Claims
- 1. A HVAC system for providing conditioned air to a space, comprising:
- a precool coil
- a direct expansion coil
- a first temperature sensing means adapted to measure temperature in said space and produce first temperature data;
- a compressor adapted to provide a cooling agent to said direct expansion coil;
- a water tower for producing cooled water;
- a second temperature sensing means adapted to measure the temperature of said cooled water and produce second temperature data;
- a condenser adapted to receive cooling agent which has been heated by said direct exchange coil and cooled water from said water tower, said condenser producing recooled cooling agent and warmed water;
- a valve operably connecting said precool coil with said condenser and said water tower for controlling the source of water to said precool coil;
- a temperature selection means adapted to produce a desired temperature signal representative of a desired temperature for the space; and
- a programmable controller in communication with said first and second temperature sensing means, said temperature selection means and said valve and being adapted to compute a cooling load as a function of said first and second temperature data and said desired temperature signal, said controller further calculating the percentage of cooling load to a predetermined cooling capacity, said controller causing said valve to supply heated water to said precool coil when said percentage is below a predetermined percentage.
Parent Case Info
This application is a division of application Ser. No. 07/526,857 filed May 21, 1990, now U.S. Pat. No. 5,101,639.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
2167878 |
Crawford |
Aug 1939 |
|
4271678 |
Libert |
Jun 1981 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
526857 |
May 1990 |
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