Centrifugal pressure is determined by?

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Prepare for the New York City Refrigeration License Exam I. Utilize flashcards, multiple-choice questions, and detailed explanations to boost your readiness. Ace your licensing exam!

Multiple Choice

Centrifugal pressure is determined by?

Explanation:
Centrifugal pressure is set by how fast the impeller is spinning. The motor’s speed determines the tangential velocity of the blades and how much energy is transferred to the refrigerant; more energy means a higher pressure rise (for a given impeller size and flow, the pressure increase grows with speed). Displacement is a feature of positive-displacement machines, not centrifugal ones, so it doesn’t set the pressure rise here. Ambient temperature can affect refrigerant density and performance but doesn’t determine the pressure the impeller creates. Lubricant viscosity affects losses and efficiency, not the fundamental pressure generated by the spinning impeller.

Centrifugal pressure is set by how fast the impeller is spinning. The motor’s speed determines the tangential velocity of the blades and how much energy is transferred to the refrigerant; more energy means a higher pressure rise (for a given impeller size and flow, the pressure increase grows with speed).

Displacement is a feature of positive-displacement machines, not centrifugal ones, so it doesn’t set the pressure rise here. Ambient temperature can affect refrigerant density and performance but doesn’t determine the pressure the impeller creates. Lubricant viscosity affects losses and efficiency, not the fundamental pressure generated by the spinning impeller.

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