Introduction
The air-cooled mini chillers form part of a complete integrated water hydronic system with the
chiller water fan coil units. The range of capacity from 30,000 Btu/hr to 150,000 Btu/hr (8.79 –
43.96 KW) makes them suitable for various applications:
- Office Rooms
- Private Houses
- Business Rooms
- Club, Pubs, Coffee Houses
- Hotels
- Restaurants
- Process Cooling
The advantages of using these chillers are:
1. Due to its compact design, the mini-chillers require a smaller space for installation.
The design also allows for flexibility in design to meet various types of application
requirements.
2. The amount of refrigerant used is small compared with other split and multi-split direct
expansion systems, i.e. they are more environmental friendly.
3. There is no necessity to use cooling towers.
4. No refrigerant is used in the occupied space.
5. The usage of water as the cooling medium allows for excellent load variability with minimal
system complexity as against equivalent VRV systems.
6. Ability to have long piping distances.
A water hydronic system can be classified as a close
or open system.
Definition
: A close water system is one with no more than one point of interface with a
compressible gas or surface. [ASHRAE handbook: 1996 System & Equip.]
The basic design of the mini-chiller is for a close system. However, a modification for an open
system is possible.
The close hydronic system will consist of the following fundamental components:
a. Source
b. Load
c. Expansion Tank
d. Pump
e. Distribution System
Introduction Page 1
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