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