Answer:
1141
7.2
Explanation:
The evaporator Temperature T1 = -10°C
h1 = 244.55kj/kg
S1 = 0.93782kj/kg
The enthalpy at second state from given condenser pressure from super heated refrigerant table
P2 = 600
S2 = S1
h2 = 267.19kj/kg
Enthalpy at 3 and 4 from condenser pressure
h3 = h4 = 81.5kj/kg
To get cooling load
QL = m(h1-h4)
M= 7
= 7(244.55-81.5)
= 7(163.05)
= 1141.35kw = 1141KW
COP
= h1-h4/h2 -h1
= 244.55-81.5/267.19-244.55
= 163.05/22.64
= 7.2
Answer:
TRUE
Explanation:
Steel has low carbon percentage than cast iron.
Steel has carbon content around 2% where as cast iron has carbon content around 4%.
hence, more the carbon percentage more brittle is the material i.e. cast iron is brittle in nature and steel is ductile in nature.
that is why steel is used in various material. It is used from utensil to huge structures.
The answer is the second one b