TR CALCULATION

What is TR?

Yes What Is TR?

what wattage are the lights

what is the power rating of the computers

and the xerox machine

what type are humans man woman each produces different heat out puts

other wise the question sounds easy

I will speak up for the OP - Tons of Refrigeration

I'll pass.

WHAT IS TR?

WHAT IS TR?

WHAT IS TR?

WHAT IS TR?

Room Volume = 20 x 20 x 10 = 4000 cubic feet

Base TR for empty room, assuming it is well insulated = 4000 / 1000 = 4 TR

3 tube lights = 3 x 40 = 120 watts

3 computer system = 3 x 200 x 0.8 = 480 watts

One Xerox Machine = 1 x 250 = 250 watts

Total electrical load = 120 + 480 + 250 = 850 watts

Derating by 40% since all may not be loaded all time, 850 x .6 = 510 watts

Following thumb rule, 500 watts = .25 TR

3 humans = 3 x 800 = 2400 / 3600 = .6TR

Hence total TR is 4 + 0.25 + 0.6 = 4.85 TR

But this is assuming the fact that the room is needed at 12°C or less using a conventional split AC system.

With further derating, install one 2 or 2.5 TR split AC system which consumes, on full load, 1.1 to 1.375 units of power per hour

leave a tag on this for further discussion

why are you using 0.8 in the heat dissipated by computer system ,can you please help me

0.8 is the lagging power factor value that has been considered. 200 VA represents APPARENT power and 200 x 0.8 = 160 WATTS represent REAL POWER to which we have to design the system.

www.maintenancecircle.com

Check this URL: http://www.air-conditioner-selection.com/air-conditioner-sizing.html#sfm

Also remember, 1 TR is equal to 3000 Kilocaries/Hour or 12000BTU/Hour

One TR is defined as amount of heat that needs to be extracted from one ton (one thousand kilograms) of water to completely turn it into ice. Stated otherwise, it also means amount of heat required to melt one ton of ice to complete water.

Heat sources to be considered include:

1. Transfer of heat through walls, floor, and ceiling. (Equals exterior temperature plus solar effect minus interior temperature; divided by insulation value (R) of respective partition.)

2. Infiltration of air, either through doors, windows, cracks, or ventilation. There are various formulas and estimation guides for this.

3. Heat sources in the room, such as electrical appliances and persons.

One of the U.S. evaporator coil manufacturers, Krack, has a useful manual on load estimation. Another good source is the Carrier Handbook of Air Conditioning System Design.