The Importance of Integrating Heating and Cooling Systems in Large Facilities

In most big buildings, heating and cooling operate quite independently of each other. While the boiler gets to work in winter, the air con takes up the slack in summer, and nobody worries that these two systems are potentially at cross-purposes for most of the year. Because they are. When a building chills and heats separately with no systems talking to each other it’s all too easy for one to heat one area while the other is cooling the space next door. The result is wastage on a colossal scale, and when your building is more than a few floors high, far more than you might imagine.

Why hybrid systems need specialist attention

Most massive buildings and factories aren’t going to rip out a functional heating or cooling plant just because it’s no longer the latest technology. The only way the rapid transition to more renewable commercial heating and cooling can work is by using what we already have while we ramp up replacement with the latest sustainable alternative. In practice, that means working systems will continue to operate after a commercial heat pump upgrade is installed.

Given the huge strides in commercial air and water source heat pump performance and falling costs, it’s unlikely those old gas boilers will be firing for long most days. But they do need to be there to kick in when the heat pump can’t quite maintain set point. Ironically, worst case scenario – when the most heating is needed – is also when electrical power generation is least carbon intensive and most likely to be coming from renewable sources.

This kind of staged upgrade, rather than full replacement, is a key to keeping costs down while still getting serious emissions reductions. For facilities in the ACT region working through this kind of transition, Boiler Heat Pump Services Canberra covers the full scope of commercial hybrid installations, from initial design through to scheduled servicing of combined systems.

Pressure in hydronic systems is one example. Pooling two separate flows from sources like a gas-fired hydronic boiler and an electric heat pump might seem simple enough, but get the balance wrong and one system can drive the other. That puts pressure on bearings, resulting in suboptimal performance and early failure. Clean, safe heat pump operation needs a clean, safe boiler system too.

The case for treating thermal management as a system

Business air conditioning serves to a greater extent than the personal comfort of your staff. In vast facilities like warehouses, hospitals, commercial office towers, or universities, both heating and cooling are systems that operate in silos. They each do their own thing and respond solely to their local inputs. An integrated approach puts both under a unified control framework, typically a Building Management System that’s configuring them in harmony.

For instance, if a heating system is independent and sees it’s 18°C inside everything’s fine. It’s worked no harder to reach this target temperature than if it’s 8°C outside in winter or 28°C in summer because it can’t see that. It’s simply met the thermostat’s condition. But what if that heat source has built-in demand due to a nearby source of heat gain? It’s now running unnecessarily and, in the case of gas, pouring cash down the flue. The first problem is somewhere above 18°C and growing uncomfortably hotter due to this second heat source inappropriately meeting its load. The second problem is running on despite the first thermostat being satisfied because it’s being demanded by the nearby heat gain. This second case is the server room/thermostat scenario.

Heat pumps as the integration layer

Heat pumps are the enabler of building-level electrification. Replacing on-site fossil fuel use with electricity is the first necessary step to achieving a carbon-neutral building. Heat pumps do this more efficiently than electric resistance heat and often save money over time. Systems can be air source, ground source (geothermal), or water source. The coefficient of performance (COP) can be as high as 5-6, meaning for every 1 unit of electricity consumed to power the heat pump, 5-6 units of heating or cooling are produced. They’re applicable to systems from small PTACs up to an entire building’s HVAC.

Integration as a prerequisite for smart building performance

There is a limit to how intelligent a building can become if its fundamental systems do not communicate. The kind of AI-enabled energy optimization that’s out of the lab and becoming a standard service commercially now, requires precise, real-time knowledge of thermal conditions right across a facility. Unifying your heating and cooling under a BMS, which serves as a single version of the truth for the operation of your HVAC, does more than contribute to cutting emissions.

Optimization systems can only be as intelligent and responsive as their inputs. If your commercial heating system and your data center cooling configuration are being run independently, with independent records of what’s been turned on, what’s been running, what’s been adjusted, and when and why, it’s impossible to gather and act on the fine-grained data that optimization engines depend on.

Facilities that are counted as best practice and most desirable in the mid-2020s, for example, are the ones in which the heating and cooling are no longer just looked at this way, as one system: they’re also the ones that, for the entirety of the previous decade, have been operating as a single system for the purposes of determining, measuring, and verifying heat and thermal management.