william shady pe –president - cabrillo collegesmurphy/pacific solar radiant- spr09.pdf · pacific...

Pacific Solar Radiant Inc. Santa Cruz Ca

Integrated Solar Radiant Systems

• William Shady PE –President

• Topics

– Radiant heating

– Indoor air quality

– Radiant Cooling

– Project Photos

– Questions and answers


The goal for our clients

“Healthy Comfort”


Why Radiant Heating ?

Benefits

A properly designed and installed radiant panel heating system

offers many advantages over other heating methods.

1. Radiant panel heating improves comfort by increasing a

room's average surface temperature.

A large portion of our body's heat loss is by radiation to cooler

surfaces surrounding us. The cooler these surfaces are, the

faster

they pull heat from us and the more uncomfortable we feel.


Heat loss in humans


Why Radiant Heating?

Benefits

2. Radiant panel heating allows comfort at lower air

temperatures.

Most people engaged in light activity will be very

comfortable in radiantly heated rooms with air temperatures

in the mid 60°F range. If the activity level is greater, light

shop work for example, comfort is often maintained with air

temperatures in the low 60°F range.



Benefits3. Radiant panel heating provides an almost ideal match to

human thermal comfort requirements.

The ideal temperature variation consists of slightly warmer

at foot level, around 70°F at chest level and cooler at the ceiling.


Human comfort levels



Benefits

4. Radiant panel heating reduces or, in some cases,

eliminates room temperature stratification.

It improves comfort and reduces heat transfer through

the ceiling and upper portions of the wall. It also

reduces stack effect air leakage from the building.



Benefits

5. Many radiant panel heating systems are totally out of

sight.

Whether constructed with hydronic tubing, electric cables

or flat heaters, heated floors, walls and ceilings conceal

their function as heat emitters. There are usually less

constraints imposed on furniture placement.



Benefits

6. Radiant heating systems are easily zoned.

Many radiant panel heating systems, both hydronic and

electric, are designed for room-by-room zoning. This

offers energy savings by reducing temperature in

unoccupied rooms. It also allows different occupants to

adjust rooms to their own desired comfort level. And it

helps to prevent localized overheating due to solar or

other types of internal heat gain.



Benefits

7. Radiant heating systems create gentle room air circulation.

In most cases the air motion is so slow that it is not detectable by occupants. Central forced-air systems, by contrast, often create very noticeable whole-building air circulation. The latter tends to distribute dust, odors and airborne viruses throughout the entire building. Some central forced-air systems also pressurize rooms as they operate, increasing air leakage and wasting energy.



Benefits

8. Hydronic and electric distribution systems supplying radiant panels are easily and unobtrusively routed through buildings.

The small tubing, electrical cables or flat heaters supplying radiant heating panels are easily concealed within the building's structural cavities. By contrast, air ducts of equivalent heat carrying ability often require careful planning and structural alterations if they are to be totally concealed.


Area requirements



Benefits

9. Radiant heat systems with high thermal mass, such as

heated concrete slabs, can respond quickly to increased

loads, and absorb passive solar gain.

Many heat delivery systems, such as forced air and

hydronic baseboard, have low thermal mass. This limits

the rate of heat output to the heating capacity of their heat

source. By contrast, a heated floor slab with its large

reservoir of heat can release a burst of heat when needed.



Benefits

10. Radiant heating systems with low thermal mass, such as

electric ceiling panels, release heat almost instantly when

turned on.

Quick heat gives an almost instantaneous improvement in

the thermal comfort of a cool room. Although the objects

and air in the room will require some time to warm, radiant

heat loss from the body is reduced within a couple of

minutes of turning on the low mass panel.



Benefits

11. Heated floors dry quickly.

Dry floors improve safety and provide much better

working conditions than wet floors. It is a tremendous

benefit in auto service garages, fire stations and other

vehicle service facilities.



Benefits

12. Many types of radiant panels are very resistant to

physical damage.

Panels encased in concrete floors are very resistant to

damage from heavy interior traffic. Likewise, heated

ceilings are not likely to be damaged by normal building

usage.



Benefits

13. Radiant heating panels can operate with virtually no

noise.

Properly designed and installed systems eliminate

expansion noise, sheet metal vibration, or velocity noises

caused by fast moving air. Attention to detail during

installation is crucial to achieving a quiet distribution

system.



Benefits

14. Low-temperature hydronic radiant panels are adaptable to

almost any type of heat source and fuel.

Low-temperature heat from solar collectors, geothermal

heat pumps or waste heat recovery systems can often be

utilized for radiant heating. Such heat is only marginally

suitable for other types of delivery systems.


Radiant is a

“Heat Distribution” System

heat

source

Gas

Propane

Oil

Electricity

GeothermalWood burning

Solar



Benefits

15. Electric radiant heating panels are easily operated by

renewable sources.

Low-voltage electric heating panels may be directly

connected to solar panels or wind generators, and line

voltage electric panels on the grid may also get their power

from solar panels or wind generators.



Benefits

16. Radiant panel heating reduces energy consumption.

• Since comfort is maintained at lower air temperatures, the

heating load associated with air exchange is reduced. The

greater the heating load due to air exchange, whether by

natural leakage or forced ventilation, the greater the energy

savings.

• Easy room-by-room zoning control allows unoccupied

spaces to be reduced in temperature, reducing total heating

load.



Benefits

• 16. Radiant panel heating reduces energy consumption.

• Eliminating the layer of warm air normally present against a ceiling's lower surface reduces conductive heat loss.

• Low water temperatures improve boiler efficiency and reduce heat loss from distribution piping in some hydronic radiant panel systems.

• The electrical energy consumption of small circulators used in hydronic radiant panel systems is usually lower than blowers in forced-air systems of similar heating capacity.

• Electric radiant panel systems are 100% efficient because all electrical losses go to heating.


Manifold detail


Radiant Cooling


Dew point control


Ceiling Radiant Panel


Chilled Beam Panels


Indoor Air Quality


Uponor


Iuliano Residence

2007 Innovation Award from the Radiant Panel Association, Hartford Connecticut.

6700 SF single story home in Soquel

• Structural slab insulated underneath complete slab and edges

• ½” Barrier Pex tied 12” on center

• 9000 feet of tubing in 13 zones

• Solar hot water system heats domestic water, radiant floors and swimming pool shell


Early Morning Start


Concrete Pour over Tubing


Swimming pool radiant


Gunnite tubing into shell


Finished pool


Mechanical System components

• Modulating boiler as primary heat source

• 80 evacuated tube solar collectors

• 200 gallons of solar hot water for space heat

• 120 gallons of preheated domestic hot water

• 120 gallons of domestic hot water by boiler

• Pool and spa heater 20 gallons heat

exchanger


Innovations

• Solar hot water to goes to pool in summer

when no radiant floor heating is needed

• One single pump circulates hot water to the

radiant floors using a variable speed motor

to save energy.

• Solar hot water is stored and used for

radiant floors and domestic hot water.


Mechanical Room


Solar collectors


Solar Collectors


Swimming pool radiant


Climate Right Systems


Additional resources

• Radiant Panel Association

– www.radiantpanelassociation.org

• Pacific Solar Radiant Inc.

– www.pacificsolaradiant.com

william shady pe –president - cabrillo collegesmurphy/pacific solar radiant- spr09.pdf · pacific...

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