China
Africa
Explore chapters and articles related to this topic
Hydronic Distribution Equipment and Systems
Published in T. Agami Reddy, Jan F. Kreider, Peter S. Curtiss, Ari Rabl, Heating and Cooling of Buildings, 2016
T. Agami Reddy, Jan F. Kreider, Peter S. Curtiss, Ari Rabl
In Chapter 11 (Section 11.2), the three generic types of secondary systems were described. Hydronic (also called all-water) systems were historically the first type to evolve, followed by all-air systems (discussed in Chapter 19), and then by air–water systems (discussed in Chapter 20). In recent years, new secondary systems designs have been developed, which modify air–water systems into hybrid systems so as to improve energy efficiency and enhance indoor air quality (also addressed in Chapter 20). Hydronic systems are those wherein the space cooling (or heating) function is performed by chilled water (or hot water) circulated from a central cooling plant (or boiler plant) to heat exchangers or terminal units located in, or immediately adjacent to, the conditioned space. Heat is finally transferred to the room air either by natural convection or forced convection via fans or blowers. Water is an excellent medium to transport heat. It has high specific heat, which is nontoxic, inexpensive, and readily available. It is an energy-efficient transport medium for heat at varying temperature levels by altering the pressure as well as for coolth (with addition of antifreeze such as glycol if temperatures lower than freezing are required).
Special Systems
Published in Carl Bozzuto, Boiler Operator's Handbook, 2021
Much of this book addresses the steam generating boiler plant. While much of what is covered applies to water heating as well, there are many considerations in a water plant that are not a concern in a steam plant. Hydronic is just a word used to differentiate low pressure hot water heating systems from other types of boiler plants. Unlike a steam plant, a hydronic system can be shut down without admitting air to prevent a vacuum. For that one reason, hydronic systems should last at least twice as long as a steam system under otherwise equal operating conditions. How long is that? About 60 years.
HVAC Basics and Indoor Air Quality
Published in Ed Bas, Indoor Air Quality, 2020
All-water systems transfer heat from water to the surrounding area, generally using radiators, baseboards or piping underneath the floor, or placed behind walls or ceilings-also known as hydronic heating. Pipes carrying water require much less space than air ductwork; more maintenance, however, is involved in these systems. Leaking pipes are more noticeable than leaking air ducts. Additionally, ventilation needs must be treated separately; air has to be somehow moved into and out of a space whether or not the heating and cooling demands of the space require it.
Interface heat transfer for hydronic heating: heating tests of concrete blocks and numerical simulations
Published in Experimental Heat Transfer, 2023
Gang Lei, Teng Li, Omid Habibzadeh-Bigdarvish, Xinbao Yu
Hydronic heating has been widely used for various structures to meet the heating demand, such as hydronic floor heating systems for buildings [10–12] and hydronic pavements/bridges for snow/ice melting [13, 14]. Hydronic heating consists of hydronic pipes with heat transfer carrier fluid and heat is transferred from the pipe to the host structures, including concrete walls, pavements, and bridge slabs. Currently, existing hydronic heating designs are primarily employed for new structures where hydronic loops, which are considered internal heating, are embedded in the concrete during construction [14–16]. An alternative external hydronic heating system has been gradually developed in recent years, especially for bridge deck deicing, in which hydronic loops are attached to the bottom of the bridge deck and encapsulated in a layer of spray foam to heat existing bridge decks under severe winter events [13, 17–19].
Above-floor tube-and-plate radiant floor model development and validation
Published in Journal of Building Performance Simulation, 2018
S.A. Brideau, I. Beausoleil-Morrison, M. Kummert
Hydronic radiant floor heating and cooling have the advantage of using milder water temperatures than other types of heating or cooling systems. Energy savings can result from these milder water temperatures because the heating (or cooling) generation equipment can usually perform more efficiently and because low-temperature solar systems can be utilized. Additionally, radiant floors allow for milder air temperatures to be maintained in the space while maintaining acceptable comfort levels. To be able to accurately predict the performance of hydronic radiant floor systems, accurate models are required.