22-Mec-A1 Applied Thermodynamics and Heat Transfer
Worked solutions to 13 past sittings (2013–2019), 104 questions. Pick a sitting, or start from a topic below.
- December 2019
- December 2018
- May 2018
- December 2017
- May 2017
- December 2016
- May 2016
- May 2015
- December 2014
- May 2014
- December 2013
- May 2013
- Undated paper
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Compressor Power (2 sittings): May 2015 Q1 · May 2014 Q1
- Convection (2 sittings): May 2015 Q7 · May 2014 Q7
- Cross-Flow Tube-Bank Heat Exchanger (2 sittings): December 2016 Q8 · May 2016 Q8
- Freon-12 heat pump (2 sittings): December 2019 Q4 · December 2014 Q4
- Freon-12 Refrigeration Cycle (2 sittings): May 2014 Q4 · December 2013 Q4
- Radiation (2 sittings): May 2015 Q7 · May 2014 Q7
- Reheat Rankine Power Plant (2 sittings): May 2015 Q2 · December 2013 Q2
- Self-cleaning oven composite window (2 sittings): May 2015 Q5 · Undated paper Q5
- Shell-and-tube heat exchanger sizing (2 sittings): May 2015 Q8 · Undated paper Q8
- Vertical Power-Amplifier Plate (2 sittings): May 2015 Q7 · May 2014 Q7
Questions by sitting
December 2019
- Question 1: Irreversible adiabatic air compression & Freon-12 vessel charging
- Question 2: Flash chamber feeding a steam turbine
- Question 3: Reciprocating air compressor power
- Question 4: Freon-12 heat pump: COP and operating saving
- Question 5: Radiant-heated evacuated tube: radial conduction & surface convection
- Question 6: Current-carrying conductor with internal heat generation
- Question 7: Cooling rate of a molten weld droplet
- Question 8: Two-shell-pass, twelve-tube-pass oil cooler
December 2018
- Question 1: Gas mixing in connected vessels & an air-standard Otto cycle
- Question 2: Throttling calorimeter, turbine power and an isentropic-with-heat-loss process
- Question 3: Regenerative automotive gas-turbine power plant
- Question 4: Ammonia ice-making refrigeration plant
- Question 5: Reduction of heat loss from a steam pipe by insulation
- Question 6: Heat generation in a current-carrying conductor
- Question 7: Liquid-sodium heat exchanger duct in a molten-lead pool
- Question 8: Shell-and-tube water-to-air heat exchanger
May 2018
- Question 1: Cycle energy table & heating of a rigid two-phase vessel
- Question 2: Ideal regenerative steam cycle with a closed feedwater heater
- Question 3: Air-standard Diesel cycle & fuel rate
- Question 4: Centrifugal air compressor with kinetic-energy terms
- Question 5: Current-carrying wire with a ceramic sheath (radial conduction + generation)
- Question 6: Water cooled in a tube at constant wall temperature
- Question 7: Frost threshold on a grapefruit (radiation + convection balance)
- Question 8: Counterflow heat-exchanger area for a higher outlet temperature
December 2017
- Question 1: Water in a piston–cylinder resting on stops
- Question 2: Flash chamber feeding a steam turbine
- Question 3: Refrigerant selection: ammonia vs. R-134a
- Question 4: Reciprocating compressor volumetric efficiency
- Question 5: Insulation thickness to stop a pipe freezing
- Question 6: Length of a water tube cooled by cross-flowing air
- Question 7: Surface temperature of a natural-convection heating panel
- Question 8: Number of parallel tubes in a steam-heated exchanger
May 2017
- Question 1: Adiabatic Tank Filling and an Adiabatic Air Blower
- Question 2: Air-Standard Dual (Mixed) Cycle
- Question 3: Turbojet on a Static Test Bed — Nozzle Velocity and Thrust
- Question 4: Ammonia Vapour-Compression Refrigeration Plant
- Question 5: Heat Loss from an Insulated Steam Pipe
- Question 6: Oil in a Tube Heated by Cross-Flow Gas — Wall-Temperature Check
- Question 7: Cryogenic Dewar with a Radiation Shield
- Question 8: Cross-Flow Finned-Tube Heat Exchanger (ε–NTU)
December 2016
- Question 1: Spring-Loaded Piston Heating and Adiabatic Water Pumping
- Question 2: Reciprocating Air Compressor with Clearance
- Question 3: Regenerative Steam Power Plant with One Feedwater Heater
- Question 4: Gas-Turbine Air Refrigeration Machine
- Question 5: Heat Loss from a Pipe Before and After Adding Insulation
- Question 6: Exit Gas Temperature in a Ceramic-Lined Duct
- Question 7: Electrically Heated Pipe — Power to Hold 30 °C
- Question 8: Cross-Flow Tube-Bank Heat Exchanger
May 2016
- Question 1: Stepped-Piston Pressure and Isothermal Steam Expansion
- Question 2: Combined Reheat / Regenerative Steam Cycle
- Question 3: Non-Ideal Brayton Cycle with Duct Pressure Drop
- Question 4: Freon-12 Refrigeration System from Test Data
- Question 5: Insulation Thickness to Cut a Steam-Tube Heat Loss
- Question 6: Oil-Heating Tube in Cross-Flow — Wall-Temperature Limit
- Question 7: Surface Temperature of a Power Transistor
- Question 8: Cross-Flow Tube-Bank Heat Exchanger (ε–NTU)
May 2015
- Question 1: Bursting Capsule and Compressor Power
- Question 2: Reheat Rankine Power Plant
- Question 3: Brayton Gas-Turbine Power Plant
- Question 4: Freon-12 Vapour-Compression Refrigeration
- Question 5: Self-Cleaning Oven Composite Window
- Question 6: Uniformly Heated Water-Heater Tube
- Question 7: Vertical Power-Amplifier Plate — Convection and Radiation
- Question 8: Shell-and-Tube Heat Exchanger Sizing
December 2014
- Question 1: Sealed Freon-12 Tube and Polytropic Nitrogen Compression
- Question 2: Part-Load Steam Turbine by Throttle Governing
- Question 3: Gas-Turbine Cycle with Reheat and Ideal Regeneration
- Question 4: Freon-12 Heat Pump versus a Fuel Furnace
- Question 5: Insulating a Copper Steam Tube to Cut Heat Loss
- Question 6: Water Warmed Flowing Through a Duct in Warm Air
- Question 7: Refrigeration Load on an Indoor Ice Rink
- Question 8: Maximum Oil Flow in a Tube-in-Shell Cooler
May 2014
- Question 1: Cooling Saturated Steam and Compressor Power
- Question 2: Single-Acting Reciprocating Compressor with Clearance
- Question 3: Compression-Ignition (Dual) Cycle
- Question 4: Freon-12 Refrigeration Cycle (Coefficient of Performance)
- Question 5: Composite Plastic–Cork Wall with Radiant Heating
- Question 6: Water-Cooled Tube in Cross-Flow Air
- Question 7: Vertical Power-Amplifier Plate — Convection and Radiation
- Question 8: Cross-Flow Heat Exchanger (Both Fluids Unmixed)
December 2013
- Question 1: Polytropic Expansion and Non-Adiabatic Compression
- Question 2: Reheat Rankine Power Plant
- Question 3: Regenerative Gas-Turbine (Brayton) Cycle
- Question 4: Freon-12 Refrigeration Cycle
- Question 5: Heat Loss Through a Single-Glazed Window
- Question 6: Transient Heating of a Flat-Iron Baseplate
- Question 7: Thermocouple Radiation Error in a Duct
- Question 8: Counterflow Tube-in-Shell Heat Exchanger (Water → Helium)
May 2013
- Question 1: Helium Three-Process Cycle
- Question 2: Two-Stage Reheat Steam Turbine with Extraction
- Question 3: Double-Acting Air Compressor with Clearance
- Question 4: Window Air Conditioner Using Freon-12
- Question 5: Critical Radius of Insulation on a Hot-Water Pipe
- Question 6: Heat Loss from Air Flowing in a Square Duct
- Question 7: Surface Temperature of an Electric Charcoal-Lighter Element
- Question 8: Shell-and-Tube Heat Exchanger (Water Heated by Air)
Undated paper
- Question 1: Work and internal-energy change of a gas with a P–V equation of state
- Question 2: Throttling of saturated liquid ammonia
- Question 3: Two-stage steam turbine with reheat
- Question 4: R-134a vapour-compression refrigeration cycle
- Question 5: Self-cleaning oven composite window
- Question 6: Ice-storage cooling tank
- Question 7: Power-amplifier case temperature (free convection + radiation)
- Question 8: Shell-and-tube heat exchanger sizing