Heat Recovery with Ventilation

Heat recovery with ventilation

Abstract:

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Keywords: ventilation; heat recovery

I. Introduction:

In the Kurdistan Region of Iraq, there is a shortage of ventilation in educational as well as other closed spaces which might affect the performance of students or employees of that certain organization.

Therefore, it is important to assess the current ventilation situation in those closed spaces. Ventilation is a term applied to changing the air in a workplace or living place. In any space occupied by people, the breathing of the air reduces the oxygen content. Activities in the space may add some pollutants to the environment. The most economical way to maintain the health and comfort conditions of the space is by replacing the air. This is done by bringing in outside air to ventilation the space. Whenever air is exhausted from a space, such as a room in a home or factory building, air must be brought into the room to replace the air exhausted. If the outdoor temperature is either too high or too low for comfort. The air brought into the area to replace exhausted air must be conditioned:

1.Either heated or cooled.

2.Cleaned.

Replaced air is conditioned to provide a comfortable room environment. This conditioned air brought into the room is called (makeup air).[1]

For ventilation heat recovery system can be used for saving the energy,

Heat recovery ventilation, also known as HRV, mechanical ventilation heat recovery, or MVHR,

is an energy recovery ventilation system using equipment known as a heat recovery ventilator, heat exchanger, air exchanger, or air-to-air heat exchanger which employs a counter-flow heat exchanger (counter current heat exchange) between the inbound and outbound air flow. HRV provides fresh air and improved climate control, while also saving energy by reducing heating (and cooling) requirements.

Venmar heat Recovery ventilator

*Rovides fresh air to all areas of your home

*Removes pollutants & moisture from kitchen, bathrooms and laundey

*filters incoming air

*shift temperature around building

*Overcomes negative pressure problems

*Recovers Energy (up to %80)

Basic ventilation requirements

As noted before, air is a mixture of gases. Normally air contains about 21 percent oxygen. A human system requires that a certain oxygen content be contained in the air:

1. To maintain life.
2. To be comfortable

If a room is tightly sealed, any human in that room would slowly consume the oxygen and increase the amounts of carbon dioxide, water vapor, and various impurities. This could cause drowsiness or even death.

One must remember that space for human living must have air with a good oxygen content and that this air must be kept at a reasonable temperature. It is of utmost importance that fresh air be admitted to provide the oxygen.

The amount of fresh air required depends on the use of the space and the amount of fresh air admitted by infiltration. Adapted from ASHRAE Standard 62-1989 “Ventilation for Acceptable Indoor Air Quality”. Classrooms 15 cfm =0.008 m3/s of fresh air per person to provide enough oxygen and to remove carbon dioxide. If 30 people occupy a space. they would need 415 cfm of fresh air (30×15cfm=415cfm).

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1. Ning X., and Lovell M. R., "On the Sliding Friction Characteristics of Unidirectional Continuous FRP Composites" ASME J. Tribol. 124(1), pp. 5-13,(2002).
2. Barnes M., "Stresses in Solenoids" J. Appl. Phys. 48(5), pp. 2000–2008, (2001).
3. Jones J., "Contact Mechanics", Cambridge University Press, Cambridge, UK, Chap. 6, (2000).
4. Kittel C., "Introduction to Solid State Physics", 8^th Ed., John Wiley and Sons, New York, Chap. 16, (2005).
5. Tung C. Y., "Evaporative Heat Transfer in the Contact Line of a Mixture", Ph.D. thesis, Rensselaer Polytechnic Institute, Troy, NY, (1982).
6. Lee Y., Korpela S. A., and Horne R. N., "Structure of Multi-Cellular Natural Convection in a Tall Vertical Annulus," Proc. 7th International Heat Transfer Conference, U. Grigul et al., eds., Hemisphere, Washington, DC, 2, pp. 221–226, (1982).
7. Elissa K., “Title of paper with only first word capitalized”, unpublished.
8. Saeed R., “Title of paper with only first word capitalized”, Journa of Zankoy Sulaimani-A, in press.