What is the By-pass factor for heating coil, if td1 = temperature at entry, td2 = temperature at exit and td3 = coil temperature?

The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

A

(td₂ - td₃)/(td₃ - td₁)

B

(td₃ - td₂)/(td₃ - td₁)

C

(td₃ - td₁)/(td₂ - td₃)

D

(td₃ - td₁)/(td₃ - td₂)

What is the formula of logarithmic mean temperature in terms of By-pass factor? b) Tm = td2 – td1 / log10 c) Tm = td2 – td1 / loge d) Tm = td2 – td3 / loge

A

Tm = td2 – td1 / loge

B

1/BPF

C

1/BPF

D

1/BPF

The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil)

A

(td₁ -td₃)/( td₂ -td₃)

B

(td₂ -td₃)/( td₁ -td₃)

C

(td₃ -td₁)/( td₂ -td₃)

D

(td₃ -td₂)/( td₁ -td₃)

What is the By-pass factor for cooling coil, if td1 = temperature at entry, td2 = temperature at exit and td3 = coil temperature?

A

td3 – td1 / td3 – td1

B

td3 – td2 / td3 – td1

C

td3 – td2 / td2 – td1

D

td2 – td3 / td1 – td3

What is the contact factor for cooling coil, if td1 = temperature at entry, td2 = temperature at exit and td3 = coil temperature?

A

td1 – td2 / td1 – td3

B

td2 – td1 / td3 – td1

C

td3 – td2 / td2 – td1

D

td3 – td2 / td1 – td2

What is the contact factor for heating coil, if td1 = temperature at entry, t2 = temperature at exit and td3 = coil temperature?

A

td3 – td1 / td3 – td1

B

td2 – td1 / td3 – td1

C

td3 – td2 / td2 – td1

D

td3 – td2 / td1 – td2

What is the By-pass factor for heating coil, if td1 = 19°C, td2 = 25°C and td3 = 37°C?

A

0.75

B

0.4

C

0.7

D

0.1

What is the contact factor for heating coil, if td1 = 11°C, td2 = 32°C and td3 = 47°C?

A

0.5833

B

0.4833

C

0.7833

D

0.1833

The bypass factor (B.P.F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil and td₃ = Dry bulb temperature of heating coil)

A

$$\frac{{{\text{t}}{{\text{d}}_2} - {\text{t}}{{\text{d}}_3}}}{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}$$

B

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_2}}}{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}$$

C

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}{{{\text{t}}{{\text{d}}_2} - {\text{t}}{{\text{d}}_3}}}$$

D

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_2}}}$$

What is the By-pass factor for cooling coil, if td1 = 49°C, td2 = 36°C and td3 = 30°C?

A

0.315

B

0.31

C

0.320

D

0.3

What is the By-pass factor for heating coil, if td1 = temperature at entry, td2 = temperature at exit and td3 = coil temperature?

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