Case study 1
Dirac House, Cambridge

     This system combines unitary heat pumps (Versatemp) with a CRISTOPIA eutectic store. Recovered heat or cooling that goes into the water circuit can be stored for use at times of maximum demand. The central plant consists of a CRISTOPIA Thermal store and two air-to-water heat pumps for supplementary heating or cooling. The STL coped with 95% of the prevailing heating and cooling loads with the central heat pumps used only for " topping up ". When this building is compared with a conventional air conditioned office a saving of 48 kg/m2 of CO2 is achieved.
     Source : BRECSU. General information leaflet 24. All-electric, air conditioned office uses heat pump technology, 1994.

Case study 2
Bangsar DC plant (Malaysia)

 

	Without STL	Without STL	STL
Refrigerant	R 123	R 134a	R 123
Charge (kg)	9 220	16 700	5 020
GWP	90	1 200	90
CO2 equivalent (Tons)	830	20 040	452
Consumption (GWh)	33	35	30.8
CO2/kWh	0.55	0.55	0.55
CO2 equivalent (Tons)	18 150	19 250	16 940
Total CO2 per year (Tons)	18 980	39 290	17 392

Case study 3
Harp Brewery, Dundalk, Ireland

     This installation uses CRISTOPIA eutectic salts at -10°C (SN10 nodules). The STL meets 25 % of the total cooling requirement and peak lops by nearly 50%. The system efficiency has improved from operating the compressors under steady state conditions and from the temperature increases of the LT and HT circuits by 5°C and that the overall electric power consumption is now lower by 24%.
     Source : HADDESLEY. Harp tunes-up cooling. Refrigeration and air conditioning, January, 1996.

Case study 4
Waterside Shopping Centre, Lincoln

     Waterside shopping centre, Lincoln building fabric designed to lower heating, cooling costs. The system uses a STL-S-00 with heat pumps, due to practically all year round cooling requirements. Ice is made overnight by the heat pumps reset from their daytime temperature to supply the water/glycol solution at -5°C. Low grade heat is recovered by the heat pump condensers and use to pre-heat the building and aids fabric protection. The STL supplies the base load and the chillers are used as a top up, as there is a very predictable load usage. The STL is charged to 100% each night.
     Source : Waterside turns to ice. Heating and Air conditioning, January 1992.