Table of Contents
Advertisement
CHAPTER 2
Lossnay Construction and Principle
5. Calculation of Lossnay Heat Recovery
The following figure shows the conditions of various air states when fresh air is introduced through the Lossnay Core. If a
conventional sensible heat recovery unit is used alone and is assumed to have the same heat recovery efficiency as Lossnay,
the condition of the air supplied to the room is expressed by point A in the figure. This point shows that the air is very humid in
summer and very dry in winter.
The air supplied to the room with Lossnay is indicated by point S in the figure. The air is precooled and dehumidified in the
summer and preheated and humidified in the winter before it is introduced to the room.
i
SA
i
OA
The quantity of heat recovered by using the Lossnay Core can be calculated with the following formula.
Total heat recovered:
Where
γ = Specific weight of air under standard conditions 1.2 (kg/m
Q = Treated air volume (m
t = Temperature (°C)
x = Absolute humidity (kg/kg')
i = Enthalpy (kJ/kg)
η = Heat recovery efficiency (%)
Suffix meanings
OA : Outdoor air
RA : Return air
SA : Supply air
20
i
RA
O
t
OA
q
= γ · Q · (i
- i
) [W]
T
OA
SA
= γ · Q · (i
- i
) × ηi
OA
RA
3
/h)
i
OA
i
SA
i
RA
R
S
A
t
t
SA
RA
Dry bulb temperature (°C)
3
)
A
O
X
OA
S
X
SA
R
X
RA
X
RA
X
SA
X
OA
t
t
t
RA
SA
OA
Advertisement
Table of Contents
