Mitsubishi Electric GUG-01SL-E, Техническое руководство

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48
CHAPTER
9
Model selection and capacity calculation
Dx-coil unit and outdoor unit are selected as shown below.
72 %
4.2 kW
1.0
1.0
LGH-100RVX-E
11.3 kW
1000 m
3
/h
1000 m
3
/h
22.7 °C
45.8 kJ/kg(DA)
3.2 kW
71 %
7.1 kW
III: Calculation of Lossnay energy recovery effect
(A) Lossnay model
(B) Temperature exchange efficiency for summer (at 1000m
3
/h)
(C) Enthalpy exchange efficiency on cooling (at 1000m 3 /h)
(D) Lossnay outlet air temperature
= (G) – ((G) - (I)) x (B) = 27°C - (27°C - 21°C) ×0.72
(E) Lossnay outlet air enthalpy
= (H) – ((H) – (J)) x (C) = 55.4 - (55.4 – 41.8)×0.71
(F) Energy recovered by Lossnay
=((H) – (E)) x
ρ x Q
f
/3600 = (55.4 – 45.8)×1.2×1000/3600
Example 2-1 condition Outdoor air Return air
Dx-coil inlet air
(Lossnay outlet air)
Dry-bulb temperature [˚C]
(G)
27
(I)
21 22.7
Wet-bulb temperature [˚C] 19.5 15 16.4
Absolute humidity [kg/kg(DA)] 0.0111 0.0082 0.0090
Relative humidity [%] 50 53 53
Enthalpy [kJ/kg(DA)]
(H)
55.4
(J)
41.8 45.8
STEP2. Selection of Dx-coil unit system
STEP3-1. Calculation of Dx-coil unit cooling capacity
Adequate Dx-coil unit model
GUG-02SL-E
Lossnay model
LGH-100RVX-E
Adequate outdoor unit model
PUHZ-ZRP71
Temperature control feature
Return air temperature control
I: Read out characteristics from the specification sheet
II: Calculate Dx-coil inlet air ( Lossnay outlet air ) condition
III: Calculate the capacity of Dx-coil unit
(1) Calculation conditions
- See the parameters used so far.
(2) Characteristics read out from specifications
(B) Cooling capacity under specification condition
- Lossnay recovery
- Cooling capacity of Dx-coil unit
See the calculations and table in STEP1- III.
(1) Air volume factor
(A) Designing air volume
(B) Related air volume of Lossnay unit at fan speed 4
(C) Air volume ratio = (A) / (B)
(D) Air volume factor C
1
(Find C
1
from the graph on the page 62. )