1. What is Bound Moisture Weight?

Definition: The Bound Weight of Moisture is the amount of moisture in kg present in the wet solid which exerts a vapor pressure less than that of pure water for the system.

Purpose: This calculation helps in drying operations to determine the portion of moisture that is more difficult to remove from materials.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M_b \) — Bound Weight of Moisture (kg)
• \( M_i \) — Initial Weight of Moisture (kg)
• \( M_{Ub} \) — Unbound Weight of Moisture (kg)

Explanation: The bound moisture is calculated by subtracting the unbound moisture (which behaves like free water) from the total initial moisture content.

3. Importance of Bound Moisture Calculation

Details: Understanding bound moisture helps in designing drying processes, predicting drying times, and selecting appropriate drying equipment.

4. Using the Calculator

Tips: Enter the initial moisture weight and unbound moisture weight in kg. The unbound moisture cannot exceed the initial moisture.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between bound and unbound moisture?
A: Bound moisture is chemically or physically bound to the material (harder to remove), while unbound moisture behaves like free water.

Q2: How do I measure initial moisture content?
A: Initial moisture is typically measured by weighing the wet sample, drying it completely, and measuring the weight loss.

Q3: What affects bound moisture content?
A: Material properties, particle size, and chemical composition all influence how much moisture becomes bound.

Q4: Why is bound moisture important in drying?
A: Bound moisture requires more energy to remove and affects the drying rate curve in later stages of drying.

Q5: Can bound moisture be zero?
A: Yes, if all moisture in the material is unbound (behaves like free water), the bound moisture will be zero.