7-15 Parker Street

Killam Properties Inc
100 solar panels
Domestic Hot Water Preheat
Thermo Dynamics Ltd – G Series (4x8ft)
Panel location: 
Roof mounted
7-15 Parker Street
Dartmouth, NS


The diagram below shows the schematic of the Solar Hot Water System installed at 7-15 Parker Street in Dartmouth.

The 100 roof mounted panels are shown above.  Heating fluid - diluted Propylene-Glycol - flows through two parallel arrays simultaneously, each array having 50 panels and an independent circulator. Within each array there are sub-groups plumbed in series, and each sub-group contains 5 panels plumbed in parallel. 

The heated glycol (Red) returns from each array and mixes with the domestic water supply through a set of three heat exchangers in series. Once the collected heat is transferred from glycol to water, the glycol is then split and circulated back out to the arrays.

The blue line in the centre of the figure labeled "COLD SUPPLY" illustrates the city supply water entering the system. Prior to this installation, the cold supply water would have been entirely heated by the existing boiler. The pre-heated water is stored in 20 x 100 US Gallon storage tanks. The water in these tanks is circulated through the six heat exchangers when there is solar-heat to be extracted from the glycol. The thick red line leaving these tanks marked "SOLAR PREHEATED SUPPLY" is the solar preheated water on its way to the boiler.

The overall temperature difference of the water entering and leaving the system is shown as T1 and T2 respectively. The difference between these two temperatures is the heat added by the system.

The volume of Domestic Hot Water used is monitored every minute, and accumulated over the course of each day and month. The minutely flow is labeled as “Flow”.  On average, this building uses about 17,000 L of hot water every day.

Knowing the temperature difference between T1 and T2 every minute and the volume of water used each minute, one can calculate the amount of energy provided by the system in Kilowatt hours, and also the amount of heating oil saved by the building. T3 is the temperature of the water leaving the oil-fired boiler.

All data being collected, the daily and monthly accumulations of flow, the total energy produced, heating oil saved, and the CO2 offset are posted live to this image every sixty seconds.

  • Commercial Solar