Why air curtain need in your business premise

Air Curtain Need

Controlling indoor temperatures, saving energy and keeping debris and pests outdoors is a major challenge you can experience if you are a home or business owner then air curtain need for you. It is even worse if you live in a heavy traffic area. Air curtains, also called air doors are devices designed to deliver constant airflow across an opening i.e. window, home, business or garage door.

They are common in many industries and have been installed above entry doors in restaurants, offices, and shops. Air curtains are tall and can cover 6 meters doors. Installing an air curtain in your business is the best move you can make in mitigating a vast range of concerns. Here are some of the benefits and why your business an air curtain need.

  • It reduces employee absenteeism. An air curtain releases warm air right from bottom to top keeping the temperatures of your business premise in control. It eliminates exchange of warm and cold air, hence, preventing draft. During the summer season, it promotes cool air in your business building and keeps hot air out thus maintaining a comfortable working environment. It motivates employees, hence, reducing instances of absenteeism.
  • Promotes a clean and healthy environment by restricting entry of flying insects and other pollutants such as pollen, dust, and fumes from traffic. Therefore, they are ideal in case you run a restaurant business. It improves employee and customer comfort by eliminating the uncomfortable sensations of draught.
  • It saves energy and significantly cuts down your heating and air conditioning bills. Air curtains create an invisible door that prevents the inflow of external air and restricts the outflow of indoor air. Consequently, this high-tech significantly saves you from incurring unnecessary heating bills. It also promotes low-velocity air that is desirable in case you ran a departmental store or supermarket. There are two types of air curtains i.e. recirculating and non-recirculating air curtains are equipped with dual grill system i.e. receiving and discharge grills. Discharge grill releases air which is collected by the receiving grill. The air is filtered and circulated back to the discharge grill to form a continuous flow. On the other hand, non-recirculating air curtains do not filter air instead it is released into the fan housing. Therefore, there is no constant flow of air. The systems have high velocities and do not need any maintenance cost. They are also very efficient.
  • It promotes the flow of traffic into your business premise. In case it is inconvenient to install a well-sealed door, you can consider installing air curtains to promote safe and faster inflow of traffic into your business premise while keeping indoor temperatures in control. The Open door effect’ substantially improves inflow of customers.

Air curtains also allow maximum entry of natural light. This reduces instances of collisions and prevents ice from forming on the floors of your business premise. Additionally, in the case of emergencies, it makes it easy to evacuate a building. If you are planning to install air curtains in your business premise, then consider hiring a professional to do it.

Air Door – A Great Energy Saver

Most commercial, industrial and residential establishments these days use an air door for a major reason – cutting their monthly electric consumption. Remarkably this piece of equipment has proven such relief in the payment of electricity bills to those who have been using it.

If you do not quite understand how the saving of energy happens, let us first have an overview of how it works. This device, which is commonly placed at the entrance of most structures, functions in the concept of directing an invisible stream of cooled or heated air downwards. This same concept makes it very effective in trapping the cooled or heated air inside the room or building.

An air door works hand in hand with an air conditioner which may be used as a cooler or a heater. Once a place is being cooled or heated, the internal air is being kept inside by this piece of technology while the external air is being prevented from coming in. Thus, it reduces the energy an air conditioner has to use up in expelling cooled or heated air. Moreover, it reduces the heat transfer between two spaces especially spaces that are being cooled and are impossible to be separated by a real door in place.

Since more and more establishment owners have seen the energy saver quality of this device, air door manufacturers have mass-produced it in different sizes. There are sizes that will suffice for the cooling or heating needs of a small room or a spacious warehouse.

Designed to provide a steady gush of cooled or heated air, they are very valuable during cold and warm months of the year. During winter, they help lighten the load of heating systems. They trim the loss of heated air which flows out of open entrances. Come summertime they reduce the intensive use of air coolers as they prevent the loss of cool air. More than that they function as a repellent to dirt, dust, and fumes which affects the conditioning – cooling or heating – of air in a certain place.

In connection with this, the high technology that air curtains possess creates an invisible wall of air. This air wall serves as a barrier that divides two environments of different temperatures even with the absence of a door. Hence, air from outside that may contain the above-mentioned pollutants is blocked and the conditioned air inside a place remains clean and intact. Sound like the function of an air purifier too, right?

Next, to be an air purifier, it also functions as an air knife. This is perfect for any spot cooling needs. Instead of using additional pieces of equipment for these, an air door can do this single-handedly. Again, much energy and money are saved.
Besides saving energy, a door air curtain also saves time – time spent in combating the different flying insects that may infest any place. You do not have to worry anymore about the health hazards you might catch from these filthy creatures as the air wall air curtains produce shall force their exit.


Cost of Opening a Door =7 

Energy Calculation

E = m C ∆T

m : Mass of Air

C : Specific heat of Air at given Temperature

∆T : Temperature Difference

m = Density X Volume

Density of Air at 40˚C = 1.127 Kg/cu. meter

C = Specific Heat = 1.005 KJ / (Kg ˚C)

∆T = Temperature Difference = 15˚C

(assuming outside temperature is 40˚C and inside is 25˚C)

Volume = Area X Velocity of Air from Door X Time of Opening

(Say :       Door Size = 8ft X 4 ft

                Velocity = 1 m/s = 200 fpm

                Time of Opening = 1 min

                Volume = 32 X 200 X 1 = 6400 cu. ft. = 181.22 cu. meter)

m = Density X Volume

(from Above             = 1.127 Kg/cu. meter X 181.22 cu. meter

                                = 204 Kgs)

E = m C ∆T

= 204 kgs X 1.005 KJ / (Kg ˚C) X 15˚C

= 3075.3 KJ = 0.85425 KWh

Thus –

India if Per KWH cost of Power is Rs 8.10

Cost of Opening the Door of Size 8ft X 4ft for 1 min is = Rs 6.92

Cost of Running an Air Curtain of 4 ft = 400W (Input Power) for 1 minute = 6 paise

Rate per Kwh X Time X Power Input

8.10 X 1/60 X 0.4 = 5.4 paisa

Net Saving = Rs 6.92 – 0.06 = Rs 6.86

9 things every consultant should know about air curtains

Speed is not the only way to measure Air Curtains:

The output of the air curtain device is measured in terms of the velocity of air. The input power is varied and efforts are made to optimize the performance of the air curtain device.

Static Pressure plays a significant role in the selection of the Air Curtain:
Your selection depends upon the frictional force that occurs when you try to push an object alongside a surface. Static Pressure is the pressure of the fluid on a body when the latter is at rest relative to it.

Air Curtain does not work in all the Wind Conditions:
Like if the air pressure outside is more than that of the pressure inside, then the air curtain won’t work properly.

Air Curtain installation should be generally Installed OUTSIDE:
Air curtains are designed for indoor installations(environment: normal, basic) above or next to the door. Typical installations sites are production and industrial buildings, stores, transport terminals, car services, garages, markets, drying houses, etc.

Air Curtains will not work in a negatively pressurized building:
Air doors work best when the pressure differential between the inside and outside of the building is as close to neutral as possible. Negative pressure, extreme temperature differences, elevators in close proximity, or extreme humidity can reduce the effectiveness of air doors.

Impeller Diameter and RPM play a major role in deciding the flow:

Air Curtains can be used to prevent Cold Air from escaping as in Blast Chillers to Hot Air in Ovens:
Air doors are often used where doors are required to stay open for operational purposes, such as loading docks and vehicle entrances. They help keep outside air, thus reducing infiltration through the opening. The cold draft can be avoided by mixing in warm air heated by the air door. Heated air doors are commonly used when supplemented heat is needed for space, and to reduce the wind chill factor, inside the opening in a colder climate.

