Refrigeration and Air Conditioning
The relative humidity lines on a psychrometric chart are

Curved lines
Horizontal and non-uniformly spaced
Horizontal and uniformly spaced
Vertical and uniformly spaced

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Refrigeration and Air Conditioning
A one tonne refrigerating machine means that

One tonne is the total mass of machine
One tonne refrigerant is used
One tonne of water can be converted into ice
One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

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