Thermodynamics > Mini steam power plants




This is a small low cost miniature power plant designed for educational purpose.

A hand feed pump supplies water from a feed tank to a small gas fired boiler. Steam is throttled to a single cylinder, double acting reciprocating engine. A small DC generator is connected to the engine by a belt, and electrical load is applied. The dynamometer is provided for mechanical power measurement. Exhaust from the steam engine is condensed in a water cooled condenser. Condensate is collected and measured for steam rate. The unit requires outside water supply. Condenser water cooling unit is available (optional).  

Instruments are provided for monitoring and controlling the plant operation and performance as well as for safety.

Instruction manual is also included.

  • Fuel consumption

  • Efficiencies for boiler, engine and overall plant.

  • Condenser heat transfer coefficient.

  • Heat balance and energy utilization.

  • Rankine cycle efficiency.

  • Boiler
- Type: Fire tube vertical boiler 
- Equivalent evaporation: Approx. 7 kg/h steam 
- Maximum working pressure: 5 kg/cm2 (0.49 MPa) 
  • Boiler accessories
: Steam separator, manual feed pump, safety valve, level gauge and low level alarm 
  • Fuel
: Liquefied Petroleum Gas (LPG) 
  • Feed water tank
: Stainless steel with level gauge 
  • Steam engine
- Type: Single cylinder, double acting 
- Plant output at maximum working pressure  
 : Mechanical, approximately 7 W 
 : Electrical, approximately 2 W 
- Maximum speed: Approx. 2000 rpm 
  • Mechanical power system
: Mechanical brake dynamometer with spring balance and weights 
  • Electrical power system
: DC generator with resistive load 
  • Condenser
: Shell and tube type 
  • Measuring instruments:
- Pressure: Pressure gauge for boiler steam outlet 
- Flow rate: Flow meters for boiler fuel, condenser cooling water 
- Dynamometer torque: Spring balance and weights 
- Condensate measurement: Graduated cylinder and stop watch 
- Sensors with digital display: Temperatures for feed water, boiler steam outlet, steam engine inlet, steam engine outlet, 
 : condensate, cooling water inlet, cooling water outlet and exhaust stack 
 : Engine speed 
 : Generator voltage and current 
  • Accessory
: Boiler cleaning kits 
  • Power supply
: 220 V, 1 Ph, 50Hz. Other power supply is available on request. 

Net (unassembled) Shipping Dimensions WxLxH:

76 x 90 x 155 cm

Net Weight: Approx. 90 kg

  • TH120S
Learning Software
 to support both online/offline training with data calculation and analysis by manual data entry from analog measuring instruments.
  • TH100-021
Digital flue gas analyzer for O2 and CO contents
  • TH120-001
Fuel tank (Thailand market only)
 LPG tank (4 kg) with pressure regulator
  • TH120-005EBA
Mini Electric Boiler instead of gas fired boiler. By using electric boiler, the boiler
 efficiency experiment is excluded.
 In this case, LPG tank with pressure regulator and gas rotameter are not required.
- Heater: 5 kW
- Equivalent evaporation: 7.5 kg/h steam
- Maximum working pressure: 9 kg/cm2 (0.88 MPa)
- Power consumption: Power meter with digital display
- Accessories: Safety valve
 : Level gauge and low-level alarm
 : Temperature control unit to limit temperature of superheat steam to not more than 180°C
- Power supply: 380 V, 3 Ph, 50Hz. Other power supply is available on request.
  • TH120-010A
Electric feed pump instead of manual feed pump
  • TH120-011
Throttling calorimeter
  • TH120-014
Condenser cooling unit
 The unit is to cool condenser cooling water and make this equipment to be self-contained instead of using outside water supply. It is completed with transfer pump.
- Type: Fins and tube
- Capacity: 2 RT
  • TH120-040
Two-cylinder steam engine instead of standard engine
  • TH120-050
Computer Interface (computer not included)
 This includes TH120S and significant sensor(s) instead of analog measuring instrument(s), data acquisition (capture, display, graph and/or data export),
 additional software function for real-time data logging with computer interface unit and WiFi feature for data logging and real-time display remotely on smartphone (iOS and Android)

TH120SLearning Software
 to support both online/offline training with data calculation and analysis by manual data entry from analog measuring instruments.