Frequently Asked Question
Answer: 80% of quote requests for heater are processed within three business hours. Heaters requiring engineering review due to amperage, watt density, application and specific end product could take a business day or longer. Most purchase orders are confirmed within 3 business hours. For oven quote, it will take a longer 1-2 days due to design preparation work and drawing
For typical order quantities < 10 pieces, the delivery date is usually 3-5 business days. For customized industrial oven and furnace, the delivery time is typically 8-10 weeks depending on internal chamber size and max operating temperature.
Our design engineer can customize your heater/oven requirements. Depending on the type of customization and order quantity, your jingang sales personnel will work with you to build a heater/oven system that meets your exact needs/spec requirements.
The first step is to carry out a heat requirement calculation for your application. This will tell you the size of heater in KW you need. Next, you need to select what type of heater you want, where it is for heating air,/gases, liquid or metal. Finally, check with your electrician to make sure your facilities electricity supply has enough KW/ampere for the heater you intend to run.
Typical thumb of rule is to choose a 3 phase electric heater for high ampere application. This applies to heater that has a KW well over 3KW/ 13A on single phase.
Not all airflow patterns are created equal. Different airflow patterns are needed for different part geometry and processes. Choices include vertical airflow, full horizontal airflow, and horizontal/vertical (combined).
Vertical Airflow – is best suited for processes where parts are hung from racks or hooks, with the air supplied from the top down or bottom up.
Full Horizontal Airflow – is used when product is loaded onto shelves or a shelf cart for processing. With the supply on one side and the return duct on the other, the product becomes encircled with air.
Horizontal/Vertical Airflow – is suitable for applications with large parts, and where there is a need for air circulation to be supplied from both sides and then returned to the top of the oven.
Oven temperature uniformity is important to ensure uniform heating of the product. This is different from control sensitivity.
Uniformity – is the greatest deviation, in degrees, between the lowest and highest temperature points within the work area. For example, it is important to note that ±5°F represents an actual difference of 10°F (5.5°C) between the highest/lowest measured points in the oven/furnace.
Control Sensitivity – relates to the ability of a control instrument to measure and react to temperature fluctuations at a given set point.
Many factors influence uniformity:
- Controller calibration
- Sensor calibration
- Sensor placement within the work area
- Oven operating temperature (higher temperature/greater variables)
- Air circulation (the greater the air circulation, the better the uniformity)
- Placement of the product within the work area
- Product geometry
- Airflow pattern
- Heat loss through walls
- Metal-to-metal conduction
It is important to take all of these variables into consideration and to utilize a 9-point thermocouple test to ensure that the specified uniformity is obtained for the application. Although this 9-point test is not always included with the oven purchase, it is recommended and usually available for an additional cost. Some applications such as paint or resin curing require a temperature uniformity of ±10°F (±5.5°C). Many drying or preheating processes only require a uniformity of ±20°F (±11°C). Some technical processes need a uniformity of ±5°F (±2.7°C). Knowing your temperature uniformity requirements will help with oven selection.
Some factors to consider when determining the proper oven chamber size are:
- The maximum dimensions of your products
- The required spacing between multiple parts, and between the parts and any ductwork (Usually this dimension is 3” to 6″)
- The quantity of units to be processed in a single batch, and the space they will require after considering the required clearances
- The method of material handling, being sure you have enough room to move the product in and out of the oven safely
After these factors have been determined, you will have arrived at an approximate work area dimension. If the work area is too small, there may be an inadequate amount of space between parts, which will result in less than optimal oven performance due to poor airflow. Similarly, when the work area is too large, there is an excess of space to heat and circulate air through, which wastes energy, space and, most importantly, time.