Description and Specification for Lab Tenders
Astra Scientific Junkers Gas Calorimeter.
This Gas Calorimeter works on the Junker's principle of burning of a
known volume of gas and imparting the heat with maximum efficiency to
steadily flowing water and finding out of the rise in temperature of a
measured volume of water. The formula, Calorific Value of Gas X Volume
of Gas = Volume of water X Rise in Temperature, is then used to
determine the Calorific Value of the Gas (assuming that heat capacity of
water is unity).
EQUIPMENT
This equipment consists of the Calorimeter with Powder Coated Stainless
Steel exterior with burner (with choice of two nozzles) on a tripod
stand, a Gas Flow Meter and a pressure governor. Requisite tubing &
measuring jars as well as thermometers (0.1oC graduation) for reading
inlet & outlet water temperatures are also provided along with a
detailed instruction manual.
Calorimeter
This Calorimeter covers a wide range between 120 BTU (1000 to 26000 K
Cal/m3). The Calorimeter is fixed on a tripod stand having leveling
screws to keep the Calorimeter in perfectly vertical position. The
Calorimeter mainly consists of a gas combustion chamber, heat exchanger
and water flow system. Heat exchanger is designed for maximum efficiency
of heat transfer and is fabricated out of heavily tinned copper sheet. A
constant water head maintenance device provided in the feed water pipe
along with the inlet water flow regulator is fixed to the outer housing
of teh Calorimeter. The outer housing is of powder coated stainless
steel. This constant water level attachment has an over flow device
through which excess water drains out. Water from this constant head
device enters the bottom of the heat exchanger through inlet water flow
regulator and raised along the annular space, comes up to the filtering
position at the top and gets collected at the swinging funnel
attachment. While going up it absorbs the heat generated by burning the
gas in the burner located at the bottom of the central chamber of the
Calorimeter. Two thermometers are provided in the water inlet and
outlets ports. Temperature of the effluent gas can be measured from the
thermometer fixed at the exhaust gas outlet. Provision for fixing the
burner is provided at the Calorimeter base. An outlet for collection of
condensate is provided at the bottom.
Gas Flow Meter
The Gas Flow Meter Provided is Cat. No. IRI 08. It is a wet type Gas
Flow Meter, with recording facility on a mechanical counter of the
number of revolutions made, which gives total volume of gas burnt, For
more details of the Flow Meter, please refer to its individual leaflet.
Pressure Governor
This is to regulate the pressure of gas before it enters the flowmeter.
These governors are factory adjusted for a required pressure.