Su prepares a presentation about the industrial revolution. She wants to change the font on the second slide of her presentation
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The rate of heat transfer by the air conditioner using constant specific heat of 1.004kj/kg.K is 15.06 kW.
<h3>What is the rate of heat transfer?</h3>Rate of heat transfer is the power rating of the machine.
Work done and changes in potential and kinetic energy are neglected since it is a steady state process.
The specific heat in terms of specific heat capacity and temperature change is given as:
The rate of heat transfer, is then determined as follows:
- Qout = flow rate × specific heat
Qout = 0.75 × 20.08 = 15.06 kW
Therefore, the rate of heat transfer by the air conditioner is 15.06 kW.
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Explanation:
Some of the Important Observation used in Entity Relational Diagram.
1. A Chemist can be involved one project or many projects
2. A project can hire just one or many chemists.
3. A chemist can lead over one or many projects
4. A project can have only one project leader chemist.
5. A project can be done in 1 or many laboratories.
6. A laboratory can host 0 or 1 projects.
7. A laboratory can have 1 or many equipments.
8. An Equipment can be in 1 or 0 laboratories.
9. A chemist can have 0 or many types of equipments.
10. An Equipment can have 0 or 1 chemist at a time
Notations:
PK=Primary Key:
A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number
FK=Foreign Key:
A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables. It acts as a cross-reference between tables because it references the primary key of another table, thereby establishing a link between them
Composite key:
A composite key is a combination of two or more columns in a table that can be used to uniquely identify each row in the table when the columns are combined uniqueness is guaranteed, but when it is taken individually it does not guarantee uniqueness
