Hvac Laws

Question 1

First law of Thermodynamics

Answer 1

First law of Thermodynamics: Energy cannot be
created or destroyed, but energy can be converted
from one form to another. This law applies to
heat and other forms of energy, such as electrical,
mechanical, light, chemical, and atomic. (9)

Question 2

Second Law of Thermodynamics

Answer 2

Second Law of Thermodynamics: Heat always

travels from hot to cold. (9)

Question 3

Boyle’s Law

Answer 3

Boyle’s Law: A gas law that explains the
relationship between pressure and volume. It
states: “The pressure of a gas varies inverscly
opposite) as the volume, provided the temper-
ature remains constant.” (10)

Question 4

Charles’s Law

Answer 4

Charles’s Law: A gas law that explains the
relationship between pressure and volume.
It states: “At a constant pressure, the volume
of a confined gas varies directly as the absolute
temperature. At a constant volume, the absolute
pressure varies directly as the absolute
temperature

Question 5

Dalton’s Law

Answer 5

Dalton’s Law: A gas law of partial pressures. It
states, “In a mixture of gases, each gas behaves
as if it occupies that space alone.” To obtain
the total pressure of a confined mixture of
gases, the pressure for each gas in a mixture
must be added together. (10)

Question 6

: A mixture of two pure refrigerants
that behaves as a single component refrigerant
with a single boiling point at a particular
pressure and temperature. ________ doe not
separate in either the gaseous or liquid state.h

Answer 6

Azeotrope

Question 7

: A refrigerant blend formed by
combining two or more single-component
refrigerants. ________ do not have a specific
pressure for each degree of temperature change
and thus exhibit temperature glide. _______
are designed to replace ozone-depleting CFC
and HCFC refrigerants.

Answer 7

Zeotrope