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Hot Water Supply Systems
Published in Fred Hall, Roger Greeno, Building Services Handbook, 2017
Controls Temperature and pressure-relief valve.Expansion/pressure-relief valve.Cylinder temperature regulating thermostat manually set to operate the zone valve at 60-65°C.Over-temperature cut-out thermostat, pre-set to operate the zone valve at 85°C.
HOT WATER SUPPLY SYSTEMS
Published in Fred Hall, Roger Greeno, Building Services Handbook, 2011
Temperature and pressure relief valve. Expansion/pressure relief valve. Cylinder temperature regulating thermostat manually set to operate the zone valve at 6065C. Over-temperature cut out thermostat, pre-set to operate the zone valve at 85C.
Integrated model for comparison of one- and two-pipe ground-coupled heat pump network configurations
Published in Science and Technology for the Built Environment, 2018
Laurent Gagné-Boisvert, Michel Bernier
Table 1 presents a summary of the basic components required in each network as presented by Kavanaugh and Rafferty (2014), Mescher (2009) and Taylor and Stein (2002). This selection may differ depending on the designer. Hose kits are assumed to be installed on each heat pump. They are positioned between connections 11 and 12 for two-pipe systems (Figures 1a and 1b) and between connections 6 and 7 for one-pipe systems (Figure 1c). An on/off control valve (often called a zone valve) is required (as shown between 12–13 in Figures 1a and 1b) at each heat pump in two-pipe networks to stop the flow when the heat pump is not operating. Direct-return systems need a balancing valve for each unit to allow the right flow to be supplied in each different hydraulic path (14–11 in Figure 1b). It is also common practice to install ball valves to isolate each heat pump branch from the primary pipe. However, as presented in Figure 1c, one-pipe networks require only one ball valve (1–5) since a check valve is added (7–8; Mescher 2009).
Identification of multi-zone grey-box building models for use in model predictive control
Published in Journal of Building Performance Simulation, 2020
Javier Arroyo, Fred Spiessens, Lieve Helsen
The BOPTEST interface can interact with the emulator model from an external controller by overwriting a set of predefined signals. In this emulator, the signals that are accessible to the external controller are the opening of the valves, and the desired mass-flow-rate of the pump, as explained in Section 3.2. A considerable effort is required to translate the optimized heat inputs into the signals sent to the plant actuators. For this purpose, the outputs of the optimization are post-processed in a subcontroller to provide the heat requested in each zone. Specifically, the pump is switched on/off to work at its nominal value when heat is requested and a PI controller in each zone valve tracks the heat input computed by the MPC.
Effects of controls and floor construction of radiant floor heating systems for residential application with high variability of solar gains
Published in Science and Technology for the Built Environment, 2020
Sébastien A. Brideau, Ian Beausoleil-Morrison, Michaël Kummert
With ON-OFF controls, the supply temperature to the radiant floor is constant (supply temperature discussed in the Parametric Analysis Section). A thermostat turns a pump (or a zone valve) on or off based on the zone air