HVAC-Chapter: 7
Lecture: 7-3
Cooling and heating load calculations
The cooling outdoor design conditions for St. Louis, Missouri, including three columns of
dry-bulb temperatures and corresponding wet-bulb temperatures. The first column
heading, 0.4%, mea

HVAC-Chapter: 7
Exercises-7
Cooling and heating load calculations
Exercise: 7-1
A school classroom is 6 m long, 6 m wide and 3 m high. There is a 2.5 m x 4 m window
in the east wall. Only the east wall/window is exterior. Assume the thermal conditions in

HVAC-Chapter: 7
Lecture: 7-6
Cooling and heating load calculations
1. Infiltration
Infiltration
In a typical building, air leaks into or out of a space through doors, windows, and small
cracks in the building envelope. Air leaking into a space is called i

HVAC-Chapter: 7
Lecture: 7-5
Cooling and heating load calculations
1. Components of internal heat Gain
a. Heat gain from people
The next component of the space cooling load is the heat that originates within the
space. Typical sources of internal heat gai

HVAC-Chapter: 8
Lecture: 8-2
Space air diffusion and Fans
1. Space Diffusion Effectiveness Factor (SDEF)
1
2. Design of air distribution systems
3. Types of air
distribution
devices:
Grille
s and
Registers:
A grille is
an outlet for
supply air
or an inlet

HVAC-Chapter: 7
Lecture: 7-9
Cooling and heating load calculations
1. Psychrometric Analysis
In this lecture we will use the results from our example cooling load calculations to
a. determine the sensible heat ratio for the space,
b. perform a simplified

HVAC-Chapter: 7
Lecture: 7-2
Cooling and heating load calculations
1. Indoor Design Conditions
Research studies have been conducted to show that, with a specific amount of air
movement, thermal comfort can be produced with certain combinations of dry-bulb

HVAC-Chapter: 7
Lecture: 7-4
Cooling and heating load calculations
Most exterior surfaces of a building, however, are exposed to direct sunlight during
some portion of the day. Solar heat energy is generated by the sun and radiated to
earth. Radiant heat

HVAC-Chapter: 8
Lecture: 8-1
Space air diffusion and Fans
1. Introduction
After the required amount of supply air is transmitted to the conditioned space, it is
essential to distribute the air properly within the conditioned space. Thus it is important
to

HVAC-Chapter: 7
Lecture: 7-1
Cooling and heating load calculations
1. Terminology
Before we go further in cooling load calculations, we need to define and
understand some important terminology.
Space: is either a volume or a site without a partition or a

Chapter-9
Lecture: 9-6
GAS POWER CYCLES
Development of Gas Turbines
1. Increasing the turbine inlet (or firing) temperatures
2. Increasing the efficiencies of turbomachinery components (turbines, compressors):
3. Adding modifications to the basic cycle (i