Harsh Bardhan

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...

The use of Carbon dioxide (R744) as a refrigerant declined for a number of reasons, including changes in technology and the introduction of fluorocarbon refrigerants, which were seen as ‘safety refrigerants’. Properties A) Carbon dioxide has an ozone depletion potential (OPD) of zero and a global warming      potential (GWP) of 1. B) It is generally regarded as a cheap and easily available refrigerant, and many regard      it as an ideal refrigerant. C) Carbon dioxide is non-toxic. It has low toxicity and is non-flammable. D) Carbon dioxide is colorless, odorless and is also heavier than air.If enough carbon      dioxide builds up in an enclosed space it will begin to displace oxygen and can cause      asphyxiation in anyone present within the space. As carbon dioxide is colorless and      odorless, a person in the space will not be able to tell unless proper detectors and ...

Most of the refrigeration and air conditioning equipments in the world today uses fluorocarbon refrigerants to facilitate the heat transfer process. Fluorocarbon refrigerants are synthetic chemicals which causes a high global warming potential, and are a greater threat to the ozone layer as well if released to the atmosphere. There are alternatives to these HFC's that can help to mitigate some of the environmental risks.These are called ‘natural’ refrigerants because the substances also occur in nature, these alternatives are:    1) Ammonia,                                                   2) Carbon Di Oxide    3) Hydrocarbons    Ammonia (R717)    Ammonia is a naturally-occurring substance t...

EPS often called as Thermocol is designed keeping in mind the excellent thermal insulation and low cost.When assembled inside the window air conditioner it gives an excellent mechanical fastening to the partition plate and evaporator.Usually the density of the designed components is kept at 30 kg/cu.m and the granular size is 5 mm.