Centrifugal Technology works best in non-heated Air Curtains.:

Crossflow technology is generally used in Heated Machines.:

After you “take the package” and leave big corporate, you get to choose what’s next. You can go after another corporate gig, go work for a start-up or a smaller company, retire (heaven forbid) or start consulting.

a). Pricing
Sell value, not hours. Always price a project based on its total value to the client. This has nothing to do with the number of hours spent doing the work. There is a reason senior partners at a law firm are more expensive than associates. When you have a 10-minute discussion with a senior partner, you are getting 30 years of knowledge and experience as well as access to an extensive network of contacts and resources (value). You’re not paying for 10 minutes of time; you’re paying for 30 years of wisdom, and it’s usually well worth the fee.
So sell a project, not its component parts. If you think you can do a project in +/-10 hours, and full-time employees who do this work earn $100/hour for their services, use this information as a guideline – but only as a guideline. Determine the value of your work to your client and price accordingly.

b). How Much to Charge
A young boy walks into a candy store. Everything looks delicious and he is overwhelmed with choice. After a few minutes, he sees a piece of candy he really wants, but he is not sure he can afford it. He gets the proprietor’s attention. Almost afraid to hear the answer, he asks, “Excuse me, sir, how much is this?” The candyman looks quizzically at the kid and responds, “How much you got?” The boy takes a moment to count his change and replies, “Er – 25 cents.” As if surprised, the candyman holds back his smile as he proclaims, “Funny, that’s exactly how much it is.” You now know everything there is to know about pricing a consulting project. The market sets the price.

c). A Proper Statement of Work and Deliverables
In order to profitably price a project, you need to have very succinct deliverables specified in a statement of work (SOW). You also need strict deadlines for your deliverables as well as specific parameters for clients’ response time. If a client’s slow response time pushes you over your deadlines, you cannot be held responsible. This should all be clearly outlined in the SOW in a section entitled “Roles and Responsibilities.” If the project takes you longer than you expected, you’ll know better next time. If it takes less time than you expected, you have room to take on additional work. Both outcomes are excellent.

d). Travel Expenses
If you travel for business, your clients will want to inflict their travel policies on your life. This may work for a while, but it is not sustainable. You may think you can fly Coach transcon with two layovers, do business that afternoon, sleep for six hours, fly back through Dallas, change planes, then work a full day on the West Coast. Don’t. At a certain point, nature will force you to develop a sustainable set of personal travel protocols. Why wait? Do it now. “I only fly during the day. I only fly nonstop. I only fly Business Class or in Premium Economy in an aisle seat.” It doesn’t matter what your protocols are; you just need to have them. Now, as it turns out, clients have travel protocols too. Ignore them. Do not let your clients book your travel (unless you qualify for Business Class or First Class nonstop, obviously). Add a few thousand dollars of reimbursable expenses to your fees. For example, “Client will preapprove and reimburse consultant for out-of-pocket expenses of approximately $X,000 per month.” This can be any number, but it puts you in charge of your own travel, which is key.

e). Negotiation
Never personally negotiate your fee with a client. Never. Ever. Not once. No exceptions. Have your attorney, an admin, your wife, a business affairs person, your housekeeper, a friend, a perfect stranger, anyone but you do it. Never quote a price. Never speak about your rate. Never renegotiate a rate while on a job. Never talk money with a client.
If you’re going to be a consultant, hire someone to negotiate your deals for you. This establishes a very important psychological environment for your engagement. You are the superstar talent. You are above petty things like money. Your job is to help your client accomplish its business goals. You can always be nice. You can always have a positive attitude. You’re “the pro from Dover!”
There is another, very practical reason to have a third party negotiate for you. You are a consultant, not an actor. If you think you are being treated unfairly or that you are being underpaid for your work, you will not be able to hide it. The client who made the deal will not know you think you’re being underpaid because you accepted the deal – but you will know, and your work (and your relationship with your client) will suffer for it. A full-time or part-time business affairs person is a necessary overhead cost for a consultant. Spend the money; it will set you up for success.

f). Administration
Considering all of the technology available, you might not think you need an admin to be an effective consultant. After all, there’s voicemail, email, .pdf files, Dropbox – your whole office can live on your smartphone. While this is absolutely true, spending your time answering perfunctory emails and scheduling calls and meetings is a huge waste of your time.
Hire an admin or a service bureau to act as your admin. You can use voicemail, but have a person return calls immediately and schedule phone calls (as if they were appointments) for you. If you’re busy consulting, you cannot and should not keep your own calendar. You should set aside time for office hours (virtual or actual) at a time when you schedule and return calls. If you can afford it, train or hire an executive admin who can handle correspondence and standard proposals, and SOWs. A great admin is a key to maximizing your time as a consultant.

g). Online Presence
This may be obvious, but the first thing a prospective client is going to do is Google you. Then they will search LinkedIn, Twitter, Facebook, and anything else that comes to mind. Your online presence should match your offline presence. Your mobile-friendly website as well as your social media profiles should all be up to date. It’s table stakes in the consulting game.
There is much, much more to this story. Setting up a consulting practice is as much art as science. It is the subject of countless books and seminars. Hopefully, some of these general guidelines will be helpful. Of course, the best way to become a successful consultant is to start consulting. So go forth unafraid! If you’ve got something they want to buy, you’re going to have no trouble selling it

Centrifugal Fan CFD Analysis for Predicting its Aerodynamics

A centrifugal fan (often referred to as a coop fan) may be a machine used for moving air or different gases because of their straightforward style, centrifugal fans area unit factory-made easier than different kinds of fans that saves time and prices. This makes them a well-liked alternative for air handling applications.

Through their rotating impellers, with either forward- or backward-curved blades, centrifugal fans increase the speed & the volume of an air stream and have superior mechanical properties compared to axial fans, as an example.

Energy potency (reaching up to eighty-four static potency), sturdiness even in corrosive environments, simple maintenance, and suitableness for multiple airflow/pressure combos area units the most blessings that engineers take into account once selecting them for HVAC applications.[1]

How to Predict a Centrifugal Fan’s mechanics Efficiency?

As mentioned higher than, its mechanics is one of every of the simplest blessings of a centrifugal fan. This is often why throughout the planning method, it’s necessary to build to form to create} positive that style engineers make the foremost out of its properties to maximize potency. This is often once procedure fluid dynamics (CFD) simulations acquire play.

CFD is that the technique used for the computerized calculation of fan mechanics quality to accurately predict its performance early within the style stage, analyze numerous CAD models, scale back the quantity of physical prototypes and overpriced testing and optimize the planning for optimum performance.

Sim Scale’s CFD resolution permits fan designers to calculate flow rates, static pressure, total pressure, static efficiency, total potency, peak total potency, forces and moments working on the fans and a lot of, 100% within the browser, giving flexibility, collaboration choices and access to high computing power — up to thirty-two cores —from a standard computer or laptop computer.

CFD Analysis of a Centrifugal Fan style

An example is that this CFD analysis, which was performed on the planning of a centrifugal radial compact fan with a forward-curved vane. this sort of fans area unit is used for natural philosophy cooling applications like thermal management for the picture show, IT, and medium systems.

The goal for the 3D simulation was to predict the fan’s mechanics performance and establish areas for style optimization.

The contours below show a 3D visualization of static pressure, flow rate, and also the mechanic’s forces working on the rotor. The performance curves obtained from this analysis area, unit key indicators for deciding whether or not the planning meets the wants or desires optimization.

Specialty of Air Curtains

These are the 3 Specialty of Air Curtains

1. They create an invisible air barrier that inadvertently stops the flow of air from the outside. Creation of an invisible curtain of air enables us to keep the door wide open.

2. Placement of the product is an important task, just above or beside the entrance ensures no movement of air from outside the area. While not doing the same may result in leakage from both areas.

3. There are other ways to support the temperature in a room but air curtains are an advanced technique which allows people to move between rooms without any hindrance.

In the recent times, many industries do not mind spending large amounts to support a healthy setup. But on the contrary, these curtains are highly inexpensive and efficient at work. The setup is quite overwhelming for many, as these air curtains manage temperature even with the door open by forming a thin air layer across the doors. These curtains can manage both hot and cold air, be it inside or outside the confined area.

The air curtains are selected depending on the following factors:

  • The height of installation of the curtains is measured from the discharge diffuser to the floor, the width of the door etc.
  • The location of the building to decide the level of protection needed against weather conditions.
  • If the building has several doors in the same, different or opposite direction.
  • If the building has several stores connected by escalators.
  • Air Pressure differences between the inside and outside of the building.
  • If the door is always open, automatic, revolving, etc.
  • Characteristics of the ventilation and air conditioning.
  • Availability of voltage and electrical power.
  • Type of business, style, and decoration of the premises.