СВАО г.Москва, ул. Полярная, д.41, стр. 1
Тел./факс: (495) 225-35-42 (многоканальный)
(495) 580-78-45, 580-78-46, 741-74-85
(499) 760-41-85, 760-42-14
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Educational laboratory facility

The facility is intended for the application in the Processes and Apparatuses laboratory course and the Thermodynamics and Heat Transfer course in universities and colleges and allows organizing a cycle of laboratory courses in thermal processes:

Appearance of laboratory facility depends on research of studied processes.

Facility Function

The facility is intended for the application in the Processes and Apparatuses laboratory course and the Thermodynamics and Heat Transfer course in universities and colleges and allows organizing a cycle of laboratory courses in thermal processes:

 

• The research of heat exchange apparatuses' work in the process of heat exchange between steam-liquid and liquid-gas systems (heat exchange apparatuses test in steady conditions of heat exchange, definition of thermal loads and heat losses, definition of average motive power of thermal processes in view of various schemes of heat-transfer agents movement (forward flow/backflow), heat transfer factors, estimation of thermal resistance parity during heat exchange between various media, definition of thermal protection material thermal resistance (heat conductivity factor);

• The research of heat transfer factor dependence (heat emission) between steam-liquid systems from the speed of movement of the liquid medium;

• The research of heat transfer factor dependence (heat emission) between liquid-gas systems from the speed of movement of gas media.

Methodological Support

The study guide to the given laboratory facility contains extensive theoretical part with the description of engineering methods of thermal processes calculation and apparatuses for commonly encountered cases in industrial practice, detailed description of laboratory facility, its system, operation, control and monitoring microprocessor apparatuses, order of laboratory research realization, processing and submission of experimental data. Tables with thermal physic characteristics of media participating in heat exchange and schedules of criterion dependences for calculation of heat transfer factors are presented in the appendix to the guide.

 

The study guide consists of 28 pages.

Facility Description


Experimental Facility Chart

The facility consists of two heat exchangers (A1, А2), steam and gas generator (А3), gas blower (Н1), electromagnetic valves (K1, К4) and testers with corresponding gauges for measurement and regulation of parameters.

Heat exchanger of "tube-in-tube" type (A1) is intended for heat exchange between steam-liquid systems. Internal pipe is made of copper and its diameter is 6x1 mm, external pipe is made of stainless steel and its diameter is 34x2 mm. Length of internal pipe, on which heat exchange surface is calculated, is L1=1220 mm, heat exchange area is F1=0.023 м2.

One-pass heat exchanger (A2) of tubular type is intended for heat exchange between liquid-gas systems. Its matrix consists of n=37 corrosion-proof pipes with the diameter of d = 15x0.5 mm. External cover is made of corrosion-proof pipe with diameter equal to 154x2 mm. Length of heat exchanger tubes is L2=1550 mm, heat exchange area is F2=2.5m2.

The facility is equipped with local electric steam and gas generator (А3) with volume equal to 12 l and capacity equal to 12 kW (in accordance to Pressure vessels operating regulations, out of ROSGORTECHNADZOR sphere). Steam and gas generator's power consumption from the electric mains is defined by means of the Merkuriy 231 (SE) type electronic power meter with pulse output and the SI8 (RE) pulse counter.

In order to maintain safe work of the steam and gas generator is equipped with water level and maximum working pressure (to 0.3 MPa) limitation, and also with mechanical safety valve.

Electric control circuit of steam and gas generator is contactless triac. поддерживание the specified parameters of steam (temperature-pressure) are maintained by PID control by means of TRM-101-IR microprocessor device.

Delivery of water to the facility is carried out from water supply system and air - from internal gas blower Н1 of G 200 type (high-pressure fan).

Consumption of cold water from water supply system is measured by two devices: ULTRAFLOW KAMSTRUP (SV) - ultrasonic meter with pulse output (300 imp./liter) and Р1 rotameter. SV meter conjointly with pulse meter SI8 (RV) ensures digital calculation of water consumption. Rotameter (Р1) is analogue device and it allows to do visual monitoring of current water consumption.

If necessary, current water consumption can be corrected by the valve (VR1). Cold water is delivered to the input of heat exchanger (A1) and in internal pipe where it exchanges heat with saturated water steam coming from steam and gas generator (АЗ) in ring space between internal and external pipes of heat exchanger (A1). Steam condensate flows down back on outlet line in steam and gas generator (АЗ).

Heat exchanger (A1) is equipped with blowoff cock (K32) for air removal at facility start-up. Heated water from heat exchanger (A1) comes in tubing string of heat exchanger (A2) where it heats up a stream of air delivered to shell side of heat exchanger (A2) by fan (Н1). The stream of air can be switched in direct-flow or counterflow direction of movement in relation to water stream by means of electromagnetic valves (K1-4). Air consumption is defined by means of pressure difference on membrane (DR) of DKS-50 type, pressure meter (DD) of Zond 10DD-1655 type and secondary apparatus TRM 200. Air consumption adjustment is carried out by change of fan (H1) engine rpm by means of frequency converter (ChP). In order to measure input and output temperatures (Т1? Т10) of heat-carriers in heat exchangers resistance sensors of TS-50M type which are established in the copper sleeves located in inlet and outlet branch pipes and five secondary apparatuses TRM 200 are used. All measuring and regulating apparatuses are equipped with RS 485 interface intended for communication with the personal computer and transfer of results of experiment by means of local computer network. The top, average and bottom water level in steam and gas generator is controlled by SAU-7E apparatus. Controls which turn on the facility, start-up steam and gas generator, switch direct-flow and counterflow movement of streams of heat-carrying agent, step change of gas blower rotor rpm, test instruments and electrics are located in control panel and power board. External surface of steam and condensate feeding lines and external surface of heat exchangers (A1, А2) are insulated by means of modern insulating materials (without asbestos application) essentially reducing power losses. Bearing structure of the facility is made of shaped tube (30х30х2mm). Overall dimensions of the facility - 1800х800х1700mm. Movement of the facility is carried out by means of wheels. Power consumption - 5? 12 kw.