CASE STUDIES
Salisbury Hospital Breast Care Unit goes dual purpose with its chiller with heat recovery
Klima-Therm has installed an innovative high effi ciency heat pump chiller, developed by Rhoss in conjunction with Padua University, at Salisbury District Hospital’s Breast Care Unit.
T
he Rhoss model THAITY 117 system has a dual-purpose coil enabling it to be used as a water chiller during summer and water heater during winter. Linked to a compact Rhoss air handling unit (AHU), it delivers up to 16kW of cooling and 18kW of heating.
The packaged reversible DX heat pump is equipped with a heat recovery system based on a compact brazed plate heat exchanger for effi ciency.
In cooling mode, the water coil operates at a temperature of 6°C, and in heating mode at 45°C. Fine control is provided by inverter-controlled scroll compressors and EC fans, which enable capacity to be turned down in small increments to 25% of maximum output.
The unit’s adaptive control system continually monitors and evaluates the system’s thermal inertia in relation to set point and current load. The trend in water temperature is assessed
72 January 2018
against the fl uctuating load, and parameters adjusted dynamically in real time. As a result of the combined heat recovery system, inverter control and intelligent adaptive control logic, energy effi ciency is very high, with an ESEER in cooling mode of 5.1.
The system overcomes the need to install a separate boiler and associated pipework, with just a simple connection required between the packaged heat pump and AHU.
It does not require refrigerant pipework to be installed within the building, overcoming any potential F-Gas concerns. Refrigerant charge (R410A) is extremely small, avoiding the mandatory requirement to carry out frequent system tests and reporting under F-Gas Regulations, thereby reducing ongoing maintenance costs.
Klima-Therm’s Andrew Latus, who headed the project, said: “Given the sensitive hospital
location, noise was also an important issue. The system operates with very low noise levels due to the modulating compressors and fans, which under inverter control match output precisely to current load. As a result, the system operates at part-load for much of the time.”
When load requirements are low and there is a need for even quieter operation, such as at night- time, it is possible to limit noise levels to a pre- set level using an optional FDL accessory. Paired with the Rhoss compact AHU, the heat pump system is linked to the existing Building Management System and caters for all of the building’s thermal requirements. Using a three- way diverter valve, the system can also be used to generate domestic hot water.
Klima-Therm designed, supplied and installed the system, locating the AHU in an existing roof- top plant room and linking to the heat pump with connecting pipe work.
www.acr-news.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84
