S13 -- Hydronic Heating and Cooling System Design (SI)

Water systems can be either once-through or recirculating systems. This chapter describes forced recirculating systems. Successful water system design depends on awareness of the many complex interrelationships between various elements. In a practical sense, no component can be selected without considering its effect on the other elements. For example, design water temperature and flow rates are interrelated, as are the system layout and pump selection. The type and control of heat exchangers used affect the flow rate and pump selection, and the pump selection and distribution affect the controllability. The designer must thus work back and forth between tentative points and their effects until a satisfactory integrated design has been reached. Because of these relation-ships, rules of thumb usually do not lead to a satisfactory design.

Chapter Table of Contents

Temperature Classifications
CLOSED WATER SYSTEMS
Method of Design
Thermal Components
Hydraulic Components
Piping Circuits
Capacity Control of Load System
Low-Temperature Heating Systems
Chilled-Water Systems
Dual-Temperature Systems
Other Design Considerations
Other Design Procedures
Antifreeze Solutions
No. of Pages: 26
S14, Condenser Water Systems

As part of the vapor-compression cycle for mechanical refrigeration, the heat of compression produced must be rejected to complete the refrigeration cycle. Refrigerant systems may be cooled by air or water. In water-cooled systems, water flows through the condenser and is called condenser water. Condenser water systems are classified as (1) once-through systems (e.g., city water, well-water, or lake/groundwater systems), or (2) recirculating or cooling tower systems.

Once-Through City Water Systems
Open Cooling Tower Systems
Low-Temperature (Water Economizer) Systems
Closed-Circuit Evaporative Coolers
Overpressure Caused by Thermal Fluid Expansion

ISBN: 978-1-936504-26-8 (for SI versions of chapters)
ISSN: 1930-7705 (for SI versions of chapters)

Citation: 2012 ASHRAE Handbook -- Systems and Equipment: Chapter 13, Hydronic Heating and Cooling System Design



Product Code(s): D-S132012SI