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UNIT 4: ENVIRONMENT MANAGEMENT SYSTEMS
101
• A thermostatic radio valve fitted onto a radiator and used in
conjunction with the room thermostat system or boiler energy control
system; it works by reducing water flow into the radiator when the
thermostat reaches the set temperature;
• Storage water controls, used for storage or combination heaters:
they include such features as automatic thermostats (to control
heat storage and output according to peak demand loads and
tariffs windows), convector-control room temperature thermostats, and
external timers.
Good Practice Tip
A complete heating and cooling control package can usually be installed at
any time, but installation costs can be substantially reduced if it is done during
refurbishment.
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Double-Glazing
Based on energy savings alone, the pay-back time for double-glazing replacement
windows is 4 to 7 years. The most important feature in reducing heat loss is not the
thickness of the glass, but the space between the layers of glass, which should be
around 20mm. Low-emissivity glass will further reduce heat loss.
Good Practice Tips
In the case of windows already installed, secondary glazing usually made of
glass in plastic or aluminium frames is a cost-effective option. Wood and PVC
frames are better insulators than aluminium.
Trickle vents to ensure adequate ventilation should accompany replacement
windows.
Sealing and Stripping
Badly fitted doors and windows are a major source of heating and cooling loss, but
are cheap and easy to repair. Sealing and stripping materials include silicon strips,
blade seals, brush piles and fillers, and rubber, PVC and aluminium seals.
Good Practice Tip
It is especially important to maintain adequate ventilation where flued (fuel and
gas) appliances are in use, since adequate air must keep entering the area to
allow fires to burn safely. If trickle vents are not fitted, the upper part of windows
should not be sealed.
Controlled Ventilation
While sealing and stripping is important, so too is controlled ventilation. Adequate
ventilation is important to reduce condensation and the resulting damp, and to
ensure that odours, carbon dioxide and stale air are removed and good indoor air
quality is maintained. There are several types of controlled ventilation suitable for
hospitality buildings: