Answer:
![3.32\ \text{kW}](https://tex.z-dn.net/?f=3.32%5C%20%5Ctext%7BkW%7D)
Explanation:
= Outside temperature = ![-5^{\circ}\text{C}](https://tex.z-dn.net/?f=-5%5E%7B%5Ccirc%7D%5Ctext%7BC%7D)
= Temperature of room = ![21^{\circ}\text{C}](https://tex.z-dn.net/?f=21%5E%7B%5Ccirc%7D%5Ctext%7BC%7D)
= Heat loss = 135000 kJ/h = ![\dfrac{135000}{3600}=37.5\ \text{kW}](https://tex.z-dn.net/?f=%5Cdfrac%7B135000%7D%7B3600%7D%3D37.5%5C%20%5Ctext%7BkW%7D)
Coefficient of performance of heat pump
![\text{COP}=\dfrac{1}{1-\dfrac{T_c}{T_h}}\\\Rightarrow \text{COP}=\dfrac{1}{1-\dfrac{273.15-5}{273.15+21}}\\\Rightarrow \text{COP}=11.3](https://tex.z-dn.net/?f=%5Ctext%7BCOP%7D%3D%5Cdfrac%7B1%7D%7B1-%5Cdfrac%7BT_c%7D%7BT_h%7D%7D%5C%5C%5CRightarrow%20%5Ctext%7BCOP%7D%3D%5Cdfrac%7B1%7D%7B1-%5Cdfrac%7B273.15-5%7D%7B273.15%2B21%7D%7D%5C%5C%5CRightarrow%20%5Ctext%7BCOP%7D%3D11.3)
Input power
![W_i=\dfrac{Q_h}{\text{COP}}\\\Rightarrow W_i=\dfrac{37.5}{11.3}\\\Rightarrow W_i=3.32\ \text{kW}](https://tex.z-dn.net/?f=W_i%3D%5Cdfrac%7BQ_h%7D%7B%5Ctext%7BCOP%7D%7D%5C%5C%5CRightarrow%20W_i%3D%5Cdfrac%7B37.5%7D%7B11.3%7D%5C%5C%5CRightarrow%20W_i%3D3.32%5C%20%5Ctext%7BkW%7D)
The minimum power required to drive this heat pump is
.
Answer:
B only
Explanation:
Squeeze-type resistance spot welding (STRSW)is a type of electric resistance welding that brings about the weld on interfacing sheet metal pieces through which heat generated from electric resistance bring about fusion and welding of the two pieces together
Therefore, it is not meant for opening but joints but it can be used for making replacement spot welds adjacent to the original spot weld due to the smaller heat affected zone (HAZ) created by the STRSW process.
An immediate strength loss. This is why Sling Webbing has red core yarns to visually reveal damage and act as a basis for sling rejection.
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Answer:
Nba Youngboy
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Explanation: