Solve this multiple-choice question and choose the correct option.

Home » Mechanical Engineering » Heat Transfer, Refrigeration and Air Conditioning

Electrolux refrigerator: identify the absorption system type. This domestic absorption refrigerator uses ammonia–water–hydrogen. Complete the classification of the system used.

Difficulty: Easy

single-fluid absorption system
two-fluid absorption system
three-fluid (diffusion) absorption system
vapour-compression refrigeration system

Correct Answer: three-fluid (diffusion) absorption system

Explanation:

Concept/ApproachThe Electrolux (Platen–Munters) refrigerator is a three-fluid absorption system: ammonia (refrigerant), water (absorbent), and hydrogen (inert gas to reduce condenser/evaporator partial pressures). The process uses heat as the driving input.

Final Answerthree-fluid (diffusion) absorption system.

← Previous Question Next Question→

More Questions from Heat Transfer, Refrigeration and Air Conditioning

Modes of heat transfer: radiation and the need for a medium. Complete the statement about radiation heat transfer with respect to intervening media. Choose the option that correctly fills the blank.
Absorption refrigeration (ideal/Carnot): expression for C.O.P. Let T1 = generator (heat source) temperature, T2 = condenser/absorber (heat sink) temperature, T3 = evaporator (refrigerated space) temperature, all in absolute units (K). Select the correct ideal C.O.P. formula for an absorption refrigerator.
Thermal diffusivity comparison: identify the material with the highest α = k/(ρ·cᵖ). Options: iron, lead, concrete, and wood. Select the material that typically exhibits the greatest thermal diffusivity in engineering data. Choose the correct option.
Boundary-layer thickness equality: condition on the Prandtl number (Pr). When do the thermal and hydrodynamic boundary-layer thicknesses become approximately equal over a surface in external flow? Choose the correct value of Pr that ensures δᵗ ≈ δ.
Thermal diffusivity: nature and classification. Identify the most accurate description of thermal diffusivity (α = k/(ρ·cᵖ)). Select the correct statement.
Fluid mechanics/heat transfer fundamentals: define the Reynolds number. Using symbols: ρ = density, V = characteristic velocity, l = characteristic length, μ = dynamic viscosity, ν = kinematic viscosity. Select the correct expression for the Reynolds number (Re).
Thermal conductivity of liquid water versus temperature: qualitative trend. How does the thermal conductivity (k) of water change as temperature rises across the practical engineering range? Choose the most correct qualitative statement.
Definition of a refrigeration system: heat flow direction in operation. Select the description that correctly defines what a refrigeration system does in terms of heat transfer between a cold body and a hot body. Choose the correct option.
Perfect black body: select the correct defining property. Among the listed statements, identify the defining characteristic of an ideal black body in radiation heat transfer. Choose the correct option.
Aircraft refrigeration design: prime design criterion for onboard systems. When designing an aircraft's refrigeration system, which factor is the foremost consideration from an aeronautical/weight perspective? Choose the correct option.

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion