Specific Heat Of Air Apparatus
Product Code : EL-HTL-11085
Quick answer: The specific heat of air apparatus determines the specific heat of air at constant pressure (cp). An FHP blower drives air past a 1 kW heating coil; an orifice meter gives the air flow, a digital indicator reads the temperature before and after heating, and a voltmeter and ammeter give the power. Lab Exports manufactures it in Delhi for engineering colleges, polytechnics and TVET institutes.
Specifications
| Component | Specification |
|---|---|
| Air blower | FHP motor driven |
| Airflow measurement | Orifice meter |
| Heater | 1 kW heating coil, central in the test section |
| Temperature indicator | Multichannel digital, 0 to 300 °C |
| Power measurement | Voltmeter and ammeter |
| Services | 220 V single-phase stabilised AC supply; floor space 2 x 1 x 2 m (H) |
How the specific heat of air experiment is done
When air flows steadily past a heater and no work is done, the electrical energy raises the enthalpy of the air. An energy balance gives V I = m cp (T2 - T1), so cp = V I / (m (T2 - T1)), where m is the mass flow of air and T1 and T2 are the air temperatures before and after the coil. Because the air flows at nearly constant pressure, the result is cp, which for dry air near room temperature is about 1.005 kJ/kg K.
The orifice meter gives the volume flow from Q = Cd A sqrt(2 g h_air), where h_air is the pressure difference expressed as a column of air, and the density of air at the inlet temperature converts this to mass flow.
- Start the blower and let the airflow settle.
- Switch on the heating coil.
- At steady state, record the orifice meter reading, the voltmeter and ammeter readings and the inlet and outlet air temperatures.
- Calculate the air mass flow and cp.
- Repeat at another air flow and average the results.
Key features
- 1 kW heating coil placed centrally in the air path for even heating
- Orifice meter for the airflow rate
- Multichannel digital temperature indicator, 0 to 300 °C, for inlet and outlet air
- Voltmeter and ammeter for the electrical input
- FHP motor-driven blower for a steady air supply
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the specific heat of air apparatus at its works in Laxmi Nagar, Delhi, and supplies it to engineering colleges, polytechnics and TVET institutes in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Heat Transfer Lab products
- Forced Convection Apparatus (EL-HTL-11084)
- Natural Convection Apparatus (EL-HTL-11083)
- Heat Transfer in Agitated Vessel (EL-HTL-11087)
- Pin Fin Apparatus (EL-HTL-11082)
- Emissivity Measurement Apparatus (EL-HTL-11088)
- Critical Radius of Insulating Material (EL-HTL-11081)
The full range is in the Heat Transfer Lab section of the Engineering Lab range.
Frequently asked questions
How is the specific heat of air calculated?
From the energy balance cp = V I / (m dT), using the heater power, the air mass flow from the orifice meter and the temperature rise across the coil.
What services does the apparatus need?
A 220 V single-phase stabilised AC supply and floor space of about 2 x 1 m with 2 m height.
What is the price of the specific heat of air apparatus?
Prices are not published on the website. Add the specific heat of air apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-HTL-11085 and the quantity, to receive a quotation.
Does Lab Exports manufacture the specific heat of air apparatus?
Yes. Lab Exports manufactures the specific heat of air apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-HTL-11085.
Request a quote
Email [email protected] with the house code EL-HTL-11085 and the quantity, or add the specific heat of air apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.