getingintohotwater_fsec29oct

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Getting into hot water with solar water heating :

Getting into hot water with solar water heating Florida Solar Energy Center Open House October 29, 2005 John Harrison

Solar water heating: What exactly is this technology? :

Solar water heating: What exactly is this technology? Uses a solar collector to heat water instead of electricity Uses a water heater tank to store the heated water and provide back-up Not a new technology Has been used for decades throughout the United States and internationally

How does it work? :

How does it work? Solar systems always have a collection method and a storage method Flow Control Plus a few other components such as standard valves

System Types :

System Types Variety of system types are available in Florida Passive required no pumps and control method Active Pump and controller are used to circulate water through the collector Direct and indirect systems

What type of system would I use in my area? :

What type of system would I use in my area? Variety of systems available Each has unique characteristics Freeze potential

Warm climates :

Warm climates Fluid in tank is heated in collector Most common system in temperate climates

Cold climates :

Cold climates Freeze protection Reduce Scale Non-potable fluids

System Types :

System Types Passive systems Integral Collector Storage Batch, Breadbox Thermosiphon Active systems Circulates water from a storage tank via a pump through the solar collector Based on collector and controller type

System types - Passive :

System types - Passive Passive Systems Unit serves as both collector and storage medium No pumps, controllers, or other moving parts Very simple, effective, and reliable Extension of the plumbing system

ICS System :

ICS System 4” diameter copper tubes, glass and film glazing, aluminum body, side and back insulation.

ICS System :

ICS System Basic valves: Drain By-Pass & Isolation

ICS System Plumbing :

ICS System Plumbing

Batch - Breadbox :

Batch - Breadbox Do it yourself unit. Enclose some type of tank in a frame, add insulation and a cover.

System Types - Passive :

System Types - Passive Thermosiphon system Solar collector and storage tank are both on the roof Roof mounted tank can also incorporate a heating element Or, thermosiphon system on roof is connected to conventional auxiliary tank in residence Very popular system internationally

Thermosiphon System :

Thermosiphon System Uses flat plate solar collector and solar storage tank. It does not have pumps, controllers, or any moving parts. Water is heated and the density of the hot versus cold water takes over from there. Works off natural thermosiphon actions in moving the water heated in the collector back to the tank and the cold water in the tank to the collecto

Thermosiphon System :

Thermosiphon System

Thermosiphon System Plumbing :

Thermosiphon System Plumbing

System Types - Active :

System Types - Active Active systems Flat plate collector Storage tank below collector Control method Regulates when pump moves water through the collectors to gain heat Variety of other valves

Slide 23:

Flat plate solar collector Glass, metal enclosure, inner insulation, absorber plate or fins, copper tubing.

Differential Controller System Plumbing :

Differential Controller System Plumbing

Differential Controller System :

Differential Controller System Controller and wiring Pump Valves Plumbing to collector

Slide 26:

Drainback system Storage and drainback tanks In this system all the water in the collector drains back into a reservoir.

Indirect Heat Exchanger :

Indirect Heat Exchanger Indirect system with heat exchanger that contains fluids in collector that do not freeze. Heat exchanger is external to the water heater.

Slide 28:

Indirect system Indirect system with heat exchanger that contains fluids in collector that do not freeze. Heat exchanger is in the water heater.

PV Controlled System :

PV PV Controlled System Photovoltaic panel produces electricity to power a small direct current pump. This circulates water through the solar collector when the sun is out.

PV Controlled System :

DC pump PV Controlled System

PV Controlled System Plumbing :

PV Controlled System Plumbing

Timer Controlled System :

Timer operated (9 am to 5 pm) Special valve for bottom feed – bottom return Timer Controlled System

Timer System Plumbing :

Timer System Plumbing

How do I determine how much hot water I use – in order to size a system? :

How do I determine how much hot water I use – in order to size a system? (Or, use this rule of thumb: 20 gallons for the house and then 10 gallons for each person. For example: 4 people would use 60 gallons.)

How do I determine how much energy (in Btus and kWh) will be required for heating the amount of hot water I use? :

How do I determine how much energy (in Btus and kWh) will be required for heating the amount of hot water I use? Use the following calculation: 8.24 x Gallons used x Temperature rise (Set point of tank minus the local cold water temp) x Stand-by heat loss of tank For a family of 5: 8.24 x 85 x 44 x 1.12 = 34,516 Btus per day To determine kWhs, divide Btus by 3413 34,516 ?3413 = 10.1 kWh per day Or, 303 kWh per month That equals (at $.12 per kWh) $36 per month - $432 per year A system with an 80% Solar Fraction would save approximately $29 per month - $345 per year A system would have to be chosen that provides the required Btus. Use the FSEC Simplified Sizing Procedure.