Check into hotel, motel, resort high-tech designs: HVAC and sustainable buildings/energy efficiency

Hotels, motels, and resorts accommodate thousands of people. Here, engineers explain just how challenging it is to deliver unique design concepts and ensure these structures are in compliance specifically in regards to HVAC and sustainable buildings/energy efficiency.

05/24/2017


Respondents (left to right): John Barrot, Kevin Christensen, Wesley S. Lawson, Steven Mulcahy, and Christine Sauer

Respondents

  • John Barrot, PE, LEED AP, Associate Principal, Arup, New York City
  • Kevin Christensen, PE, LEED AP, Vice President/Director of MEP Engineering, Epstein, Chicago
  • Wesley S. Lawson, PE, Senior Associate, Bala Consulting Engineers, King of Prussia, Pa.
  • Steven Mulcahy, Principal Engineer, Southland Engineering, Las Vegas
  • Christine Sauer, PE, Senior Fire Protection Engineer, JENSEN HUGHES, Baltimore

CSE: What unique HVAC requirements do hotel, motel, and resort projects have that you wouldn’t encounter in other buildings?

Christensen: Besides the compliance with energy codes, the greatest challenge can be the physical space available to run ductwork and piping. For the hospitality market, the feeling of the space is a critical component to the architectural design. Open and airy spaces are generally the design norm. This usually translates to higher ceiling heights, which very often can create almost unworkable plenum space.

Lawson: Hotels normally have a different level of acoustical requirements than multifamily buildings. Many times, this will drive the HVAC system selection. The entire design team must be careful not to select a lower-end HVAC system that requires more attenuation, as it may drive the cost to equal that of a higher-level HVAC system with less attenuation. An example of this would be having a heat pump system with attenuation as opposed to a fan coil system.

Mulcahy: The interesting thing about Las Vegas is the perpetual change. Rarely does a week go by that I am not hit with a unique design challenge. The desire by properties to outdo each other leads to each project being unique in some way.

CSE: Have you specified variable refrigerant flow (VRF) systems, chilled beams, or other types of HVAC systems into a hotel, motel, or resort? If so, describe its challenges and solutions.

Lawson: Bala has seen VRF as a very good system to use in hotel applications. VRF allows for minimal acoustical concerns, the localization of maintenance (no compressors in the room), and the flexibility of using a small unit in each room. Owners have largely been happy with this system when used. Chilled beams are not a great application for a hotel, especially if the owner wants operable windows. It is very important to control the façade, therefore the humidity, in any chilled-beam application.

The Rittenhouse Hotel in Philadelphia is a five-star property for which Bala Consulting Engineers was engaged to assist on renovation when it changed owners in 2012. The hotel features 116 rooms and suites, a spa, a restaurant, meeting rooms, and other features. Courtesy: Bala Consulting EngineersMulcahy: We incorporate chilled beams and/or chilled floors in our projects where appropriate. Dew point and chilled-water-supply temperatures are always a consideration for those types of systems.

Christensen: I have been involved with teams that have proposed these types of systems, but they usually are not approved by the owner for three main reasons: (1) They do not want to deviate from their established standards/guidelines; (2) it sets up a completely new O&M protocol that is different than all the other facilities; and (3) the individual managing the project on the owner side does not want to risk their facility being the first one to deviate from the standards. This is generally true for larger established hotel/motel operators. I would think there would be a greater possibility to convince upstart or one-off operators to install these systems.

CSE: What types of dedicated outside-air systems (DOAS) are owners and facility managers requesting to keep their facility air fresh?

Lawson: Bala has had good success using constant-volume DOAS systems in hotels. The constant-volume system allows for constant air exchange to keep the air fresh within the building. The constant exhaust in the bathrooms also helps mitigate the buildup of humidity in the rooms from long showers. The energy code often drives these types of systems to have energy-recovery capabilities as well.

CSE: What types of air balancing or environmental balancing do you include in your design? Describe the project.

Mulcahy: Air balancing is required by our local energy code. All projects require it.

CSE: When designing a hotel, motel, or resort with a pool or spa facilities, what unique HVAC, humidity, and air-balancing issues must you address?

Lawson: The biggest concern of any pool or spa space is humidity control. Not only how to control the humidity within the space, but how to keep the humidity from transferring to adjacent spaces. The HVAC system equipment always requires local control within the pool and spa spaces. There also is a large set of obstacles when these pool and spa spaces are located along an exterior wall. Great care needs to be taken to treat the façade to mitigate condensation, especially during the colder months.


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