theme photo of the ACREX-2013 bill board that says "Dedicated to Eco Friendly Environment". The reality is far from the spirit of the theme.   The reasons are below:   1) I visited the stalls of the most big compressor manufacturers for the compressor requirement on "Natural Refrigerant" and couldn't find even a single manufacturer who could suppl...

  Frazer Goodman has developed the next generation Split Air Conditioner that runs on Solar Power and consumes only 0.34 Watts.

I have been approached by lot of people to teach them system design for the HVAC&R product development and I thought it fit for them to start from basics as without  solid foundation there can be no building.So I thought of compiling the basic formulae first and then go for the system design aspects.It has taken me considerable time to compile these formulae. I would like to thank Ms. Ashima Saxena for helping me in editing the list of the compilation. Thermodynamic Design Formulae Sr. No. EQUATION FORMULAE 1 F = m a Newton's law of motion 2 P = F / A Pressure 3 ρ = m / V Density 4 W = F d Work 5 PE = m g H Potential energy 6 KE = ½ m V 2 Kinetic energy 7 Q = m Cp( t 2 - t 1 ) Sensible heat 8 Q = m ( h 2 - h 1 ) Total heat 9 W - Q = dE 1 st law of thermodynamics 10 C pa = 1.005 kJ/kgK Heat capacity of dry air 11 C pw = 4.193 kJ/kgK Heat capacity of water 12 C pv = 1.884 kJ/kgK Heat capaci...

Hydrocarbons are refrigerants that can be used as an alternative to fluorocarbon refrigerants in some refrigeration and air conditioning applications. The term ‘Hydrocarbon’ encompasses following:  A) Ethane (R170)  B) Propane(R290)  C) Butane (R600)  D) Isobutane (R600a)  E) Propylene (R1270) Properties 1) Hydrocarbons are highly flammable. 2) They have a low toxicity. 3) Hydrocarbon refrigerants are fully compatible with nearly all lubricants commonly used     in refrigeration and air conditioning systems. One major exception to this rule is     lubricants containing silicone and silicate. Comparison with HCFC 1) HVAC professionals have made a comparative study on the performance of hydrocarbon     refrigerants R290, R600a and R1270 with that of HCFC refrigerant R22 and found that in     comparison to R22, hydrocarbon refrigerants have similar or better ability. 2) An experiment o...