JOB REF:
WORKSHEETS - SAMPLE SELECTION # 2
Preliminary Data Given:
1. Location at Reno, Nevada, 95
o
F design ambient and 4,000 feet elevation.
2. Multiple circuits required with evaporating temperatures, condensing temperatures, compressor capacities and
refrigerant types as listed below.
Use WORKSHEET-MULTIPLE CIRCUITS (P. 27) to complete selection of condenser.
1. SYSTEM DATA REQUIREMENTS
CONDENSER DESIGN AMBIENT TEMP = (AT )
o
F
ALTITUDE = SEA LEVEL or FEET FACTOR =
(See P. 2)
CIRCUIT INFORMATION
CIRC # 1 CIRC # 2 CIRC # 3 CIRC # 4
OPEN
HERMETIC
EVAP. TEMP
o
F =
CONDENSING TEMP =
COMPR CAP. (MBH) =
REFRIGERANT =
TD =
(Cond Temp - Amb.)
2. THR (Total Heat of Rejection) CALCULATION
COMPR CAPACITY (MBH) X HRf X ALTf X REFf = THR (MBH) / TD = CL
CIRC # 1 X X X = / =
CIRC # 2 X X X = / =
CIRC # 3 X X X = / =
CIRC # 4 X X X = / =
TOTAL THR Capacity (MBH / 1
o
F TD) =
3. CONDENSER SELECTION
Refer to the R22 CAPACITY selection (P. 2) and select a condenser at the 1
o
F TD that will closely match the above Total THR Capacity
(MBH/ 1
o
F TD).
COND. MODEL # For the model selected, refer to P. 2 and enter...
Max no. of Feeds = (A)
MBH @ 1
o
F TD per feed = (B)
calculate the number of feeds required for each circuit.
CL (MBH / 1
o
F TD) / (B) value = NF number of feeds required (round off to nearest whole #)
CIRC # 1 / =
CIRC # 2 / =
CIRC # 3 / =
CIRC # 4 / =
Total number of feeds required NF =
(must not exceed value (A))
If number of feeds required exceeds number of feeds available then select the next larger size
condenser model that can handle the number and repeat above process.
4. ACTUAL CONDENSING TEMP (per circuit) CALCULATION
First calculate the ATD (Actual TD) as follows: {THR (from sec. 2) / NF value} / value (B) = ATD (Actual Temperature Difference)
CIRC # 1 { / } / =
CIRC # 2 { / } / =
CIRC # 3 { / } / =
CIRC # 4 { / } / =
To find the Actual Condensing Temperature (ACT) just add the Actual Temperature Difference (ATD) to the design ambient (AT)
ATD + AT = ACT
CIRC # 1 + =
o
F
CIRC # 2 + =
o
F
CIRC # 3 + =
o
F
CIRC # 4 + =
o
F
- 29 -
95
TC2000
4,000
1.14
13
25
4.6
31.5
-10
105
4.6
404A
10
-20
105
31.5
404A
10
+20
110
13
22
15
1.33
1.38
1.48
1.55
1.14
1.14
1.14
1.14
1
1
1.03
1.03
19.71
39.33
7.99
57.33
15
15
10
10
1.314
2.622
.799
5.733
10.468
BVC1A12022
24
.447
1.314
2.622
.799
5.733
.447
.447
.447
.447
(2.93) 3
(5.86) 6
(1.78) 2
(12.82) 13
24
19.71
39.33
7.99
57.33
3
6
2
13
.447
.447
.447
.447
14.7
14.7
8.9
9.9
14.7
14.7
8.9
9.9
95
95
95
95
109.7
109.7
103.9
104.9
+10
110
25
22
15
